Department of Polymer Science and Technology, University of Calcutta 92, A.P.C. Road, Kolkata-700009, India.
KIIT School of Biotechnology, KIIT University Campus-XI, Patia, Bhubaneswar 751024, Orissa, India.
Carbohydr Polym. 2016 Nov 5;152:41-50. doi: 10.1016/j.carbpol.2016.06.064. Epub 2016 Jun 24.
Noble copolymers from xanthan gum (XG) and poly(acrylic acid) (PAA) were synthesised through surfactant mediated graft copolymerization. The copolymers were applied as a biosorbent for inorganic Hg(II) at higher concentration level (300ppm). The copolymers were characterized using different analytical techniques which showed, the grafting principally occurred across the amorphous region of XG. Measurement of zeta potential and hydrodynamic size indicated, the copolymers were strong polyanion and possessed greater hydrodynamic size (almost in all cases) than XG, despite a strong molecular degradation that took place simultaneously during grafting. In the dispersed form, all grades of the copolymer displayed higher adsorption capability than XG, however, the grade with maximum grafting produced the highest efficiency (68.03%). Manipulation produced further improvement in efficiency to 72.17% with the same copolymer after 75min at a pH of 5.0. The allowable biosorbent dose, however, was 1000ppm as determined from the experimental evidences.
通过表面活性剂介导的接枝共聚反应，从黄原胶（XG）和聚丙烯酸（PAA）合成了高分子共聚物。在高浓度（300ppm）下，共聚物被用作无机 Hg(II) 的生物吸附剂。通过不同的分析技术对共聚物进行了表征，结果表明，接枝主要发生在 XG 的无定形区域。zeta 电位和水动力粒径的测量表明，共聚物是强聚阴离子，并且具有比 XG 更大的水动力粒径（几乎在所有情况下），尽管在接枝过程中同时发生了强烈的分子降解。在分散形式下，所有等级的共聚物都显示出比 XG 更高的吸附能力，然而，在 pH 值为 5.0 下，经过 75min 的处理，接枝量最大的共聚物的效率最高（68.03%）。通过实验证据，可允许的生物吸附剂剂量为 1000ppm。
