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Liu L, Chen M, Hu N, Jiang Y, Zeng S, An Y. Precise control of photogenerated carrier behavior of zinc oxide through band reconstruction to enhance photocatalytic treatment of dye wastewater. J Colloid Interface Sci 2024; 678:494-505. [PMID: 39303567 DOI: 10.1016/j.jcis.2024.09.103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2024] [Revised: 09/04/2024] [Accepted: 09/10/2024] [Indexed: 09/22/2024]
Abstract
In the field of photocatalytic treatment of dye wastewater, zinc oxide (ZnO) is a typical semiconductor photocatalyst, but it has some disadvantages such as wide band gap, low carrier yield and easy recombination. In this study, Cr-ZnO/N-CQDs catalyst was synthesised using the strategy of p-type doping and construction of Z-scheme heterojunction. The results showed that the removal rate of Cr-ZnO/N-CQDs for MB dye was 97.42 %, which was 70.56 % higher than that of ZnO, and was still 92.16 % after 5 cycles, and the TOC removal rate of methylene blue wastewater was 88.60 %. The reason for the enhanced photocatalytic activity of Cr-ZnO/N-CQDs is that the π* electron (e-) in the N-CQDs interact with the 3d orbitals of Cr-ZnO, so that e- is more easily transferred from the valence band of Cr-ZnO to the conduction band of N-CQDs. The band gap of p-type Cr-ZnO is narrowed, which makes its photogenerated carrier yield increase, hole concentration raise, and the adsorption capacity of H2O molecules reduce by 1.04 eV. The density functional theory calculation shows that the maximum Gibbs free energy of Cr-ZnO for the production of hydroxyl radical is 0.05 eV lower than that of ZnO. This study lays theoretical and practical foundation for the photocatalytic treatment of dye wastewater with ZnO.
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Affiliation(s)
- Lu Liu
- School of Energy and Power Engineering, Changchun Institute of Technology, Changchun 130012, PR China.
| | - Miaomiao Chen
- School of Energy and Power Engineering, Changchun Institute of Technology, Changchun 130012, PR China
| | - Nan Hu
- School of Energy and Power Engineering, Changchun Institute of Technology, Changchun 130012, PR China
| | - Yi Jiang
- School of Science, Changchun Institute of Technology, Changchun 130012, PR China
| | - Shangjing Zeng
- School of Municipal and Environmental Engineering, Changchun Institute of Technology, Changchun 130012, PR China
| | - Yonglei An
- College of New Energy and Environment, Jilin University, Changchun 130021, PR China.
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2
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Moreno R, Yuste L, Morales G, Rojo F. Inactivation of Pseudomonas putida KT2440 pyruvate dehydrogenase relieves catabolite repression and improves the usefulness of this strain for degrading aromatic compounds. Microb Biotechnol 2024; 17:e14514. [PMID: 38923400 PMCID: PMC11196380 DOI: 10.1111/1751-7915.14514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Accepted: 06/09/2024] [Indexed: 06/28/2024] Open
Abstract
Pyruvate dehydrogenase (PDH) catalyses the irreversible decarboxylation of pyruvate to acetyl-CoA, which feeds the tricarboxylic acid cycle. We investigated how the loss of PDH affects metabolism in Pseudomonas putida. PDH inactivation resulted in a strain unable to utilize compounds whose assimilation converges at pyruvate, including sugars and several amino acids, whereas compounds that generate acetyl-CoA supported growth. PDH inactivation also resulted in the loss of carbon catabolite repression (CCR), which inhibits the assimilation of non-preferred compounds in the presence of other preferred compounds. Pseudomonas putida can degrade many aromatic compounds, most of which produce acetyl-CoA, making it useful for biotransformation and bioremediation. However, the genes involved in these metabolic pathways are often inhibited by CCR when glucose or amino acids are also present. Our results demonstrate that the PDH-null strain can efficiently degrade aromatic compounds even in the presence of other preferred substrates, which the wild-type strain does inefficiently, or not at all. As the loss of PDH limits the assimilation of many sugars and amino acids and relieves the CCR, the PDH-null strain could be useful in biotransformation or bioremediation processes that require growth with mixtures of preferred substrates and aromatic compounds.
