Removal of Cr(VI) by coupled adsorption and photocatalytic degradation based on Ag/ZIF-8/PVDF membrane

被引：0

作者：

Chen, Chunyan ^{[1
]}

Yue, Jiancai ^{[1
]}

Zhou, Jian ^{[2
]}

Liu, Qian ^{[1
]}

Tang, Yaling ^{[1
]}

Chen, Chunlin ^{[1
]}

Xiao, Guoqing ^{[1
,3
,4
]}

机构：

[1] Southwest Petr Univ, Coll Chem & Chem Engn, Chengdu 610500, Sichuan, Peoples R China

[2] Key Lab Harmful Components & Tar Reduct Cigarette, Chengdu 610100, Sichuan, Peoples R China

[3] Oil & Gas Fire Protect Key Lab Sichuan Prov, Chengdu 611731, Sichuan, Peoples R China

[4] Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China

来源：

CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION | 2025年 / 208卷

基金：

中国国家自然科学基金;

关键词：

Absorption; Photocatalytic degradation; Coupled; Deep permeation; Chromium removal; WASTE-WATER; REDUCTION; ZIF-8;

D O I：

10.1016/j.cep.2024.110120

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

In order to reduce the hazard of the heavy metal chromium, the reduction of Cr from Cr(VI) to Cr(III) for further removal was applied in this study. ZIF-8 modified with Ag was used as the photo-catalyst, and adsorption and degradation were further enhanced by deep penetration through in situ growth of Ag/ZIF-8 in the pores of polyvinylidene fluoride (PVDF) membrane. The composite Ag/ZIF-8/PVDF membrane was characterized by XRD, BET, SEM-EDS, UV-Vis and XPS, and the results proved that the nanoparticles of ZIF-8 and Ag were uniformly distributed inside the membrane pores. The removal efficiency of Cr(VI) was enhanced by 78 % after modification of Ag nanoparticles on the ZIF-8 surface, and further enhanced by 68 % after loading the composite particles (Ag/ZIF-8) into the PVDF membrane. Moreover, the removal mechanism was investigated by free radical trapping experiments, and the results showed that O2 center dot- was the main factor in the photo-catalytic process, followed by center dot OH. The results indicated that enhancement of coupled adsorption-degradation process by deep permeation is a feasible approach to improve the heavy metal removal performance due to the dispersive and domain-limiting effects of membrane pores. Ag/ZIF-8/PVDF material is expected to be applied in the field of practical Cr(VI)-containing industrial wastewater treatment.

引用

页数：10

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