Thiocyanate Removal from Aqueous Solution by a Synthetic CoAl-Layered Double Hydroxide with Nitrate Intercalation

IF 3.8 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Water, Air, & Soil Pollution Pub Date : 2023-08-23 DOI:10.1007/s11270-023-06593-1

Jingmin Yan, Zhengchen Li, Xiang Liu, Peng Qian, Xikai Liu, Shufeng Ye

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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.

Graphical Abstract

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含硝酸盐插层的合成煤层双氢氧化物去除水中硫氰酸盐

本文采用简单的一步法合成了煤层状双氢氧化物(CoAl-LDH)，并将其用作环境水中硫氰酸盐(SCN−)的吸附剂。表征结果表明，煤- ldh在层间空间中嵌入了NO3−，形成了均匀的纳米板。研究了影响脱除效率的主要因素，结果表明，煤- ldh对SCN -具有较高的脱除效率，适用于较宽的pH和环境温度条件。机理分析表明，煤- ldh吸附SCN−的机理主要包括层间离子交换、静电相互作用和表面配体交换。动力学数据的模型拟合表明，煤- ldh对SCN -的吸附符合拟二阶模型，接触时间为10 min时，SCN -的去除率可达91.4%。Freundlich吸附等温线模型能最准确地描述吸附过程，在25℃、pH 6.0条件下，SCN -的最大吸附值为187 mg/g。同时，废煤- ldh可在Fe(NO3)3溶液中再生，可重复使用4次。综上所述，煤- ldh在去除水溶液中SCN−方面具有很大的应用潜力。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water, Air, & Soil Pollution 环境科学-环境科学

CiteScore

4.50

自引率

6.90%

发文量

448

审稿时长

2.6 months

期刊介绍： 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. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.