Electro-Membrane Processes Division, Central Salt & Marine Chemicals Research Institute, Council of Scientific & Industrial Research, GB Marg, Bhavnagar 364002, Gujarat, India.
J Hazard Mater. 2009 Dec 30;172(2-3):1041-8. doi: 10.1016/j.jhazmat.2009.07.108. Epub 2009 Aug 4.
Crosslinked chitosan/poly(vinyl alcohol) (PVA) beads were prepared by suspension of chitosan-PVA aqueous solution in a mixture of toluene and chlorobenzene. Some quantity of the water was distilled out as an azeotrope along with toluene-chlorobenzene and the droplets were chemically crosslinked by adding glutaraldehyde. The prepared crosslinked beads were characterized by FTIR, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The developed beads were used as an adsorbent for the adsorption of Cd(II) from wastewater. Effect of time, temperature, pH, adsorbent dose and adsorbate concentration on the adsorption of Cd(II) were investigated in batch process and pseudo-first and pseudo-second-order kinetic models were also evaluated. The equilibrium adsorption obeyed Langmuir and Freundlich isotherms as well as the thermodynamic parameters such as DeltaG degrees , DeltaH degrees and DeltaS degrees were calculated. From thermodynamic data, it was found that the adsorption process was endothermic and spontaneous. The maximum adsorption of Cd(II) ions was found to be 73.75% at pH 6 and indicated that developed material could be effectively utilized for the removal of Cd(II) ions from wastewater.
交联壳聚糖/聚乙烯醇（PVA）珠粒是通过将壳聚糖-PVA 水溶液悬浮在甲苯和氯苯的混合物中制备的。一部分水与甲苯-氯苯形成共沸物被蒸馏出来，并且通过添加戊二醛使液滴发生化学交联。所制备的交联珠粒通过傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）和扫描电子显微镜（SEM）进行了表征。开发的珠粒可用作从废水中吸附 Cd(II) 的吸附剂。在批处理过程中研究了时间、温度、pH、吸附剂剂量和吸附质浓度对 Cd(II)吸附的影响，并评估了拟一级和拟二级动力学模型。平衡吸附符合 Langmuir 和 Freundlich 等温线，并且计算了热力学参数如 DeltaG 度、DeltaH 度和 DeltaS 度。从热力学数据可以看出，吸附过程是吸热和自发的。在 pH 6 时，Cd(II)离子的最大吸附率为 73.75%，表明开发的材料可以有效地用于从废水中去除 Cd(II)离子。
