Improved chromium (VI) reduction performance by bacteria in a biogenic palladium nanoparticle enhanced microbial fuel cell

被引：22

作者：

Matsena, Mpumelelo T. ^{[1
]}

Tichapondwa, Shepherd M. ^{[1
]}

Chirwa, Evans M. N. ^{[1
]}

机构：

[1] Univ Pretoria, Dept Chem Engn, Water Utilisat & Environm Engn Div, ZA-0002 Pretoria, South Africa

来源：

ELECTROCHIMICA ACTA | 2021年 / 368卷

基金：

新加坡国家研究基金会;

关键词：

Microbial fuel cell; Wastewater; Biogenic palladium; Hexavalent chromium reduction; Energy recovery; HEXAVALENT CHROMIUM; POWER-GENERATION; ELECTRICITY PRODUCTION; BIOFILM FORMATION; PD NANOPARTICLES; WASTE-WATER; BIOAUGMENTATION; BIOREDUCTION; ATTACHMENT; PARTICLES;

D O I：

10.1016/j.electacta.2020.137640

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Hexavalent chromium (Cr(VI)) is discharged from several anthropogenic activities that make use or produce Cr(VI) leading to environmental pollution. In this study, we explore an environmentally friendly process for the treatment of Cr(VI) with a codeposition of zero-valent palladium on the anode electrode of a microbial fuel cell (MFC). The MFC featured a granular activated carbon (GAC) anode modified with biogenic palladium nanoparticles (Bio-PdNPs). Temperature, pH, and initial Cr(VI) concentration were first optimized to 38 degrees C, pH 4, and 100 mg L-1 Cr(VI), respectively. Thereafter, the GAC average particle size was successfully optimized to 0.6-1.1 mm which was shown to promote the highest cell attachment. GAC below this size range had minimal cell attachment. The results from the study also showed that the GAC can be successfully modified using Bio-PdNPs to improve the performance of Cr(VI)-reducing MFC with Bio-PdNPs loading of 6 mg Bio-PdNPs g(-1) GAC resulting in peak output potential difference of 393.1 mV, maximum power density of 1965.4 mW m(-3), and complete removal of 100 mg L-1 Cr(VI) in 25 h. (C) 2020 Elsevier Ltd. All rights reserved.

引用

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