摘要
铬是污染性金属元素,铬含量是水质污染控制的一项重要指标,其中Cr(Ⅵ)的毒性最大,且易被人体吸收.本研究以水中的Cr(Ⅵ)吸附传质分离为目标,利用以铝为金属源水热法合成的铝基MOFs为前驱体,600℃煅烧后制备了多孔掺碳Al_(2)O_(3)吸附材料,利用现代分析技术对其进行微观结构表征,探究了其吸附作用能力与机制.研究结果表明,XRD、SEM、BET等表征手段证明了NH_(2)-MIL-53(Al)与多孔掺碳Al_(2)O_(3)结构的成功合成.前驱体NH_(2)-MIL-53(Al)和煅烧后的衍生物多孔掺碳Al_(2)O_(3),在形貌上相似,且多孔掺碳Al_(2)O_(3)材料(180.24 m^(2)·g^(-1))的比表面积要大于NH_(2)-MIL-53(Al)(116.73 m^(2)·g^(-1)).多孔掺碳Al_(2)O_(3)材料对Cr(Ⅵ)的平衡吸附量最大可达到671.56 mg·g^(-1).吸附动力学模型拟合结果显示,多孔掺碳Al_(2)O_(3)材料对Cr(Ⅵ)的吸附行为与Langmuir等温线模型和伪二阶动力学模型更加拟合.研究显示,多孔掺碳Al_(2)O_(3)材料可以作为除Cr材料实现对Cr(Ⅵ)的高效去除.
Chromium is a pollutant metal element,and its content is an important index of water pollution control,among which Cr(Ⅵ)is the most toxic and easily absorbed by the human body.In this study,the adsorption and mass transfer separation of Cr(Ⅵ)in water was taken as the goal,and the porous carbon-doped Al_(2)O_(3) adsorption material was prepared by calcination at 600℃using aluminum-based MOFs synthesized by hydrothermal method with aluminum as metal source.The microstructure was characterized by modern analytical technology,and the adsorption capacity and mechanism were explored.The results showed that XRD,SEM,BET and other characterization methods proved the successful synthesis of NH_(2)-MIL-53(Al)and porous carbon-doped Al_(2)O_(3) structure.The precursor NH_(2)-MIL-53(Al)and the calcined derivative porous carbon-doped Al_(2)O_(3) are similar in morphology,and the specific surface area of porous carbon-doped Al_(2)O_(3) material(180.24 m^(2)·g^(-1))is larger than that of NH_(2)-MIL-53(Al)(116.73 m^(2)·g^(-1)).The maximum equilibrium adsorption capacity of Cr(Ⅵ)on porous carbon-doped Al_(2)O_(3) material is 671.56 mg·g^(-1).The fitting results of the adsorption kinetics model show that the adsorption behavior of porous carbon doped Al_(2)O_(3) material for Cr(Ⅵ)is more consistent with the Langmuir isotherm model and pseudo-second-order kinetics model.The study shows that porous carbon-doped Al_(2)O_(3) material can be used as a Cr removal material to achieve effective removal of Cr(Ⅵ).
作者
王兵
曾瑶
李爽
熊明洋
邱瑞斯
WANG Bing;ZENG Yao;LI Shuang;XIONG Mingyang;QIU Ruisi(School of Chemistry and Chemical Engineering of Southwest Petroleum University,Chengdu,610500,China;Key Laboratory of Environmental Pollution Prevention on Oil and Gas Fields and Environmental Safety in Sichuan:Chengdu,610500,China)
出处
《环境化学》
CAS
CSCD
北大核心
2024年第1期349-358,共10页
Environmental Chemistry
