Effect of Cu2+coexistence on adsorption of sulfadiazine in soil
XU Zi-wen1, DONG Meng-yang1, LIU Xi-juan1, SHAO Yi-fei1, LV Shi-quan1, HU Shu-xiang1, XU Yu-zhi2, HU Xin-xin2, LIU Ai-ju2
1. School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China; 2. School of Resources and Environment Engineering, Shandong University of Technology, Zibo 255091, China
Abstract：Copper (Cu) and Sulfadiazine (SDZ) were selected as target pollutants as their high detection rate in soil environment. The batch sorption methods were used to investigate effects of pH, ion concentration, organic matter content and particle size on SDZ adsorption to soil with Cu2+ co-existing. The adsorption mechanism of SDZ in soil was characterized by FT-IR analysis. Co-existence of Cu2+ significantly increased the adsorption amount of SDZ on soil even with different pH conditions. Both Cu2+ and Ca2+ could promote SDZ adsorption to soil particles by complexation and ion-bridge. The effect of organic matter on adsorption of SDZ on soil was greatly related to concentrations of the co-existing Cu2+. The adsorption of SDZ to soil clay was little influenced by the co-existing Cu2+. FT-IR analysis showed that the physical adsorption was the main mechanism of SDZ adsorption to soil, which was also accompanied by hydrogen bonding interactions, complexation and π-π conjugation. Cu2+ can significantly increase the retention capacity of SDZ in soil and reduce its risk of environmental migration.
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