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Kouokam JC, Speer RM, Meaza I, Toyoda JH, Lu H, Wise JP. Transcriptomic analysis reveals particulate hexavalent chromium regulates key inflammatory pathways in human lung fibroblasts as a possible mechanism of carcinogenesis. Toxicol Appl Pharmacol 2024; 485:116889. [PMID: 38479592 DOI: 10.1016/j.taap.2024.116889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 03/04/2024] [Accepted: 03/07/2024] [Indexed: 03/22/2024]
Abstract
Hexavalent chromium [Cr(VI)] is considered a major environmental health concern and lung carcinogen. However, the exact mechanism by which Cr(VI) causes lung cancer in humans remains unclear. Since several reports have demonstrated a role for inflammation in Cr(VI) toxicity, the present study aimed to apply transcriptomics to examine the global mRNA expression in human lung fibroblasts after acute (24 h) or prolonged (72 and 120 h) exposure to 0.1, 0.2 and 0.3 μg/cm2 zinc chromate, with a particular emphasis on inflammatory pathways. The results showed Cr(VI) affected the expression of multiple genes and these effects varied according to Cr(VI) concentration and exposure time. Bioinformatic analysis of RNA-Seq data based on the Gene ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG) and MetaCore databases revealed multiple inflammatory pathways were affected by Cr(VI) treatment. qRT-PCR data corroborated RNA-Seq findings. This study showed for the first time that Cr(VI) regulates key inflammatory pathways in human lung fibroblasts, providing novel insights into the mechanisms by which Cr(VI) causes lung cancer.
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Affiliation(s)
- J Calvin Kouokam
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston St, Rm, 1422 Louisville, KY, USA.
| | - Rachel M Speer
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston St, Rm, 1422 Louisville, KY, USA; Current address: Department of Pharmaceutical Sciences, University of New Mexico, Albuquerque, NM 87131, USA
| | - Idoia Meaza
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston St, Rm, 1422 Louisville, KY, USA
| | - Jennifer H Toyoda
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston St, Rm, 1422 Louisville, KY, USA
| | - Haiyan Lu
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston St, Rm, 1422 Louisville, KY, USA
| | - John Pierce Wise
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston St, Rm, 1422 Louisville, KY, USA
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2
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Cui T, Yan S, Ding Y, Lin S, Chen Q, Hou Y, Ding L, Wang H, Xu R. Chromium immobilization from wastewater via iron-modified hydrochar: Different iron fabricants and practicality assessment. Ecotoxicol Environ Saf 2024; 274:116132. [PMID: 38471342 DOI: 10.1016/j.ecoenv.2024.116132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 02/06/2024] [Accepted: 02/18/2024] [Indexed: 03/14/2024]
Abstract
The recycling of industrial solid by-products such as red mud (RM) has become an urgent priority, due to their large quantities and lack of reutilization methods can lead to resource wastage. In this work, RM was employed to fabricate green hydrochar (HC) to prepare zero-valent iron (ZVI) modified carbonous materials, and conventional iron salts (IS, FeCl3) was applied as comparison, fabricated HC labeled as RM/HC and IS/HC, respectively. The physicochemical properties of these HC were comprehensively characterized. Further, hexavalent chromium (Cr(VI)) removal performance was assessed (375.66 and 337.19 mg/g for RM/HC and IS/HC, respectively). The influence of dosage and initial pH were evaluated, while isotherms, kinetics, and thermodynamics analysis were also conducted, to mimic the surface interactions. The stability and recyclability of adsorbents also verified, while the practical feasibility was assessed by bok choy-planting experiment. This work revealed that RM can be used as a high value and green fabricant for HC the effective removal of chromium contaminants from the wastewater.
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Affiliation(s)
- Ting Cui
- School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China
| | - Song Yan
- Agency on Rural Energy Management of Yunnan Province, Kunming 650500, China
| | - Yu Ding
- Rural Energy Workstation of Baoshan City, Baoshan 678000, China
| | - Shaopeng Lin
- Rural Energy Workstation of Baoshan City, Baoshan 678000, China
| | - Qiuliang Chen
- Rural Energy Workstation of Honghe City, Honghe 661000, China
| | - Ying Hou
- Agricultural Environmental Protection and Rural Energy Workstation of Luoping, Qvjing 655800, China
| | - Lin Ding
- National-Local Joint Engineering Research Center for Heavy Metal Pollutant Control and Resource Utilization, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Huabin Wang
- School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China; Agency on Rural Energy Management of Yunnan Province, Kunming 650500, China.
| | - Rui Xu
- School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China; Agency on Rural Energy Management of Yunnan Province, Kunming 650500, China.
