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Phosphorus Speciation in Wetland Sediments of Zhujiang (Pearl) River Estuary,China

Chinese Geographical Science 2013年第5期23卷 574-583页

作者： WANG Lili YE Mei LI Qusheng ZOU Hang ZHOU Yongsheng Department of Environmental Engineering Jinan University key laboratory of water/soil toxic pollutants control and bioremediation Department of Education of Guangdong Province

Phosphorus fractions and adsorption-release characteristics of sediments in the Zhujiang （Pearl） River estuary wetland were investigated. Results showed that the total phosphorus （TP） content in surface sediments ranged from 648.9 mg/kg to 1064.0 mg/kg; inorganic phosphorus （IP） was the major fraction of TP and ranged from 422.5 mg/kg to 643.9 mg/kg. Among the inorganic phosphorus, the main fractions were phosphorus bound to A1 and Fe （Fe/A1-P）, and calcium-bound phosphorus （Ca-P）, accounting for 23%-42% and 21%-67% of IP, respectively. The vertical distribution of TP contents were significantly positive correlated with organic phosphorus （Org-P） and Fe/A1-P contents. The bio-available phosphorus contents in vertical sediments varied from 128.6 mg/kg to 442.9 mg/kg, mainly existed in Fe-AI/P fraction, and increased from the bottom to top sediments. The transport of phosphorus in sediment-water in- terface was controlled by the soil characteristics. The active Fe and A1 content was considered as the main factor that determines adsorp- tion capacity in vegetated marsh wetland. The P buffering capacity of the sediments in vegetated marsh wetland was greater than that in mudflat wetland. The potential risk of eutrophication in the study area is high. Reducing terrestrial phosphorus discharge and preventing the sediment Fe/A1-P release to the interstitial water are the possible solutions to reduce the risk of eutrophication in estuary wetlands, and planting vegetation in estuary wetland can also reduce the release of phosphorus in surface sediment.

关键词： estuary wetland phosphorus fraction adsorption-desorption

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Formation of active radicals and mechanism of photocatalytic degradation of phenol process using eosin sensitized TiO_2 under visible light irradiation

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Journal of Central South University 2013年第2期20卷 495-500页

作者：宋琳张鑫马云坤李明玉曾小龙 Department of Environmental Engineering Jinan University key laboratory of water/soil toxic pollutants control and bioremediation Department of Education of Guangdong Province

The role of oxygen and the generation of active radicals in the photocatalitic degradation of phenol were investigated using the eosin sensitized TiO2 as photocatalyst under visible light irradiation. Diffuse reflectance spectra show that the absorbancy range of eosin/TiO2 is expanded from 378 nm (TiO2 ) to about 600 nm. The photocatalitic degradation of phenol is almost stopped when the eosin/TiO2 system is saturated with N2 , which indicates the significance of O2 . The addition of NaN 3 (a quencher of single oxygen) causes about a 62% decrease in the phenol degradation. The phenol degradation ratio is dropped from 92% to 75% when the isopropanol (a quencher of hydroxyl radical) is present in the system. The experimental results show that there are singlet oxygen and hydroxyl radical generated in the eosin/TiO2 system under visible light irradiation. The changes of absorbancy indicate that the hydrogen peroxide might be produced. Through the analysis and comparison, it is found that the singlet oxygen is the predominant active radical for the degradation of phenol.

关键词： eosin sensitized TiO2 visible light photocatalytic degradation reaction mechanism

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Improvement of chromium biosorption through protoplast electrofusion between Candida tropicalis and Candida lipolytica

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Journal of Central South University 2012年第6期19卷 1693-1701页

作者：何宝燕尹华杨峰叶锦韶彭辉卢显妍张娜 Department of Environmental Engineering Jinan University key laboratory of water/soil toxic pollutants control and bioremediation of Guangdong Higher Education Institutes(Ji'nan University)

Protoplasts from Candida tropicalis and Candida lipolytica were fused under an optimized electrofusion （electrical pulse strength 6 kV/cm, pulse duration time 40μs and pulse times 5） and then regenerated on YEPD media for achieving new genotypes with higher chromium loading capacity. A target fusant RHJ-004 was screened out by its chromium resistance and chromium-sorbing capacity tests for further research. The comparative study of applicability shows that the fusant has better performance than its parent strains in respect of solution pH, biomass concentration and chromium loading capacity. Especially for treating low concentration Cr（VI）（〈20 mg/L）, above 80% chromium is sequestered from the aqueous phase at pH 1-9. Atomic force microscopy （AFM） visualizes the distribution of chromium on the binding sites of the cells, suggesting that the altered surface structure and intracellular constitutes of the fusant associate with its increased biosorption capacity. The rapid biosorption processes of chromium foUow the Langmuir model well.

