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Liu G, Hu Z, Chen X, Li W, Wu Y, Liu Z, Miao L, Luo Z, Wang J, Guo Y. Oxygen vacancy-rich Ag/CuO nanoarray mesh fabricated by laser ablation for efficient bacterial inactivation. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133269. [PMID: 38134696 DOI: 10.1016/j.jhazmat.2023.133269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/07/2023] [Accepted: 12/12/2023] [Indexed: 12/24/2023]
Abstract
The contamination of drinking water by microbes is a critical health concern, underscoring the need for safe, reliable, and efficient methods to treat pathogenic microorganisms. While most sterilization materials are available in powder form, this presents safety risks and challenges in recycling. Herein, this study reports the preparation of an innovative copper oxide supported silver monolithic nanoarray mesh with abundant oxygen vacancies (Ag/CuO-VO) by laser ablation. The instantaneous high temperature caused by laser ablation preserves the material's original structure while generating oxygen vacancies on the CuO surface. The Ag/CuO-VO mesh demonstrated a remarkable ability to inactivate over 99% of Escherichia coli (E. Coli) within 20 min. The oxygen vacancies in the Ag/CuO-VO enhance interactions between oxygen species and the Ag/CuO-VO, leading to the accumulation of large amounts of reactive oxygen species (ROS). The generated ROS effectively disrupt both layers of the bacterial cell wall - the peptidoglycan and the phospholipid - as confirmed by Fourier Transform Infrared (FTIR) spectroscopy, culminating in cell death. This research presents a monolithic material capable of inactivating pathogenic microorganisms efficiently, offering a significant advancement in water sterilization technology.
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Affiliation(s)
- Guoli Liu
- College of Chemistry, Central China Normal University, Wuhan 430079, PR China
| | - Zhixin Hu
- College of Chemistry, Central China Normal University, Wuhan 430079, PR China
| | - Xiaoping Chen
- College of Chemistry, Central China Normal University, Wuhan 430079, PR China
| | - Weihao Li
- College of Chemistry, Central China Normal University, Wuhan 430079, PR China
| | - Yan Wu
- College of Chemistry, Central China Normal University, Wuhan 430079, PR China
| | - Zuocheng Liu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Lei Miao
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Zhu Luo
- College of Chemistry, Central China Normal University, Wuhan 430079, PR China; Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, Wuhan 430079, PR China; Wuhan Institute of Photochemistry and Technology, Wuhan 430083, PR China
| | - Jinlong Wang
- College of Chemistry, Central China Normal University, Wuhan 430079, PR China; Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, Wuhan 430079, PR China; Wuhan Institute of Photochemistry and Technology, Wuhan 430083, PR China.
| | - Yanbing Guo
- College of Chemistry, Central China Normal University, Wuhan 430079, PR China; Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, Wuhan 430079, PR China; Wuhan Institute of Photochemistry and Technology, Wuhan 430083, PR China.
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Agbasi JC, Ezugwu AL, Omeka ME, Ucheana IA, Aralu CC, Abugu HO, Egbueri JC. More about making profits or providing safe drinking water? A state-of-the-art review on sachet water contamination in Nigeria. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART C, TOXICOLOGY AND CARCINOGENESIS 2024:1-43. [PMID: 38439577 DOI: 10.1080/26896583.2024.2319009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/06/2024]
Abstract
Public health concerns on surface and groundwater contamination worldwide have increased. Sachet water contamination has also raised serious concerns across many developing countries. While previous studies attempted to address this issue, this review takes a different approach by utilizing a comprehensive analysis of physicochemical parameters, heavy metals, and microbial loads tested in sachet water across Nigeria's six geopolitical zones, within the period of 2020-2023. In this review study, over 50 articles were carefully analyzed. Collected data unveiled regional variations in the quality of sachet water across Nigeria. Noteworthy concerns revolve around levels of pH, total hardness, magnesium, calcium, nickel, iron, lead, mercury, arsenic, and cadmium. Fecal contamination was also identified as a significant issue, with the prevalence of several pathogens like Escherichia coli, Salmonella typhi, Enterobacter cloacae, Staphylococcus aureus, and Enterococcus faecalis. The manufacturing, delivery, storage, and final sale of sachet water, as well as poor environmental hygiene, were identified as potential contamination sources. The intake of contaminated sachet water exposes the citizens to waterborne and carcinogenic diseases. While the sachet water industry keeps growing and making profits, it is apparent that improvement calls made by previous studies, regarding the quality of water produced, have not been paid serious attention.
