改性柿子废渣对重金属Pb~(2+)和Cd~(2+)的吸附性能研究

以实验室酿酒后得到的柿子废渣为原料,利用其主要成分纤维素和单宁制备生物吸附剂,并通过对生物吸附剂进行化学改性增加其吸附效率,对溶液中重金属Pb~(2+)和Cd~(2+)进行吸附行为研究。结果表明:烘干的柿子废渣对重金属中Pb~(2+)和Cd~(2+)存在吸附作用,并对其进行吸附等温线研究,得到吸附剂对Pb~(2+)与Cd~(2+)的饱和吸附容量为46.08和25.00mg/g,而经NaOH改性后的柿子废渣附剂对Pb~(2+)与Cd~(2+)的饱和吸附容量为106.75和46.54mg/g,改性后吸附容量约是改性前吸附容量的2倍多,说明改性后效果显著。研究表明,经改性后的生物吸附剂成本较低、绿色环保,具有很大的潜在开发价值,并实现废渣的二次利用,为柿子产品的综合开发利用提供了新的途径。

Adsorption of Pb2+ and Cd2+ ions by chemically modified persimmon residue

There are a lot of tannin and cellulose in the residue of the persimmon wine,and they can be used as adsorbent for heavy metal.The adsorption efficiency of the adsorbent can be increased by chemical modification.In this study,the adsorption behavior to heavy metals Pb2+ and Cd2+ on the modified and unmodified persimmon pomace was analyzed.The results showed that the residue of dried persimmon adsorbed Pb2+ and Cd2+ effectively.The adsorption capacities of Pb2+ and Cd2+ were 46.08 mg/g and 25.00 mg/g,respectively.And the adsorption capacities of Pb2+ and Cd2+ were 106.75 mg/g and 46.54 mg/g after modification by sodium hydroxide,respectively.The adsorption capacity of modified persimmon was more than 2 times of that before modification.The results showed that the modified biosorbent has lower cost and is environmentally friendly which has great potential value of.development.It has realized the secondary utilization of waste residue,which provides a new way for comprehensive development and utilization of persimmon products.