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Mechanistic insight into Cr(Ⅵ)retention by Si-containing ferrihydrite

Journal of Environmental Sciences 2024年第5期139卷 217-225页

作者： Ying Hu Qiang Xue Honghan Chen huaming guo Kenneth C.Carroll Song Wang MOE Key Laboratory of Groundwater Circulation and Environmental Evolution School of Water Resources and EnvironmentChina University of Geosciences(Beijing)Beijing 100083China Beijing Key Laboratory of Water Resources and Environmental Engineering School of Water Resources and EnvironmentChina University of GeosciencesBeijing 100083China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesBeijing 100083China Plant&Environmental Science New Mexico State UniversityNM 88003USA Institute of Theoretical Chemistry College of ChemistryJilin UniversityChangchun 130023China

Hexavalent chromium[Cr(Ⅵ)]causes serious harm to the environment due to its high toxicity,solubility,and ***(Fh)are the main adsorbent and trapping agent of Cr(Ⅵ)in soils and aquifers,and they usually coexist with silicate(Si),forming Si-containing ferrihydrite(Si-Fh)***,the mechanism of Cr(Ⅵ)retention by Si-Fh mixtures is poorly *** this study,the behaviors and mechanisms of Cr(Ⅵ)adsorption onto Si-Fh with different Si/Fe molar ratios was *** electron microscope,Fourier transform infrared spectroscopy,X-ray diffraction,X-ray photoelectron spectroscopy,and other techniques were used to characterize Si-Fh and Cr(Ⅵ)-loading of *** results show that specific surface area of Si-Fh increases gradually with increasing Si/Fe ratios,but Cr(Ⅵ)adsorption on Si-Fh decreases with increasing Si/Fe *** is because with an increase in Si/Fe molar ratio,the point of zero charge of Si-Fh gradually decreases and electrostatic repulsion between Si-Fh and Cr(Ⅵ)***,the complexation of Cr(Ⅵ)is enhanced due to the increase in adsorbed hydroxyl(A-OH-)on Si-Fh with increasing Si/Fe molar ratio,which partly counteracts the effect of the electrostatic ***,the increase in the electrostatic repulsion has a greater impact on adsorption than the additional complexation with *** functional theory calculation further supports this observation,showing the increases in electron variation of bonding atoms and reaction energies of inner spherical complexes with the increase in Si/Fe ratio.

关键词： Hexavalent chromium Ferrihydrite Si/Fe ratio Cr(Ⅵ)Adsorption

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基于K_(d)的某酸法地浸铀矿山地下水铀运移模拟

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地学前缘 2024年第3期31卷 381-391页

作者：杨冰孟童郭华明连国玺陈帅瑶杨曦中核第四研究设计工程有限公司河北石家庄050021 中国地质大学(北京)生物地质与环境地质国家重点实验室北京100083 中国石油天然气股份有限公司河北石家庄050000

地浸铀矿山地下水U污染问题是国际社会广泛关注的环境地质问题,准确预测地浸铀矿山采区外围地下水中U的运移范围对辐射风险评估至关重要。本文以我国某酸法地浸铀矿山为研究对象,利用数值模拟方法定量模拟和预测了不同生产时间地下水中... 详细信息

地浸铀矿山地下水U污染问题是国际社会广泛关注的环境地质问题,准确预测地浸铀矿山采区外围地下水中U的运移范围对辐射风险评估至关重要。本文以我国某酸法地浸铀矿山为研究对象,利用数值模拟方法定量模拟和预测了不同生产时间地下水中U的运移范围。数值模拟结果表明,地浸生产会明显改变采区流场形态,形成指向采区内部的水力梯度,生产井的抽注是改变流场形态的主控因素。在流场模拟的基础上,建立了不考虑吸附作用的地下水U运移模型与基于K_(d)值的U阻滞运移模型。根据采区内生产井及采区外围不同距离处监测井地下水pH情况,对阻滞运移模型中的K_(d)进行了分区赋值。对比两个模型的模拟结果可以发现,当考虑含水介质对地下水中U的吸附阻滞作用后,模拟结果能够跟现场监测数据更好拟合,表明地浸采区外围地下水中U的运移范围受含水介质的吸附阻滞作用明显;这种情况下,U在地下水中的运移距离缩短了53%,运移范围缩小了41%;阻滞运移模型预测的投产5年后采区外围地下水中U迁移距离为50 m。该结果与现场监测结果基本一致,证明数值模拟手段可以为地浸铀矿山地下水U分布范围预测提供科学依据。