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Meaza I, Williams AR, Lu H, Kouokam JC, Toyoda JH, Croom-Perez TJ, Wise SS, Aboueissa AEM, Wise JP. Prolonged particulate hexavalent chromium exposure induces RAD51 foci inhibition and cytoplasmic accumulation in immortalized and primary human lung bronchial epithelial cells. Toxicol Appl Pharmacol 2023; 479:116711. [PMID: 37805091 PMCID: PMC10841504 DOI: 10.1016/j.taap.2023.116711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 10/04/2023] [Accepted: 10/04/2023] [Indexed: 10/09/2023]
Abstract
Hexavalent chromium [Cr(VI)] is a human lung carcinogen with widespread exposure risks. Cr(VI) causes DNA double strand breaks that if unrepaired, progress into chromosomal instability (CIN), a key driving outcome in Cr(VI)-induced tumors. The ability of Cr(VI) to cause DNA breaks and inhibit repair is poorly understood in human lung epithelial cells, which are extremely relevant since pathology data show Cr(VI)-induced tumors originate from bronchial epithelial cells. In the present study, we considered immortalized and primary human bronchial epithelial cells. Cells were treated with zinc chromate at concentrations ranging 0.05 to 0.4μg/cm2 for acute (24 h) and prolonged (120 h) exposures. DNA double strand breaks (DSBs) were measured by neutral comet assay and the status of homologous recombination repair, the main pathway to fix Cr(VI)-induced DSBs, was measured by RAD51 foci formation with immunofluorescence, RAD51 localization with confocal microscopy and sister chromatid exchanges. We found acute and prolonged Cr(VI) exposure induced DSBs. Acute exposure induced homologous recombination repair, but prolonged exposure inhibited it resulting in chromosome instability in immortalized and primary human bronchial epithelial cells.
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Affiliation(s)
- Idoia Meaza
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston Street, Building 55A, Room 1422, Louisville, KY 40292, United States of America
| | - Aggie R Williams
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston Street, Building 55A, Room 1422, Louisville, KY 40292, United States of America
| | - Haiyan Lu
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston Street, Building 55A, Room 1422, Louisville, KY 40292, United States of America
| | - J Calvin Kouokam
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston Street, Building 55A, Room 1422, Louisville, KY 40292, United States of America
| | - Jennifer H Toyoda
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston Street, Building 55A, Room 1422, Louisville, KY 40292, United States of America
| | - Tayler J Croom-Perez
- Burnett School of Biomedical Sciences, University of Central Florida College of Medicine, 6900 Lake Nona Blvd., Orlando, FL 32827, United States of America
| | - Sandra S Wise
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston Street, Building 55A, Room 1422, Louisville, KY 40292, United States of America
| | | | - John Pierce Wise
- Wise Laboratory of Environmental and Genetic Toxicology, Department of Pharmacology and Toxicology, University of Louisville, 500 S Preston Street, Building 55A, Room 1422, Louisville, KY 40292, United States of America.
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Yin CM, Niu RG, Wang H, Li XY, Zeng QF, Lan JF. Symbiotic hemolymph bacteria reduce hexavalent chromium to protect the host from chromium toxicity in Procambarus clarkii. J Hazard Mater 2023; 459:132257. [PMID: 37572611 DOI: 10.1016/j.jhazmat.2023.132257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 08/02/2023] [Accepted: 08/07/2023] [Indexed: 08/14/2023]
Abstract
Hexavalent chromium (Cr(VI)) is a cytotoxic heavy metal pollutant that adversely affects all life forms. Interestingly, the crustacean Procambarus clarkii exhibits a relatively high tolerance to heavy metals. The underlying mechanisms remain unclear. In this study, we investigated the role of symbiotic bacteria in P. clarkii in alleviating Cr(VI)-induced damage and explored their potential mechanisms of action. Through transcriptomic analysis, we observed that Cr(VI) activated P. clarkii's antimicrobial immune responses and altered the bacterial composition in the hemolymph. After antibiotic treatment to reduce bacterial populations, Cr(VI)-induced intestinal and liver damage worsened, and crayfish exhibited lower levels of GSH/CAT/SOD activity. The Exiguobacterium, the symbiotic bacteria in the hemolymph of P. clarkii, were proved to be primary contributor to Cr(VI) tolerance. Further investigation suggested that it resists Cr(VI) through the activation of the ABC transporter system and the reduction of Cr(VI) via the reductase gene nfsA. To validate the role of Exiguobacterium in Cr(VI) tolerance, crayfish treated with antibiotics then supplemented with Exiguobacterium H6 and recombinant E. coli (with the nfsA gene), reduced Cr(VI)-induced ovarian damage. Overall, this study revealed that the symbiotic bacteria Exiguobacterium can absorb and reduce hexavalent chromium, mitigating Cr(VI)-induced damage in P. clarkii. These findings provide new insights into hexavalent chromium tolerance mechanisms in crustaceans.