关键词： chromium biosorption fusant protoplast electrofusion

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Biodegradation of Benzo[a]pyrene by Arthrobacter oxydans B4

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Pedosphere 2012年第4期22卷 554-561页

作者： PENG Hui YIN Hua DENG Jun YE Jin-Shao CHEN Shuo-Na HE Bao-Yan ZHANG Na Department of Environmental Engineering Jinan UniversityGuangzhou 510632(China) key laboratory of water//soil toxic pollutants control and bioremediation of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632(China)

A bacterial strain, Arthrobacter oxydans （B4）, capable of degrading benzo[a]pyrene （BaP） in water body, was isolated from a polycyclic aromatic hydrocarbons-contaminated site. Effects of different factors, such as reaction time, pH value, temperature and organic nutrients, on BaP biodegradation by the strain B4 were studied. After 5 d treatment, the concentration of BaP in mineral salts medium was reduced to 0.318 mg L-1, compared to the initial concentration of 1.000 mg L-1. There was a process of acid formation during the degradation with pH falling from initial 7.01 to 4.61 at 5 d, so keeping the water body under slightly alkaline condition was propitious to BaP degradation. Strain B4 efficiently degraded BaP at 20 to 37 ~C with addition of organic nutrients. The biodegradation and transformation of BaP mainly occurred on cell surfaces, and extracellular secretions played an important role in these processes. Fourier transform infrared spectroscopy and gas chromatograph-mass spectrometer analyses of metabolites showed that ring cleavage occurred in the BaP degradation process and the resulting metabolically utilizable substrates were generated as sole carbon sources for B4 growth. Furthermore, mineralization extent of metabolites was verified by determining the total organic carbon and inorganic carbon in the degradation system.

关键词： degradation mechanism metabolites microbial transformation polycyclic aromatic hydrocarbon

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Characteristics of copper removal and ion release during copper biosorption by Stenotrophomonas maltophilia in presence of benzo[a]pyrene

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Journal of Central South University 2013年第10期20卷 2796-2805页

作者：田云叶锦韶尹华彭辉李取生白洁琼谢丹平 Department of Environmental Engineering Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education InstitutesJinan University College of Environment and Energy Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of EducationSouth China University of Technology key Lab of water and Air Pollution control of Guangdong Province

The ability of Stenotrophomonas maltophilia was demonstrated to selectively remove Cu2+from Cu(NO3)2 solution under the circumstance that 1 mg/L benzo[a]pyrene(BaP) was either present or not. The removal ratios of 2 and 10 mg/L Cu2+by 0.25 g/L biosorbent are up to 80% and 49% at 10 min, respectively. The biosorption includes ion exchange, NO3 reduction, ion release, and cell oxidation by Cu2+. BaP does not significantly affect Cu2+removal and ion release. Although 2 mg/L Cu2+increases the release of PO4 3, K+, NH4 +and Ca2+, 10 mg/L Cu2+has strong oxidation on cell, and then decreases NO3 reduction and hinders the release of K+, NH4 +and Ca2+. Exogenous cations inhibit the Cu2+biosorption, while additional anions increase the removal ratios of 10 mg/L Cu2+from 52% to 88%.

关键词： biosorption copper benzo[a]pyrene Stenotrophomonas maltophilia

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Adverse Effect of TiO2 Nanoparticles on Antioxidant System and Antitumor Activities of Macroalgae Gracilaria lemaneiformis

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Journal of Ocean University of China 2019年第5期18卷 1130-1138页

作者： LIU Jie YIN Pinghe ZHAO Ling Department of Chemistry Jinan UniversityGuangzhou 510632China Research Center of Analysis and Test Jinan UniversityGuangzhou 510632China key laboratory of water/soil toxic pollutants control and bioremediation of Guangdong Higher Education Institutes Department of Environmental EngineeringJinan UniversityGuangzhou 510632China

