硅胶键合醛基型吸附材料的制备及对重金属离子的吸附
发布时间：2019-04-15 19:09
【摘要】：以无机材料硅胶为基体,利用有机硅烷偶联剂KH550、乙二醛和戊二醛为原料进行希夫碱反应,分别合成含有C=N的硅胶键合醛基型吸附材料(乙二醛修饰的为SG-1、戊二醛修饰的为SG-2),并采用红外光谱、热重、扫描电子显微镜和孔结构等分析手段对吸附材料进行了表征。结果表明:(1)从微观上看,硅胶表面较光滑;SG-1、SG-2表面的粗糙度、孔隙率都较硅胶明显增加,有利于吸附实验的进行。(2)拟二级动力学方程更适合描述SG-1、SG-2对重金属离子的吸附行为,吸附过程由化学吸附过程决定。SG-1、SG-2对4种重金属离子的吸附热力学过程适合用Langmuir等温吸附方程解释,其过程是单分子层吸附。(3)SG-1、SG-2对4种重金属离子的静态饱和吸附量均表现为Cu(Ⅱ)Ni(Ⅱ)Pb(Ⅱ)Cr(Ⅵ)。SG-1、SG-2对Cu(Ⅱ)静态饱和吸附量分别达到9.401、9.738mg/g。(4)SG-1、SG-2对4种重金属离子解吸率与解吸液(5%(质量分数)硫脲+0.1mol/L盐酸)体积并不呈现正相关,解吸率基本可达到90%,再生性能良好,当解吸液体积为6mL时解吸率最大。
[Abstract]:Silica gel bonded aldehydes containing C N were synthesized by Schiff base reaction using organic silane coupling agent KH550, Glyoxal and glutaraldehyde as raw materials, respectively (SG-1, modified by Glyoxal). Glutaraldehyde modified as SG-2) was characterized by IR, TG, SEM and pore structure. The results show that: (1) from the microscopic point of view, the surface of silica gel is smooth; The roughness and porosity of SG-1,SG-2 surface are obviously higher than that of silica gel, which is beneficial to the adsorption experiment. (2) the pseudo-second-order kinetic equation is more suitable to describe the adsorption behavior of heavy metal ions by SG-1,SG-2. The adsorption process is determined by the chemisorption process. SG-1, SG-2 adsorption thermodynamic process for four heavy metal ions is suitable to be explained by the Langmuir isotherm adsorption equation, and the adsorption process is monolayer adsorption. (3) SG-1,. The static saturated adsorption capacity of SG-2 to four heavy metal ions is Cu (鈪，
本文编号：2458404
[Abstract]:Silica gel bonded aldehydes containing C N were synthesized by Schiff base reaction using organic silane coupling agent KH550, Glyoxal and glutaraldehyde as raw materials, respectively (SG-1, modified by Glyoxal). Glutaraldehyde modified as SG-2) was characterized by IR, TG, SEM and pore structure. The results show that: (1) from the microscopic point of view, the surface of silica gel is smooth; The roughness and porosity of SG-1,SG-2 surface are obviously higher than that of silica gel, which is beneficial to the adsorption experiment. (2) the pseudo-second-order kinetic equation is more suitable to describe the adsorption behavior of heavy metal ions by SG-1,SG-2. The adsorption process is determined by the chemisorption process. SG-1, SG-2 adsorption thermodynamic process for four heavy metal ions is suitable to be explained by the Langmuir isotherm adsorption equation, and the adsorption process is monolayer adsorption. (3) SG-1,. The static saturated adsorption capacity of SG-2 to four heavy metal ions is Cu (鈪，
本文编号：2458404
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