硅酸铁钠光催化剂的表面调控及光还原除Cr（Ⅵ）性能研究

doi:10.19964/j.issn.1006-4990.2024-0104

Abstract

Abstract:

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）

CLC Number:

TQ136.11

YAN Yu, ZHOU Wenyuan, YANG Yunfei, WU Junshu, WANG Jinshu, SUN Lingmin. Study on surface regulation of sodium ferric silicate photocatalyst and its enhanced Cr（Ⅵ） photoreduction properties[J]. Inorganic Chemicals Industry, 2024, 56(10): 141-150.

Figures/Tables 9

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样品	原子数分数/%				Fe与Na原子比	Si与O原子比
样品	Fe	Na	Si	O	Fe与Na原子比	Si与O原子比
SFS	7.76	8.11	19.06	65.08	0.957	0.293
SFS-200	8.43	9.11	18.72	63.74	0.925	0.294

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Study on surface regulation of sodium ferric silicate photocatalyst and its enhanced Cr（Ⅵ） photoreduction properties

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