{"title":"Thiocyanate Removal from Aqueous Solution by a Synthetic CoAl-Layered Double Hydroxide with Nitrate Intercalation","authors":"Jingmin Yan, Zhengchen Li, Xiang Liu, Peng Qian, Xikai Liu, Shufeng Ye","doi":"10.1007/s11270-023-06593-1","DOIUrl":null,"url":null,"abstract":"<div><p>In this work, CoAl-layered double hydroxide (CoAl-LDH) was synthesized by a facile one-step process and utilized as an adsorbent for the removal of thiocyanate (SCN<sup>−</sup>) from environmental water. The characterization results revealed that CoAl-LDH presents a homogeneous nanosized plate with intercalation of NO<sub>3</sub><sup>−</sup> in the interlayer space. The main factors affecting the removal efficiencies were investigated, and results revealed that CoAl-LDH possessed high removal efficiencies for SCN<sup>−</sup> and was suitable for a wide range of pH and ambient temperature conditions. Furthermore, the results of the mechanism analysis revealed that the mechanism of adsorption of SCN<sup>−</sup> by CoAl-LDH mainly includes interlayer ion exchange, electrostatic interactions, and surface ligand exchange. Model fitting of the kinetic data showed that SCN<sup>−</sup> sorption on CoAl-LDH followed the pseudo-second-order model and the removal rate of SCN<sup>−</sup> could reach 91.4% with 10 min contact time. Freundlich adsorption isotherm model could describe the adsorption process most accurately, and the maximum adsorption values of SCN<sup>−</sup> were 187 mg/g at 25℃ and pH 6.0. Meanwhile, the spent CoAl-LDH could be regenerated in Fe(NO<sub>3</sub>)<sub>3</sub> solution and was reused up to four cycles. The overall results demonstrate that CoAl-LDH had a great application potential in the removal of SCN<sup>−</sup> from aqueous solution.</p><h3>Graphical Abstract</h3>\n <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\n </div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"234 9","pages":""},"PeriodicalIF":3.8000,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Water, Air, & Soil Pollution","FirstCategoryId":"6","ListUrlMain":"https://link.springer.com/article/10.1007/s11270-023-06593-1","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
In this work, CoAl-layered double hydroxide (CoAl-LDH) was synthesized by a facile one-step process and utilized as an adsorbent for the removal of thiocyanate (SCN−) from environmental water. The characterization results revealed that CoAl-LDH presents a homogeneous nanosized plate with intercalation of NO3− in the interlayer space. The main factors affecting the removal efficiencies were investigated, and results revealed that CoAl-LDH possessed high removal efficiencies for SCN− and was suitable for a wide range of pH and ambient temperature conditions. Furthermore, the results of the mechanism analysis revealed that the mechanism of adsorption of SCN− by CoAl-LDH mainly includes interlayer ion exchange, electrostatic interactions, and surface ligand exchange. Model fitting of the kinetic data showed that SCN− sorption on CoAl-LDH followed the pseudo-second-order model and the removal rate of SCN− could reach 91.4% with 10 min contact time. Freundlich adsorption isotherm model could describe the adsorption process most accurately, and the maximum adsorption values of SCN− were 187 mg/g at 25℃ and pH 6.0. Meanwhile, the spent CoAl-LDH could be regenerated in Fe(NO3)3 solution and was reused up to four cycles. The overall results demonstrate that CoAl-LDH had a great application potential in the removal of SCN− from aqueous solution.
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Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments.
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Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.
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