Recently,the widespread use of TiO2 nanoparticles(nano-TiO2)has attracted the global concern regarding their adverse effects to aquatic *** may get to the aquatic environments and harm the growth of *** paper presents the studies of nano-TiO2 concentrations influence on the photosynthetic characteristics,antioxidant system and antitumor activity of marine macroalgae Gracilaria lemaneiformis after exposed to 0,5,10,20 or 40 mg L^-1 of *** showed that the photosynthetic pigment content of *** obviously decreased and the antioxidant defense system was significantly disturbed after exposure to *** with control,the maximum level of malondialdehyde showed 3.3-fold increase for 15 days exposure to *** activity of superoxide dismutase and catalase enhanced obviously by *** aqueous extract of ***(AEGL)possesses anticancer activity against HepG2 liver cancer cells proliferation and the 48 h-cell inhibition exceeds 35%.But the toxicity of nano-TiO2 would inhibit the anticancer activity of *** *** was exposed to nano-TiO2,the effect of the aqueous extract of *** on the cell inhibition,reactive oxygen species production,apoptosis,cycle arrest of HepG2 cells significantly lessened,and which were linearly associated with nano-TiO2 exposure *** results further confirmed that nano-TiO2 can inhibit the anticancer activity of *** results in this work imply that macroalgae can be an effective biomarker of nano-TiO2 contaminant,and can be useful indicator to evaluate ecological effects of increasing pollutants in marine ecosystem.

关键词： anticancer activity Gracilaria lemaneiformis macroalgae nanoparticles oxidative damage photosynthetic pigment

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Adsorption of Naphthalene on Modified Zeolite from Aqueous Solution

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Journal of Environmental Protection 2017年第4期8卷 416-425页

作者： Ning Li Wang-Yu Cheng Yong-Zhang Pan School of Environment Jinan University Guangzhou China key laboratory of water/soil toxic pollutants control and bioremediation of Guangdong Higher Education Institutes Jinan University Guangzhou China

In this study, the modified zeolite with certain hydrophobicity was prepared by modifying natural zeolite by the silane coupling agents such as vinyltrimethoxysilane (VTMO), trimethoxysilane (TMS) and trimethylchlorosilane (TMCS). The modified zeolite has a higher hydrophobicity and adsorption capacity than natural zeolite while ensuring the advantages of natural zeolite, which is more conducive to the adsorption of organic pollutants from aqueous solution. The adsorption experiment on naphthalene in aqueous solution shows that the modified zeolite has a stronger adsorption capacity. In the adsorption thermodynamics experiment, the isothermal adsorption models such as Freundlich and Langmuir can better describe the adsorption of naphthalene on modified zeolite, but the isothermal adsorption model Freundlich has a higher correlation. At 303K, the static adsorption capacity is 339μg/g. The kinetic analysis shows that the adsorption of naphthalene on modified zeolite conforms to the quasi-second order kinetic model.

关键词： Silane Coupling Agent Modified Zeolite Naphthalene Adsorption

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UV/H2O2 oxidation of tri(2-chloroethyl) phosphate: Intermediate products, degradation pathway and toxicity evaluation

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Journal of Environmental Sciences 2020年第12期32卷 55-61页

作者： Qiuyi Ji Huan He Zhanqi Gao Xiaohan Wang Shaogui Yang Cheng Sun Shiyin Li Yong Wang Limin Zhang School of Environment Nanjing Normal UniversityNanjing 210023China State Environmental Protection key laboratory of Monitoring and Analysis for Organic pollutants in Surface water Environment Monitoring Center of JiangsuNanjing 210036China State key laboratory of Pollution control and Resources Reuse School of EnvironmentNanjing UniversityNanjing 210023China School of Environment Northeast Normal UniversityChangchun 130024China

Tri(2-chloroethyl) phosphate(TCEP) with the initial concentration of 5 mg/L was degraded by UV/H2O2 oxidation process. The removal rate of TCEP in the UV/H2O2 system was 89.1% with the production of Cl-and PO4^3- of 0.23 and 0.64 mg/L. The removal rate of total organic carbon of the reaction was 48.8% and the pH reached 3.3 after the reaction. The oxidative degradation process of TCEP in the UV/H2O2 system obeyed the first order kinetic reaction with the apparent rate constant of 0.0025 min^-1( R^2 = 0.9788). The intermediate products were isolated and identified by gas chromatography-mass spectrometer. The addition reaction of HO · and H2O and the oxidation reaction with H2O2 were found during the degradation pathway of 5 mg/L TCEP in the UV/H2O2 system. For the first time, environment risk was estimated via the "ecological structure activity relationships" program and acute and chronic toxicity changes of intermediate products were pointed out. The luminescence inhibition rate of photobacterium was used to evaluate the acute toxicity of intermediate products. The results showed that the toxicity of the intermediate products increased with the increase of reaction time, which may be due to the production of chlorine compounds. Some measures should be introduced to the UV/H2O2 system to remove the highly toxic Cl-containing compounds, such as a nanofiltration or reverse osmosis unit.