关键词：地浸铀矿山地下水环境数值模拟溶质运移

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沉积物中砷的赋存特征及对地下水砷富集的控制:以内蒙古河套盆地为例

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中国地质 2024年第4期51卷 1331-1341页

作者：张卓郭华明韩双宝牛笑童中国地质调查局天津地质调查中心(华北地质科技创新中心) 天津300170 天津市海岸带地质过程与环境安全重点实验室天津300170 中国地质大学(北京)生物地质与环境地质国家重点实验室北京100083 中国地质调查局水文地质环境地质调查中心河北保定071051

【研究目的】河套盆地西侧存在原生高砷地下水,查明含水层沉积物中砷的空间分布和赋存特征,分析地下水砷的富集机理,有利于保障当地居民用水安全。【研究方法】本研究在河套盆地山前冲洪积扇区的钻孔K02和河套盆地平原区的钻孔K01中分... 详细信息

【研究目的】河套盆地西侧存在原生高砷地下水,查明含水层沉积物中砷的空间分布和赋存特征,分析地下水砷的富集机理,有利于保障当地居民用水安全。【研究方法】本研究在河套盆地山前冲洪积扇区的钻孔K02和河套盆地平原区的钻孔K01中分别采集25和26个沉积物样品,用于分析岩性特征与地球化学组分,并开展砷的分步提取与解吸附实验。【研究结果】山前冲洪积扇区含水层处于相对氧化的环境中,而平原区含水层处于封闭的还原环境中。后者沉积物电导率普遍高于前者,两者沉积物电导率随深度均有递减趋势。山前冲洪积扇区和平原区沉积物总固相砷含量相差不大,但固相砷的赋存形态差别较大,前者沉积物固相砷以无定形态的铁氧化物或氢氧化物共存的砷为主,后者则以强吸附态砷为主。【结论】沉积物中砷赋存特征的差异是造成平原区地下水砷浓度高于山前冲洪积扇区的主要原因。解吸附实验表明弱碱性环境或高Na/Ca^(0.5)摩尔比值均能促进砷的解吸附,导致地下水中砷的富集。

关键词：沉积物固相砷赋存特征水文地质调查工程河套盆地内蒙古

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陕北靖边高铬地下水中硝酸根分布及来源

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地学前缘 2024年第1期31卷 384-399页

作者：郭华明尹嘉鸿严松刘超中国地质大学(北京)地下水循环与环境演化教育部重点实验室北京100083 中国地质大学(北京)水资源与环境学院北京100083

天然高铬地下水通常含有较高浓度的硝酸根,然而高铬地下水中硝酸根来源及其联系却并不清楚。本文以陕北黄土高原靖边西南地区的高铬地下水为研究对象,采集了不同深度的地下水和沉积物样品,并测试了地下水样品中的溶解Cr、主要阴阳离子、... 详细信息

天然高铬地下水通常含有较高浓度的硝酸根,然而高铬地下水中硝酸根来源及其联系却并不清楚。本文以陕北黄土高原靖边西南地区的高铬地下水为研究对象,采集了不同深度的地下水和沉积物样品,并测试了地下水样品中的溶解Cr、主要阴阳离子、δ^(18)O、δD、δ^(18)O-NO_(3)、δ^(15)N-NO_(3)等以及沉积物的主要组分和可溶性组分。研究结果表明,研究区地下水的水化学组分主要受水文地质条件的影响。第四系黄土潜水水化学类型主要为HCO_(3)-Na型和HCO_(3)-Ca-Mg型;白垩系环河组、洛河组砂岩承压水水化学类型复杂,主要为HCO_(3)-SO_(4)-Cl-Na-Mg型、HCO_(3)-SO_(4)-Na-Mg型、SO_(4)-Cl-Na-Mg型,地下水处于偏碱性、氧化的环境,具有较高的可溶盐含量。潜水的水化学组分主要来自含水层中硅酸盐风化;承压水水化学组分主要来源于蒸发盐的溶解。垂向上,承压水中硝酸根的平均浓度高于潜水和地表水;地下水硝酸根浓度超标率在研究区从东北到西南呈现高-低-高的趋势;沉积物中可溶性硝酸根与地下水样品在深度上具有相似的变化规律,表明地下水硝酸根主要来源于沉积物。δ^(18)O-NO_(3)和δ^(15)N-NO_(3)结果表明,硝化反应是研究区氮素循环转化的主要过程。在偏碱性氧化性地下水环境中,受溶解氧、硝酸根和硝化反应等多种因素的共同作用,铬趋于从岩石中氧化溶解,迁移进入地下水中。

