固化杨梅单宁对水体环境中铁离子的吸附特性研究

Adsorption Property of Iron Ion in Aqueous Solution by Immobilized Bayberry Tannins

以天然生物质杨梅单宁为原料,通过甲醛交联,制得固化杨梅单宁吸附材料,研究了其对水环境中Fe(Ⅱ)的吸附特性.实验表明:该吸附材料对Fe(Ⅱ)有较强的吸附能力,且吸附平衡量主要受p H影响.p H 4.0,温度286 K时,仅需1 h,平衡吸附量可达106.32 mg·g^(-1).该吸附材料对Fe(Ⅱ)的吸附平衡符合Langmuir方程.吸附动力学可用准二级速率方程来描述,且优于准一级速率方程和Elovich方程.循环使用3次,吸附量为81.6 mg·g^(-1),重复使用性好.该吸附材料原料来源广泛,制备工艺简单,对水体中Fe(Ⅱ)具有较好的吸附能力,可以得到较广阔的应用.

A novel sorbent is prepared by using a natural biomass,bayberry,as raw materials via cross-linking reaction with formaldehyde. The adsorption performance of the sorbent to Fe（ Ⅱ） in aqueous solution is investigated. Results show that the adsorption capacity of the sorbent to Fe（ Ⅱ） is mainly affected by p H value of solution. The equilibrium adsorption capacity can be reached within 1h,with a value of 106. 32 mg·g-1（ p H 4. 0,286 K）. The adsorption isotherm can be described by the Langmuir equation. The adsorption kinetics data are well fitted by the pseudo-second-order rate model compared to the pseudo-first-order rate model and the Elovich model. The adsorption capacity of this sorbent is 81. 6 mg·g-1when use for 3 times. The source of the raw material is rich,and the preparation process is facile. In addition,it can be widely used due to its excellent performance on adsorptive removal of Fe（ Ⅱ）from aquatic environments.