1
|
Nakakubo K, Biswas FB, Taniguchi T, Endo M, Sakai Y, Wong KH, Mashio AS, Nishimura T, Maeda K, Hasegawa H. Insight into stability of dithiocarbamate-modified adsorbents: Oxidation of dithiocarbamate. Chemosphere 2023; 343:140216. [PMID: 37748655 DOI: 10.1016/j.chemosphere.2023.140216] [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: 08/01/2023] [Revised: 09/16/2023] [Accepted: 09/18/2023] [Indexed: 09/27/2023]
Abstract
We previously reported that monoalkyl dithiocarbamate-modified cellulose (DMC) exhibited excellent adsorption performance for arsenite (AsIII), cadmium (CdII), lead (PbII), gold (AuIII), silver (AgI), platinum (PtIV), and palladium (PdII). However, its adsorption capability for AsIII decreased by 96.4% after two weeks of storage at 40 °C under an air atmosphere. This decrease in adsorption ability could occur for other metals that dithiocarbamates can extract. In this study, we investigated the adsorption performance of DMC for various metals before and after storage and proposed a possible mechanism for this decrease. We found significant decreases in the adsorption abilities of PbII (11.4%), AgI (39.5%), PtIV (65.5%), and PdII (69.6%), whereas AuIII and CdII adsorption was largely retained, with decreases of 1.1% and 4.0%, respectively. FTIR analysis of the stored DMC revealed the formation of S-S bonds and the retention of dithiocarbamate peaks, indicating the formation of dithiocarbamate dimers (thiuram disulfides). To further support thiuram disulfide formation, dialkyl thiuram disulfides were tested for the adsorption of the seven employed metals. The metal adsorption behavior of dialkyl thiuram disulfides was almost identical to that of the stored adsorbent, ensuring thiuram disulfide formation. In conclusion, the loss of adsorption capability can be mainly attributable to the formation of thiuram disulfide.
Collapse
Affiliation(s)
- Keisuke Nakakubo
- National Institute of Advanced Industrial Science and Technology (AIST), Department of Energy and Environment, Environmental Management Research Institute, 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan.
| | - Foni B Biswas
- Department of Chemistry, Faculty of Science, University of Chittagong, Chattogram, 4331, Bangladesh
| | - Tsuyoshi Taniguchi
- Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan
| | - Masaru Endo
- Daicel Corporation, 1239 Shinzaike, Aboshi-ku, Himeji-Shi, Hyogo, 671-1283, Japan
| | - Yuto Sakai
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan
| | - Kuo H Wong
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan
| | - Asami S Mashio
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan
| | - Tatsuya Nishimura
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan
| | - Katsuhiro Maeda
- Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan
| | - Hiroshi Hasegawa
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan.
| |
Collapse
|
2
|
Vrinda PK, Amal R, Abhirami N, Mini DA, Kumar VJR, Devipriya SP. Co-exposure of microplastics and heavy metals in the marine environment and remediation techniques: a comprehensive review. Environ Sci Pollut Res Int 2023; 30:114822-114843. [PMID: 37922080 DOI: 10.1007/s11356-023-30679-2] [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: 07/14/2023] [Accepted: 10/21/2023] [Indexed: 11/05/2023]
Abstract
Microplastics (MPs) and heavy metals are significant pollutants in the marine environment, necessitating effective remediation strategies to prevent their release into the sea through sewage and industrial effluent. This comprehensive review explores the current understanding of the co-exposure of MPs and heavy metal-enriched MPs, highlighting the need for effective remediation methods. Various mechanisms, including surface ion complexation, hydrogen bonding, and electrostatic forces, contribute to the adsorption of heavy metals onto MPs, with factors like surface area and environmental exposure duration playing crucial roles. Additionally, biofilm formation on MPs alters their chemical properties, influencing metal adsorption behaviors. Different thermodynamic models are used to explain the adsorption mechanisms of heavy metals on MPs. The adsorption process is influenced by various factors, including the morphological characteristics of MPs, their adsorption capacity, and environmental conditions. Additionally, the desorption of heavy metals from MPs has implications for their bioavailability and poses risks to marine organisms, emphasizing the importance of source reduction and remedial measures. Hybrid approaches that combine both conventional and modern technologies show promise for the efficient removal of MPs and heavy metals from marine environments. This review identifies critical gaps in existing research that should be addressed in future studies including standardized sampling methods to ensure accurate data, further investigation into the specific interactions between MPs and metals, and the development of hybrid technologies at an industrial scale. Overall, this review sheds light on the adsorption and desorption mechanisms of heavy metal-enriched MPs, underscoring the necessity of implementing effective remediation strategies.