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Affiliation(s)
- Johnson C Agbasi
- Department of Geology, Chukwuemeka Odumegwu Ojukwu University, Uli, Anambra State, Nigeria
| | - Arinze Longinus Ezugwu
- Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Enugu State, Nigeria
| | - Michael Ekuru Omeka
- Department of Geology, University of Calabar, P.M.B. 1115, Calabar, Cross River State, Nigeria
| | - Ifeanyi Adolphus Ucheana
- Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Enugu State, Nigeria
- Central Science Laboratory, University of Nigeria, Nsukka, Enugu State, Nigeria
| | | | - Hillary Onyeka Abugu
- Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Enugu State, Nigeria
| | - Johnbosco C Egbueri
- Department of Geology, Chukwuemeka Odumegwu Ojukwu University, Uli, Anambra State, Nigeria
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Schalli M, Platzer S, Haas D, Reinthaler FF. The behaviour of Escherichia coli and Pseudomonas aeruginosa in bottled mineral water. Heliyon 2023; 9:e21634. [PMID: 38027778 PMCID: PMC10643266 DOI: 10.1016/j.heliyon.2023.e21634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 10/19/2023] [Accepted: 10/25/2023] [Indexed: 12/01/2023] Open
Abstract
Microbial contamination of bottled water during the filling and capping procedure is a problem which should be avoided. The examination of the influence of carbon dioxide (CO2) on bacterial growth of Escherichia coli (E. coli) and Pseudomonas aeruginosa (P. aeruginosa) in bottled mineral water was the aim of this study. Commercially available glass bottles with plastic screw caps filled with natural mineral water (without additional CO2 "still" (StMW) and with CO2 "sparkling" (SpMW) were obtained from a manufacturer in the province of Styria, Austria. The artificial contamination was performed in the lab by opening the bottle with subsequent addition of a bacterial solution with a defined number of bacteria. For each bacterial strain, 12 bottles were prepared. Samples (100 mL) were taken after a specific number of days, filtrated and placed on Endo Agar for cultivation. After incubation for 24 h bacterial colonies were counted. In this study CO2 addition to bottled water reduced colony forming units of the two investigated bacterial strains over time.