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Affiliation(s)
- Cheng-Ming Yin
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Taian 271018, China
| | - Rui-Geng Niu
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Taian 271018, China
| | - Hui Wang
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Taian 271018, China
| | - Xian-Yao Li
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Taian 271018, China
| | - Qi-Fan Zeng
- MOE Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences/Key Laboratory of Tropical Aquatic Germplasm of Hainan Province, Sanya Oceanographic Institution, Ocean University of China, Qingdao, Sanya, China.
| | - Jiang-Feng Lan
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Taian 271018, China.
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Wise SS, Lu H, Speer RM, Wise JP, Young J, Toyoda JH, Meaza I, Croom-Perez TJ, Kouokam JC, Specht A, Liu KJ, Hoyle GW, Wise JP. Chromium distribution in an oropharyngeal aspiration model for hexavalent chromium in rats. Toxicol Appl Pharmacol 2022; 457:116294. [PMID: 36283442 PMCID: PMC10121970 DOI: 10.1016/j.taap.2022.116294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 10/05/2022] [Accepted: 10/19/2022] [Indexed: 11/06/2022]
Abstract
Hexavalent chromium [Cr(VI)] is a well-known and widespread environmental contaminant associated with a variety of adverse health effects, in particular lung cancer. The primary route of exposure in humans is through inhalation. Particulate forms of Cr(VI) are the most potent but in vivo studies are difficult. Intratracheal instillation requires highly trained surgical procedures which also limits the number of repeated exposures possible and thus requires high doses. Inhalation studies can deliver lower more chronic doses but are expensive and generate dangerous aerosols. We evaluated an oropharyngeal aspiration exposure route for zinc chromate particles in Wistar rats. Animals were treated once per week for 90 days. We found chromium accumulated in the lungs, blood, and reproductive tissues of all treated animals. Additionally, we found inflammatory indicators in the lung were elevated and circulating lymphocytes had increased chromosomal damage. These results show oropharyngeal aspiration provides a practicable exposure route for chronic and sub-chronic exposures of Cr(VI) particles.
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Affiliation(s)
- Sandra S Wise
- Wise Laboratory of Environmental and Genetic Toxicology, University of Louisville, 500 S. Preston St, HSC55A Rm 1422, United States of America; Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY, United States of America
| | - Haiyan Lu
- Wise Laboratory of Environmental and Genetic Toxicology, University of Louisville, 500 S. Preston St, HSC55A Rm 1422, United States of America; Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY, United States of America
| | - Rachel M Speer
- Wise Laboratory of Environmental and Genetic Toxicology, University of Louisville, 500 S. Preston St, HSC55A Rm 1422, United States of America; Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY, United States of America; Department of Pharmaceutical Sciences, University of New Mexico, Albuquerque, NM, United States of America
| | - John Pierce Wise
- Pediatric Research Institute, Department of Pediatrics, University of Louisville, Louisville, KY, United States of America
| | - Jamie Young
- Wise Laboratory of Environmental and Genetic Toxicology, University of Louisville, 500 S. Preston St, HSC55A Rm 1422, United States of America; Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY, United States of America
| | - Jennifer H Toyoda
- Wise Laboratory of Environmental and Genetic Toxicology, University of Louisville, 500 S. Preston St, HSC55A Rm 1422, United States of America; Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY, United States of America
| | - Idoia Meaza
- Wise Laboratory of Environmental and Genetic Toxicology, University of Louisville, 500 S. Preston St, HSC55A Rm 1422, United States of America; Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY, United States of America
| | - Tayler J Croom-Perez
- Wise Laboratory of Environmental and Genetic Toxicology, University of Louisville, 500 S. Preston St, HSC55A Rm 1422, United States of America; Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY, United States of America
| | - J Calvin Kouokam
- Wise Laboratory of Environmental and Genetic Toxicology, University of Louisville, 500 S. Preston St, HSC55A Rm 1422, United States of America; Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY, United States of America
| | - Aaron Specht
- School of Health Sciences, Purdue University, West Lafayette, IN, United States of America
| | - Ke Jian Liu
- Department of Pharmaceutical Sciences, University of New Mexico, Albuquerque, NM, United States of America
| | - Gary W Hoyle
- Department of Environmental and Occupational Health, School of Public Health and Information Sciences University of Louisville, Louisville, KY, United States of America
| | - John Pierce Wise
- Wise Laboratory of Environmental and Genetic Toxicology, University of Louisville, 500 S. Preston St, HSC55A Rm 1422, United States of America; Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY, United States of America.
