Effects of Ni nanoparticles, MWCNT, and MWCNT/Ni on the power production and the wastewater treatment of a microbial fuel cell
Effects of Ni nanoparticles, MWCNT, and MWCNT/Ni on the power production and the wastewater treatment of a microbial fuel cell
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DOI：
10.1080/15435075.2019.1671412
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发表时间：
2019-10-04
影响因子：
3.3
通讯作者：
Liu, Jia
中科院分区：
文献类型：
--
作者：
Aryal, Ramesh A.;Beltran, Diana;Liu, Jia
首次比较了镍纳米颗粒（NP）、多壁碳纳米管（MWCNT）和MWCNT/Ni在提高两室微生物燃料电池（MFC）发电和废水处理效率方面的效果。阴极电极 ? 3D 碳纤维刷？首次使用不同数量的三种纳米材料进行修饰。记录电池的闭路电压，并测量阳极溶液的化学需氧量（COD）随时间的变化。 MFC的整体性能按以下顺序增强：MWCNT > MWCNT/Ni > Ni。使用1.5 mg/cm(2)的MWCNT时，发电量增加了7.9倍，达到1.2 W/m(3)。当MWCNT浓度为3.0 mg/cm(2)时，功率密度进一步增加至1.9 W/m(3)，24小时内COD最大降低163.3 mg/L。内阻最大下降65.2%至0.4k?具有 1.5 mg/cm(2) 的 MWCNT/Ni，并进一步达到 0.3 k？具有 3.0 mg/cm(2) 的 MWCNT/Ni。电化学阻抗谱（EIS）用于评估不同纳米材料对 MFC 阻抗的影响。阴极的电荷转移电阻最大程度降低了约85%至0.3Ω。具有 3.0 mg/cm(2) 的 MWCNT/Ni。综合考虑价格、稳定性和性能，多壁碳纳米管是最实用的正极改性材料。这项研究通过在 MFC 阴极上应用低成本纳米材料来提高废水处理过程中的能源产量，对可持续废水处理具有重要意义。
Ni nanoparticles (NPs), multi-walled carbon nanotubes (MWCNT), and MWCNT/Ni were compared for the first time in enhancing power production and wastewater treatment efficiency of a two-chambered microbial fuel cell (MFC). The cathode electrode ? a 3D carbon fiber brush ? was modified for the first time using different amounts of the three types of nanomaterials. Closed-circuit voltage of the cell was recorded, and chemical oxygen demand (COD) of the anode solution was measured with time. The overall performance of the MFC was enhanced in the following order: MWCNT > MWCNT/Ni > Ni. The power production increased by 7.9 times to 1.2 W/m(3) with 1.5 mg/cm(2) of MWCNT. The power density further increased to 1.9 W/m(3), and the COD maximally decreased by 163.3 mg/L in a 24-h duration with 3.0 mg/cm(2) of MWCNT. The internal resistance decreased maximally by 65.2% to 0.4 k? with 1.5 mg/cm(2) of MWCNT/Ni, and further to 0.3 k? with 3.0 mg/cm(2) of MWCNT/Ni. Electrochemical impedance spectroscopy (EIS) was conducted to assess the effects of different nanomaterials on the impedance of the MFC. Charge transfer resistance of the cathode was maximally reduced by similar to 85% to 0.3 ? with 3.0 mg/cm(2) of MWCNT/Ni. Considering price, stability, and performance, MWCNT is the most practical material for cathode modification. This study is meaningful for sustainable wastewater treatment by enhancing energy production from wastewater treatment process through applying low-cost nanomaterials on the cathode of the MFC.