羧甲基纤维素钠/坡缕石(CMC/PGS)复合材料的制备及其对Pb(Ⅱ)的吸附

Preparation of Carboxymethyl Cellulose/Palygorskite(CMC/PGS) and Adsorption Property for Pb(Ⅱ)

碱性条件下,将羧甲基纤维素钠(CMC)负载到γ-(2,3-环氧丙氧)丙基三甲氧基硅烷(KH-560)修饰的坡缕石(PGS)表面,得到羧甲基纤维素钠/坡缕石(CMC/PGS)复合材料,利用FT-IR、XRD和SEM/EDS对其进行表征。考察了溶液pH值、吸附时间、吸附温度、Pb^(2+)浓度对Pb^(2+)吸附量的影响,当温度为291 K时,在初始质量浓度为100 mg/L、pH=5.0的Pb^(2+)水溶液中,加入10 mg吸附剂对Pb^(2+)的最大吸附量是97.8 mg/g,该吸附剂对Pb^(2+)的等温吸附曲线属于Langmuir型。

The materials were prepared by combining sodium carboxymethyl cellulose and palygorskite using γ-（ 2, 3-epoxypropoxy）propytrimethoxysilane （KH-560） as the crosslinking agent in alkaline solution. The materials were characterized by FT-IR, XRD and SEM/EDS analysis techniques. The effects adsorption ability of CMC/PGS for Pb^2＋ were studied such as solution pH values, time of adsorption, temperature of adsorption and solution concentration of Pb^2＋. The results indicated that the maximum adsorption capacity for Pb^2＋ was 97.8 mg/g at 291 K, pH 5.0 and the amount of the adsorbent was 10 mg when the initial concentration of Pb^2＋ was 100 mg/L. The adsorption isotherms of Pb^2＋ could be well described with the Langmuir equation.