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Functional CdS nanocomposites recovered from biomineralization treatment of sulfate wastewater and its applications in the perspective of photocatalysis and electrochemistry.
Science of the Total Environment ( IF 9.8 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.scitotenv.2020.140646
Wanqing Ren , Chunli Wan , Zhengwen Li , Xiang Liu , Ren Zhang , Xiaoying Yang , Duu-Jong Lee

The sulfur ions generated during the microbial treatment of sulfate wastewater could cause secondary pollution problem, however, the application of the biomineralization technique could convert sulfur ions into sulfide nanocomposites with diverse properties. This study constructed a multi-stage process for sulfate wastewater treatment and CdS nanocomposites (CdS-NCs) recovery by using biomineralization, which simultaneously achieved the removal of pollutants and recovery of functional nanocomposites. In this process, about 97% of the sulfate could be removed, and the CdS-NCs with a diameter of 16.0–20.2 nm were collected at different pHs. The results of FTIR and Raman proved that the biomacromolecules derived from microorganisms participated in the formation of CdS-NCs. The Mott-Schottky curve suggested that the CdS-NCs belonged to n-type semiconductors with the energy gap of 2.29–2.38 eV and could be applied as the photocatalyst, and up to 78.2% of 200 mg/L tetracycline was photodegraded catalytically by CdS-NCs obtained at pH 6.5. In the application of CdS-NCs as anodes of lithium-ion batteries, all the batteries assembled by CdS-NCs exhibited a very strong cycle performance of more than 500 cycles. This research not only effectively recovered nanocomposites with great application potential from sulfate wastewater but also provided a perspective for the utilization of recovered resources.



中文翻译:

从硫酸盐废水生物矿化处理中回收的功能性CdS纳米复合材料及其在光催化和电化学方面的应用。

硫酸盐废水微生物处理过程中产生的硫离子可能引起二次污染问题,但是,生物矿化技术的应用可以将硫离子转化为具有多种性质的硫化物纳米复合材料。这项研究通过生物矿化技术构建了硫酸盐废水处理和CdS纳米复合物(CdS-NCs)回收的多阶段过程,同时实现了污染物的去除和功能性纳米复合物的回收。在此过程中,可以去除约97%的硫酸盐,并在不同的pH值下收集了直径为16.0-20.2 nm的CdS-NC。FTIR和Raman的结果证明,源自微生物的生物大分子参与了CdS-NCs的形成。Mott-Schottky曲线表明,CdS-NCs属于能带隙为2.29–2.38 eV的n型半导体,可以用作光催化剂,CdS可以将光催化降解200 mg / L的四环素中的高达78.2%。 -NC在pH 6.5下获得。在将CdS-NC用作锂离子电池的负极时,所有由CdS-NC组装的电池均表现出非常强的循环性能,超过500次循环。这项研究不仅有效地从硫酸盐废水中回收了具有巨大应用潜力的纳米复合材料,而且为回收资源的利用提供了前景。在将CdS-NC用作锂离子电池的负极时,所有由CdS-NC组装的电池均表现出非常强的循环性能,超过500次循环。这项研究不仅有效地从硫酸盐废水中回收了具有巨大应用潜力的纳米复合材料,而且为回收资源的利用提供了前景。在将CdS-NC用作锂离子电池的负极时,所有由CdS-NC组装的电池均表现出非常强的循环性能,超过500次循环。这项研究不仅有效地从硫酸盐废水中回收了具有巨大应用潜力的纳米复合材料,而且为回收资源的利用提供了前景。

更新日期:2020-07-05
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