收稿日期: 2024-02-28
网络出版日期: 2024-03-27
基金资助
国家自然科学基金项目(52172290)
Study on surface regulation of sodium ferric silicate photocatalyst and its enhanced Cr（Ⅵ） photoreduction properties
Received date: 2024-02-28
Online published: 2024-03-27
绿色、价廉、稳定的硅酸盐类光催化剂是当前研究热点之一。硅酸铁钠（NaFeSi2O6，SFS）是一种链式硅酸盐，组成元素简单，能够吸收可见光，因而受到人们的关注。首先通过水热方法合成原始SFS粉末，而后经热还原过程调控SFS表面的微结构与Fe（Ⅲ）/Fe（Ⅱ）比率，制备出最优的改性SFS用于Cr（Ⅵ）还原。研究发现，经过200 ℃热还原之后的SFS-200，比表面积增大了43%、孔体积增大到0.081 cm3/g、Fe（Ⅱ）占比从33%提高到45%，显著提高了其对Cr（Ⅵ）的催化还原活性。同时，探究了SFS-200催化剂用量、还原时间、草酸助剂用量、Cr（Ⅵ）浓度等因素对催化性能的影响。分析发现，催化体系中Fe（Ⅱ）-C2O4•-是主要活性物质，维持Fe（Ⅲ）-Fe（Ⅱ）的化学循环以增强SFS-200的Cr（Ⅵ）高效光还原去除能力。该研究提供了一条制备高性能硅酸铁钠光催化剂用于Cr（Ⅵ）污水净化的有效途径，具有较大的应用潜力。
严钰 , 周文元 , 杨韵斐 , 吴俊书 , 王金淑 , 孙领民 . 硅酸铁钠光催化剂的表面调控及光还原除Cr（Ⅵ）性能研究[J]. 无机盐工业, 2024 , 56(10) : 141 -150 . DOI: 10.19964/j.issn.1006-4990.2024-0104
Silicate⁃based catalysts have become the focus of current research because of their green，low⁃cost and stable characteristics.Sodium ferric silicate（NaFeSi2O6，SFS） is a chain silicate with simple composition and ability to absorb visible light，which has attracted people's attention.Firstly，the original SFS powder was synthesized by hydrothermal method，and then the microstructure and Fe（Ⅲ）/Fe（Ⅱ） ratio of the SFS surface were regulated by thermal reduction process to prepare the optimal modified SFS for Cr（Ⅵ） reduction.It was found that after thermal reduction at 200 ℃，the specific surface area of SFS-200 was increased by 43%，the pore volume was increased to 0.081 cm3/g，and the proportion of Fe（Ⅱ） was increased from 33% to 45%，significantly improving its catalytic reduction activity towards Cr（Ⅵ）.Meanwhile，the effects of SFS-200 catalyst dosage，reduction time，oxalic acid promoter dosage，Cr（Ⅵ） concentration，and other factors on catalytic performance were investigated.It was found that Fe（Ⅱ）-C2O4•- was the main active substance in the catalytic system，maintaining the chemical cycle of Fe（Ⅲ）-Fe（Ⅱ） to enhance the efficient photo reduction removal ability of Cr（Ⅵ） by SFS-200.This study provided an effective way to prepare high⁃performance sodium ferric silicate photocatalyst for Cr（Ⅵ） wastewater purification，which had great potential for application.
Key words： sodium ferric silicate; photocatalysis; Cr（Ⅵ）
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