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Metropulos AE, Becker JH, Principe DR. Chromium (VI) promotes lung cancer initiation by activating EGF/ALDH1A1 signalling. Clin Transl Discov 2022; 2:e155. [PMID: 37396570 PMCID: PMC10312984 DOI: 10.1002/ctd2.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Accepted: 11/21/2022] [Indexed: 07/04/2023]
Abstract
Lung cancer is the leading cause of cancer-related death worldwide and is strongly associated with tobacco smoke exposure. Though smoking remains the most important and best studied risk factor, recent data suggests that several other carcinogens have a driving role in lung cancer development, particularly in select populations at risk of high or prolonged exposure. Hexavalent chromium [Cr(VI)] is a known carcinogen that is widely used in the manufacturing industry. While the link between Cr(VI) and lung cancer incidence is well-accepted, the mechanisms through which Cr(VI) promotes lung cancer development are poorly understood. In the present study by Ge and colleagues published in Clinical and Translational Medicine, the authors explored the effects of prolonged Cr(VI) on non-malignant lung epithelial cells. They determined that Cr(VI) initiates lung tumorigenesis by transforming a subpopulation of stem-like, tumor initiating cells with increased expression of Aldehyde dehydrogenase 1 family member A1 (ALDH1A1). The observed increase in ALDH1A1 was dependent on transcriptional upregulation via Krüppel-like factor 4 (KLF4), and associated with enhanced Epidermal Growth Factor (EGF) biosynthesis. Cr(VI)-transformed tumor initiating cells accelerated tumor formation in vivo, which was ameliorated by therapeutic inhibition of ALDH1A1. Importantly, ALDH1A1 inhibition also sensitized Cr(VI)-driven tumors to Gemcitabine chemotherapy and extended overall survival in mice. This study not only offers novel insight into the mechanisms through which Cr(VI) exposure initiates lung tumorigenesis, but identifies a potential therapeutic target for patients with lung cancer secondary to Cr(VI) exposure. Additionally, this study underscores the importance of limiting exposure to Cr(VI) in the workplace and finding safer alternatives for use in the manufacturing industry.