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Affiliation(s)
- Renata Moreno
- Department of Microbial BiotechnologyCentro Nacional de Biotecnología, CSICMadridSpain
| | - Luis Yuste
- Department of Microbial BiotechnologyCentro Nacional de Biotecnología, CSICMadridSpain
| | - Gracia Morales
- Department of Microbial BiotechnologyCentro Nacional de Biotecnología, CSICMadridSpain
- Present address:
European UniversityMadridSpain
| | - Fernando Rojo
- Department of Microbial BiotechnologyCentro Nacional de Biotecnología, CSICMadridSpain
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Jeong SS, Park BJ, Yoon JH, Kirkham MB, Yang JE, Kim HS. Mechanistic Evidence for Hg Removal from Wastewater by Biologically Produced Sulfur. TOXICS 2024; 12:278. [PMID: 38668501 PMCID: PMC11053473 DOI: 10.3390/toxics12040278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 04/03/2024] [Accepted: 04/08/2024] [Indexed: 04/29/2024]
Abstract
A significant quantity of biologically produced sulfur (BPS) is generated as a by-product of chemical and biological desulfurization processes applied to landfill gas treatment. The beneficial upcycling of BPS has seen limited use in the environmental context. The effectiveness and underlying mechanism of BPS as an adsorbent for removing Hg2+ from both solution and wastewater were elucidated based on experiments encompassing surface characterization, adsorption isotherms, kinetics, and thermodynamics. The BPS exhibited remarkable efficacy in removing Hg2+ from solution, with the Langmuir model accurately describing the adsorption process and showing a maximum adsorption capacity of 244 mg g-1. Surface analysis through X-ray photoelectron spectroscopy and scanning electron microscopy revealed that Hg2+ complexed with sulfide on BPS surfaces, forming stable HgS. The adsorbed Hg was strongly retained in BPS, with less than 0.2% of the adsorbed Hg desorbed by strong acids. Adsorption kinetics followed the double-exponential first-order model, showing an initial rapid adsorption phase wherein 75% of the initial Hg2+ was removed within 5 min, followed by a slower adsorption rate. The thermodynamic parameters suggested that adsorption of Hg2+ by BPS was a spontaneous and endothermic process. Additionally, BPS effectively removed Hg2+ from wastewater, showing preference for Hg over other co-existing metals. These findings underscore the potential of BPS as an effective adsorbent for Hg2+ removal from wastewater.
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Affiliation(s)
- Seok-Soon Jeong
- Department of Biological Environment, Kangwon National University, Chuncheon 24341, Republic of Korea; (S.-S.J.); (B.-J.P.); (J.-H.Y.); (J.-E.Y.)
| | - Byung-Jun Park
- Department of Biological Environment, Kangwon National University, Chuncheon 24341, Republic of Korea; (S.-S.J.); (B.-J.P.); (J.-H.Y.); (J.-E.Y.)
| | - Jung-Hwan Yoon
- Department of Biological Environment, Kangwon National University, Chuncheon 24341, Republic of Korea; (S.-S.J.); (B.-J.P.); (J.-H.Y.); (J.-E.Y.)
| | - Mary Beth Kirkham
- Department of Agronomy, Kansas State University, Manhattan, KS 66506, USA;
| | - Jae-E. Yang
- Department of Biological Environment, Kangwon National University, Chuncheon 24341, Republic of Korea; (S.-S.J.); (B.-J.P.); (J.-H.Y.); (J.-E.Y.)
| | - Hyuck-Soo Kim
- Department of Biological Environment, Kangwon National University, Chuncheon 24341, Republic of Korea; (S.-S.J.); (B.-J.P.); (J.-H.Y.); (J.-E.Y.)
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Nadei OV, Agalakova NI. Optimal Reference Genes for RT-qPCR Experiments in Hippocampus and Cortex of Rats Chronically Exposed to Excessive Fluoride. Biol Trace Elem Res 2024; 202:199-209. [PMID: 37010724 DOI: 10.1007/s12011-023-03646-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Accepted: 03/20/2023] [Indexed: 04/04/2023]
Abstract
Normalization of the quantitative real-time PCR (RT-qPCR) data to the stably expressed reference genes is critically important for obtaining reliable results. However, all previous studies focused on F- toxicity for brain tissues used a single, non-validated reference gene, what might be a cause of contradictory or false results. The present study was designed to analyze the expression of a series of reference genes to select optimal ones for RT-qPCR analysis in cortex and hippocampus of rats chronically exposed to excessive fluoride (F-) amounts. Six-week-old male Wistar rats randomly assigned to four groups consumed regular tap water with 0.4 (control), 5, 20, and 50 ppm F- (NaF) for 12 months. The expression of six genes (Gapdh, Pgk1, Eef1a1, Ppia, Tbp, Helz) was compared by RT-qPCR in brain tissues from control and F--exposed animals. The stability of candidate reference genes was evaluated by coefficient of variation (CV) analysis and RefFinder online program summarizing the results of four well-acknowledged statistical methods (Delta-Ct, BestKeeper, NormFinder, and GeNorm). In spite of some discrepancies in gene ranking between these algorisms, Pgk1, Eef1a1, and Ppia were found to be most valid in cortex, while Ppia, Eef1a1, and Helz showed the greatest expression stability in hippocampus. Tbp and Helz were identified as the least stable genes in cortex, whereas Gapdh and Tbp are unsuitable for hippocampus. These data indicate that reliable mRNA quantification in the cortex and hippocampus of F--poisoned rats is possible using normalization to geometric mean of Pgk1+Eef1a1 or Ppia+Eef1a1 expression, respectively.
