Performance of iron – doped activated carbon synthesised from cocoa husk as a cathode catalyst in microbial fuel cell powered Fenton process

IF 2.8 4区 生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Juliana John, Karnapa Ajit, Haribabu Krishnan, Ahammed Sherief Kizhakkethil Youseph
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引用次数: 0

Abstract

BACKGROUND

Bio-electro-Fenton (BEF) systems, specifically microbial fuel cell (MFC) driven electro-Fenton (EF) systems, have gained significant attention in wastewater treatment in recent years. The role of the cathode catalyst in BEF is crucial, as it undergoes O2 reduction via a 2e oxygen reduction reaction (ORR) to produce H2O2. In this study, we have harnessed the abundant lignocellulosic composition of cocoa pod husk (CPH) to prepare a novel iron-doped heterogeneous Fenton catalyst for the BEF system. Cocoa is typically grown for its wet beans, which constitute only one third of cocoa fruit by weight, while CPH makes up about two-thirds of the weight and is often discarded as by-product or waste. As a result, approximately 10 million tons of CPH are produced globally each year, highlighting the potential for transforming it into a value-added product. To date, CPH has been utilised as a natural fertiliser, soil amendment, biomass fuel, poultry and livestock feed ingredient, and more.

RESULTS

The presence of mesoporous structure, iron content, oxygen containing functional groups, and prominent reduction peaks in cyclic voltammetry validated the Fe-doped cocoa husk biochar's (Fe-CHB) potential to act as an ORR catalyst. The BEF system achieved an open circuit voltage, current, and power densities of 0.697 V, 0.15 A/m2, and 0.040 W/m2, respectively, at an optimum resistance of 350 Ω. Optimisation of the process parameters using RSM and ANN predicted maximum dye removal efficiencies of 93.34% and 92.45%, respectively, at dye and substrate concentrations of 10 mg/L and 1 g/L. These predictions closely aligned with the experimental findings of 92.5%.

CONCLUSION

The synthesised catalyst provided large surface area, electrical conductivity, superior ORR catalytic efficiencies, and ample sites for H2O2 activation. Hence, Fe-CHB can serve as a highly effective electrocatalyst in BEF systems. © 2024 Society of Chemical Industry (SCI).

用可可壳合成的掺铁活性炭作为以芬顿工艺为动力的微生物燃料电池阴极催化剂的性能
背景 生物-电-芬顿(BEF)系统,特别是微生物燃料电池(MFC)驱动的电-芬顿(EF)系统,近年来在废水处理领域备受关注。阴极催化剂在 BEF 中的作用至关重要,因为它通过 2e- 氧还原反应(ORR)还原 O2,产生 H2O2。在本研究中,我们利用可可荚壳(CPH)中丰富的木质纤维素成分,为 BEF 系统制备了一种新型掺铁异质芬顿催化剂。种植可可通常是为了生产湿可可豆,按重量计算,湿可可豆只占可可果实的三分之一,而可可荚壳约占三分之二,通常作为副产品或废物丢弃。因此,全球每年生产约 1 000 万吨 CPH,这凸显了将其转化为增值产品的潜力。迄今为止,CPH 已被用作天然肥料、土壤改良剂、生物质燃料、家禽和牲畜饲料成分等。 结果 在循环伏安法中,介孔结构、铁含量、含氧官能团和显著的还原峰的存在验证了掺铁可可壳生物炭(Fe-CHB)作为 ORR 催化剂的潜力。当最佳电阻为 350 Ω 时,BEF 系统的开路电压、电流和功率密度分别为 0.697 V、0.15 A/m2 和 0.040 W/m2。使用 RSM 和 ANN 对工艺参数进行优化后,在染料和底物浓度分别为 10 mg/L 和 1 g/L 时,最大染料去除率分别为 93.34% 和 92.45%。这些预测结果与 92.5% 的实验结果非常吻合。 结论 合成的催化剂具有大表面积、导电性、优异的 ORR 催化效率和充足的 H2O2 活化位点。因此,Fe-CHB 可在 BEF 系统中用作高效的电催化剂。© 2024 化学工业学会(SCI)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.00
自引率
5.90%
发文量
268
审稿时长
1.7 months
期刊介绍: Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.
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