关键词：地下水硝酸根六价铬水文地球化学氮氧同位素

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Groundwater arsenic biogeochemistry-Key questions and use of tracers to understand arsenic-prone groundwater systems

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Geoscience Frontiers 2019年第5期10卷 1635-1641页

作者： David A. Polya Charlotte Sparrenbom Saugata Datta huaming guo School of Earth and Environmental Sciences and Williamson Research Centre for Molecular Environmental Science The University of ManchesterWilliamson BuildingOxford RoadManchesterM13 9PLUK Department of Geology Lund UniversityLundSweden Department of Geology Kansas State University108 Thompson HallManhattanKS66506-3201USA State Key Laboratory of Biogeology and Environmental Geology and School of Water Resources China University of GeosciencesBeijing 100083China

Over 100,000,000 people worldwide are exposed to high arsenic groundwater utilised for drinking or *** consequent global avoidable disease burden is estimated to be of the order of 100,000 avoidable deaths or more per annum from just direct exposures - *** indirect exposure (from rice and other foods) and excluding *** 1000s of papers published on arsenic (hydro)(bio)geochemistry,there remain a number of key outstanding questions to be addressed in relation to arsenic geoscience - these include questions related to:(i) the role of human activities - irrigation,agriculture and other land uses - on arsenic mobilisation in groundwaters;(ii) the specific sources,nature and role of organics,minerals and microbial communities involved in arsenic mobilisation;(iii) the relationship to microscopic to macroscopic scale geological (including tectonic) and evolution processes;(iv) unravelling the over-printing of multiple processes in complex highly heterogeneous aquifer systems and (v) using increasing understanding of the controls of arsenic mobility in groundwaters systems to informing improved locally-relevant remediation and mitigation *** article further summarises how the 9 further papers in this Special Issue address some of these questions through the use of chemical and/or isotopic tracers.

关键词： Arsenic Groundwater Biogeochemical cycles Tracers

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Spatial and temporal evolutions of groundwater arsenic approximately along the flow path in the Hetao basin, Inner Mongolia

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Chinese Science Bulletin 2013年第25期58卷 3070-3079页

作者： guo huaming ZHANG Yang JIA YongFeng ZHAO Kai KIM Kangjoo State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences School of Water Resources and Environment China University of Geosciences Department of Environmental Engineering Kunsan National University

Patchy distribution of high As groundwater has normally been observed in As-affected areas. Spatial and temporal evolutions help in better understanding mechanisms of As mobilization and in developing effective strategies for ensuring drinking water safety. Four multilevel samplers were installed approximately along the groundwater flow path to investigate spatial and temporal variations in groundwater As in the Hetao basin, Inner Mongolia. Both water chemistry and groundwater level were monitored for about two years. Groundwater As concentration generally showed increasing trends, and Eh values showed decreasing trends along the flow path, indicating that As was mobilized via reductive dissolution of Fe oxides. However, in evaporation discharge area, shallow groundwater As was generally lower than those upstream and downstream. In addition to evaporation, siderite and pyrite precipitations controlled groundwater As concentrations. The negative correlations between As concentration and SIpyrite (or SIsiderite) implied that siderite and pyrite precipitations wold scavenge groundwater As and lower As concentration. Temporal variation showed different trends in different locations. It may reflect replenishment of high/low As groundwater for the increase/decrease in As concentrations, resulting from water level fluctuation. The increase trends in groundwater As concentrations at depth around 15m in the discharge areas would result from the increase in the recharge of underlying groundwater (20m) with high As concentration due to enhanced evaporation in the seasons with high water levels. The investigation suggested that monitoring of groundwater As should be routinely carried out to ensure the drinking water safety in the As-affected areas.

关键词：地下水流流动路径河套盆地内蒙古高砷时间演化空间

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Modeling transport of arsenic through modified granular natural siderite filters for arsenic removal

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Geoscience Frontiers 2019年第5期10卷 1755-1764页

作者： Fulan Li huaming guo Kai Zhao Wei Xiu Jiaxing Shen Yi Chen State Key Laboratory of Biogeology and Environmental Geology MOE Key Laboratory of Groundwater Circulation and Environment EvolutionChina University of Geosciences (Beijing)Beijing 100083China School of Water Resources and Environment China University of Geosciences (Beijing)Beijing 100083China China Institute for Geo-environmental Monitoring Beijing 100081China

