利用 CoFe2O4/SiO2/MnO2 磁性纳米复合材料作为新型光催化剂在模拟阳光下去除 Cr (VI) 的吸附-光催化过程综合研究：等温线、动力学和热力学研究

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

Journal of Environmental Health Science and Engineering Pub Date : 2022-01-25 DOI:10.1007/s40201-021-00763-1

Hadigheh Dorri, Ali Zeraatkar Moghaddam, Ebrahim Ghiamati, Behnam Barikbin

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引用次数: 1

摘要

目的本研究旨在探讨 CoFe2O4/SiO2/flower-like MnO2 纳米粒子作为铬（六价铬）吸附-光催化过程催化剂的效率。方法首先合成所使用的磁性纳米复合材料，然后使用 TEM、SEM、EDX、XRD、FTIR、XRF 和 BET 等先进技术对其进行表征。采用批量吸附法去除铬 (VI)，样品 pH 值（A；2-6）、初始铬酸盐浓度（B；50-100 ppm）和吸附剂重量与样品体积比（C；1-3 mg ml-1）、孔清除剂（0.1 -0.结果 CoFe2O4/SiO2/MnO2 复合材料的吸附-光催化性能很高，在最佳条件下（即 pH = 3、催化剂浓度 = 0.即 pH = 3，催化剂浓度 = 2 mg L-1，六价铬浓度 = 200 mg L-1，空穴清除剂浓度 = 0.4% (w/v)，实验室温度，转速 = 400 rpm，紫外线辐射）。结果表明，合成的 CoFe2O4/SiO2/MnO2 磁性纳米复合材料极有可能用作光催化剂，在吸附反应中去除六价铬。它可作为一种有效的催化剂用于消除废水中的六（Cr）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

A comprehensive study on the adsorption-photocatalytic processes using CoFe2O4/SiO2/MnO2 magnetic nanocomposite as a novel photo-catalyst for removal of Cr (VI) under simulated sunlight: Isotherm, kinetic and thermodynamic studies

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Purpose

The present study aimed to investigate the efficiency of CoFe₂O₄/SiO₂/flower-like MnO₂ nanoparticles as a catalyst for Cr (VI) adsorption-photocatalytic processes.

Methods

The magnetic nanocomposite used was first synthesized and then characterized using TEM, SEM, EDX, XRD, FTIR, XRF and BET advanced techniques. The removal of the Cr (VI) was performed through a batch adsorption approach and the effects of sample pH (A; 2–6), initial chromate concentration (B; 50–100 ppm) and adsorbent weight to sample volume ratio (C; 1–3 mg ml⁻¹), hole scavenger (0.1 -0.3%w/v) and time (E; 30–60 min), to evaluate the individual and interactive effects under ultraviolet light conditions, were also studied by the central composite design in the photocatalytic process of adsorption.

Results

The adsorption-photocatalytic performance of the CoFe₂O₄/SiO₂/MnO₂ composite was high in which 98.1% of Cr(VI) after 30 min of photocatalytic treatment in optimum conditions (i.e. pH = 3, catalyst concentration = 2 mg L⁻¹, Cr(VI) concentration = 200 mg L⁻¹, and hole scavenger concentration = 0.4% (w/ v), At laboratory temperature, speed = 400 rpm, under UV radiation).Under optimum conditions, Cr(VI) reductive followed pseudo—second—order kinetics and followed the Langmuir and Temkin isotherms, also, positive value of ΔH° indicates endothermic nature.

Conclusions

The results showed that the synthesized CoFe₂O₄/SiO₂/MnO₂ magnetic nanocomposite holds a great potential for use as a photocatalyst to remove Cr (VI) in adsorption reactions. It can be used as an effective catalyst in the eradication of Cr (VI) wastewater.

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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