摘要
为研究绿锈(GR)对四环素(TC)的吸附性能,考察了投加量、pH值和天然有机物对GR吸附TC的影响.结果表明:GR吸附四环素的去除率高达99.19%,随着GR投加量的增加,TC去除率随之增加,TC吸附容量逐渐降低,pH值对GR吸附TC无明显影响,20 mg·L-1的黄腐酸(FA)能够提高GR对TC的吸附容量.通过拟合动力学模型发现GR吸附TC更符合拟二级吸附动力学,说明GR吸附TC主要为化学作用吸附.通过拟合吸附等温线模型发现GR吸附TC更符合Langmuir吸附等温线模型,属于单层吸附.综合红外光谱表征结果说明GR吸附TC的机理有静电作用、表面络合及氢键作用.
To study the adsorption property of tetracycline(TC) by green rust(GR),the effects of dosage,pH value and natural organic matter on the adsorption of TC by GR were investigated.The results show that the removal rate of the adsorption of TC by GR is as high as 99.19%. With the increase of GR dosage, the removal rate of TC increases, and the adsorption capacity of TC decreases gradually.The pH value has no significant effect on TC adsorption by GR.20 mg·L-1 fulvic acid(FA) can increase the adsorption capacity of GR to TC.By fitting the kinetic model,it is found that the adsorption of TC by GR is more in line with the pseudo-second-order adsorption kinetics,indicating that the adsorption of TC by GR is mainly chemical adsorption.By fitting the adsorption isotherm model,it is found that the adsorption of TC by GR is more consistent with Langmuir adsorption isotherm model and belongs to monolayer adsorption. Combined with the results of infrared spectroscopy characterization, it shows that the mechanism of the adsorption of TC by GR includes electrostatic interaction,surface complexation and hydrogen bonding.
作者
韩莹
吴召
刘宏远
梅铃钦
HAN Ying;WU Zhao;LIU Hongyuan;MEI Lingqin(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第8期121-126,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
浙江省自然科学基金资助项目(LY21E080015)
国家自然科学基金资助项目(51508510)
浙江工业大学校级创新创业训练计划项目(cxcy2019059)。
关键词
四环素
绿锈
吸附
动力学
等温线模型
tetracycline
green rust
adsorption
kinetics
isotherm model
