期刊：
Environmental Geochemistry and Health,2024年46(1):1-15 ISSN：0269-4042
通讯作者：
Zhou, DS
作者机构：
[Huang, Zhigang; Xiao, Ye; Long, Jiumei; Zhou, Dongsheng; Xiao, Hanxi] Zunyi Normal Univ, Coll Resources & Environm, Zunyi 563006, Peoples R China.;[Long, Jiumei; Huang, Binyan] Hengyang Normal Univ, Coll Life Sci, Hengyang 421008, Peoples R China.;[Tan, Di] Changde Ecol Environm Bur, Changde 415000, Peoples R China.
通讯机构：
[Zhou, DS ] Z;Zunyi Normal Univ, Coll Resources & Environm, Zunyi 563006, Peoples R China.
关键词：
Antimony and arsenic contamination;Soil washing;Agricultural soil;Bioavailability
摘要：
Antimony (Sb) and arsenic (As) contamination in agricultural soil poses human health risks through agricultural products. Soil washing with degradable low molecular weight organic acids (LMWOAs) is an eco-friendly strategy to remediate agricultural soils. In this study, three eco-friendly LMWOAs, oxalic acid (OA), tartaric acid (TA), and citric acid (CA), were used to treat Sb and As co-contaminated agricultural soil from Xikuangshan mine area. The OA, TA, and CA washed out 18.4, 16.8, and 26.6% of Sb and 15.3, 19.9, and 23.8% of As from the agricultural soil, with CA being the most efficient reagent for the soil washing. These organic acids also led to pH decline and macronutrients losses. Fraction analysis using a sequential extraction procedure showed that the three organic acids targeted and decreased the specifically sorbed (F2) (by 19.3-37.6% and 2.41-23.5%), amorphous iron oxide associated (F3) (by 49.1-61.2% and 51.2-70.2%), and crystallized iron oxide associated (F4) (by 12.3-26.0% and 26.1-29.1%) Sb and As. The leachability of Sb and As, as well as their concentrations and bioconcentration factor (BCF) in vegetables reduced due to the soil washing. It demonstrated that the bioavailability of both the elements was decreased by the organic acids washing. The concentrations of Sb and As in typical vegetable species cultivated in CA washed soil were less than the threshold value for consumption safety, while those in OA and TA washed soils were still higher than the value, suggesting that only CA is a potential washing reagent in soil washing for Sb- and As-contaminated agricultural soil.
期刊：
Journal of Soils and Sediments,2024年24(11):3656-3667 ISSN：1439-0108
通讯作者：
Zhou, DS
作者机构：
[Xiao, Ye; Long, Jiumei; Zhou, Dongsheng] Zunyi Normal Univ, Coll Resources & Environm, Zunyi 563006, Peoples R China.;[Chen, Congli; Han, Nan; Liu, Fangshun; Long, Jiumei; Tan, Yiting; Ouyang, Linzi] Hengyang Normal Univ, Coll Life Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Zhou, DS ] Z;Zunyi Normal Univ, Coll Resources & Environm, Zunyi 563006, Peoples R China.
