Li Jie, Pan Lan-Jia, Yu Guang-Wei, Wang Yin, You Fu-Tian, Xie Sheng-Yu
Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Huan Jing Ke Xue. 2017 Sep 8;38(9):3970-3978. doi: 10.13227/j.hjkx.201702161.
Adsorption ceramsite (SKC) was prepared with biochar (BC) derived from municipal sludge and kaolin (KL) based on the optimized processing parameters to adsorb ciprofloxacin (CIP) in aqueous solutions. The CIP adsorption mechanism of SKC was investigated by adsorption kinetics and isotherm adsorption models, combined with the analysis of microstructure, pore structure, phase composition, and zeta potential. Furthermore, the heavy metal leaching toxicity was assessed using the toxicity characteristic leaching procedure (TCLP) method. The results showed that SKC, with 60% BC and 40% KL calcining at 1,050℃ for 5 min, showed an outstanding removal efficiency of CIP (65.34%). The pseudo-second-order equation agreed with the adsorption behavior and the Freundlich model described the adsorption process well. The adsorption process was a multilayer adsorption controlled by physical and chemical reactions. The leaching concentration of heavy metals, trapped by the mineral phases in SKC was much lower than that in BC, indicating low ecotoxicological risk. SKC possessed the ability to adsorb CIP with its developed porosity and characteristic mineralogical phases, including silicon aluminum oxide and iron oxide. This work provides a low-cost recyclable sorbing material to remove high concentration CIP from wastewater and offers a new idea for the large-scale safe use of BC.
以城市污泥衍生的生物炭（BC）和高岭土（KL）为原料，基于优化的工艺参数制备了吸附陶粒（SKC），用于吸附水溶液中的环丙沙星（CIP）。通过吸附动力学和等温吸附模型，结合微观结构、孔隙结构、相组成和zeta电位分析，研究了SKC对CIP的吸附机理。此外，采用毒性特性浸出程序（TCLP）法评估了重金属浸出毒性。结果表明，在1050℃下煅烧5分钟的含60% BC和40% KL的SKC对CIP具有优异的去除效率（65.34%）。准二级方程符合吸附行为，Freundlich模型能很好地描述吸附过程。吸附过程是一个受物理和化学反应控制的多层吸附过程。SKC中矿物相捕获的重金属浸出浓度远低于BC中的浸出浓度，表明生态毒理学风险较低。SKC凭借其发达的孔隙率和特征矿物相（包括硅铝氧化物和氧化铁）具有吸附CIP的能力。这项工作提供了一种低成本的可回收吸附材料，用于从废水中去除高浓度的CIP，并为BC的大规模安全利用提供了新思路。