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Affiliation(s)
- Michael Schalli
- Department for Water-Hygiene and Micro-Ecology, D&R Institute of Hygiene, Microbiology and Environmental Medicine, Medical University of Graz, 8010, Graz, Austria
| | - Sabine Platzer
- Department for Water-Hygiene and Micro-Ecology, D&R Institute of Hygiene, Microbiology and Environmental Medicine, Medical University of Graz, 8010, Graz, Austria
| | - Doris Haas
- Applied Hygiene and Aerobiology, D&R Institute of Hygiene, Microbiology and Environmental Medicine, Medical University of Graz, 8010, Graz, Austria
| | - Franz F. Reinthaler
- Department for Water-Hygiene and Micro-Ecology, D&R Institute of Hygiene, Microbiology and Environmental Medicine, Medical University of Graz, 8010, Graz, Austria
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Angnunavuri PN, Attiogbe F, Mensah B. Particulate plastics in drinking water and potential human health effects: Current knowledge for management of freshwater plastic materials in Africa. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 316:120714. [PMID: 36423889 DOI: 10.1016/j.envpol.2022.120714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 11/16/2022] [Accepted: 11/19/2022] [Indexed: 06/16/2023]
Abstract
Plastic materials have contributed to the release of environmentally relevant particulate plastics which can be found almost everywhere and may be present in drinking water. Human exposure to these materials is diverse and our understanding of their internalization in the human body is incipient. This review discusses the state of knowledge of particulate plastics exposure in drinking water and the potential risks of adverse health in the human body. Particulate plastics have problematized water systems worldwide, and about 4,000,000 fine plastics may be ingested from drinking water annually by an individual. Testing methods for these materials in environmental media are presently inconsistent and standard protocols do not exist. Their potential ecotoxicological consequences are recognised to be linked to their physicochemical diversity, biological transpositions, and cytological tolerance in living organisms. It is observed that toxicological endpoints are varied and lack properly defined modes of action. In particular, fine particulate plastics have been observed to translocate into body tissues and cells where they are capable of provoking endocrine disruption, genetic mutations, and cancer responses. We propose a reclassification of particulate plastics to cater for their biological deposition and attributable risks of adverse health. Environmental management of particulate plastics in many developing countries is weak and their potential releases into drinking water have received limited research. Given that large populations are exposed to fresh surface water and plastic packaged drinking water worldwide, and that the risk assessment pathways are unvalidated at the moment, we argue for developing countries to increase their capacity for the environmental monitoring and circular management of plastic materials. Large-scale epidemiological cohort studies and surrogate assessment pathways are also recommended to provide a better understanding of the hazard characterization of particulate plastics exposure.
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Affiliation(s)
- Prosper Naah Angnunavuri
- School of Engineering, Department of Civil and Environmental Engineering, University of Energy and Natural Resources, Sunyani, Ghana.
| | - Francis Attiogbe
- School of Engineering, Department of Civil and Environmental Engineering, University of Energy and Natural Resources, Sunyani, Ghana
| | - Bismark Mensah
- School of Engineering, Department of Materials Engineering, University of Ghana, Legon, Ghana
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Angnunavuri PN, Attiogbe F, Mensah B. Microbial contamination and quantitative microbial risk assessment of high-density polyethylene (HDPE) film sachet drinking water in Ghana. JOURNAL OF WATER AND HEALTH 2022; 20:1587-1603. [PMID: 36308501 DOI: 10.2166/wh.2022.163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The present research estimated the impact of storage on the microbial quality of high-density polyethylene drinking water. Samples were taken from two popular companies in Greater Accra using a two-sided exact test in SAS JMP to estimate the sample size. The samples were stored across three temperature profiles at 8 °C, 30 °C (average room temperature), and 40 °C (average outdoor temperature) for 28 days. The samples were examined using standard microbiological methods for heterotrophic plate counts (HPCs), faecal coliforms, and Escherichia coli. The data were described and regressed with Microsoft Excel, Argo 4.3.1, and SAS JMP software. The results demonstrated increasing deterioration of the water samples for all microbial indices at all temperatures with increasing storage duration. The highest HPC, faecal coliforms, and E. coli were 1,312; 622; and 252 cfu/100 mL, respectively, all at 40 °C. The daily risk of infection due to E. coli O157:H7 was 5.22 × 10-5 infections per child per day for children under 5 years, and 1.6 × 10-4 attacks per adult per day, compared to the upper limit of 1.0 × 10-6. These results are higher than recommended exposures, and interventions along the sachet drinking water value chain are needed to protect public health.
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Affiliation(s)
- Prosper Naah Angnunavuri
- School of Engineering, Department of Civil and Environmental Engineering, University of Energy and Natural Resources, Sunyani, Ghana E-mail:
| | - Francis Attiogbe
- School of Engineering, Department of Civil and Environmental Engineering, University of Energy and Natural Resources, Sunyani, Ghana E-mail:
| | - Bismark Mensah
- School of Engineering, University of Ghana, Legon, Ghana
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