【摘 要】
：
Chitosan (CTS), a natural biopolymer, has been proved to be an efficient adsorbent for removing toxic heavy metal ions in waste water [1].Montmorillonite (MMT), a cheap and abundant natural clay, is c
【机 构】
：
Key Laboratory of Applied Surface and Colloid Chemistry (Shaanxi Normal University), Ministry of Edu
【出 处】
：
The 6th Joint China-Japan Chemical Engineering Symposium(第六届
论文部分内容阅读
Chitosan (CTS), a natural biopolymer, has been proved to be an efficient adsorbent for removing toxic heavy metal ions in waste water [1].Montmorillonite (MMT), a cheap and abundant natural clay, is considered one of the most promising candidates in decontamination and disposal of waste water having high-level heavy metals [2].Thus, the combination of MMT and CTS may create a more efficient adsorbent possessing both the merits of each component.In this work, MMT was modified with CTS having different molecular weights (4× 106, 2× 105, 5 × 1 04, 3000), and Co2+, which is commonly present in industrial waste water, was selected as a model cation of heavy metals.The CTS-MMT were characterized by SEM, XRD and FT-IR.The clear increase of interlayer distance of MMT as revealed from XRD results of CTS-MMT indicates the intercalation of CTS into MMT.Together with the results of SEM and FT-IR, it is conclusive that composite material of CTS-MMT was successfully prepared irrespective of the molecular weight of CTS.The representive sorption results of Co2+ on different adsorbents are given in Table 1.Irrespective of the initial concentration of Co2+, CTS-MMT (2×105) showed superior performance than CTS.The adsorption isotherms of Co2+ on different adsorbents were analyzed based on Langmuir, Freundlich, and Temkin equations.Independent on the adsorbents, Temkin equation best fit all the results, indicating a multilayer adsorption of Co2+ on adsorption sites having different energies.Kinetic study revealed that the adsorption of Co2+ on CTS-MMT followed the pseudo-second order equation, indicating that chemical sorption is the rate-limiting step.The detailed results and thorough discussion will be given in the full paper.
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