Department of Environmental Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China.
Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, 310058, Zhejiang, China.
Environ Sci Pollut Res Int. 2019 May;26(14):14382-14392. doi: 10.1007/s11356-019-04760-8. Epub 2019 Mar 13.
Biochar are widely used as adsorbents/amendments for immobilizing pollutants in contaminated soils. In this study, the effects of dissolved organic matter derived from chicken manure (CMDOM) on the adsorption of ciprofloxacin (CIP) and Cu onto biochars were investigated. The FTIR spectra indicated that π-π donor-acceptor interactions between the hydroxyl groups on the biochar surface and the fluorine group connected to the benzene ring of CIP molecule was the main adsorption mechanism for CIP. CMDOM molecules interacted with the aromatic components in biochars and thus modified the surface chemical properties of biochar. The effect of CMDOM on the adsorption of CIP onto biochars showed great dependence on the distribution of solid adsorbed CMDOM and CMDOM in aqueous solutions. The solid adsorbed CMDOM facilitated CIP adsorption owing to increase the content of -OH on biochar surface, which could provide more π-electron donors and thus strengthened π-π EDA interactions between CIP and biochars. The EDS spectra showed that the ion exchange with K was the main adsorption mechanism for Cu onto biochars, and the presence of CMDOM enhanced complexation of Cu with adsorbed CMDOM, thus increasing Cu adsorption onto biochars. These results are useful for the application of biochars to immobilize antibiotic and heavy metals in contaminated farmland soils when animal manure fertilizers is presented in soil environment.
生物炭被广泛用作吸附剂/改良剂，用于固定污染土壤中的污染物。在这项研究中，研究了鸡粪来源的溶解有机质（CMDOM）对环丙沙星（CIP）和 Cu 在生物炭上吸附的影响。FTIR 谱表明，生物炭表面羟基与 CIP 分子苯环上的氟基团之间的π-π供体-受体相互作用是 CIP 吸附的主要吸附机制。CMDOM 分子与生物炭中的芳构化成分相互作用，从而改变了生物炭的表面化学性质。CMDOM 对 CIP 在生物炭上吸附的影响极大地依赖于固相中吸附的 CMDOM 和水溶液中 CMDOM 的分布。固相中吸附的 CMDOM 促进了 CIP 的吸附，因为它增加了生物炭表面-OH 的含量，从而提供了更多的π电子供体，从而增强了 CIP 与生物炭之间的π-π EDA 相互作用。EDS 谱表明，K 的离子交换是 Cu 吸附到生物炭上的主要吸附机制，而 CMDOM 的存在增强了 Cu 与吸附的 CMDOM 的络合，从而增加了 Cu 在生物炭上的吸附。这些结果对于在土壤环境中当动物粪便肥料存在时，将生物炭应用于固定污染农田土壤中的抗生素和重金属是有用的。
