中文摘要：

以粉煤灰（fly ash,FA）为原材料,通过负载壳聚糖（CTS）及镁离子制备新型吸附材料-Mg/CTS/FA,探察了pH、吸附剂的添加量、转速、接触时间及温度等吸附条件,探讨了吸附动力学和热力学。结果表明：当吸附剂的量为4 g/L,pH值为4,振荡时间1 h时,Mg/CTS/FA对弱酸性深蓝5R（Weak acid dark blue 5R,WADB 5R）的去除率达到91.77%,相应吸附量为504.73 mg/g（25℃）。Mg/CTS/FA对WADB 5R在不同温度下的吸附动力学能用拟二级吸附速率方程描述。该吸附能用Langmuir等温模型描述,同时也较好地符合D-R方程,由D-R方程所得E值、由Arrhenius方程得Ea值、动力学及热力学研究均表明该吸附是由化学和物理吸附及氢键共同控制。焓变ΔH值和ΔG值的结果表明该吸附是一个自发的放热过程。

英文摘要：

Mg/CTS/FA composite adsorbent was prepared by loading chitosan and magnesium ion onto fly ash. The effect of various operational parameters including solution pH, amount of adsorbent, oscillation frequency, contact time and temperature were investigated. The adsorption kinetics and thermodynamics were discussed. The results indicated that the removal rate and adsorption capacity of WADB 5R on Mg/CTS/FA could achieve 91.77% and 504.73 mg/g under the conditions of Mg/CTS/ FA dosage 4 g/L, adsorption temperature 25 ℃, solution pH of 4 and contact time of 60 min. The adsorption process was well described by pseudo -second -order model. The adsorption process fits well with Langmuir isotherm equation and Dubinin- Radushkevich（D-R）isotherm models. The values of E（D-R）, values of Ea and thermodynamic study show that the adsorption may be completed through chemisorption, physical adsorption and hydrogen bonding. Values of adsorption gibbs free energy changes （△G） and adsorption enthalpy changes （△H） show that the adsorption process of WADB 5R is spontaneous and exothermic nature.