摘要
实际天然水体中能广泛检测到新污染物,由于其生态毒性大且难以被传统水处理技术去除,因而受到广泛关注。然而对实际水体中污染物在共存状态下的相互作用机制及其去除方法的相关研究,却报道较少。文章研究了水体中检出率较高的双酚A(Bisphenol A,BPA)以及共存的四环素(Tetracycline,TC)、苯海拉明(Diphenhydramine,DP)和苯妥英(Phenytoin,PHT)等新污染物之间的相互作用及其在铁碳催化剂表面的转化动力学,通过采用系列表征手段探究污染物间的相互作用及电子转移,证实了BPA与TC、DP和PHT分别形成了BPA-TC/DP/PHT复合络合物。该复合络合物与铁碳催化剂表面吸附配位会引起更大的表面电荷离域,引发在水中溶解氧表面电子俘获传导,从而触发吸附络合物表面裂解,使BPA降解率分别降至62.1%、53.6%和70.0%,而BPA复合的TC、DP和PHT降解率分别提高17.2%、31.6%和44.8%,相应反应速率常数分别增加2.195倍、1.810倍及3.459倍。结果表明,催化体系产物均为低毒性或无害物质,具有一定的环境效益。
Emerging contaminants are widely detected in actual natural water bodies and have been the subject of considerable research interest due to their high ecotoxicity and the difficulty of their removal by conventional water treatment technologies.However,there is a paucity of literature on the mechanisms of pollutant interactions and their removal in actual water bodies under coexistence states.In this paper,we investigated the interactions between bisphenol A(BPA),which has a high detection rate in natural water bodies,and its coexisting pollutants,such as tetracycline(TC),diphenhydramine(DP),and phenytoin(PHT),as well as their transformation kinetics on the surface of the iron-carbon catalyst.A series of characterization tools were used to probe the pollutants interactions and electron transfer,confirming the formation of BPA-TC/DP/PHT composite complexes by BPA with TC,DP and PHT,respectively.The adsorption coordination of the composite complex with the surface of the iron-carbon catalyst resulted in a larger surface charge leaving the domain,which triggered the electron capture conduction on the surface of dissolved oxygen in water and the surface cleavage of the adsorbed complexes.The BPA degradation rate decreased to 62.1%,53.6%and 70.0%,respectively,however,the degradation rates of BPA-complexed TC,DP and PHT increased by 17.2%,31.6%and 44.8%,respectively,and the corresponding reaction rate constants increased by 2.195,1.810 and 3.459 times,respectively.The products are low toxicity or harmless substances,and the catalytic system with environmental benefits.
作者
茅立燊
南浥尘
王裕猛
廖威翔
胡春
MAO Li-shen;NAN Yi-chen;WANG Yu-meng;LIAO Wei-xiang;HU Chun(Key Laboratory for Water Quality and Conservation of the Pearl River Delta,Ministry of Education,Institute of Environmental Research at Greater Bay,Guangzhou University,Guangzhou 510006,China)
出处
《广州大学学报(自然科学版)》
2025年第3期70-78,共9页
Journal of Guangzhou University(Natural Science Edition)
基金
国家自然科学基金资助项目(52350005,51838005)
广东省“珠江人才引进计划”引进创新创业团队资助项目(2019ZT08L387)。
关键词
新污染物
复合污染物
铁碳催化剂
表面裂解
emerging contaminants
composite pollutants
iron-carbon catalyst
surface cleavage
