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Luo L, Jiang X, Du Y, Dzakpasu M, Yang C, Guo W, Ngo HH, Wang XC. Impact of organic matter molecular weight on hexavalent chromium enrichment in green microalgae. JOURNAL OF HAZARDOUS MATERIALS 2024; 470:134304. [PMID: 38615650 DOI: 10.1016/j.jhazmat.2024.134304] [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: 02/03/2024] [Revised: 03/22/2024] [Accepted: 04/11/2024] [Indexed: 04/16/2024]
Abstract
In lightly polluted water containing heavy metals, organic matter, and green microalgae, the molecular weight of organic matter may influence both the growth of green microalgae and the concentration of heavy metals. This study elucidates the effects and mechanisms by which different molecular weight fractions of fulvic acid (FA), a model dissolved organic matter component, facilitate the bioaccumulation of hexavalent chromium (Cr(VI)) in a typical green alga, Chlorella vulgaris. Findings show that the addition of FA fractions with molecular weights greater than 10 kDa significantly enhances the enrichment of total chromium and Cr(VI) in algal cells, reaching 21.58%-31.09 % and 16.17 %-22.63 %, respectively. Conversely, the efficiency of chromium enrichment in algal cells was found to decrease with decreasing molecular weight of FA. FA molecular weight within the range of 0.22 µm-30 kDa facilitated chromium enrichment primarily through the algal organic matter (AOM) pathway, with minor contributions from the algal cell proliferation and extracellular polymeric substances (EPS) pathways. However, with decreasing FA molecular weight, the AOM and EPS pathways become less prominent, whereas the algal cell proliferation pathway becomes dominant. These findings provide new insights into the mechanism of chromium enrichment in green algae enhanced by medium molecular weight FA.
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Affiliation(s)
- Li Luo
- International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an 710055, China.
| | - Xu Jiang
- International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an 710055, China
| | - Yifei Du
- Yellow River Institute of Eco-Environmental Research, Henan Province, No.6, Changchun Road, Zhengzhou 450003, China
| | - Mawuli Dzakpasu
- International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an 710055, China
| | - Chao Yang
- International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an 710055, China
| | - Wenshan Guo
- Centre for Technology in Water and Wastewater, Faculty of Engineering and Information Technology, University of Technology, Sydney, NSW 2007, Australia
| | - Huu Hao Ngo
- Centre for Technology in Water and Wastewater, Faculty of Engineering and Information Technology, University of Technology, Sydney, NSW 2007, Australia
| | - Xiaochang C Wang
- International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an 710055, China
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Xue S, Miao Z, Gao M, Wan K. Structural analysis of lignite-derived humic acid and its microscopic interactions with heavy metal ions in aqueous solution. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 897:165385. [PMID: 37423290 DOI: 10.1016/j.scitotenv.2023.165385] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 06/01/2023] [Accepted: 07/06/2023] [Indexed: 07/11/2023]
Abstract
Understanding heavy metal environmental behavior with humic acid (HA) is critical. There is currently a lack of information on the control of its structure organization on its reactivity to metals. The difference in HA structures under non-homogeneous conditions is critical for revealing its micro-interaction with heavy metals. The heterogeneity of HA was reduced using the fractionation method in this study, the chemical properties of HA fractions were analyzed using py-GC/MS, and the structural units of HA were proposed. Pb2+ was used as a probe to investigate the difference in the adsorption capacity of HA fractions. The microscopic interaction of structures with heavy metal was investigated and validated by structural units. The results show that as molecular weight increased, the oxygen content and the number of aliphatic chains decreased, but the opposite was true for aromatic and heterocyclic rings. The adsorption capacity for Pb2+ was as follows: HA-1 > HA-2 > HA-3. According to the linear analysis of the influencing factors of maximum adsorption capacity and possibility factors, the adsorption capacity was positively correlated with the contents of acid groups, carboxyl groups, phenolic hydroxyl groups, and the number of aliphatic chains. The phenolic hydroxyl group and the aliphatic-chain structure have the greatest impact. Therefore, structural differences and the number of active sites play an important role in adsorption. The binding energy of HA structural units to Pb2+ was calculated. It was found that the chain structure is easier to bind to heavy metals than aromatic rings, and the affinity of-COOH to Pb2+ is greater than that of -OH. These findings can help improve the adsorbent design.