关键词：
Iron-reducing bacteria;Biochar;Fe(II) dynamic;Secondary iron mineral
摘要：
PurposeThe iron reduction in paddy soils, which is mainly driven by iron-reducing bacteria (IRB) communities is vital for iron and other nutrient supplies and contamination management. This study aimed to investigate biochar effects on the community structure of IRB in paddy soils and the iron reduction driven by them in terms of iron reduction dynamic and secondary iron mineral composition.Materials and methodsWe isolated bacterial iron reduction in paddy soils in a constructed system with the bacteria source from paddy soils and IRB-selective media, with decoupling the effects of complicated geochemical factors from natural environments. Rice straw biochar was added into the iron-reduction system at 1 and 3% rates (referred to as BC1 and BC3). The putative IRB community was analyzed using 16 S rRNA gene sequencing, the dynamic of Fe(II) were tested by ferrozine test method, and the products from bacterial iron reduction were analyzed by XRD and a sequential extraction procedure.Results and discussionBiochar at 1 and 3% (BC1 and BC3) rates notably increased the relative abundance of Bacillota phylum of paddy soils by 52.2 and 55.0% in comparison with control, and decreased Pseudomonadota and Thermodesulfobacteriota significantly. Moreover, BC1 and BC3 markedly increased the relative abundance of a typical hydrogen (H2)-producing genus (Clostridium sensu stricto) by 64.8 and 62.2%, respectively. PCA analysis also showed that putative IRB communities in biochar treatments were significantly different from those in the control. Fe(II) concentrations in BC1 (1.92-10.0 mg/L) and BC3 (3.80-12.4 mg/L) were much higher than those in the control (0.27-0.83 mg/L), implying the enhancement of bacterial iron reduction related to the biochar addition. XRD analysis and sequential extraction showed that siderite was the major secondary iron mineral of bacterial iron reduction due to biochar addition, whereas considerable amounts of ferrihydrite, akaganeite, and magnetite were also observed in the control.ConclusionIt suggests that the increase in Bacillota and Clostridium sensu striction in paddy soils owing to biochar addition is responsible for bacterial iron reduction enhancement. The promotion of iron reduction could facilitate the formation of iron plaque in the rice rhizosphere. Moreover, the high Fe(II) content induced by biochar tends toward Fe(II) oversaturation, resulting in the rapid formation of siderite via precipitation pathways; hence, it is beneficial for heavy metal immobilization in paddy soils through co-precipitation with siderite.
期刊：
Journal of Hazardous Materials,2023年447:130755 ISSN：0304-3894
通讯作者：
Lei, Ming
作者机构：
[Huang, Yayuan; Mensah, Caleb Oppong; Tie, Boqing; Li, Bingyu; Wei, Dongning; Lei, Ming; Zhou, Yimin; Jing, Miaomiao] Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.;[Huang, Yayuan; Mensah, Caleb Oppong; Tie, Boqing; Li, Bingyu; Lei, Ming; Zhou, Yimin; Jing, Miaomiao] Hunan Engn & Technol Res Ctr Irrigat Water Purific, Changsha 410128, Peoples R China.;[Long, Jiumei] Hengyang Normal Univ, Coll Life Sci & Environm, Hengyang 421008, Peoples R China.;[Lei, Ming] 1st Nongda Rd, Changsha, Peoples R China.
通讯机构：
[Ming Lei] C;College of Resource and Environment, Hunan Agricultural University, Changsha 410128, PR China<&wdkj&>Hunan Engineering and Technology Research Center for Irrigation Water Purification, Changsha 410128, PR China
摘要：
Camellia oleifera shell-based activated carbon (COSAC) was prepared by H3PO4 activation method and further used to remove U(VI) from the aqueous solution in a batch system. This research examined the influence of various factors affecting U(VI) removal, including contact time, pH, initial U(VI) concentration, and temperature. The results showed that the U(VI) adsorption capacity and removal efficiency reached 71.28 mg/g and 89.1% at the initial U(VI) concentration of 160 mg/L, temperature of 298 K, pH 5.5, contact time of 60 min, and COSAC dosage of 2.0 g/L. The pseudo-first-order, pseudo-second-order, and intraparticle diffusion equations were used to identify the optimum model that can describe the U(VI) adsorption kinetics. The pseudo-second-order kinetics model performed better in characterizing the adsorption system compared with the pseudo-first-order and intraparticle diffusion models. Isotherm data were also discussed with regard to the appropriacy of Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models. The Langmuir model described the U(VI) adsorption process the best with a maximum adsorption capacity of 78.93 mg/g. Thermodynamic analysis (Delta G(0) < 0, Delta H-0 > 0, and Delta S-0 > 0) indicated that the U(VI) adsorption process is endothermic and spontaneous. All the results imply that COSAC has a promising application in the removal or recovery of U(VI) from aqueous solutions.
