Construction of magnetic bimetallic oxide-decorated attapulgite-based adsorbents for arsenic ion adsorption

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-08-09 DOI:10.1002/jctb.7727

Bo Yu, Xiaoning Li, Jiao Ma, Han Yan, Ke Lian, Pengfei Shen

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引用次数: 0

Abstract

BACKGROUND

Arsenic contamination can exert severe detrimental effects on the ecological environment and human health. It can cause acute or chronic poisoning, resulting in cell distortion or cancer when humans come into contact with or consume arsenic-containing water. Adsorption technology is one of the effective methods for arsenic removal. In this study, using attapulgite (ATP) as a support for bimetallic iron–manganese oxides, a series of adsorbents (Fe-Mn/ATP) with different manganese-to-iron molar ratios were prepared via the coprecipitation method. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy mapping, X-ray diffraction and zeta potential measurements were used to analyze the structure and properties of Fe-Mn/ATP. In addition, the adsorption performance of the material for arsenic ions was investigated by static adsorption and dynamic adsorption experiments.

RESULTS

A novel Fe-Mn/ATP adsorbent was prepared using ATP as the raw material and manganese-to-iron molar ratio was 1:3 by coprecipitation at 60 °C for 1 h. The adsorption efficiency of arsenic ions was optimal at an Fe-Mn/ATP dosage of 2 g L⁻¹, pH 4 and a contact time of 10 min, reaching a maximum adsorption capacity of 38.27 mg g⁻¹ at room temperature. The adsorption process followed the pseudo-second-order kinetic model and the Langmuir isotherm adsorption model, indicating that arsenic ion adsorption by Fe-Mn/ATP was mainly monolayer chemical adsorption. Furthermore, Fe-Mn/ATP showed a removal rate for arsenic ions of over 80% after four cycles of regeneration, revealing a great potential for practical application.

CONCLUSION

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构建用于砷离子吸附的磁性双金属氧化物装饰阿塔蓬石基吸附剂

砷污染会对生态环境和人类健康造成严重危害。当人类接触或饮用含砷的水时，会引起急性或慢性中毒，导致细胞畸变或癌症。吸附技术是去除砷的有效方法之一。本研究以阿塔波来石（ATP）作为双金属铁锰氧化物的载体，通过共沉淀法制备了一系列不同锰铁摩尔比的吸附剂（Fe-Mn/ATP）。利用扫描电子显微镜结合能量色散 X 射线光谱图、X 射线衍射和 zeta 电位测量分析了 Fe-Mn/ATP 的结构和性质。以 ATP 为原料，锰-铁摩尔比为 1:3，在 60 ℃ 共沉淀 1 小时，制备了新型铁-锰/ATP 吸附剂。在铁锰/ATP 的用量为 2 g L-1、pH 值为 4、接触时间为 10 分钟时，砷离子的吸附效率最佳，室温下的最大吸附容量为 38.27 mg g-1。吸附过程遵循伪二阶动力学模型和 Langmuir 等温线吸附模型，表明 Fe-Mn/ATP 对砷离子的吸附主要是单层化学吸附。此外，Fe-Mn/ATP 经过四次再生后对砷离子的去除率超过 80%，显示出巨大的实际应用潜力。© 2024 化学工业学会（SCI）。

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.