Sustainable fermentable sugar production using a glass fiber supported gallium–molybdenum photocatalyst towards bioethanol production: LCA analysis†

IF 3.2 Q2 CHEMISTRY, PHYSICAL
Energy advances Pub Date : 2024-08-16 DOI:10.1039/D4YA00226A
Rajat Chakraborty, Sourav Barman and Aritro Sarkar
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Abstract

For the first time, a cost-effective glass fiber (GF) support derived from waste printed circuit boards (W-PCBs) was utilized to synthesize a reusable GF-supported gallium–molybdenum photocatalyst (GaMo–GF) for generating fermentable sugar (FS) from delignified corncob (DCC) in a quartz halogen solar batch reactor (QHSR). Additionally, this paper presents a comparative detoxification investigation and subsequent fermentation of the resulting FS using Pichia stipitis. The optimum Ga4Mo-GF (with a gallium precursor loading of 4 wt%) photocatalyst exhibited impressive characteristics, including a high specific surface area (28.01 m2 g−1), high pore volume (0.04198 cc g−1) and lower band gap energy (2.3 eV), providing a maximum 78.35 mol% FS yield under mild reaction conditions (100 °C and 20 min) with mild energy consumption (12 kJ mL−1). The comparative hydrolysate detoxification study highlighted the superior efficacy of the Amberlite IRP69 cation resin, achieving maximum removal rates of 86% for furfural, 92% for formic acid, and 95% for levulinic acid compared to other methods. Furthermore, the hydrolysate detoxified using Amberlite IRP69 resulted in a higher bioethanol concentration (4.32 mmol mL−1) compared to NaOH neutralization (3.06 mmol mL−1), Ca(OH)2 over-liming (2.88 mmol mL−1), and ethyl acetate solvent extraction (3.73 mmol mL−1) when fermented with Pichia stipitis. Additionally, the overall environmental impact assessment indicated that utilizing the Amberlite IRP69 cation resin not only enhanced bioethanol yield but also reduced environmental impacts. Remarkably, the optimized Ga4Mo-GF catalyst demonstrated reusability for up to 7 cycles in the DCC hydrolysis process, showcasing its stability and the consequential reduction in environmental impacts throughout the corncob to bioethanol conversion process.

Abstract Image

Abstract Image

利用玻璃纤维支撑的镓钼光催化剂生产生物乙醇,实现可持续发酵糖生产:生命周期评估分析
本文首次利用从废弃印刷电路板(W-PCBs)中提取的具有成本效益的玻璃纤维(GF)载体,合成了一种可重复使用的玻璃纤维载体镓钼光催化剂(GaMo-GF),用于在石英卤素太阳能批式反应器(QHSR)中从脱木质素玉米芯(DCC)中生成可发酵糖(FS)。此外,本文还介绍了一项比较解毒研究,以及随后使用 Pichia stipitis 对所产生的可发酵糖进行发酵。最佳 Ga4Mo-GF(镓前体负载量为 4 wt%)光催化剂表现出令人印象深刻的特性,包括高比表面积(28.01 m2 g-1)、高孔隙率(0.04198 cc g-1)和较低的带隙能(2.3 eV),在温和的反应条件下(100 °C、20 分钟),能耗较低(12 kJ mL-1),可提供最高 78.35 mol% 的 FS 产量。水解物解毒对比研究凸显了 Amberlite IRP69 阳离子树脂的卓越功效,与其他方法相比,糠醛的最大去除率为 86%,甲酸的最大去除率为 92%,乙酰丙酸的最大去除率为 95%。此外,在使用 Pichia stipitis 发酵时,与 NaOH 中和法(3.06 mmol mL-1)、Ca(OH)2 超限法(2.88 mmol mL-1)和乙酸乙酯溶剂萃取法(3.73 mmol mL-1)相比,使用 Amberlite IRP69 进行解毒的水解物产生了更高的生物乙醇浓度(4.32 mmol mL-1)。此外,整体环境影响评估表明,使用 Amberlite IRP69 阳离子树脂不仅能提高生物乙醇产量,还能减少对环境的影响。值得注意的是,经过优化的 Ga4Mo-GF 催化剂在 DCC 水解过程中可重复使用长达 7 个周期,这证明了其稳定性以及在玉米芯到生物乙醇的整个转化过程中对环境影响的相应减少。
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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CiteScore
1.80
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