摘要
金霉素是一种广谱性抗生素,在水中溶解度高且不易为微生物降解,是威胁环境安全和人畜健康的潜在隐患。以榆中县某污水厂浓缩污泥为基体制备生物炭,通过化学沉淀在其表面负载Fe&Cu颗粒用于处理金霉素废水。结果表明,负载Fe&Cu颗粒后的生物炭对金霉素的吸附率显著提高至98.56%,相比初始生物炭提高了81.08%。当材料的投加量控制在5 g·L^(−1),CTC质量浓度控制在500 mg·L^(−1),溶液pH=4,Fe꞉Cu物质的量比为3꞉1时,生物炭脱除金霉素能力达到峰值386.93 mg·g^(−1)。SEM及BET验证了材料的高表面积及多孔结构。吸附等温线、动力学和热力学的分析结果表明,复合材料对金霉素的去除符合准二级动力学模型,吸附方式被认为是物理化学吸附和吸热过程。各类表征的结果也表明吸附机制可以归结于氢键结合、π-π堆积作用、金属配位、静电吸引以及电子转移等作用。研究结果表明合成的材料是高效的金霉素吸附剂,为金霉素引起的污染水体处理提供了一定思路。
Chlortetracycline is a broad-spectrum antibiotic.It has high solubility in water and is not easily degraded by microorganisms,which is a potential hazard to environmental safety and human and animal health.At present,the adsorption method is an efficient method for treating chlortetracycline wastewater.Sludge biochar contains rich functional groups and good pore structure.It is widely used to treat antibiotic wastewater.In the experiment,biochar was prepared from the concentrated sludge of a sewage plant in Yuzhong County,and Fe&Cu particles were loaded on the surface by the chemical precipitation method and used to treat chlortetracycline wastewater.The results showed that the adsorption rate of chlortetracycline on biochar loaded with Fe&Cu particles was significantly increased to 98.56%,which was 81.08%higher than that of biochar.When the dosage of the material is controlled at 5 g·L^(−1),the CTC concentration is controlled at 500 mg·L^(−1),the pH=4,and the ratio of Fe꞉Cu substance is 3꞉1.The ability of biochar to remove chlortetracycline reached a peak of 386.93 mg·g^(−1).SEM and BET results verify the high surface area and porous structure of the material.The analysis results of adsorption isotherm,kinetics and thermodynamics show that the removal of chlortetracycline by the composite material conforms to the quasi-second-order kinetic model.The way of adsorption is considered to be a physical and chemical adsorption and endothermic process.The results of various characterizations also show that the adsorption mechanism can be attributed to the effects of hydrogen bonding,π-π interaction,metal coordination,electrostatic attraction,and electron transfer.The results prove that the synthesized material is an efficient chlortetracycline adsorbent.And it provides a certain idea for the treatment of chlortetracycline.
作者
魏茁
姜英宇
陈立飞
周瀚成
WEI Zhuo;JIANG Yingyu;CHEN Lifei;ZHOU Hancheng(School of Chemical Engineering,Northwest Minzu University,Lanzhou 730124,China)
出处
《生态环境学报》
CSCD
北大核心
2021年第4期805-815,共11页
Ecology and Environmental Sciences
基金
国家自然科学青年基金项目(21203150,21962016)
甘肃省科技支撑计划项目(144GKCA031)
中央高校基金项目(31920180046)。
关键词
生物炭
Fe&Cu修饰
金霉素
吸附机制
复合材料
动力学
热力学
biochar
Fe&Cu modification
chlortetracycline
adsorption mechanism
composite materials
kinetics
thermodynamics
