Adsorption and catalytic hydrolysis of carbaryl and atrazine on pig manure-derived biochars: impact of structural properties of biochars.
Adsorption and catalytic hydrolysis of carbaryl and atrazine on pig manure-derived biochars: impact of structural properties of biochars.
复制标题
DOI：
10.1016/j.jhazmat.2012.11.046
复制
发表时间：
2013-01
影响因子：
13.6
通讯作者：
Peng Zhang;Hongwen Sun;L. Yu;T. Sun
中科院分区：
文献类型：
--
作者：
Peng Zhang;Hongwen Sun;L. Yu;T. Sun
以猪粪为原料制备生物炭，以阐明高灰分生物炭对农药去向的影响。研究了西维因和阿特拉津在原始生物炭和脱灰生物炭上的吸附和催化降解。西维因有机碳的归一化吸附系数为102.65~103.66L/kg，阿特拉津的有机碳归一化吸附系数为101.90~103.57L/kg(Ce0.5 mg/L)，仅靠疏水作用不能解释吸附的原因，农药的吸附还涉及到孔填充和π-π电子供体-受体相互作用等多种过程。脱除后的生物炭的吸附大大增加，表明原生物炭中的一些有机吸附部位由于与无机部分的相互作用而被堵塞或难以进入。在生物炭存在下，农药的降解速度较快，在700℃热解的生物炭存在下，西维因和阿特拉津在12h内的降解率分别为71.8%和27.9%。溶液pH升高是水解率提高的主要原因，但矿物质表面和生物炭释放出的溶解金属离子都对水解度有催化作用。
Biochars were produced from pig manure to elucidate the influence of biochars with high ash contents on the fate of pesticides. Adsorption and catalytic hydrolysis of carbaryl and atrazine on original biochars and deashed biochars were investigated. The two pesticides were substantially adsorbed by the biochars, with organic carbon normalized sorption coefficient (Koc) values of 102.65–103.66L/kg for carbaryl and 101.90–103.57L/kg for atrazine at Ceof 0.5mg/L. Hydrophobic effect alone could not explain the sorption, and several other processes including pore-filling and π–π electron donor–acceptor interactions were involved in pesticide adsorption. Adsorption increased greatly on the deashed biochar, indicating that some organic sorption sites in the original biochars were blocked or difficult to access due to their interactions with inorganic moiety. The pesticides were found to hydrolyze faster in the presence of biochars, and in the presence of biochar pyrolyzed at 700°C, carbaryl and atrazine were decomposed by 71.8% and 27.9% in 12h, respectively. The elevated solution pH was the main reason for the enhanced hydrolysis; however both the mineral surface and dissolved metal ions released from the biochars were confirmed to catalyze the hydrolysis.