Collapse
Affiliation(s)
- Punmoth Kalyadan Vrinda
- Department of Ocean Studies and Marine Biology, Pondicherry University, Port Blair, 744112, Andaman and Nicobar Islands, India
| | - Radhakrishnan Amal
- School of Environmental Studies, Cochin University of Science and Technology, Kochi, India, 682022
| | - Nandakumar Abhirami
- Department of Aquatic Environment Management, Central Institute of Fisheries Education, Versova, Mumbai, Maharashtra, 400061, India
| | - Divya Alex Mini
- Department of Aquatic Environment Management, Kerala University of Fisheries and Ocean Studies, Panangad, Kochi, 682508, Kerala, India
| | | | | |
Collapse
|
3
|
Masoumi H, Ghaemi A, Ghanadzadeh Gilani H. Surveying the elimination of hazardous heavy metal from the multi-component systems using various sorbents: a review. J Environ Health Sci Eng 2022; 20:1047-1087. [PMID: 36406597 PMCID: PMC9672201 DOI: 10.1007/s40201-022-00832-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Accepted: 08/18/2022] [Indexed: 06/16/2023]
Abstract
In this review, several adsorbents were studied for the elimination of heavy metal ions from multi-component wastewaters. These utilized sorbents are mineral materials, microbes, waste materials, and polymers. It was attempted to probe the structure and chemistry characteristics such as surface morphology, main functional groups, participated elements, surface area, and the adsorbent charges by SEM, FTIR, EDX, and BET tests. The uptake efficiency for metal ions, reusability studies, isotherm models, and kinetic relations for recognizing the adsorbent potentials. Besides, the influential factors such as acidity, initial concentration, time, and heat degree were investigated for selecting the optimum operating conditions in each of the adsorbents. According to the results, polymers especially chitosan, have displayed a higher adsorption capacity relative to the other common adsorbents owing to the excellent surface area and more functional groups such as amine, hydroxyl, and carboxyl species. The high surface area generates the possible active sites for trapping the particles, and the more effective functional groups can complex more metal ions from the polluted water. Also, it was observed that the uptake capacity of each metal ion in the multi-component solutions was different because the ionic radii of each metal ion were different, which influence the competition of metal ions for filling the active sites. Finally, the reusability of the polymers was suitable, because they can use several cycles which proves the economic aspect of the polymers as the adsorbent.
Collapse
Affiliation(s)
- Hadiseh Masoumi
- School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, 13114-16846 Iran
| | - Ahad Ghaemi
- School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, 13114-16846 Iran
| | | |
Collapse
|
4
|
Ai S, Qin Y, Hong Y, Liu L, Yu W. Low-temperature aerobic carbonization and activation of cellulosic materials for Pb 2+ removal in water source. Environ Pollut 2022; 314:120215. [PMID: 36150617 DOI: 10.1016/j.envpol.2022.120215] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 06/20/2022] [Revised: 09/04/2022] [Accepted: 09/16/2022] [Indexed: 06/16/2023]
Abstract
Targeting the removal of Pb2+ in wastewater, cellulosic materials were carbonized in an aerobic environment and activated via ion exchange. The maximum adsorption capacity reached 243.5 mg/g on an MCC-derived adsorbent activated with sodium acetate. The modified porous properties improved the adsorption capacity. The capacity could be completely recovered five times through elution with EDTA. Because of the negative effects of Ni, Mg, and Ca elements, the adsorption capacities of activated carbonized natural materials were lower than that of pure cellulose. N2 adsorption measurement showed that the adsorbent had a large specific surface area as well as abundant micropores and 4-nm-sized mesopores. FTIR and surface potential results proved that carboxyl group was generated in the aerobic carbonization, and was deprotonated during ion exchange. This adsorbent consisted of C-C bonds as the building blocks and hydrophilic groups on the surface. XPS results demonstrated that the Pb 4f binding energies were reduced by 0.7-0.8 eV due to the interaction between Pb2+ and the activated adsorbent, indicating that the carboxylate groups bonded with Pb2+ through coordination interactions. Pseudo-second-order and Elovich kinetic models were well fitted with the adsorption processes on the pristine and activated carbonized adsorbents, indicative of chemisorption on heterogeneous surfaces. The Freundlich expression agreed well with the data measured, and the pristine and activated adsorbents had weak and strong affinities for Pb2+, respectively. The Pb2+ adsorption process was exothermic and spontaneous, and heat release determined the spontaneity. The adsorption capacity is attributed to the carboxylate groups and pores generated in the aerobic oxidation and ion exchange procedures.