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Affiliation(s)
| | - Jeffrey H. Becker
- Department of Surgery, University of Illinois at Chicago, Chicago, IL USA
| | - Daniel R. Principe
- Medical Scientist Training Program, University of Illinois College of Medicine, Chicago, IL USA
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Zhao Y, Zhang H, Hao D, Wang J, Zhu R, Liu W, Liu C. Selenium regulates the mitogen-activated protein kinase pathway to protect broilers from hexavalent chromium-induced kidney dysfunction and apoptosis. Ecotoxicol Environ Saf 2022; 239:113629. [PMID: 35576799 DOI: 10.1016/j.ecoenv.2022.113629] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 03/27/2022] [Accepted: 05/08/2022] [Indexed: 06/15/2023]
Abstract
Hexavalent chromium [Cr (VI)] is a common environmental pollutant. Although selenium (Se) can antagonize the toxicity of Cr (VI), the specific underlying mechanism has not been identified. To investigate this mechanism, we used potassium dichromate (K2Cr2O7) and selenium-rich yeast (SeY) to construct single Cr (VI)- and combined Se/Cr (VI)-exposed broiler models during a 42-day period. Broilers were randomly assigned to the control (C), SeY (Se), SeY + Cr (VI) (Se/Cr), and Cr (VI) (Cr) groups. The antagonistic mechanisms of Se and Cr (VI) were evaluated using histopathological evaluation, serum and tissue biochemical tests, real-time fluorescence quantitative polymerase chain reaction, and western blotting. The results suggested that Se alleviated the morphological and structural damage to renal tubules and glomeruli, while reducing the organ index, creatinine levels, and blood urea nitrogen levels in the kidneys of Cr (VI)-exposed broilers. Furthermore, Cr (VI) reduced the levels of superoxide dismutase and glutathione, and increased the levels of malondialdehyde, in broiler kidney tissues. However, Se alleviated Cr (VI)-induced oxidative stress by increasing the levels of superoxide dismutase and glutathione, and decreasing the levels of malondialdehyde, within a certain range. Compared to the C group, the levels of p38, JNK, p-p38, p-JNK, p-p38/p38, and p-JNK/JNK significantly increased, whereas those of ERK, p-ERK, and p-ERK/ERK decreased, in the Cr group. Compared to the Cr group, the levels of p38, JNK, p-p38, p-JNK, p-p38/p38, and p-JNK/JNK significantly decreased, whereas those of ERK, p-ERK, and p-ERK/ERK increased, in the Se/Cr group. Furthermore, the levels of p53, c-Myc, Bax, Cyt-c, caspase-9, and caspase-3 significantly increased, and those of Bcl-2 and Bcl-2/Bax significantly decreased, following Cr (VI) exposure, while Se restored the expression of these genes. In conclusion, our findings suggest that SeY can protect against Cr (VI)-induced dysfunction and apoptosis by regulating the mitogen-activated protein kinase pathway activated by oxidative stress in broiler kidney tissues.
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Affiliation(s)
- Yanbing Zhao
- Shanxi Key Lab for Modernization of TCVM, College of Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, Shanxi, PR China
| | - Huan Zhang
- Shanxi Key Lab for Modernization of TCVM, College of Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, Shanxi, PR China
| | - Dezheng Hao
- Shanxi Key Lab for Modernization of TCVM, College of Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, Shanxi, PR China
| | - Jingqiu Wang
- Shanxi Key Lab for Modernization of TCVM, College of Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, Shanxi, PR China
| | - Ruixin Zhu
- Shanxi Key Lab for Modernization of TCVM, College of Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, Shanxi, PR China
| | - Weina Liu
- Shanxi Key Lab for Modernization of TCVM, College of Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, Shanxi, PR China
| | - Ci Liu
- Shanxi Key Lab for Modernization of TCVM, College of Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, Shanxi, PR China.
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Yao Y, Liu X, Hu H, Tang Y, Hu H, Ma Z, Wang S. Synthesis and characterization of iron-nitrogen-doped biochar catalysts for organic pollutant removal and hexavalent chromium reduction. J Colloid Interface Sci 2021; 610:334-346. [PMID: 34923271 DOI: 10.1016/j.jcis.2021.11.187] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 11/27/2021] [Accepted: 11/29/2021] [Indexed: 12/23/2022]
Abstract
Fe, N atoms deposited on porous biochar (Fe-N@BC) composites were synthesized and employed as an efficient catalyst for organic pollutant removal and CrVI reduction. Naturally abundant, renewable and N-rich pomelo peel as a carbon and nitrogen source and unsubstituted phthalocyanine/iron phthalocyanine complexes as a Fe and nitrogen resource were used to develop the Fe-N@BC via a carbonization process. It is found that Fe-N@BC hybrids have homogeneous dispersion of Fe and N atoms on 3D hierarchically porous biochar, which significantly improves the performance toward the detoxification of organic pollutants using peroxymonosulfate as an oxidant, as well as the reduction of hexavalent chromium by formic acid as a reductant. Furthermore, the effects of Fe loading and pyrolytic temperature on catalysis were comprehensively analyzed and optimized. The excellent activity of Fe-N@BC in acid media can be attributed to the high dispersion of Fe species, high content of doped nitrogen as well as hierarchical micro-mesopores, which induce to expose more active sites for catalysis. Owing to the structure-enabled acidic stability, Fe-N@BC efficiently retains its activity as well as its structural stability after several cycles of reactions. This work provides a new approach to construct Fe, N-doped biochar as an effective catalyst for the detoxification of organic and inorganic pollutants.