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Affiliation(s)
- Shuwen Xue
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
| | - Zhenyong Miao
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
| | - Mingqiang Gao
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
| | - Keji Wan
- National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China.
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Wan K, Wang G, Bo W, Xue S, Miao Z. A Sandwich Structure of Fulvic Acid and PMIDA-Modified LDHs for the Simultaneous Removal of Cu 2+ and Aniline in Multicomponent Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:2537-2547. [PMID: 36758167 DOI: 10.1021/acs.langmuir.2c02724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The coexistence of organic and inorganic pollutants in industrial wastewater has emerged as a concerning environmental issue worldwide due to the critical levels of biological toxicity of these pollutants. In this context, the present study proposes a sandwich structure of fulvic acid and PMIDA-modified LDHs (FA/PMIDA-LDHs) for the simultaneous removal of Cu2+ and aniline from wastewater. The specific structure was synthesized using a combination of coprecipitation and impregnation methods. Abundant benzene rings and oxygen-containing functional groups greatly increased the number of sites for the adsorption of both Cu2+ and aniline. The maximum adsorption capacity of Cu2+ and aniline in solution with initial pH 5.0 at 25 °C could reach 221.24 and 132.28 mg/g, respectively. Cu2+ could be chelated by the functional groups in the FA/PMIDA-LDHs structure, and a coupled reduction-complexation mechanism was proposed for this process. The uptake of aniline on FA/PMIDA-LDHs was demonstrated to be a result of the combination of coordination forces, hydrophobic effects, π-π interactions, and hydrogen bonds. In a multicomponent solution, FA/PMIDA-LDHs exhibited excellent salt tolerance of up to 1000 mg/L of Na+ or Ca2+. The effects of Fe3+, Ni2+, Cl-, Cr2O72-, SO42-, and H2PO4- on the uptakes of Cu2+ and aniline were also investigated.
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Affiliation(s)
- Keji Wan
- National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Guoqiang Wang
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Wenting Bo
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Shuwen Xue
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Zhenyong Miao
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
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Gong G, Liang S, Zhang Y, Zhang Y, Sanjaa B, Zhang F, Wang Z, Li Z, Li R, Lu S. Extraction, Fractional Structure and Physiological Activities of Fulvic Acid from Yunnan Xundian Lignite. ChemistrySelect 2022. [DOI: 10.1002/slct.202202411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Guanqun Gong
- Laboratory of Coal Processing and Efficient Utilization of Ministry of Education School of Chemical Engineering & Technology China University of Mining and Technology Xuzhou 221116 China
| | - Shaojie Liang
- School of Chemical Engineering & Technology China University of Mining and Technology Xuzhou 221116 China
| | - Yingjie Zhang
- Laboratory of Coal Processing and Efficient Utilization of Ministry of Education School of Chemical Engineering & Technology China University of Mining and Technology Xuzhou 221116 China
| | - Yongzhen Zhang
- School of Chemical Engineering & Technology China University of Mining and Technology Xuzhou 221116 China
| | - Batbileg Sanjaa
- Institute of Chemistry and Chemical Technology Mongolian Academy of Sciences Ulaanbaatar 13330 Mongolia
| | - Fushui Zhang
- Baoqing Coal Power & Chemical Corporation CHN Energy Shuangyashan 230500 China
| | - Ziyan Wang
- School of Chemical Engineering & Technology China University of Mining and Technology Xuzhou 221116 China
| | - Zhiling Li
- School of Chemical Engineering & Technology China University of Mining and Technology Xuzhou 221116 China
| | - Ruonan Li
- School of Chemical Engineering & Technology China University of Mining and Technology Xuzhou 221116 China
| | - Shan Lu
- School of Chemical Engineering & Technology China University of Mining and Technology Xuzhou 221116 China
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