Collapse
Affiliation(s)
- Shuo Ai
- College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou City, 545006, China.
| | - Yue Qin
- College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou City, 545006, China
| | - Yuxiang Hong
- College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou City, 545006, China
| | - Linghui Liu
- College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou City, 545006, China
| | - Wanguo Yu
- College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou City, 545006, China
| |
Collapse
|
5
|
Wang Z, Jiang H, Zhang Y, Bian K, Wang H, Wang C. Stepwise flotation separation of WEEE plastics by polymeric aluminum chloride towards source control of microplastics. Waste Manag 2022; 149:1-10. [PMID: 35689973 DOI: 10.1016/j.wasman.2022.05.029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 02/22/2022] [Revised: 05/07/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
The mismanagement of waste electrical and electronic equipment (WEEE) resulted in numerous discarded plastics in the natural environment, and these waste plastics might experience aging, breaking, and migration, which becomes a crucial microplastic source. Sustainable management of WEEE plastics presents a considerable opportunity for resource recovery and microplastic pollution prevention. Flotation separation is a significant process of mechanical recycling, while most flotation methods can only deal with binary plastic mixtures. In this work, an advanced, stepwise, and sustainable flotation method was advocated to separate multi-plastics by polymeric aluminum chloride (PAC) modification. The abundant hydrophilic groups and environmental friendliness of PAC prompted us to further investigate the wetting effect. PAC had varied hydrophilization effects on acrylonitrile butadiene styrene (ABS) and polystyrene (PS) surfaces, but polyethylene terephthalate (PET) retained hydrophobicity. Treatment conditions, including PAC dosage, temperature, time, and pH were optimized. 100% of PET could be purified after primary separation, and the purities of ABS and PS could reach 100% and 97.4% after secondary separation, respectively. The strength of the interaction was determined by the different surface potentials and functional groups. In PAC solution, long-chain molecules or ions might interact with plastic surfaces electrostatically, and Al3+ could bridge long-chain molecules and plastic surfaces, thereby strengthening the polymer hydrophilicity. We further improved the PAC treatment process, and the reuse of PAC reduced modifier usage to 84.4 g/ton waste plastics, which was cost-effective in industrial applications. A preliminary evaluation of the energy consumption and environmental impact indicated that PAC treatment was superior to other modification methods. This work is an initial attempt at the stepwise separation of waste plastic and shows promising prospects for recycling plastic waste.
Collapse
Affiliation(s)
- Zhiyi Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China
| | - Hongru Jiang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China
| | - Yingshuang Zhang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China
| | - Kai Bian
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China
| | - Hui Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China.
| | - Chongqing Wang
- School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, PR China.
| |
Collapse
|
6
|
Zhang W, Chen D, Wang X, Xie X. Insight into the synthesis of branched polyethylenimines from 2-haloethylamine via a one-pot two-stage process. POLYMER 2022; 255:125113. [DOI: 10.1016/j.polymer.2022.125113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
7
|
Wan T, He S, Wang T, Wang J, Yu M, Jia Y, Tang Q. Synthesis of polyethylenimine-modified magnetic hydrogel nanocomposite absorbents for heavy metals removal. KOREAN J CHEM ENG 2022. [DOI: 10.1007/s11814-022-1168-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
8
|
Özçoban MŞ, Acarer S. Investigation of the Effect of Leachate on Permeability and Heavy Metal Removal in Soils Improved with Nano Additives. Applied Sciences 2022; 12:6104. [DOI: 10.3390/app12126104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Soils with low permeability are widely used in solid waste landfills to prevent leakage of leachate into groundwater. By adding nanomaterials to clay soils, the permeability of the clay can be reduced as well as the retention of pollutants in the leachate. In this study, three different nanomaterials, iron oxide, aluminum oxide, and Oltu clay, were added to kaolin at two different rates (1% and 5%), and the effect of nanomaterials on permeability and heavy metal (iron, manganese, zinc, copper, and lead) removal rate was investigated. According to the experimental results, permeability decreased, and the heavy metal removal rate increased with increasing nanomaterial content in kaolin. With the addition of 5% iron oxide, 5% aluminum oxide, and 5% Oltu clay to kaolin, the average permeability decreased by 63%, 81%, and 96%, respectively. Iron (90–93%), manganese (47–75%), zinc (39–50%), copper (33–41%), and lead (36–49%) removal rates of nanomaterial-added kaolin samples were found to be higher than the removal rates of kaolin without nanomaterial addition. Oltu clay, which has the smallest size and high surface area, performed better than aluminum oxide and iron oxide in reducing the permeability of kaolin and retaining heavy metals.
