Preparation of Polyacrylonitrile Initiated by Modified Corn Starch and Adsorption for Mercury after Modification
2014
Xu, Yuanyaun | Hao, Zhihai | Chen, Hou | Sun, Jinming | Wang, Dongju
Well-defined polyacrylonitrile (PAN) was precisely synthesized via a single electron transfer-living radical polymerization (SET-LRP) initiated by corn starch modified by bromoacetyl bromide (CS-Br) with La/hexamethylenetetramine (HMTA) as a catalyst system and ascorbic acid (VC) as the reductant. Amidoxime (AO) groups as adsorption functional groups were obtained via cyano groups of PAN resins modified by hydroxylamine hydrochloride. The adsorption for mercury was discussed and the maximum uptake was 4.12 mmol/g. Film diffusion and a pseudo-second-order model were better to interpret the adsorption process. The Langmuir model was appropriate to describe the adsorption isothermal process.
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