改性菌渣对含Pb^(2+)废水吸附性能的影响

Effects of the Modified Shiitake Residues on Adsorption Performance of Wastewater Containing Pb^(2+)

采用盐酸浸泡和热处理的方法对香菇菌渣改性后制备吸附剂,研究其对模拟废水中Pb^(2+)的吸附性能,考察了初始浓度、温度、pH、吸附剂投加量和吸附时间5个因素对吸附性能的影响,并研究了改性菌渣吸附剂对Pb^(2+)的等温吸附和吸附动力学特征。结果表明:改性菌渣对Pb^(2+)模拟溶液的最佳吸附条件为:pH=5.0、吸附剂投加量1.6 g/L、初始浓度250 mg/L、温度25℃、吸附时间60min。在该条件下对Pb^(2+)的吸附率可达95.68%,改性菌渣吸附Pb^(2+)的过程符合Langmuir等温模型和准二级吸附动力学模型,吸附速率主要由化学吸附控制。

A kind of adsorbent prepared from Shiitake residues using hydrochloric acid soaking and heat treatment was used to test its capability of removing Pb^2+ from wastewater. The influencing factors,such as initial concentration of Pb^2+,temperature,pH,dosage of the adsorbent and adsorption time were in vestigated. The isothermal adsorption and adsorption kinetics of the Shiitake residue adsorbent were also investigated. Results showed that the optimal conditions for the adsorption were as follows:pH was 5.0, dosage of the adsorbent was 1.6 g/L,initial Pb^2+ concentration of the wastewater was 250 mg/L,tempera ture was 25 ℃ and adsorption time was 60 min. Under the above circumstance,the removal ratio of Pb^2+ reached 95. 68 %. Its Pb^2+ adsorption kinetics tallied with the second-order reaction equation and its ad sorption isotherm could be described well with the Langmuir models. Its adsorption rate was mainly regu lated by Chemisorption.