Collapse
|
9
|
Hu SZ, Huang T, Zhang N, Lei YZ, Wang Y. Chitosan-assisted MOFs dispersion via covalent bonding interaction toward highly efficient removal of heavy metal ions from wastewater. Carbohydr Polym 2022; 277:118809. [PMID: 34893228 DOI: 10.1016/j.carbpol.2021.118809] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [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: 08/26/2021] [Revised: 10/10/2021] [Accepted: 10/21/2021] [Indexed: 02/05/2023]
Abstract
Metal organic frameworks (MOFs) have been considered to be robust adsorbent for the removing heavy metal ions from wastewater due to their unique properties such as large active sites, high specific surface area and high porosity, etc., however, their practical engineering application faces the problem of serious agglomeration. In this work, a new strategy of chitosan (CS) assisting MOF dispersion was proposed to develop the new generation of MOF-based adsorbents, namely, CS grafted UiO-66-NH2 composite materials (CGUNCM). The UiO-66-NH2 was selected and it was grafted onto the main chains of CS through covalent bonding interaction with the aid of glutaraldehyde, which was totally different from the common method that grafting molecular chains on the surface of MOFs resulting in the dramatic reduction of active adsorption sites. The results show that grafting MOFs onto CS main chains not only greatly improves the dispersion of MOFs but also reserves the morphology of MOFs as much as possible. The adsorption performances toward Cu(II) and Pb(II) were intensively studied by varying adsorbate concentration, ionic strength, the contact time, adsorption temperature and pH value of solution. The results show that the composite adsorbent exhibits high adsorption efficiency and the adsorption equilibrium can be reached within 45 min, and the maximum adsorption capacity toward Cu(II) and Pb(II) achieve 364.96 mg/g and 555.56 mg/g, respectively. Furthermore, the composite adsorbent shows good reusability. This work provides a new method of fabricating the MOF-based adsorbent and paves the way for the practical application of such adsorbents in wastewater treatment.
Collapse
Affiliation(s)
- Shao-Zhong Hu
- School of Materials Science & Engineering, Key Laboratory of Advanced Technologies of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu 610031, China
| | - Ting Huang
- School of Materials Science & Engineering, Key Laboratory of Advanced Technologies of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu 610031, China.
| | - Nan Zhang
- School of Materials Science & Engineering, Key Laboratory of Advanced Technologies of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu 610031, China
| | - Yan-Zhou Lei
- Analytical and Testing Center, Southwest Jiaotong University, Chengdu 610031, China
| | - Yong Wang
- School of Materials Science & Engineering, Key Laboratory of Advanced Technologies of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu 610031, China.
| |
Collapse
|
10
|
Liu Y, Fan H, Wang X, Zhang J, Li W, Wang R. Controllable synthesis of bifunctional corn stalk cellulose as a novel adsorbent for efficient removal of Cu 2+ and Pb 2+ from wastewater. Carbohydr Polym 2022; 276:118763. [PMID: 34823785 DOI: 10.1016/j.carbpol.2021.118763] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [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: 07/20/2021] [Revised: 09/28/2021] [Accepted: 10/06/2021] [Indexed: 01/08/2023]
Abstract
A corn stalk cellulose-based adsorbent with bifunctional groups of -NH-/-NH2 and C-S/C=S for efficient removal of Cu2+ and Pb2+ was successfully synthesized. Under specific alkali and reaction conditions, 4.58 mmol/g of C-S/C=S groups were further introduced on surface of aminated cellulose with 6.99 mmol/g of amino groups. The introduced CS2 would only participate in the esterification with -NH2 groups to form special dithiocarbamate (DTC) structures containing -NH- groups (-NHCS2-). The synthesized DTC structures would not reduce total amount of -NH-/-NH2 groups on aminated cellulose to keep its excellent adsorption performance for Cu2+, and the introduced appropriate number of C-S/C=S groups could ensure the efficient removal of Pb2+. It was suitable for removal of coexisting Cu2+ and Pb2+ with low initial concentration in real wastewater, and the removal rates were both close to 100%. The application of the bifunctional cellulose offered a novel way for purpose of 'waste treatment by waste'.
