A dual-chambered microbial fuel cell with manganese dioxide nano-structured cathode for wastewater treatment.

IF 2.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Nanotechnology Pub Date : 2024-09-30 DOI:10.1088/1361-6528/ad7d7f

Jayanthi Velayudhan, Sangeetha Subramanian

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Abstract

Microbial fuel cells (MFCs) can generate electricity by breaking down organic molecules through sustainable bio-electrochemical processes and wastewater as an energy source. A novel approach to remediate wastewater containing selenite was studied utilizing a selenite-reducing mixed bacterial culture with a nano manganese oxide modified cathode in the MFCs. The modification enhanced electrochemical catalytic activity, extracellular electron transfer rate, chemical oxygen demand (COD) elimination efficiency, and coulombic efficiency. Scanning electron microscopy and energy dispersive x-rays analysis were used to examine a manganese dioxide-coated graphite cathode's surface morphology and chemical composition. The manganese dioxide-coated electrode generated up to 69% higher voltage with 150 ppm selenite concentration than the uncoated graphite electrode. The MFC removed up to 80% of the initial COD of 120 mg l^-1and achieved a maximum power density of 1.51 W m^-2. The study demonstrates that MFCs can effectively treat selenite-containing wastewater, and modifying the cathode can enhance energy production.

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用于废水处理的具有二氧化锰纳米结构阴极的双室微生物燃料电池。

微生物燃料电池可以通过可持续的生物电化学过程分解有机分子来发电，并将废水作为一种能源。研究人员利用硒还原混合细菌培养物和微生物燃料电池中的纳米氧化锰改性阴极，研究了一种修复含硒废水的新方法。这种改性提高了电化学催化活性、细胞外电子转移率、化学需氧量（COD）消除效率和库仑效率。扫描电子显微镜和能量色散 X 射线分析用于研究二氧化锰涂层石墨阴极的表面形态和化学成分。在亚硒酸盐浓度为 150ppm 时，涂有二氧化锰的电极产生的电压比未涂二氧化锰的石墨电极高出 69%。微生物燃料电池可去除 80% 的初始化学需氧量（120 毫克/升），最大功率密度为 1.51 瓦/平方米。这项研究表明，微生物燃料电池可以有效处理含硒废水，而对阴极进行改性可以提高能量生产。

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来源期刊

Nanotechnology 工程技术-材料科学：综合

CiteScore

7.10

自引率

5.70%

发文量

820

审稿时长

2.5 months

期刊介绍： The journal aims to publish papers at the forefront of nanoscale science and technology and especially those of an interdisciplinary nature. Here, nanotechnology is taken to include the ability to individually address, control, and modify structures, materials and devices with nanometre precision, and the synthesis of such structures into systems of micro- and macroscopic dimensions such as MEMS based devices. It encompasses the understanding of the fundamental physics, chemistry, biology and technology of nanometre-scale objects and how such objects can be used in the areas of computation, sensors, nanostructured materials and nano-biotechnology.