School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia.
Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia.
Int J Biol Macromol. 2016 Dec;93(Pt A):1231-1239. doi: 10.1016/j.ijbiomac.2016.09.069. Epub 2016 Sep 20.
Cross-linked chitosan/sepiolite composite was prepared from sepiolite clay and chitosan, and was cross-linked using epichlorohydrin. Among the various weight ratio percentage of chitosan and sepiolite clay composites, CS50SP50 was selected as the best adsorbent for both methylene blue (MB) and reactive orange 16 (RO 16). At an optimum adsorbent dosage of 0.2g/100mL, the effects of initial dye concentration (25-400mg/L) and pH (3-11) on MB and RO 16 adsorption onto CS50SP50 composite were studied. Monolayer adsorption capacities of CS50SP50 composite for MB and RO 16 were 40.986mg/g and 190.965mg/g, respectively at 30°C. Freundlich, Langmuir and Temkin isotherms applied on the adsorption data for both the dyes reveal that data fitted best for Freundlich model. For both the dyes pseudo-second-order kinetics were found to describe the adsorption process better than pseudo-first-order kinetics. The adsorption capacity of CS50SP50 composite for both the dyes was found better compared to previous studies thus making it potentially low-cost adsorbent for removal of both cationic and reactive dyes.
壳聚糖/海泡石交联复合材料由海泡石粘土和壳聚糖制备，并使用表氯醇交联。在壳聚糖和海泡石粘土复合材料的各种重量比百分比中，CS50SP50 被选为亚甲蓝（MB）和活性橙 16（RO 16）的最佳吸附剂。在最佳吸附剂用量为 0.2g/100mL 时，研究了初始染料浓度（25-400mg/L）和 pH（3-11）对 CS50SP50 复合吸附 MB 和 RO 16 的影响。在 30°C 下，CS50SP50 复合材料对 MB 和 RO 16 的单层吸附容量分别为 40.986mg/g 和 190.965mg/g。Freundlich、Langmuir 和 Temkin 等温线应用于两种染料的吸附数据表明，数据最适合 Freundlich 模型。对于两种染料，发现准二级动力学比准一级动力学更能描述吸附过程。CS50SP50 复合材料对两种染料的吸附容量均优于以往研究，因此使其成为去除阳离子和活性染料的潜在低成本吸附剂。
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