摘要
为了解决单一材料处理含重金属离子废水的局限性,采用膨润土和钢渣两者复合制备碱性颗粒,通过宏观与微观相结合的手段,探究膨润土碱性复合颗粒吸附剂对Cu、Zn的吸附聚沉机理。结果表明,复合颗粒对Cu^(2+)、Zn^(2+)的吸附符合多分子层吸附(BET)理论,动力学方程符合拟二级动力学方程,说明吸附过程同时伴随着物理吸附与化学吸附。通过对吸附后的碱性颗粒进行X射线衍射(XRD)、扫描电镜(SEM)表征,分析其形貌结构及矿物相的变化。结果表明,吸附Cu^(2+)、Zn^(2+)后,复合颗粒的层间距由1.549 nm分别增加到1.593 nm和1.643 nm,说明Cu^(2+)、Zn^(2+)进入了复合颗粒的层间,使层间距变大,发生离子交换作用。同时,复合颗粒中增加了新的矿物相,如Na_(2)CuSi_(3)O_(8)、Ca_(2)CuO_(3)、Cu_(5)(SiO_(3))_(4)(OH)_(2)、Zn_(4)Si_(2)O_(7)(OH)_(2)、Ca_(2)ZnSi_(2)O_(7)等,说明存在表面络合反应,碱性矿物相可以与Cu^(2+)、Zn^(2+)发生沉淀反应,实现对重金属离子的吸附-聚沉,是一种优良的吸附剂。
In order to solve the limitations of a single material to treat wastewater containing heavy metal ions,the bentonite and steel slag were used to prepare alkaline particles.The adsorption and aggregation mechanism of bentonite alkaline composite particles adsorbent on Cu,Zn was explored by combining macroscopic and microscopic means.The results show that the adsorption of composite particles on Cu^(2+),Zn^(2+)is in accordance with the BET multimolecular layer adsorption,and the kinetic equation is in accordance with the proposed second-degree kinetic equation,which indicates that the adsorption process is accompanied by both physical adsorption and chemical adsorption.The morphology,structure and mineral phases of the adsorbed alkali particles were analyzed by XRD and SEM characterization.The results show that the layer spacings of the composite particles increase from 1.549 nm to 1.593 nm and 1.643 nm after the adsorption of Cu^(2+)and Zn^(2+),indicating that Cu^(2+)and Zn^(2+)enter into the interlayer of the composite particles,which make the layer spacing larger,and the ion exchange occurres.At the same time,new mineral phases such as Na_(2)CuSi_(3)O_(8),Ca_(2)CuO_(3),Cu_(5)(SiO_(3))_(4)(OH)_(2),Zn_(4)Si_(2)O_(7)(OH)_(2),Ca_(2)ZnSi_(2)O_(7)are added into the composite particles,indicating that there is the existence of surface complexation reaction,and the alkaline mineral phases can have the precipitation reaction with Cu^(2+)and Zn^(2+)to achieve adsorptionpolymerisation of heavy metal ions,which is an excellent adsorbent.
作者
耿莘惠
杨曦
刘羡鱼
马哲
盖科函
Geng Xinhui;Yang Xi;Liu Xianyu;Ma Zhe;Gai Kehan(School of Municipal and Environmental Engineering,Shenyang Institute of Urban Construction,Shenyang,Liaoning 110167)
出处
《非金属矿》
2024年第5期103-107,共5页
Non-Metallic Mines
基金
辽宁省教育厅高等学校基本科研项目(LJKQZ20222294,JYTQN2023377)
沈阳城市建设学院科学研究发展基金项目(XKJYB-202409,XKJ-ZD-202402)。
关键词
膨润土
钢渣
碱性颗粒
XRD
SEM
吸附聚沉
bentonite
steel slag
alkaline particles
XRD
SEM
adsorption-polymerisation