Collapse
Affiliation(s)
- Yi Liu
- School of Resources, Environmental & Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Environmental Testing Center of Nanchang University, Nanchang 330031, PR China
| | - Hongying Fan
- School of Resources, Environmental & Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Environmental Testing Center of Nanchang University, Nanchang 330031, PR China
| | - Xuan Wang
- School of Resources, Environmental & Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Environmental Testing Center of Nanchang University, Nanchang 330031, PR China
| | - Jian Zhang
- School of Resources, Environmental & Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Environmental Testing Center of Nanchang University, Nanchang 330031, PR China
| | - Wenting Li
- School of Resources, Environmental & Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Environmental Testing Center of Nanchang University, Nanchang 330031, PR China
| | - Rong Wang
- School of Resources, Environmental & Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Environmental Testing Center of Nanchang University, Nanchang 330031, PR China.
| |
Collapse
|
11
|
Saeed AAH, Harun NY, Sufian S, Bilad MR, Nufida BA, Ismail NM, Zakaria ZY, Jagaba AH, Ghaleb AAS, Al-dhawi BNS. Modeling and Optimization of Biochar Based Adsorbent Derived from Kenaf Using Response Surface Methodology on Adsorption of Cd2+. Water 2021; 13:999. [DOI: 10.3390/w13070999] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Cadmium is one of the most hazardous metals in the environment, even when present at very low concentrations. This study reports the systematic development of Kenaf fiber biochar as an adsorbent for the removal of cadmium (Cd) (II) ions from water. The adsorbent development was aided by an optimization tool. Activated biochar was prepared using the physicochemical activation method, consisting of pre-impregnation with NaOH and nitrogen (N2) pyrolysis. The influence of the preparation parameters—namely, chemical impregnation (NaOH: KF), pyrolysis temperature, and pyrolysis time on biochar yield, removal rate, and the adsorption capacity of Cd (II) ions—was investigated. From the experimental data, some quadratic correlation models were developed according to the central composite design. All models demonstrated a good fit with the experimental data. The experimental results revealed that the pyrolysis temperature and heating time were the main factors that affected the yield of biochar and had a positive effect on the Cd (II) ions’ removal rate and adsorption capacity. The impregnation ratio also showed a positive effect on the specific surface area of the biochar, removal rate, and adsorption capacity of cadmium, with a negligible effect on the biochar yield. The optimal biochar-based adsorbent was obtained under the following conditions: 550 °C of pyrolysis temperature, 180 min of heating time, and a 1:1 NaOH impregnation ratio. The optimum adsorbent showed 28.60% biochar yield, 69.82% Cd (II) ions removal, 23.48 mg/g of adsorption capacity, and 160.44 m2/g of biochar-specific area.
Collapse
|
12
|
Sun J, Sun G, Zhao X, Zhao H, Yang Z, Yan L, Jiang X, Cui Y. Efficient removal of Pb( ii) and Cr( vi) from acidic wastewater using porous thiophosphoryl polyethyleneimine. NEW J CHEM 2021. [DOI: 10.1039/d1nj02480a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A porous thiophosphoryl polyethyleneimine was synthesized to remove Pb(ii) and Cr(vi) from acidic wastewater.
