摘要
以废弃牡丹壳为原料,通过浸渍-煅烧的方法,制备了类石墨烯多孔炭(PGCs)。借助TEM、XRD和BET分析仪等对PGCs进行了表征,考察了溶液pH值、吸附时间和温度等因素对PGCs去除四环素(TC)性能影响。结果表明:PGCs材料具有较高石墨度、比表面积(3626.2 m^(2)·g^(-1))、孔容(1.035 cm^(3)·g^(-1)),以及丰富的含氧表面官能团;在pH值=3~11、盐离子存在条件下(c_(Na_(2)SO_(4)/NaCl)=0.1~0.5 mol/L),该材料对TC均表现出良好的吸附性能;吸附为自发吸热过程,符合Freundlich等温吸附和Pseudo-second-order动力学模型,25℃时平衡吸附量为858.0 mg·g^(-1)。经过5次吸附-解吸后,吸附量仍保持在500 mg·g^(-1)以上。结合表征分析和吸附研究,认为PGCs材料对TC的高效吸附得益于其高比表面积和多级孔结构,以及表面C=O和sp^(2)碳等活性基团间发生的较强相互作用。
Porous graphene-like carbon derived from peony-seed shells(PGCs)was prepared by impregnation-calcination method.The as-prepared material was characterized by a variety of techniques such as transmission electron microscopy(TEM),X-ray diffraction(XRD)and nitrogen adsorption-desorption instrument.The influences of solution pH,time and temperature on the adsorption of tetracycline(TC)onto PGCs were investigated and the results showed that PGCs had high graphitic degree,specific surface area(3626.2 m^(2)·g^(-1)),pore volume(1.035 cm^(3)·g^(-1))and abundant functional groups containing oxygen.The PGCs material maintained better adsorption performance for TC when the solution pH changed within a large range(3.0~11.0).In addition,the adsorption of TC on PGCs was also not subject to the fluctuation of salinity(c_(Na_(2)SO_(4)/NaCl)=0.1~0.5 mol/L).The adsorption was a spontaneous and endothermic process,which conformed to Freundlich isotherm and Pseudo-second-order models,and the equilibrium adsorption capability was of 858.0 mg·g^(-1) at 25℃.After five cycles of sorption-desorption,the adsorption capacity of PGCs for TC remained above 500 mg·g^(-1).Combined the characterization analysis and adsorption studies,it could be concluded that the adsorption of TC benefited from the high specific surface area and hierarchical pore structure of PGCs,as well as the active groups such as C=O and sp^(2) C on its surface.
作者
刘琼
刘萍
龙娜
Liu Qiong;Liu Ping;Long Na(School of Environmental Engineering and Chemistry,Luoyang Institute of Science and Technology,Luoyang 471000,China)
出处
《山东化工》
CAS
2023年第20期1-5,10,共6页
Shandong Chemical Industry
基金
河南省高等学校重点科研项目(21B610009)
洛阳理工学院高层次人才科研项目(2019BZ17)。
关键词
牡丹壳
类石墨烯多孔炭
吸附
四环素
peony-seed shell
porous graphene-like carbon
adsorption
tetracycline