Groundwater arsenic (As) contamination is a hot issue,which is severe health concern ***,many Fe-based adsorbents have been used for As removal from *** granular natural siderite (MGNS),a special hybrid Fe(II)/Fe(III) system,had higher adsorption capacity for As(III) than As(V),but the feasibility of its application in treating high-As groundwater is still *** combination with transport modeling,laboratory column studies and field pilot tests were performed to reveal both mechanisms and factors controlling As removal by MGNS-filled *** show that weakly acid pH and discontinuous treatment enhanced As(III) removal,with a throughput of 8700 bed volumes (BV) of 1.0 mg/L As(III) water at breakthrough of 10 mg/L As at pH *** HCO3^- inhibited As removal by the *** mineral species,SEM and XRD patterns of As-loading MGNS show that the important process contributing to high As(III) removal was the mineral transformation from siderite to goethite in the *** homogeneous surface diffusion modeling (HSDM) shows that competition between As(III) and HCO3^- with adsorption sites on MGNS was *** inhibition of HCO3^- on As(III) removal was connected to inhibition of siderite dissolution and mineral *** loadings were lower in field pilot tests than those in the laboratory experiments,showing that high concentrations of coexisting anions (especially HCO3^-- and SiO4^4-),high pH,low EBCT,and low groundwater temperature decreased As *** was suggested that acidification and aeration of high- As groundwater and discontinuous treatment would improve the MGNS filter performance of As removal from real high-As groundwater.

关键词： Arsenite (As) Adsorption Mineral transformation Column Groundwater

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Evolution of Groundwater Major Components in the Hebei Plain: Evidences from 30-Year Monitoring Data

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Journal of Earth Science 2014年第3期25卷 563-574页

作者： Yanhong Zhan huaming guo Yu Wang Ruimin Li Chuntang Hou Jingli Shao Yali Cui MOE Key Laboratory of Groundwater Circulation and Evolution China University of Geosciences School of Water Resources and Environment China University of Geosciences China Institute of Geo-environment Monitoring Institute of Geo-mechanics Chinese Academy of Geological Sciences

Groundwater is the main water source in the Hebei Plain. Evolution of groundwater chemistry can not only provide scientific data for sustainable usage of groundwater resources, but also help us in better understanding hydrogeochemical processes in aquifers. Spatial distribution and temporal evolution were analyzed on basis of monitoring data between 1975 and 2005. Results showed that major components in groundwater had increasing trends since 1970s. Major components in shallow groundwater increased more than those in deep one. In shallow groundwater of piedmont alluvial fan-recharge zone, concentrations of Na＋, Ca2＋, SO42- had great increasing trends, while other major components increased by less than 30%. There were great increasing trends in Na＋, Cl-, SO42- concentrations in deep groundwater of central alluvial plain-intermediate zone, while other major components increased by no more than 20%. Deep groundwater from coast plain-discharge zone and piedmont alluvial fan-recharge zone showed no significant variations in major ion concentrations. In shallow groundwater, dissolution, evaporation and human activities played a major role in the increase in major components. However, groundwater mixture resulting from deep groundwater exploitation was believed to be the major factors for the increases in major components in deep groundwater of central alluvial plain-intermediate zone.

关键词： Hebei Plain groundwater major component water-rock interaction evolution temporal spatial.

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Effect of Aqueous Colloids on Arsenic Geochemistry:Evidences from Ultrafiltration of High Arsenic Groundwater in the Hetao Basin,Inner Mongolia

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地学前缘 2009年第S1期16卷 20-21页

作者： Bo Zhang,huaming guo School of Water Resources & Environment,China University of Geosciences(Beijing),Beijing 100083,China.

Groundwater colloidal particles are believed to affect element geochemical behavior in groundwaters, which would mobilize trace element in the groundwater *** of As geochemisttry as impacted by colloids was carried out by using ultrafiltration technology in the Hetao basin,Inner *** groundwater sampling points have been chosen,including five with high As concentration (>100μg/L) and one with low As concentra-

关键词： As mobilization hydrogeochemistry particle dissolved organic carbon inorganic colloid

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Batch and Column Experiments on Fluoride Removal from Waters Using Modified Zeolite

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Journal of Earth Science 2000年第3期19卷 77-80页

作者： guo huaming Wang Yanxin Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

High fluoride groundwater occurs widely in China, presenting a quite serious environmental problem. Zeolite from Xinyang, China was tested as the fluoride removing adsorbent. Batch and column experiments on fluoride removal using modified zeolites treated with hydrochloric acid, sodium hydroxide, sodium chloride and ferric chloride, respectively show that 0.1 mol/L HCl modified zeolite can be used as an adsorbent for fluoride, with an adsorption capacity of 173.16 mg/kg.

关键词： batch and column experiments fluorid removal zeolite groundwater.

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