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Uranium sorption on oxyhydroxide minerals by surface complexation and precipitation

Chinese Chemical Letters 2022年第7期33卷 3461-3467页

作者： Jingyi Wang Wanqiang Zhou Yanlin Shi Yao Li Dongfan Xian Ning Guo Chunli Liu Beijing National Laboratory for Molecular Sciences Fundamental Science Laboratory on Radiochemistry and Radiation ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

During the chemical weathering of the uranium mill tailings,released uranium could be immobilized by the newly formed secondary minerals such as oxyhydroxides.A deeper understanding of the interaction between uranium and common oxyhydroxides under environmental conditions is *** this work,uranium sorption behaviors on Al-,Mn-and Fe-oxyhydroxide minerals(boehmite,manganite,goethite,and lepidocrocite)were investigated by batch *** showed that the uranium sorption on Al-oxyhydroxide behaved significantly differently from the other three *** sorption edge of the Mn-and Fe-oxyhydroxides located around pH 5,while the sorption edge of boehmite shifted about 1.5 pH unit to near *** sorption isotherms of uranium on manganite,goethite and lepidocrocite at pH 5.0 could be well fitted by the Langmuir *** of surface complexation,sorption on boehmite happened mainly by uranium-bearing carbonates and hydroxides precipitation as illustrated by the characterization *** carbonate and phosphate strongly affected the uranium sorption *** removal efficiency of uranium by boehmite exceeded 98%after three sorption-desorption cycles,indicating it may be a potential material for uranium removal and recovery.

关键词： Uranium mill tailings Oxyhydroxides Uranium sorption surface complexation surface precipitation

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Interactions of organic phosphorus with soil minerals and the associated environmental impacts: A review

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Pedosphere 2023年第1期33卷 74-92页

作者： Yupeng YAN Biao WAN Rui JIANG Xiaoming WANG Hui WANG Shuai LAN Qin ZHANG Xionghan FENG Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province College of Land Resources and EnvironmentJiangxi Agricultural UniversityNanchang 330045China Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River) Ministry of Agriculture and Rural AffairsCollege of Resources and EnvironmentHuazhong Agricultural UniversityWuhan 430070China Geomicrobiology Center for Applied GeosciencesUniversity of TuebingenTuebingen 72076Germany Soil and Fertilizer Institute Anhui Academy of Agricultural SciencesHefei 230001China

As an important part of the soil phosphorus(P)pool,organic P(OP)is widely found in terrestrial and aquatic environments(e.g.,soils and sediments).The interfacial behavior of OP on natural minerals affects the transport,transformation,and bioavailability of P in the *** paper reviews the processes involving adsorption-desorption,dissolution-precipitation,and enzymatic/mineral-mediated hydrolysis of OP at the mineral-water interface,and their subsequent effects on OP speciation and mineral colloidal stability/*** sorption mechanisms of OP on natural minerals mainly include surface complexation and precipitation,which are controlled by factors such as mineral identity and crystallinity,the relative molecular weight of OP,reaction pH,ionic strength,temperature,and co-existing ligands or *** desorption amount and rate of OP from minerals are determined by the mineral identity,desorbent type,pre-sorption time,OP species,reaction pH,number of desorption cycles,and redox *** interactions between OP and minerals affect the sorption of co-existing metal ions and the stability of the *** effect of minerals on the enzymatic hydrolysis of OP sorbed on mineral surfaces depends on the mineral identity and OP *** minerals also exhibit catalytic activity to promote the cleavage of C–O–P bonds and OP *** provide an overview of state-of-the-art techniques currently applied in environmental OP *** main challenges and future research directions are also summarized to further explore OP interactions with natural minerals in complex environmental settings.

关键词： hydrolysis interfacial reactions natural minerals sorption surface complexation surface precipitation

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Lead Removal from Aqueous Solutions Using Novel Gel Adsorbent Synthesized from Natural Condensed Tannin

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Chinese Journal of Chemical Engineering 2003年第4期11卷 426-430页

作者：占新民赵璇 AKANE Miyazaki YOSHIO Nakano State Key Joint Laboratory on Environment Simulation and Pollution Control Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China Section of Environmental Technology Institute of Nuclear Energy Technology Tsinghua University Beijing 100084China Department of Environmental Chemistry and Engineering Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology Nagatsuta 4259 Midori-ku Yokohama 226-8502 Japan

Lead has caused serious environmental pollution due to its toxicity, accumulation in food chains and persistence in nature. In this paper, removal of lead from aqueous solutions is investigated using a novel gel adsorbent synthesized from natural condensed tannin. The novel adsorbent performs in aqueous solutions as a weak base with valid basic groups of 1.2mmol·g-1 tannin gel particles and therefore results in the elevation of pH value of aqueous solutions. Even when initial pH is 3.6, final pH at equilibrium can climb up to 6.5 that is above the pH value for Pb(OH)2 precipitation formation and then lead can be removed from wastewater by this so-called surface precipitation. The adsorption isotherm can be expressed by the Langmuir equation and the maximum capacity for adsorption of Pb is up to 92 mg·g-1 (based on dry adsorbent) when initial pH value is 3.6. Hence, the adsorbent does offer favorable properties in lead removal with respect to its high adsorption capacity at low initial pH value, which is advantageous to lead removal from acidic wastewater. A model is put forward to describe the individual adsorption phenomenon of the tannin gel adsorbent.

关键词： condensed tannin lead removal surface precipitation tannin gel adsorbent

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