Comparative investigation on the adsorption behavior of bromate in aqueous solutions using Zn/Ni/Al-LDH and Ni/Al-LDH: optimization, equilibrium analysis, and mechanistic insights

IF 3 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Journal of Environmental Health Science and Engineering Pub Date : 2025-01-14 DOI:10.1007/s40201-025-00932-6

Yaping Qin, Huixue Ren, Shengyun Jiang, Yuxin Bi, Chuntong Li, Rui Fang

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Abstract

The presence of bromate in water poses a significant health risk. In order to effectively eliminate bromate from water, this study synthesized a series of ternary Zn-Ni-Al layered double hydroxides with varying Zn/Ni/Al atomic ratios using a co-precipitation method. The adsorbents were characterized using various techniques including XRD, Fourier transform infrared spectroscopy, and N₂ adsorption-desorption isotherms. Among them, ZnNiAl-2 exhibited the highest crystallinity and largest specific surface area (316.1 m² g⁻¹), which was compared to the binary hydrotalcite NiAl-LDH for its ability to adsorb bromate from water. Results demonstrated that the adsorption isotherm of bromate on ZnNiAl-2 followed the Langmuir model, with a maximum adsorption capacity of 120.5 mg g⁻¹, significantly higher than that of NiAl at 75.5 mg g⁻¹, indicating strong adsorption capability and reusability performance. The adsorption kinetics were also found to be in accordance with the pseudo-second-order kinetic model. The mechanism involved both surface adsorption and anion exchange.

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Zn/Ni/Al-LDH和Ni/Al-LDH在水溶液中吸附溴酸盐行为的比较研究：优化、平衡分析和机理研究

水中溴酸盐的存在对健康构成重大威胁。为了有效去除水中的溴酸盐，本研究采用共沉淀法合成了一系列具有不同Zn/Ni/Al原子比的Zn-Ni-Al三元层状双氢氧化物。采用XRD、傅里叶变换红外光谱、N2吸附-脱附等温线等技术对吸附剂进行了表征。其中，ZnNiAl-2结晶度最高，比表面积最大（316.1 m2 g−1），其吸附水中溴酸盐的能力优于NiAl-LDH。结果表明，溴酸盐在ZnNiAl-2上的吸附等温线符合Langmuir模型，最大吸附量为120.5 mg g - 1，显著高于NiAl的75.5 mg g - 1，具有较强的吸附能力和重复使用性能。吸附动力学也符合准二级动力学模型。其机理包括表面吸附和阴离子交换。

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来源期刊

Journal of Environmental Health Science and Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES

CiteScore

7.50

自引率

2.90%

发文量

期刊介绍： Journal of Environmental Health Science & Engineering is a peer-reviewed journal presenting timely research on all aspects of environmental health science, engineering and management. A broad outline of the journal''s scope includes: -Water pollution and treatment -Wastewater treatment and reuse -Air control -Soil remediation -Noise and radiation control -Environmental biotechnology and nanotechnology -Food safety and hygiene