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Affiliation(s)
- Yunjin Yao
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei 230009, China.
| | - Xiaoyan Liu
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei 230009, China
| | - Huanhuan Hu
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei 230009, China
| | - Yinghao Tang
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei 230009, China
| | - Hongwei Hu
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei 230009, China
| | - Zhenshan Ma
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei 230009, China
| | - Shaobin Wang
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia.
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Dabhade A, Jayaraman S, Paramasivan B. Development of glucose oxidase-chitosan immobilized paper biosensor using screen-printed electrode for amperometric detection of Cr(VI) in water. 3 Biotech 2021; 11:183. [PMID: 33927974 PMCID: PMC7982374 DOI: 10.1007/s13205-021-02736-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Accepted: 03/10/2021] [Indexed: 12/14/2022] Open
Abstract
Hexavalent chromium is a toxic heavy metal getting discharged into the environment and water bodies through various industrial processes. Conventional analysis methods call for expensive equipment and complicated sample pretreatment that made unsuitable for onsite detection. Paper is used as an enzyme immobilization platform because of its property to wick the liquid by capillary action; lightweight, cheap and can be easily patterned or cut according to the requirements for developing biosensor. In this study, enzyme immobilization of glucose oxidase (GOx) on filter paper were examined using three polysaccharides such as chitosan, sodium alginate and dextran for entrapment efficiency, activity and stability of the immobilized enzyme. Among the three, chitosan proved efficient for enzyme entrapment with about 90% efficiency at 0.3% (w/v) chitosan. The stability was checked after 1 week at 4 °C and room temperature, where the chitosan entrapped enzyme retained nearly 97% stability at 4 °C. Enzyme inhibition study of GOx and Cr(VI) was carried out using chronoamperometry shown uncompetitive type of inhibition. A paper-based electrochemical biosensor strip was developed by immobilizing GOx enzyme on filter paper using chitosan as an entrapping agent and associating it with a screen-printed carbon electrode for amperometric measurements. The linear range of detection was obtained as 0.05-1 ppm with the limit of detection as 0.05 ppm for Cr(VI), which is the standard permissible limit in potable water. The relative standard deviation (5.6%) indicates good reproducibility of the fabricated biosensor.
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Affiliation(s)
- Ajinkya Dabhade
- Agricultural and Environmental Biotechnology Group, Department of Biotechnology and Medical Engineering, National Institute of Technology Rourkela, Rourkela, Odisha 769008 India
| | - Sivaraman Jayaraman
- Medical Electronics and Instrumentation Group, Department of Biotechnology and Medical Engineering, National Institute of Technology Rourkela, Rourkela, Odisha 769008 India
| | - Balasubramanian Paramasivan
- Agricultural and Environmental Biotechnology Group, Department of Biotechnology and Medical Engineering, National Institute of Technology Rourkela, Rourkela, Odisha 769008 India
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Coyte RM, McKinley KL, Jiang S, Karr J, Dwyer GS, Keyworth AJ, Davis CC, Kondash AJ, Vengosh A. Occurrence and distribution of hexavalent chromium in groundwater from North Carolina, USA. Sci Total Environ 2020; 711:135135. [PMID: 32000345 DOI: 10.1016/j.scitotenv.2019.135135] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 10/03/2019] [Accepted: 10/21/2019] [Indexed: 06/10/2023]
Abstract
Hexavalent chromium (Cr(VI)) is a groundwater contaminant that is potentially harmful to human health. Understanding the occurrence of Cr(VI) in groundwater resources is critical for evaluating its risks to human health. Here we report a large dataset (n = 1362) of Cr(VI) and total chromium (CrT) concentrations in public, private, and monitoring wells from different aquifers across North Carolina. These water quality data come from new and previous measurements conducted at Duke University, as well as data reported by the U.S. Environmental Protection Agency, the N.C. Department of Environmental Quality, and the U.S. Geological Survey. The data confirm that Cr(VI) is the predominant species of dissolved Cr and that groundwater from aquifers in the Piedmont region contain significantly higher concentrations than groundwater from the coastal plain. Though there is only one exceedance of the U.S. EPA Maximum Contaminant Level (100 µg/L for CrT) in the dataset, over half of all wells measured for Cr(VI) (470 out of 865) in the dataset exceeded the N.C. Health Advisory Level of 0.07 µg/L. Using information from this dataset, we explore three different approaches to predicting Cr(VI) in groundwater: (1) CrT concentrations as a proxy for Cr(VI); (2) Exceedance probabilities of health goals for groundwater from aquifers located in specific geologic areas; and (3) Censored linear regression using commonly measured field parameters (pH, electrical conductivity, dissolved oxygen) with relationships to Cr(VI) as regressors. Combining these approaches, we have identified several areas in the Piedmont region where Cr(VI) in drinking water wells is expected to be higher than the advisory level, which coincide with large population groundwater reliant populations. While this study focuses on N.C., the wide-spread occurrence of Cr(VI) in groundwater at concentrations above health guidelines in aquifers of the Piedmont region could pose high human health risks to large populations in the eastern U.S.