作者：
Zhengji Yi;Jian Liu;Xing Liu;Rongying Zeng;Jiumei Long
期刊：
IOP Conference Series: Earth and Environmental Science,2019年330(4):042010 ISSN：1755-1307
作者机构：
College of Chemistry and Materials Science, Hengyang Normal University, Hengyang, 421008, China;Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Hengyang Normal University, Hengyang, 421008, China;[Long J.] College of Life Sciences and Environment, Hengyang Normal University, Hengyang, 421008, China;[Yi Z.; Liu J.; Liu X.; Zeng R.] College of Chemistry and Materials Science, Hengyang Normal University, Hengyang, 421008, China<&wdkj&>Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Hengyang Normal University, Hengyang, 421008, China
会议名称：
2019 International Conference on Advances in Civil Engineering, Energy Resources and Environment Engineering, ACCESE 2019
会议时间：
28 June 2019 through 30 June 2019
关键词：
Adsorption;Biosorption;Dyes;Effluents;Energy resources;Environmental technology;Integral equations;Kinetics;Biosorption capacity;Biosorption kinetics;Biosorption process;Environmental contaminant;Langmuir and freundlich adsorption;Myriophyllum spicatum;Pseudo second order kinetics;Simulated wastewater;Lead compounds
期刊：
Environmental Science and Pollution Research,2019年26(17):17655-17665 ISSN：0944-1344
通讯作者：
Long, Jiumei;Lei, Ming
作者机构：
[Long, Jiumei; Lei, Ming; Tang, Lin; Deng, Sihan; Tan, Di] Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Hunan, Peoples R China.;[Long, Jiumei] Hengyang Normal Univ, Coll Life Sci & Environm, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Long, JM; Lei, M; Long, Jiumei] H;Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Hunan, Peoples R China.;Hengyang Normal Univ, Coll Life Sci & Environm, Hengyang 421008, Hunan, Peoples R China.
关键词：
Dongting Lake area;Geoaccumulation index;Health risk assessment;Heavy metal pollution;Soil-rice system;Translocation
摘要：
Heavy metals including copper (Cu), zinc (Zn), cadmium (Cd), chromium (Cr), lead (Pb), and arsenic (As) were investigated in 89 pairs of rice plant and paddy soils around Dongting Lake area, China. Rice plants and soils were collected with GPS device, and heavy metal contents in different rice plant tissues and soils were measured. The aim of the present study was to assess the heavy metal pollution and translocation in the whole soil-rice system, including the consequent human health risk for residents. According to the indices of average geoaccumulation (Igeo) of the studied elements, paddy soils in study area were moderately polluted by Cd, lowly polluted by Pb, and not polluted by Cu, Zn, Cr, and As. Considering the much higher concentrations of studied elements in roots than in other tissues of rice plants, a great mass of these elements was assumed to be confined in the roots. The low translocation factors from root to shoot (Tfroot-shoot) of all the studied heavy metals (0.04-0.74) underpinned this. The high translocation factors from soil to root (Tfsoil-root) of Cd (9.12), As (4.38), and Zn (2.05) indicated the high bioavailability of these heavy metals for rice plant. The health risk assessment using target hazard quotients (THQs) model indicated that Cd (5.17 for adults and 4.49 for children respectively) and As (3.61 for adults and 3.14 for children respectively) could cause human health risk both for adults and children. Further, given the rate of individual THQ values exceeding one, Cu might also be considered as a potential human health dangerous element in the study area. It was worth noting that as one of the main pollutants, Pb did not show human health risk through rice grain consumption due to its low Tf values in soil-rice system. However, the risk identification of As using comparisons of measured concentrations with risk screening value in Chinese paddy soil standard (GB15618-2018) was not consistent with the human health risk assessment result. This might indicate that site-specific risk screening values of As in China is in demand.
