胡敏酸对纳米二氧化钛光催化降解土霉素的影响  

Effect of Humic Acid on the photocatalytic degradation of oxytetracycline using Nano-Titanium Dioxide

作　　者：黄福杨 梁馨予 王彬[1] 杨柳[1] 龙泉[2] HUANG Fuyang;LIANG Xinyu;WANG Bin;YANG Liu;LONG Quan(International Technology Cooperation Base of Sichuan Low-cost Wastewater Treatment Technology,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China;Sichuan Academy of Environmental Sciences,Chengdu 610041,China)

机构地区：[1]西南科技大学低成本废水处理技术四川省国际科技合作基地,四川绵阳621010 [2]四川省环境保护科学研究院,成都610041

出　　处：《安全与环境学报》2024年第12期4835-4845,共11页Journal of Safety and Environment

基　　金：四川省科技计划项目(2023YFQ0080);四川省科技厅青年基金项目(2023NSFSC0800);西南科技大学博士基金项目(21zx7156)。

摘　　要：胡敏酸普遍存在于土壤中,可与环境中的纳米二氧化钛结合,从而改变纳米二氧化钛的性质及其与共存污染物的相互作用机制。研究以土霉素作为代表性环境污染物,通过模拟太阳日照探究胡敏酸对纳米二氧化钛光催化降解土霉素的影响。结果显示:土霉素在溶液中易光解,碱性条件更易于光解,猝灭试验表明羟基自由基与超氧自由基参与了光解;土霉素的降解率与纳米二氧化钛投加量、溶液初始pH值正相关,与溶液土霉素初始质量浓度负相关;胡敏酸对纳米二氧化钛光催化降解土霉素兼具促进与抑制作用,胡敏酸初始质量浓度为100 mg/L、250 mg/L时,可促进土霉素的光催化降解,而胡敏酸初始质量浓度为500 mg/L、1000 mg/L时,形成的复合物会抑制土霉素的光催化降解。Humic Acid is commonly found in soil and can bind to Nano-Titanium Dioxide in the environment,altering its properties and interaction mechanisms with coexisting pollutants.In this study,oxytetracycline was selected as a representative environmental contaminant.We investigated the effect of Humic Acid on the photocatalytic degradation of oxytetracycline using Nano-Titanium Dioxide under simulated solar irradiation.The results indicated that oxytetracycline readily undergoes photolysis in solution,with alkaline conditions enhancing this process.Quenching experiments revealed the involvement of hydroxyl radicals and superoxide radicals in the photolysis mechanism.Additionally,oxytetracycline demonstrated relative stability under dark reaction conditions.The degradation rate of oxytetracycline was positively correlated with both the dosage of Nano-Titanium Dioxide and the initial pH of the solution,while it was negatively correlated with the initial concentration of the solution.Additionally,the presence of Humic Acid and the formation of oxytetracycline complexes can enhance the degradation rate of oxytetracycline.As the dosage of Nano-Titanium Dioxide increased from 10 mg/L to 100 mg/L,the degradation rate of oxytetracycline rose from 39.4%to 69.9%.Conversely,when the initial concentration of oxytetracycline was elevated from 10 mg/L to 100 mg/L,the degradation rate decreased from 60.2%to 18.6%.As the pH value of the solution increased from 3 to 9,the degradation rate of oxytetracycline improved significantly,rising from 25.0%to 75.6%.Compared with the pure solution system,the degradation rate of the composite system of humic acid and oxytetracycline increased by up to 15.1 percentage points.Humic Acid exerts both promoting and inhibiting effects on the photocatalytic degradation of oxytetracycline by Nano-Titanium Dioxide.When the initial concentration of humic acid was 100 mg/L and 250 mg/L,the photocatalytic degradation of oxytetracycline was promoted,and the degradation rate was increased by 2.6 percentage poin

关 键 词：环境工程学 胡敏酸 纳米二氧化钛 土霉素 光催化降解 

分 类 号：X5[环境科学与工程—环境工程]