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Affiliation(s)
- Rachel M Coyte
- Nicholas School of the Environment, Duke University, Durham, NC 27708, United States
| | - Kristen L McKinley
- Nicholas School of the Environment, Duke University, Durham, NC 27708, United States
| | - Sheng Jiang
- Department of Statistical Science, Duke University, Durham, NC 27708, United States
| | - Jonathan Karr
- Nicholas School of the Environment, Duke University, Durham, NC 27708, United States
| | - Gary S Dwyer
- Nicholas School of the Environment, Duke University, Durham, NC 27708, United States
| | - Amy J Keyworth
- Department of Environmental Services, Wake County Government, Raleigh, NC 27602, United States
| | - Christina C Davis
- North Carolina Department of Environment and Natural Resources (NC DENR), Division of Water Quality, 2728 Capital Boulevard, Raleigh, NC 27604, United States
| | - Andrew J Kondash
- Nicholas School of the Environment, Duke University, Durham, NC 27708, United States
| | - Avner Vengosh
- Nicholas School of the Environment, Duke University, Durham, NC 27708, United States.
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KEANE M, SIERT A, STONE S, CHEN B, SLAVEN J, CUMPSTON A, ANTONINI J. Selecting Processes to Minimize Hexavalent Chromium from Stainless Steel Welding: Eight welding processes/shielding gas combinations were assessed for generation of hexavalent chromium in stainless steel welding fumes. Weld J 2012; 91:241s-246s. [PMID: 26690276 PMCID: PMC4681305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
UNLABELLED Eight welding processes/shielding gas combinations were assessed for generation of hexavalent chromium (Cr6+) in stainless steel welding fumes. The processes examined were gas metal arc welding (GMAW) (axial spray, short circuit, and pulsed spray modes), flux cored arc welding (FCAW), and shielded metal arc welding (SMAW). The Cr6+ fractions were measured in the fumes; fume generation rates, Cr6+ generation rates, and Cr6+ generation rates per unit mass of welding wire were determined. A limited controlled comparison study was done in a welding shop including SMAW, FCAW, and three GMAW methods. The processes studied were compared for costs, including relative labor costs. Results indicate the Cr6+ in the fume varied widely, from a low of 2800 to a high of 34,000 ppm. Generation rates of Cr6+ ranged from 69 to 7800 μg/min, and Cr6+ generation rates per unit of wire ranged from 1 to 270 μg/g. The results of field study were similar to the findings in the laboratory. The Cr6+ (ppm) in the fume did not necessarily correlate with the Cr6+ generation rate. Physical properties were similar for the processes, with mass median aerodynamic diameters ranging from 250 to 336 nm, while the FCAW and SMAW fumes were larger (360 and 670 nm, respectively). CONCLUSION The pulsed axial spray method was the best choice of the processes studied based on minimal fume generation, minimal Cr6+ generation, and cost per weld. This method is usable in any position, has a high metal deposition rate, and is relatively simple to learn and use.
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Affiliation(s)
- M. KEANE
- National Institute for Occupational Safety and Health (NIOSH), Health Effects Laboratory Div., Morgantown, W.Va
| | | | - S. STONE
- National Institute for Occupational Safety and Health (NIOSH), Health Effects Laboratory Div., Morgantown, W.Va
| | - B. CHEN
- National Institute for Occupational Safety and Health (NIOSH), Health Effects Laboratory Div., Morgantown, W.Va
| | - J. SLAVEN
- NIOSH and Indiana University, Indianapolis, Ind
| | - A. CUMPSTON
- National Institute for Occupational Safety and Health (NIOSH), Health Effects Laboratory Div., Morgantown, W.Va
| | - J. ANTONINI
- National Institute for Occupational Safety and Health (NIOSH), Health Effects Laboratory Div., Morgantown, W.Va
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