从电子废弃物中溶解二氧化硅的工艺优化是实现生物修复的可持续步骤

IF 5.4 Q2 ENGINEERING, ENVIRONMENTAL Journal of hazardous materials advances Pub Date : 2024-11-01 DOI:10.1016/j.hazadv.2024.100514
Prabhjot Kaur , Jitender Sharma , Amarjit Singh , Parveen Kumar , Mukesh Kumar , Saurabh Kumar Kardam , Shubhang Bhardwaj , Ashish Kumar , Sunita Dalal
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引用次数: 0

摘要

高纯度硅是电子废物的主要组成部分。目前处理电子垃圾的方法都是能源密集型或基于化学的。由于微生物在平衡硅循环方面发挥着积极作用,因此本研究探索了从电子垃圾中溶解硅的微生物途径。研究重点是分离出的硅酸盐溶解细菌(SSB)Staphylococcus gallinarum CON2,以了解其溶解电子垃圾和二氧化硅芯片中二氧化硅的能力。使用 Plackett Burman 设计对细菌溶解二氧化硅的各种参数进行了优化。采用标准的杂多酸法对溶解的二氧化硅进行定量分析。在预先优化的条件下,对来自太阳能电池板的电子瓦片和实验室涂层二氧化硅芯片进行了细菌处理。为了进行比较,还在类似条件下对另一种 SSB 进行了电子废物修复评估。测定了电子废物处理后硅酸的释放量,并通过傅立叶变换红外分析进一步确认了硅酸的存在。在不同放大倍数的扫描电镜下观察到了二氧化硅颗粒表面的蚀刻和松动。证实了分离出的 S. gallinarum CON2 从电子垃圾中溶解二氧化硅的新潜力。两种硅酸盐溶解细菌对电子垃圾试样表面形貌的作用存在明显差异。
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Process optimization for silica dissolution from e-waste as a sustainable step towards bioremediation
High-purity silicon represents a major component of e-waste. Current methods for e-waste remediation are energy-intensive or chemical-based. Herein, a microbial route for silica dissolution from e-waste was explored, as microbes play an active role in balancing the silicon cycle. The study focused on an isolated silicate solubilizing bacterium (SSB) Staphylococcus gallinarum CON2 for its capability to solubilize silica in e-wafers and silicon dioxide chips. Bacterial silica dissolution was optimized for various parameters using Plackett Burman design. Heteropoly acid method was standardized for quantitative analysis of dissolved silica. Bacterial treatment of e-wafers from solar panels and laboratory-coated silicon dioxide chips were carried out under pre-optimized conditions. For comparison purpose, another SSB was also evaluated for e-waste remediation at similar conditions. The amount of released silicic acid after e-waste treatment was determined, and its presence was further confirmed by FTIR analysis. Etching and loosening of silicon dioxide particles on the surface were observed under SEM at different magnifications. The novel potential of silica dissolution from e-waste by isolated S. gallinarum CON2 was confirmed. A significant difference in the actions of both silicate solubilizing bacteria on the topography of the e-waste specimens was observed.
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来源期刊
Journal of hazardous materials advances
Journal of hazardous materials advances Environmental Engineering
CiteScore
4.80
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0.00%
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审稿时长
50 days
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