Selective removal and simultaneous immobilization of Pb cations from solutions

IF 2.3 4区工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY

Separation Science and Technology Pub Date : 2023-09-30 DOI:10.1080/01496395.2023.2262745

Yunchul Cho, Jing Wang, Sungpyo Kim, Huaibin Zhang, Wenyan Huang, Sridhar Komarneni

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Abstract

ABSTRACTThe aim of this study was to develop a layered ammonium tin phosphate as a potential sorbent for removal of Pb2+ ions by exchange/sorption or other mechanism from contaminated solutions. A layered ammonium tin phosphate (NH4-SnP), δ-SnP – NH4 was synthesized using the hydrothermal process. XRD pattern of the NH4-SnP revealed that the final product obtained was δ-tin (IV) phosphate with the d(001)-spacing of about 14.8 Å containing ammonium ions and water molecules in the interlayers. In order to investigate the removal efficiency of Pb2+ cations by the NH4-SnP, batch-type of sorption experiments were carried out with 2 days of equilibration time at room temperature. Also, the kinetics of reaction was performed at room temperature to determine equilibrium time. The sorption isotherms for Pb2+ cations indicated that NH4-SnP showed high affinity for these ions with all the concentrations used. In addition, kinetic data showed preference for Pb2+ cations between NH4+ cation on the exchanger and Pb2+metal cation in solution. Based on these results, NH4-SnP can be proposed as an excellent sorbent for not only removal but also immobilization of Pb2+ ions from water and wastewater. Pb2+ ions were found to be immobilized as insoluble pyromorphite, Pb5(PO4)Cl after high uptakes.KEYWORDS: Pb2+ reactionPb2+ immobilizationpyromorphitePb2+ isothermδ-tin (IV) phosphate Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis research was supported by the College of Agricultural Sciences under Station Research Project No. PEN04705.

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溶液中Pb阳离子的选择性去除和同时固定化

摘要研究了层状磷酸锡铵作为一种潜在的吸附剂，通过交换/吸附或其他机制去除污染溶液中的Pb2+离子。采用水热法合成了层状磷酸锡铵(NH4- snp)， δ-SnP - NH4。NH4-SnP的XRD图谱显示，最终产物为δ-锡(IV)磷酸，d(001)-间距约为14.8 Å，中间层中含有铵离子和水分子。为了考察NH4-SnP对Pb2+阳离子的去除效果，在室温下进行了间歇式吸附实验，平衡时间为2天。并在室温下进行了反应动力学，确定了反应平衡时间。对Pb2+阳离子的吸附等温线表明，NH4-SnP对Pb2+阳离子具有较高的亲和力。此外，动力学数据表明，交换器上的NH4+阳离子和溶液中的Pb2+金属阳离子更倾向于Pb2+阳离子。基于这些结果，NH4-SnP可以作为一种去除和固定水中Pb2+离子的优良吸附剂。高吸收量后，发现Pb2+离子以不溶性焦闪石Pb5(PO4)Cl固定。关键词:Pb2+反应Pb2+固定化焦闪态epb2 +等温δ-锡(IV)磷酸披露声明作者未报告潜在利益冲突。本研究由农业科学院台站科研项目(No. 1)资助。PEN04705。

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来源期刊

Separation Science and Technology 工程技术-工程：化工

CiteScore

6.10

自引率

3.60%

发文量

131

审稿时长

5.7 months

期刊介绍： This international journal deals with fundamental and applied aspects of separation processes related to a number of fields. A wide range of topics are covered in the journal including adsorption, membranes, extraction, distillation, absorption, centrifugation, crystallization, precipitation, reactive separations, hybrid processes, continuous separations, carbon capture, flocculation and magnetic separations. The journal focuses on state of the art preparative separations and theoretical contributions to the field of separation science. Applications include environmental, energy, water, and biotechnology. The journal does not publish analytical separation papers unless they contain new fundamental contributions to the field of separation science.