摘要
该文研究了生物炭对戊唑醇的吸附性能、机理及其生物炭粒径、用量、pH和共存干扰物等对生物炭吸附的影响,为控制唑类农药对环境的污染提供理论依据和技术支撑。结果表明虽然生物炭对戊唑醇的理论最大吸附容量10.8 mg/g,小于多壁碳纳米管(MWCNTs)理论最大吸附容量53.6 mg/g,但是性价比远高于MWCNTs;吸附发生源于戊唑醇中的羟基氢吸引生物炭芳环的π键电子云和C-O中氧的孤对电子,其中芳环骨架上的吸附能大于C-O处的吸附能。生物炭对戊唑醇的吸附容量随粒径增加开始增加显著后不明显;吸附剂用量增加对生物炭的吸附容量影响很小,但戊唑醇去除率增加;弱碱条件(pH=8.5)生物炭对戊唑醇的吸附容量最大;共存环丙唑醇引起戊唑醇的吸附量降低,浓度越大吸附竞争能力越强,戊唑醇吸附竞争能力强于环丙唑醇。
The adsorption performance and mechanism of tebuconazole(TBZ)on biochar(BC)and the effects of BC particle size and dosage,pH and coexisting interferences on adsorption of TBZ were studied in order to provide theoretical basis and technical support for controlling environmental pollution from azole pesticides.The results showed that although the theoretical maximum adsorption capacity of TBZ on BC was 10.8 mg/g,less than that on MWCNTs 53.6 mg/g,the performance-price ratio of BC was much higher than that of MWCNTs.The adsorption was the result of hydrogen in hydroxyl of TBZ attracting aromatic ringsπelectron cloud and oxygen lone pair electrons in C-O of BC.In which,the adsorption energy at aromatic ring skeleton was larger than that at C-O.With the increase of particle size,the adsorption capacity of TBZ on BC increased significantly at first,but then not obviously.The increase of adsorbent dosage had little effects on the adsorption capacity of BC,but increased TBZ removal efficiency.Under weak alkali condition(pH=8.5),the adsorption capacity of TBZ on BC was the largest.The coexisting adsorbate cyproconazole(CPZ)made adsorption of TBZ by BC decrease.The higher the adsorbate concentration,the stronger the adsorption competitiveness.The competitive adsorption of TBZ was stronger than that of CPZ.
作者
薛金凤
庹伟玲
计从波
冯志辉
XUE Jinfeng;TUO Weiling;JI Congbo;FENG Zhihui(School of Power and Mechanical Engineering,Wuhan University,Wuhan 430072,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2019年第10期108-112,共5页
Environmental Science & Technology
基金
国家重点研发计划（2018YFC1801704）
国家科技支撑计划（2012BAJ21B06）
