当前位置：
X-MOL 学术
›
Sci. Total Environ.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Phototransformation of biochar-derived dissolved organic matter and the effects on photodegradation of imidacloprid in aqueous solution under ultraviolet light.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-12 , DOI: 10.1016/j.scitotenv.2020.137913 Peng Zhang 1 , Yifei Shao 2 , Xuejing Xu 1 , Peng Huang 1 , Hongwen Sun 1
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-12 , DOI: 10.1016/j.scitotenv.2020.137913 Peng Zhang 1 , Yifei Shao 2 , Xuejing Xu 1 , Peng Huang 1 , Hongwen Sun 1
Affiliation
|
Dissolved organic matter (DOM) strongly influences the photodegradation of organic pollutants, varying depending on the structure of DOM. With the wide application of biochar, increasing amounts of DOM is released from biochar to the environment, which has different structural characteristics compared to natural DOM. In this study, DOM was derived from maize straw (MS) and pig manure (PM) and biochars by pyrolyzing MS and PM at 300 °C and 500 °C and the optical characteristics of DOM before and after phototransformation were explored via ultraviolet-visible spectroscopy and excitation-emission matrix fluorescence. Photodegradation of an insecticide, imidacloprid (IMI) in the presence of DOM was examined. The results showed that DOM derived from biochar obtained by pyrolyzing MS and PM mainly contained two identified fluorescent components and high pyrolysis temperature (500 °C) was associated with low molecular weight, small light-screening effects and great aromaticity of the DOM. After exposure to UV light, the aromaticity and molecular weight of the DOM declined due to phototransformation. Significant enhancement was observed in IMI photodegradation in the presence of biochar-derived DOM, and the enhancement was the greatest with DOM derived from pig manure biochar pyrolyzed at 500 °C. In addition to the light shielding effect, the 1O2 generated from DOM played an important role in the phototransformation of IMI and DOM. The loss of the nitro group and oxidation at the imidazolidine ring were the main photodegradation pathways for IMI. This study expands our understanding of the fate of biochar-derived DOM and its effects on the fate of coexisting organic pollutants.
中文翻译：
生物炭衍生的溶解性有机物的光转化及其对吡虫啉水溶液在紫外光下的光降解作用。
溶解有机物（DOM）强烈影响有机污染物的光降解，具体取决于DOM的结构。随着生物炭的广泛应用，越来越多的DOM从生物炭释放到环境中，与天然DOM相比具有不同的结构特征。在这项研究中，DOM是通过在300°C和500°C下热解MS和PM而从玉米秸秆（MS）和猪粪（PM）和生物炭中衍生而来的，并通过紫外可见光探索了DOM在光转化之前和之后的光学特性。光谱学和激发发射矩阵荧光。检查了在DOM存在下杀虫剂吡虫啉（IMI）的光降解。结果表明，通过热解MS和PM获得的生物炭衍生的DOM主要包含两个已鉴定的荧光成分，并且高的热解温度（500°C）与DOM的低分子量，小的遮光作用和很大的芳香性有关。暴露于紫外线后，由于光转化，DOM的芳香性和分子量下降。在存在生物炭的DOM中，IMI光降解过程中观察到显着增强，并且在500°C下热解的猪粪中生物炭衍生的DOM增强最大。除遮光作用外，由DOM产生的1O2在IMI和DOM的光转化中也起着重要作用。咪唑烷环上硝基的丢失和氧化是IMI的主要光降解途径。
更新日期：2020-03-12
中文翻译：
生物炭衍生的溶解性有机物的光转化及其对吡虫啉水溶液在紫外光下的光降解作用。
溶解有机物（DOM）强烈影响有机污染物的光降解，具体取决于DOM的结构。随着生物炭的广泛应用，越来越多的DOM从生物炭释放到环境中，与天然DOM相比具有不同的结构特征。在这项研究中，DOM是通过在300°C和500°C下热解MS和PM而从玉米秸秆（MS）和猪粪（PM）和生物炭中衍生而来的，并通过紫外可见光探索了DOM在光转化之前和之后的光学特性。光谱学和激发发射矩阵荧光。检查了在DOM存在下杀虫剂吡虫啉（IMI）的光降解。结果表明，通过热解MS和PM获得的生物炭衍生的DOM主要包含两个已鉴定的荧光成分，并且高的热解温度（500°C）与DOM的低分子量，小的遮光作用和很大的芳香性有关。暴露于紫外线后，由于光转化，DOM的芳香性和分子量下降。在存在生物炭的DOM中，IMI光降解过程中观察到显着增强，并且在500°C下热解的猪粪中生物炭衍生的DOM增强最大。除遮光作用外，由DOM产生的1O2在IMI和DOM的光转化中也起着重要作用。咪唑烷环上硝基的丢失和氧化是IMI的主要光降解途径。
京公网安备 11010802027423号