摘要
罗丹明B作为工业上常用的有机染料,具有稳定性高、上色强、着色牢等特点,但其存在毒性和致癌性,且含其废水的可生化性差、降解难,故建立高效、清洁的染料废水处理技术已成为广泛研究的热点。以印染厂的含罗丹明B的染料废水为原料,通过一步水热法制备了具有光催化活性的碳点材料。通过优化制备工艺和降解条件,碳点在pH 1、光照(氙灯或日光)条件下可有效处理化学需氧量(COD)为5 050 mg/L的染料废水,满足纳管排污标准。结合自由基清除实验和电子自旋共振波谱(ESR)分析可推断,光激发过程中产生了多种活性氧物种,在其共同下作用实现了对污染物高效、绿色的降解。利用阳离子交换树脂可实现碳点的回收,且回收后的碳点光催化性能稳定,具有较好的实际应用性。
The organic dye Rhodamine B(RhB),commonly used in the industry,exhibits notable characteristics such as high stability,intense coloring,and rapid coloration.However,it possesses potential toxicity and carcinogenicity,while its wastewater demonstrates poor biodegradability and resistance to degradation.Therefore,the development of an efficient and eco-friendly treatment technology for dye wastewater has become a key focus of extensive research.Fluorescent carbon dots with photocatalytic activity were synthesized via a one-step hydrothermal method using dye wastewater containing Rhodamine B generated in industrial facilities.Through optimization of the preparation process and degradation conditions,the wastewater sample with a COD value of 5050 mg/L can be effectively degraded by carbon dots under pH 1 and irradiation(using a xenon lamp or daylight),thereby meeting sewage discharge standards.The carbon dots can be efficiently recovered by cation exchange resin while maintaining their stable photocatalytic performance.Free radical scavenging experiments and electron spin resonance spectroscopy(ESR)analysis revealed the generation of various active oxygen species during the photoexcitation process,leading to the efficient degradation of pollutants.The practical applicability of this method is demonstrated to be excellent.
作者
吴涛
卓欢
赵孟宇
宋启军
王婵
WU Tao;ZHUO Huan;ZHAO Meng-yu;SONG Qi-jun;WANG Chan(School of Chemical&Material Engineering,Jiangnan University,Wuxi 214122,China)
出处
《化学试剂》
CAS
2024年第4期21-27,共7页
Chemical Reagents
基金
国家自然科学基金面上项目(NO.22376081,NO.51973083)。
关键词
罗丹明B
染料废水
荧光碳点
光催化降解
树脂回收
Rhodamine B
dye wastewater
fluorescent carbon dots
photocatalytic degradation
recycle
