摘要
以马尾藻为原料,通过180℃水热解结合500℃氯化锌改性干热解制备了HTC180/Zn500生物炭.该生物炭具有大孔径多片层结构,每层分布大量蜂窝状孔隙,比表面积达1026.37 m^(2)·g^(-1).FTIR、XPS及Raman分析表明,HTC180/Zn500表面富含含氧基团,可形成更多的吸附和催化活性位点,从而促进污染物的去除.等温吸附和动力学实验结果显示,HTC180/Zn500对恩诺沙星(ENR)的吸附行为符合Langmuir等温吸附模型和准二级动力学模型,在25℃时的最大吸附容量为456.5576 mg·g^(-1).此外,pH值对ENR的去除率有显著影响,这主要受HTC180/Zn500表面带电状态及ENR存在形式的调控.在避光条件下,pH=7时反应12 h后,HTC180/Zn500对ENR的去除率可达98.5%,通过甲酸-乙腈溶液萃取分离ENR分析发现,去除作用中吸附率为78.5%,降解率为20%. 5次循环实验结果表明,HTC180/Zn500对ENR的去除率依次为98.5%、91.22%、85.56%、75.26%和74.69%,经再生处理后,去除率恢复至93.35%.进一步分析表明,HTC180/Zn500去除ENR的机理包括物理吸附、孔隙填充、静电吸附、络合作用、π-π作用、普通氢键、电荷辅助氢键以及·OH和PFRs的降解作用.
HTC180/Zn500 biochar was prepared through the combination of hydrothermal decomposition(at 180℃)and zinc chloride-modified dry pyrolysis(at 500℃),using Sargassum as the raw material.The obtained biochar exhibited a large-pore,multi-layered structure with each layer containing numerous honeycomb-like pores,reaching a specific surface area of 1026.37 m^(2)·g^(-1).FTIR,XPS,and Raman analyses demonstrated confirmed abundant oxygen-containing groups onthat the surface of HTC180/Zn500 was rich in oxygen-containing groups,which can forming more adsorption and catalytic active sites,thereby promoting the removal of pollutants.The isothermal adsorption and kinetic experiments revealed that the adsorption behavior of HTC180/Zn500 towards enrofloxacin(ENR)was consistent withfollowed the Langmuir model isothermal adsorption model and the pseudo-second-order kinetics model,achieving a maximum adsorption capacity of 456.5576 mg·g^(-1) at 25℃.Additionally,it was found that the pH value significantly affected influenced the removal rate of ENR,primarily regulated by the surface charge state of HTC180/Zn500 and the existing form of ENR.At pH 7 In darkness and with a pH of 7,the removal rate of ENR by HTC180/Zn500 reached 98.5%after 12 hours of reaction.The analysis of ENR separation through formic acid-acetonitrile solution extraction showed that,during the removal process,adsorption accounted for 78.5%and degradation for 20%of ENR removal.The results of the five cycle experiments tests demonstrated that the removal rates of ENR by HTC180/Zn500 were 98.5%,91.22%,85.56%,75.26%,and 74.69%respectively,with the removal rate recovering to 93.35%following the regeneration treatment.The further mechanistic analysis revealed indicated that the removal of ENR by HTC180/Zn500 involves physical adsorption,pore filling,electrostatic adsorption,complexation,π-π interactions,hydrogen bonding,charge-assisted hydrogen bonding,as well as the degradation mediated by·OH and persistent free radicals(PFRs).-mediated degradation.
作者
王晓云
付爱民
WANG Xiaoyun;FU Aimin(School of Ecological Environment and Urban Construction,Fujian University of Technology,Fuzhou 350008;Fujian Ningde Nuclear Power Company Limited,Ningde 355200)
出处
《环境科学学报》
北大核心
2025年第9期233-248,共16页
Acta Scientiae Circumstantiae
