不同热解温度制备的鸽粪生物炭对水中甲砜霉素的吸附性能  

Adsorption properties of thiamphenicol from water by pigeon feces biochar prepared at different pyrolysis temperatures

作　　者：康雅欣 亢昕 李东鹏 孙铸宇 宋新山[1] 赵晓祥[1] KANG Yaxin;KANG Xin;LI Dongpeng;SUN Zhuyu;SONG Xinshan;ZHAO Xiaoxiang(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《东华大学学报（自然科学版）》2021年第6期100-108,共9页Journal of Donghua University(Natural Science)

基　　金：国家自然科学基金(21906016);国家重点研发计划(2019YFC0408604);中央高校基本科研业务费专项资金(2232020D-25)。

摘　　要：为探究不同热解温度制备的生物炭对抗生素吸附特性的差异,以鸽粪为原料,经马弗炉600、700、800℃限氧热解制备P600、P700、P800等3种生物炭。分析3种鸽粪生物炭的元素组成、表面形态、官能团、理化性质等的差异,探究不同因素(pH值、盐离子强度等)对其吸附水中甲砜霉素(thiamphenicol, TAP)的影响。结果表明:热解温度由600℃升高至800℃,鸽粪生物炭的pH值、氧元素质量分数、比表面积和孔径、TAP平衡吸附量均明显增加;在25℃、TAP初始质量浓度为20 mg/L、t=4 h条件下,P800对TAP的平衡吸附量(33.63 mg/g)显著高于P600(5.72 mg/g),表明热解温度对鸽粪生物炭吸附TAP的性能有显著影响。3种鸽粪生物炭的吸附过程符合Elovich动力学方程和Freundlich等温模型,证实该吸附过程是发生在不均匀表面的多相、多层化学吸附,而疏水作用、氢键作用以及静电作用是可能存在的化学吸附机制。To explore the difference of antibiotic adsorption performance of biochar prepared at different pyrolysis temperatures, three biochars(P600, P700, P800) were prepared by pigeon feces through oxygen restricted pyrolysis at the temperature of 600, 700, 800 ℃. The differences in elemental composition, surface morphology, functional groups and physicochemical properties of the three biochars were analyzed to investigate the effects of different factors(pH value, salt ion strength, etc.) on the adsorption of thiamphenicol(TAP) in water. The results illustrate that as the pyrolysis temperature increases from 600 ℃ to 800 ℃, the pH value, mass fraction of oxygen element, specific surface area and pore diameter, as well as TAP equilibrium adsorption capacity of pigeon feces biochar increase significantly. At 25 ℃, initial mass concentration of TAP is 20 mg/L, t=4 h, the equilibrium adsorption capacity of P800 on TAP(33.63 mg/g) is significantly higher than that of P600 on TAP(5.72 mg/g), indicating that pyrolysis temperature has a significant influence on the adsorption performance of TAP by pigeon feces biochar. The adsorption process of the three pigeon feces biochars is best fitted by the Elovich kinetic equation and Freundlich isothermal model, which implies that the adsorption process is a multi-phase and multi-layer chemical adsorption on heterogeneous surfaces. The hydrophobic interaction, hydrogen bonding and electrostatic interaction are the possible chemical adsorption mechanisms.

关 键 词：吸附剂 鸽粪生物炭 吸附特性 甲砜霉素 

分 类 号：X703[环境科学与工程—环境工程]