关键词： Tri(2-chloroethyl)phosphate(TCEP) UV/H2O2 Mechanisms toxicity evaluation

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Nanobiochar for the remediation of contaminated soil and water:challenges and opportunities

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Biochar 2023年第1期5卷 21-41页

作者： Mengyuan Jiang Lizhi He Nabeel Khan Niazi Hailong Wang Williamson Gustave Meththika Vithanage Kun Geng Hua Shang Xiaokai Zhang Zhenyu Wang Institute of Environmental Processes and Pollution control School of Environmental and Civil EngineeringJiangnan UniversityWuxi 214122China key laboratory of soil Contamination bioremediation of Zhejiang Province Zhejiang A&F UniversityLin’an 311300China Institute of soil and Environmental Sciences University of Agriculture FaisalabadFaisalabad 38040Pakistan Faculty of Science&Engineering Southern Cross UniversityLismoreNSW 2480Australia Biochar Engineering Technology Research Center of Guangdong Province School of Environmental and Chemical EngineeringFoshan UniversityFoshan 528000China School of Chemistry Environmental&Life SciencesUniversity of the BahamasNassau 4912Bahamas Ecosphere Resilience Research Centre Faculty of Applied SciencesUniversity of Sri JayewardenepuraNugegoda 10250Sri Lanka

Although research on biochar has received increasing attention for environmental and agricultural applications,the significance of nanobiochar for environmental pollutant remediation is poorly *** contrast to bulk biochar,nanobiochar has superior physicochemical properties such as high catalytic activity,unique nanostructure,large specific surface area and high mobility in the soil *** unique characteristics make nanobiochar an ideal candidate for pollution *** far,the research on nanobiochar is still in its infancy and most of the previous studies have only been conducted for exploring its properties and environmental *** lack of in-depth summary of nanobiochar’s research direction makes it a challenge for scientists and researchers *** in this review,we established some key fabrication methods for nanobiochar with a focus on its performance for the removal of pollutants from the *** also provided up-to-date information on nanobiochar’s role in environmental remediation and insights into different mechanisms involved in the pollutant ***,nanobiochar application is increasing,the associated drawbacks to the soil ecosystem have not received enough research ***,further research is warranted to evaluate the potential environmental risks of nanobiochar before large scale application.

关键词： Environmental pollution Nanotechnology Modified biochar Remediation soil and water system

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A systematic understanding of microbial reductive dechlorination towards an improved“one health”soil bioremediation:A review and perspective

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Science China(Technological Sciences) 2024年第10期67卷 3009-3031页

作者： HE Yan LI ShuYao YUAN Jing CHENG Jie DOU JiBo YANG XueLing XU JianMing Zhejiang Provincial key laboratory of Agricultural Resources and Environment Institute of Soil and Water Resources and Environmental ScienceCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China key laboratory of Environment Remediation and Ecological Health Ministry of EducationHangzhou 310058China Microbiome Network and Department of Agricultural Biology Colorado State UniversityFort Collins CO 80523USA Departments of Chemistry and Chemical&Biomolecular Engineering Institute for Functional Intelligent Materials(I-FIM)National University of SingaporeSingapore 119077Singapore

Chlorinated organic pollutants(COPs),both emerging and traditional,are typical persistent pollutants that harm soil health *** mediated reductive dechlorination is the optimal way to completely remove COPs from anaerobic soil through a redox reaction driven by electron transfer during microbial anaerobic ***,the dechlorinated depletion of COPs in situ often interacts with multiple element biogeochemical activities,e.g.,methanogenesis,sulfate reduction,iron reduction,and *** the relevance of biogeochemical cycles between COPs and multiple elements and the coupled mechanisms involved,thus,helps to develop effective pollution control strategies with the balance between pollution degradation and element cycles in heterogeneous soil,ultimately contributing to“one health”*** this review,we summarized the microbial-chemical coupling redox processes and the driving factors,elucidated the interspecies metabolites exchange and electron transfer mechanisms within COP-dechlorinating communities,and further proposed a detailed design,construction,and analysis framework of engineering COP-dechlorinating microbiomes via“top-down”selfassembly and“bottom-up”synthesis to pave the way from laboratory to practical field ***,we delve into the major challenges and perspectives surrounding the design of state-of-the-art synthetic microbial *** goal is to improve the understanding of the microbial-mediated coupling between reductive dechlorination and element biogeochemical cycling,with a particular focus on the implications for health-integrated soil bioremediation under the“one health”concept.

关键词： reductive dechlorination biogeochemical redox processes interspecies interaction synthetic microbiomes anaerobic soils

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