Department of Chemistry, RTM Nagpur University, Nagpur 440 033, India.
National College, Tiruchirapalli, Tamilnadu, India.
Carbohydr Polym. 2016 Aug 1;146:264-73. doi: 10.1016/j.carbpol.2016.03.041. Epub 2016 Mar 19.
Ionic solid (Ethylhexadecyldimethylammoniumbromide) impregnated phosphated chitosan (ISPC) was synthesized and applied for enhanced adsorption of hexavalent chromium from industrial effluent. The compound obtained was extensively characterized using instrumental techniques like FT-IR, TGA-DTA, XRD, SEM, BET and EDX. ISPC showed high adsorption capacity of 266.67mg/g in accordance with Langmuir isotherm model at pH 3.0 due to the presence of multiple sites which contribute for ion pair and electrostatic interactions with Cr(VI) species. The sorption kinetics and thermodynamic studies revealed that adsorption of Cr(VI) followed pseudo-second-order kinetics with exothermic and spontaneous behaviour. Applicability of ISPC for higher sample volumes was discerned through column studies. The real chrome plating industry effluent was effectively treated with total chromium recovery of 94%. The used ISPC was regenerated simply by dilute ammonium hydroxide treatment and tested for ten adsorption-desorption cycles with marginal decrease in adsorption efficiency.
离子固载化（十六烷基二甲基溴化铵）磷酸化壳聚糖（ISPC）被合成出来，并应用于从工业废水中增强吸附六价铬。使用 FT-IR、TGA-DTA、XRD、SEM、BET 和 EDX 等仪器技术对所得到的化合物进行了广泛的表征。ISPC 在 pH 3.0 下，根据朗缪尔等温线模型，表现出 266.67mg/g 的高吸附容量，这是由于存在多个位点，这些位点有助于与 Cr(VI)物种形成离子对和静电相互作用。吸附动力学和热力学研究表明，Cr(VI)的吸附遵循准二级动力学，具有放热和自发的行为。通过柱研究发现，ISPC 对更高体积的样品具有适用性。实际的镀铬工业废水得到了有效处理，总铬回收率为 94%。用过的 ISPC 可以通过稀氨水处理进行简单再生，并进行了十次吸附-解吸循环测试，吸附效率略有下降。
