UV-induced simultaneous oxidation/reduction of cefixime and chromium  

作　　者：Shohreh Azizi 

机构地区：[1]UNESCO-UNISA Africa Chair in Nanosciences and Nanotechnology,College of Graduate Studies,University of South Africa,Muckleneuk Ridge,PO Box 392,Pretoria,0002,South Africa

出　　处：《Emerging Contaminants》2024年第2期98-105,共8页新兴污染物（英文）

基　　金：The author is grateful to SASOL-NRF University Collaborative Research Grants(Grant No.138626).

摘　　要：This study explores a novel approach utilizing a UV-based photo-removal process to simultaneously eliminate organic(Cefixime-CFX)and inorganic(chromium)pollutants from wastewater.The photoreactor's configuration,segregating wastewater inlets and outlets,facilitates efficient removal.The study investigates the effect of various parameters such as pH,CFX:Cr molar ratio,and kinetic models on the removal efficiency.Analytical methods involve high-performance liquid chromatography for CFX concentration determination and atomic absorption for chromium measurement.Results showed that higher pH levels favored enhanced photo-removal of both compounds,with pH 9 displaying optimal removal efficiencies of 100%for CFX and 46.7%for chromium.The CFX/Cr molar ratio of 20:1 exhibited superior removal rates,achieving approximately 100%CFX and 82.3%chromium removal within 25 min.Additionally,kinetic analyses indicated the importance of pH in accelerating organic breakdown and subsequent production of reducing and oxidizing species,facilitating chromium precipitation.Effluent toxicology tests using the Kirby&Bauer method indicate a significant reduction in toxicity over time,suggesting the suitability of the effluent for discharge into the environment.Additionally,sludge analysis through FTIR identifies various chromate species produced during the photo-removal process,contributing to a comprehensive understanding of sludge composition.The investigation demonstrates that the UV-based photo-removal process efficiently removes both organic and inorganic pollutants while minimizing energy consumption and avoiding the formation of hazardous secondary intermediates.This study provides insights into a sustainable and effective method for wastewater treatment,with potential applications in environmental protection and pollution control.

关 键 词：Simultaneous removal Organic radical SLUDGE Degradation PRECIPITATION 

分 类 号：X70[环境科学与工程—环境工程]