Yadav Sushma, Shah Anjali, Malhotra Priti
Department of Chemistry, Daulat Ram College, University of Delhi, Delhi, 110007 India.
Environ Dev Sustain. 2023 Jan 24:1-28. doi: 10.1007/s10668-022-02895-2.
In recent times, there is a mammoth challenge for the world and mankind to deal with the frequent use and misuse of antibiotics and its casual discard to the water bodies. The scavenging degradation of antibiotics which are no longer in use from the environment is a growing concern and compulsively needs to be addressed. Herein, we have devised a novel and green protocol for the synthesis of CuO decorated on reduced graphene oxide (CuO/RGO) nanocomposite (NCs) using agro-waste, orange pomace extract (OPE) as a reducing and stabilizing agent for the degradation of antibiotic. The biogenically synthesized CuO/RGO NCs proved to emerge as an excellent degradation catalyst exhibiting efficiency of 98.68% within 15 min and 86.38% within 30 min for 10 mg/L DC concentration assisted by ultrasound waves and solar light respectively in separate reactions. The complete degradation process followed a pseudo-first-order kinetics with a rate constant of 0.29 min and 0.0542 min for sonocatalytic and photocatalytic degradation process, respectively. Surface area analysis showed that with the increase in the GO amount, the doxycycline degradation increases. An in-depth mechanistic account of sonocatalytic and photocatalytic process has been discussed followed by a radical scavenging test which validated the major role of the synthesized NCs in the degradation of DC. The extraordinary catalytic indulgence of biogenically synthesized graphene-based nanocatalyst opens newer avenues for future research in green chemistry and catalytic field.
The online version contains supplementary material available at 10.1007/s10668-022-02895-2.
近年来，世界和人类面临着一项巨大挑战，即应对抗生素的频繁使用和滥用以及随意丢弃到水体中的问题。从环境中清除不再使用的抗生素的降解是一个日益受到关注的问题，迫切需要加以解决。在此，我们设计了一种新颖的绿色方案，使用农业废弃物橙皮渣提取物（OPE）作为还原剂和稳定剂，合成负载在还原氧化石墨烯（CuO/RGO）上的纳米复合材料（NCs），用于抗生素降解。生物合成的CuO/RGO NCs被证明是一种优异的降解催化剂，在单独的反应中，分别在超声波和太阳光辅助下，对于10mg/L的强力霉素（DC）浓度，在15分钟内降解效率为98.68%，在30分钟内降解效率为86.38%。完全降解过程遵循准一级动力学，声催化和光催化降解过程的速率常数分别为0.29min⁻¹和0.0542min⁻¹。表面积分析表明，随着氧化石墨烯（GO）量的增加，强力霉素的降解增加。随后讨论了声催化和光催化过程的深入机理，并通过自由基清除试验验证了合成的NCs在DC降解中的主要作用。生物合成的基于石墨烯的纳米催化剂的非凡催化活性为绿色化学和催化领域的未来研究开辟了新途径。
在线版本包含可在10.1007/s10668 - 022 - 02895 - 2获取的补充材料。