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Affiliation(s)
- Olga V Nadei
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 194223, Saint-Petersburg, Russia
| | - Natalia I Agalakova
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 194223, Saint-Petersburg, Russia.
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Tomei G, Saleem M, Ceriani E, Pinton A, Marotta E, Paradisi C. Cold Plasma for Green Advanced Reduction/Oxidation Processes (AROPs) of Organic Pollutants in Water. Chemistry 2023; 29:e202302090. [PMID: 37621157 DOI: 10.1002/chem.202302090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/21/2023] [Accepted: 08/21/2023] [Indexed: 08/26/2023]
Abstract
Cold plasma is gaining increasing attention as a novel tool to activate energy demanding chemical processes, including advanced reduction/oxidation processes (AROPs) of organic pollutants in water. The very complex milieu generated by discharges at the water/plasma interface comprises photons, strong oxidants and strong reductants which can be exploited for achieving the degradation of most any kind of pollutants. Despite the complexity of these systems, the powerful arsenal of mechanistic tools and chemical probes of physical organic chemists can be usefully applied to understand and develop plasma chemistry. Specifically, the added value of air plasma generated by in situ discharge with respect to ozonation (ex situ discharge) is demonstrated using phenol and various phenol derivatives and mechanistic evidence for the prevailing role of hydroxyl radicals in the initial attack is presented. On the reduction front, the impressive performance of cold plasma in inducing the degradation of recalcitrant perfluoroalkyl substances, which do not react with OH radicals but are attacked by electrons, is reported and discussed. The widely different reactivities of perfluorooctanoic acid (PFOA) and of perfluorobutanoic acid (PFBA) underline the crucial role played in these processes by the interface between plasma and solution and the surfactant properties of the treated pollutants.
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Affiliation(s)
- Giulia Tomei
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Mubbshir Saleem
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Elisa Ceriani
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Anna Pinton
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Ester Marotta
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Cristina Paradisi
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131, Padova, Italy
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Misra P, Paunikar VM. Healthy Drinking Water as a Necessity in Developing Countries Like India: A Narrative review. Cureus 2023; 15:e47247. [PMID: 38022361 PMCID: PMC10654688 DOI: 10.7759/cureus.47247] [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: 07/23/2023] [Accepted: 10/16/2023] [Indexed: 12/01/2023] Open
Abstract
Water is an indispensable part of human life. This article is an extensive review that focuses on the importance of water to sustain human life, the necessity of healthy, safe drinking water, and the health hazards of drinking untreated and contaminated water. We drink treated water thinking it to be safe without the knowledge that it, too, has harmful effects. Detrimental health effects due to water chlorination are mentioned in this article. The usage of nanoparticles for the treatment of water is an alternative to chlorination, but they are little in use as they are expensive. Transmission of waterborne diseases through drinking water is widespread in a developing country like India. A list of the pathogens contaminating drinking water is present in the review. Pathogens pollute water, and heavy metals and chemicals from industries, pesticides, pharmaceutical compounds, and radioactive waste also taint it. The harmful effects of metal and chemical toxicities on human health are discussed in this review. The government of India has launched several programmes to ensure clean, safe drinking water for all its residents. The study reflects on the treatment given to individuals suffering from waterborne diseases in India. Significant changes in health status in India have been seen recently after the execution of various government programmes to provide safe, healthy drinking water to all its residents.
