Cu-Mn-MRBC去除水中ENR、STZ及TCH抗生素的性能与机理

为研究多种抗生素污染物共存于水体的作用机理,本文以废菌渣（MR）为原料,经炭化制备MR生物炭（MRBC）,通过铜锰复合改性合成Cu-Mn-MRBC,对材料进行了SEM、BET、XRD、FTIR、Zeta电位和EA表征分析,研究了其对水中3种抗生素ENR、STZ与TCH分别在单一与混合溶液中的吸附性能.结果表明,相比于单一溶液,混合溶液中竞争吸附的出现增加了对含氧官能团的选择性消耗;对TCH的吸附有促进作用,在混合溶液中去除率为96.50%,对STZ的抑制作用大于ENR,在混合溶液中去除率分别为39.38%和46.13%;吸附过程对pH值的依赖性减小;共存阳离子的存在会影响抗生素的竞争吸附能力.准二级动力学和Freundlich等温模型可更好地描述Cu-Mn-MRBC的吸附过程.吸附主要为静电作用、相互作用、氢键作用和表面络合等共同作用的结果.

Performance and mechanism of Cu-Mn-MRBC in the removal of ENR,STZ and TCH antibiotics from water

This study aimed to investigate the mechanism of action of multiple antibiotic pollutants coexisting in water bodies. In this work, MR biochar (MRBC) was obtained through carbonization using waste bacterial residue (MR) as raw material, and Cu-Mn-MRBC was synthesized through the composite modification of both copper and manganese. The materials were characterized and analyzed by SEM, BET, XRD, FTIR, zeta potential, and EA. Furthermore, the adsorption performance of three antibiotics of ENR, STZ and TCH in single and mixed solutions was studied as well. The results show that comparing with single solution, the emergence of competitive adsorption in mixed solutions increases the selective depletion of oxygen-containing functional groups. Moreover, it promotes the adsorption of TCH with the removal rate of 96.50% in the mixed solution, but inhibits STZ more than ENR, with the removal rates in the mixed solution of 39.38% and 46.13%, respectively. Absorption process in the system decreased the pH dependence. The presence of coexisting cations affects the competitive adsorption capacity of antibiotics. Pseudo-second-order kinetic and Freundlich isotherm models can better describe the adsorption process of Cu-Mn-MRBC. The adsorption is mainly the results of electrostatic interaction, π-π interaction, hydrogen bonding, and surface complexation.