Collapse
Affiliation(s)
- Junhua Sun
- School of Chemistry and Chemical Engineering, University of Jinan, No. 336 Nanxinzhuang West Road, 250022 Jinan, P. R. China
| | - Guoxin Sun
- School of Chemistry and Chemical Engineering, University of Jinan, No. 336 Nanxinzhuang West Road, 250022 Jinan, P. R. China
- Institute for Smart Materials & Engineering, University of Jinan, No. 336 Nanxinzhuang West Road, 250022 Jinan, P. R. China
| | - Xiuxian Zhao
- Institute for Smart Materials & Engineering, University of Jinan, No. 336 Nanxinzhuang West Road, 250022 Jinan, P. R. China
| | - Heng Zhao
- School of Chemistry and Chemical Engineering, University of Jinan, No. 336 Nanxinzhuang West Road, 250022 Jinan, P. R. China
| | - Zhongjiang Yang
- School of Chemistry and Chemical Engineering, University of Jinan, No. 336 Nanxinzhuang West Road, 250022 Jinan, P. R. China
| | - Liangguo Yan
- School of Water Conservancy and Environment, University of Jinan, No. 336 Nanxinzhuang West Road, 250022 Jinan, P. R. China
| | - Xuchuan Jiang
- Institute for Smart Materials & Engineering, University of Jinan, No. 336 Nanxinzhuang West Road, 250022 Jinan, P. R. China
| | - Yu Cui
- School of Chemistry and Chemical Engineering, University of Jinan, No. 336 Nanxinzhuang West Road, 250022 Jinan, P. R. China
| |
Collapse
|
13
|
Ai S, Huang Y, Xie T, Zhang X, Huang C. Fabrication of composites with ultra-low chitosan loadings and the adsorption mechanism for lead ions. Environ Sci Pollut Res Int 2020; 27:37927-37937. [PMID: 32613513 DOI: 10.1007/s11356-020-09906-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 04/16/2020] [Accepted: 06/26/2020] [Indexed: 06/11/2023]
Abstract
Through a facile impregnation-precipitation strategy, chitosan was dispersed on bentonite to prepare an organic/inorganic hybrid composite for Pb2+ adsorption. The strong promotion effect of a small amount of highly dispersed chitosan on the Pb2+ adsorption capacity of clay minerals was unveiled. With a chitosan loading of 0.4 wt%, the experimental adsorption capacity reached 261.3 mg/g. The good dispersion of chitosan played a crucial role in the high capacity. The large proportion of mesopores in the adsorbent facilitated mass transfer, and thereby adsorption equilibrium states could be achieved within 15 s. The adsorption isotherms were consistent with the Freundlich expression. The Pb2+ adsorption capacity was suppressed with the addition of 150 ppm Ca2+ and almost eliminated in the presence of 150 ppm Mg2+. The adsorption enthalpy change was measured to be - 28.6 kJ/mol and Gibbs free energy change was in the range of - 18.4 to - 16.7 kJ/mol, indicating that this adsorption process was exothermic and spontaneous. The FTIR and XPS results demonstrated that the amino groups on chitosan could bond with Pb2+, and contributed to the high adsorption capacity. DFT calculation results showed that the amino and hydroxyl groups in adjacent chitosan units could be tri-coordinated with Pb2+, and the energy of system was greatly decreased due to the coordination interaction.
Collapse
Affiliation(s)
- Shuo Ai
- Department of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou City, 545006, China.
- Guangxi Key Laboratory of Green Processing of Sugar Resources, Liuzhou City, 545006, China.
| | - Yongchun Huang
- Department of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou City, 545006, China
- Guangxi Key Laboratory of Green Processing of Sugar Resources, Liuzhou City, 545006, China
| | - Tenghui Xie
- Department of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou City, 545006, China
- Guangxi Key Laboratory of Green Processing of Sugar Resources, Liuzhou City, 545006, China
| | - Xiangyu Zhang
- Department of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou City, 545006, China
- Guangxi Key Laboratory of Green Processing of Sugar Resources, Liuzhou City, 545006, China
| | - Chengdu Huang
- Department of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou City, 545006, China
- Guangxi Key Laboratory of Green Processing of Sugar Resources, Liuzhou City, 545006, China
| |
Collapse
|
14
|
Liu T, Li YL, He JY, Hu Y, Wang CM, Zhang KS, Huang XJ, Kong LT, Liu JH. Porous boron nitride nanoribbons with large width as superior adsorbents for rapid removal of cadmium and copper ions from water. NEW J CHEM 2019. [DOI: 10.1039/c8nj05299a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Porous boron nitride nanoribbons with large width and their possible mechanism for the removal of heavy metals.
Collapse
Affiliation(s)
- Tao Liu
- Nano-Materials and Environmental Detection Laboratory
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- People's Republic of China
| | - Yu-Lian Li
- Nano-Materials and Environmental Detection Laboratory
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- People's Republic of China
| | - Jun-Yong He
- Nano-Materials and Environmental Detection Laboratory
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- People's Republic of China
| | - Yi Hu
- Nano-Materials and Environmental Detection Laboratory
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- People's Republic of China
| | - Cheng-Ming Wang
- Hefei National Laboratory for Physical Sciences at the Microscale
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Kai-Sheng Zhang
- Nano-Materials and Environmental Detection Laboratory
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- People's Republic of China
| | - Xing-Jiu Huang
- Nano-Materials and Environmental Detection Laboratory
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- People's Republic of China
| | - Ling-Tao Kong
- Nano-Materials and Environmental Detection Laboratory
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- People's Republic of China
| | - Jin-Huai Liu
- Nano-Materials and Environmental Detection Laboratory
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- People's Republic of China
| |
Collapse
|