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Affiliation(s)
- Purbasha Misra
- Medicine, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Vaishali M Paunikar
- Physiology, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND
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Lei Y, Yuan Z, Zeng Q, Wan B, Liu J, Wang W. Dynamic N6-methyladenosine RNA methylation landscapes reveal epi-transcriptomic modulation induced by ammonia nitrogen exposure in the Pacific whiteleg shrimp Litopenaeus vannamei. JOURNAL OF HAZARDOUS MATERIALS 2023; 458:131996. [PMID: 37423135 DOI: 10.1016/j.jhazmat.2023.131996] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 06/20/2023] [Accepted: 07/03/2023] [Indexed: 07/11/2023]
Abstract
Despite the versatility of RNA m6A methylation in regulating various biological processes, its involvement in the physiological response to ammonia nitrogen toxicity in decapod crustaceans like shrimp remains enigmatic. Here, we provided the first characterization of dynamic RNA m6A methylation landscapes induced by toxic ammonia exposure in the Pacific whiteleg shrimp Litopenaeus vannamei. The global m6A methylation level showed significant decrease following ammonia exposure, and most of the m6A methyltransferases and m6A binding proteins were significantly repressed. Distinct from many well-studied model organisms, m6A methylated peaks in the transcriptome of L. vannamei were enriched not only near the termination codon and in the 3' untranslated region (UTR), but also around the start codon and in the 5' UTR. Upon ammonia exposure, 11,430 m6A peaks corresponding to 6113 genes were hypo-methylated, and 5660 m6A peaks from 3912 genes were hyper-methylated. The differentially methylated genes showing significant changes in expression were over-represented by genes associated with metabolism, cellular immune defense and apoptotic signaling pathways. Notably, the m6A-modified ammonia-responsive genes encompassed a subset of genes related to glutamine synthesis, purine conversion and urea production, implying that m6A methylation may modulate shrimp ammonia stress responses partly through these ammonia metabolic processes.
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Affiliation(s)
- Yiguo Lei
- College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China; Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524088, China
| | - Zhixiang Yuan
- College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China; Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524088, China
| | - Qingtian Zeng
- College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China
| | - Boquan Wan
- College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China
| | - Jianyong Liu
- College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China; Guangdong Provincial Modern Seed Industry Park of the Pacific Whiteleg Shrimp, Zhanjiang 524088, China
| | - Wei Wang
- College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China; Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang 524088, China; Guangdong Provincial Modern Seed Industry Park of the Pacific Whiteleg Shrimp, Zhanjiang 524088, China.
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Wang HJ, Peng CW, Han X, Wang Y, Zhang J, Liu JL, Zhou MX, Tang F, Liu AL. Toxicological characteristics of drinking water in two large-scale municipal water supply systems of a metropolitan city in Central China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:64058-64066. [PMID: 37060410 DOI: 10.1007/s11356-023-26882-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 04/04/2023] [Indexed: 04/16/2023]
Abstract
Drinking water safety is threatened by numerous toxic organic pollutants difficult to chemically monitor. This study aimed to determine the toxicological profiles of organic extracts (OEs) of water samples from source to tap in two drinking water supply systems in a metropolitan city, Central China, during different hydrological periods. Mortality, DNA damage, growth, and development of Caenorhabditis elegans were evaluated following exposure to OEs. The median lethal doses of OEs of drinking water samples (n = 48) ranged from 266 REF (relative enrichment factor) to > 1563 REF. When tested at a dose of 100 REF, 56.25% (27/48) of OEs induced genotoxicity, 4.17% (2/48) inhibited the growth, and 45.83% (22/48) decreased the offspring number in C. elegans. No clear temporal-spatial variation patterns of the OEs toxicity indicators were observed. The correlations among the toxicity indicators were generally poor. The observed toxicities were not closely related to the level of dissolved organic carbon in drinking water. These findings support using multiple endpoint bioassays, such as C. elegans-based approaches, as complementary tools to conventional chemical analysis for drinking water quality monitoring.
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Affiliation(s)
- Huai-Ji Wang
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
- Wuhan Center for Disease Control and Prevention, Wuhan, 430022, People's Republic of China
| | - Chen-Wei Peng
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Xue Han
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
- School of Basic Medicine, Henan University of Chinese Medicine, Zhengzhou, 450046, People's Republic of China
| | - Yan Wang
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Jie Zhang
- Wuhan Water Group Company Limited, Wuhan, 430034, People's Republic of China
| | - Jun-Ling Liu
- Wuhan Center for Disease Control and Prevention, Wuhan, 430022, People's Republic of China
| | - Meng-Xuan Zhou
- Wuhan Water Group Company Limited, Wuhan, 430034, People's Republic of China
| | - Fei Tang
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Ai-Lin Liu
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China.
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Navya KN, Sujatha CH. Removing Deterrents Using Synthesized Hydrogel-Carboxymethyl Cellulose and Tannic Acid. CHEMISTRY AFRICA 2022. [DOI: 10.1007/s42250-022-00476-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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