Composite type adsorbent was prepared by integrating chitosan (Cs) with crosslinked polymethacrylic acid (PMA) and nano sized halloysite nanotube (HNT). The structure of the resulting Cs-PMA/HNT adsorbents was characterized by FTIR, NMR, XRD, TGA, SEM/EDX and rheological properties. These functional adsorbents were used for removal of Pb(II) and Cd(II) as single and binary competitive mixtures from water. There was a significant improvement in adsorption properties of crosslinked PMA in the presence of Cs and HNT. The effect of synthesis parameters such as wt.% of Cs and HNT on swelling and process parameters such as solution pH, adsorbent dosage, contact time and feed concentration on adsorption of metal ions from water were studied in batch experiments. For a feed concentration of 100 mg/L of metal ion, an adsorbent dose of 0.25 g/L and a solution pH of 6, the Cs-PMA/HNT composite adsorbent containing 4 wt% Cs and 3 wt% HNT showed an adsorption capacity (mg/g)/removal% of 357.4/89.4 and 341.6/85.4 for single Pb(II) and Cd(II), respectively which reduced to 313.7/78.4 and 303.6/77.3 for the same metal ions in their binary mixtures in water.

中文翻译：

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壳聚糖基纳米复合吸附剂的合成，表征及在水中吸附Pb（II）和Cd（II）二元混合物的应用

复合型吸附剂是通过将壳聚糖（Cs）与交联的聚甲基丙烯酸（PMA）和纳米级埃洛石纳米管（HNT）集成在一起而制备的。通过FTIR，NMR，XRD，TGA，SEM / EDX和流变学性质对所得的Cs-PMA / HNT吸附剂的结构进行了表征。这些功能性吸附剂用于从水中去除Pb（II）和Cd（II）的单一和二元竞争混合物。在Cs和HNT存在下，交联PMA的吸附性能有了显着改善。通过分批实验研究了合成参数（如Cs和HNT的重量百分比）对溶胀的影响以及工艺参数（如溶液的pH值，吸附剂量，接触时间和进料浓度）对金属离子从水中吸附的影响。对于100 mg / L的金属离子进料浓度，吸附剂剂量为0。