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负载氧化石墨烯-氧化钨纳米复合材料的粉煤灰用于快速去除铅离子及废吸附剂光催化降解对乙酰氨基酚的再利用

Coal Fly Ash Decorated with Graphene Oxide-Tungsten Oxide Nanocomposite for Rapid Removal of Pb Ions and Reuse of Spent Adsorbent for Photocatalytic Degradation of Acetaminophen.

作者信息

Umejuru Emmanuel Christopher, Prabakaran Eswaran, Pillay Kriveshini

机构信息

Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg 2028, South Africa.

出版信息

ACS Omega. 2021 Apr 22;6(17):11155-11172. doi: 10.1021/acsomega.0c04194. eCollection 2021 May 4.

DOI:10.1021/acsomega.0c04194
PMID:34056271
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8153921/
Abstract

Coal fly ash was decorated with a graphene oxide-tungsten oxide nanorods nanocomposite (CFA/GO/WONRs nanocomposite) via a hydrothermal method and applied for the remediation of lead (Pb ions). The Pb ion-loaded spent adsorbent (CFA/GO/WONRs + Pb nanocomposite) was reused for the photodegradation of acetaminophen. CFA/GO/WONRs + Pb nanocomposite displayed rapid removal of Pb ions. Pseudo-second-order kinetics and the Langmuir isotherm model described the adsorption data. The adsorption capacity of the CFA/GO/WONRs nanocomposite was 41.51 mg/g for the removal of Pb ions. Additionally, the Pb ion-loaded spent adsorbent significantly influenced the degradation of acetaminophen by photocatalysis where 93% degradation was observed. It is worthy to note the reuse application of Pb ion-loaded spent adsorbent as a photocatalyst, which will significantly reduce the secondary waste obtained from conventional adsorption methods.

摘要

通过水热法用氧化石墨烯-氧化钨纳米棒纳米复合材料（CFA/GO/WONRs纳米复合材料）对煤飞灰进行修饰，并将其用于铅（Pb离子）的修复。负载Pb离子的废吸附剂（CFA/GO/WONRs + Pb纳米复合材料）被重新用于对乙酰氨基酚的光降解。CFA/GO/WONRs + Pb纳米复合材料显示出对Pb离子的快速去除。准二级动力学和朗缪尔等温线模型描述了吸附数据。CFA/GO/WONRs纳米复合材料对Pb离子的吸附容量为41.51 mg/g。此外，负载Pb离子的废吸附剂通过光催化对乙酰氨基酚的降解有显著影响，观察到降解率为93%。值得注意的是负载Pb离子的废吸附剂作为光催化剂的再利用应用，这将显著减少传统吸附方法产生的二次废物。

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