Key Laboratory of Resources and Environment Chemistry of West China, Hexi University, Zhangye 734000, China.
J Environ Sci (China). 2010;22(1):7-14. doi: 10.1016/s1001-0742(09)60068-1.
The adsorption of Methyl Violet (MV) cationic dye from aqueous solution was carried out by using crosslinked poly (acrylic acid-coacrylamide)/attapulgite (Poly(AA-co-AM)/ATP) composite as adsorbent. The factors influencing adsorption capacity of the composite such as pH, concentration of the dye, temperature, contact time, adsorbent dosage, ionic strength and surfactant were systematically investigated. The equilibrium data fitted very well to the Langmuir isotherm and the maximum adsorption capacity reached 1194 mg/g at 30 degrees C. The thermodynamic parameters including deltaG0, deltaH0 and deltaS0 for the adsorption processes of MV on the composite were also calculated, and the negative deltaH0 and deltaG0 confirmed that the adsorption process was exothermic and spontaneous. The kinetic studies showed that the adsorption process was consistent with the pseudo second-order kinetic model and the desorption studies revealed that the regeneration of the composite adsorbent can be easily achieved.
采用交联的聚丙烯酸-丙烯酰胺/凹凸棒土（Poly(AA-co-AM)/ATP）复合材料作为吸附剂，从水溶液中吸附亚甲基蓝（MV）阳离子染料。系统研究了影响复合材料吸附容量的因素，如 pH 值、染料浓度、温度、接触时间、吸附剂用量、离子强度和表面活性剂。平衡数据非常符合朗缪尔等温线，在 30°C 时最大吸附容量达到 1194mg/g。还计算了吸附过程的热力学参数，包括复合吸附剂上 MV 的吸附过程的ΔG0、ΔH0 和ΔS0，负的ΔH0 和ΔG0 证实吸附过程是放热和自发的。动力学研究表明，吸附过程符合准二级动力学模型，解吸研究表明，复合材料吸附剂的再生可以很容易地实现。
