蚕茧对六价铬的吸附性能

Adsorption capacity of cocoon to Cr(Ⅵ)

为了解蚕茧对铬的吸附能力,用蚕茧壳、洗涤后的蚕茧壳、改性茧壳吸附模拟废水中的铬,用吸附率和单位吸附量检测吸附效果。结果表明:直接用茧壳吸附铬的效果差,洗涤茧壳较直接用蚕茧壳吸附铬的效果好;尿素改性茧壳较洗涤茧壳的吸附效果差,柠檬酸改性茧壳的吸附效果比洗涤茧壳略好;洗涤茧壳在50℃、p H=1、浴比1∶50、铬液质量浓度60μg/m L、吸附时间40 min时,其吸附率为73.79%,单位吸附量为2.2 mg/g;柠檬酸改性茧壳在30℃、p H=1、浴比1∶50、铬液质量浓度40μg/m L、吸附时间120 min时,其吸附率为81.29%,单位吸附量为1.63 mg/g。

In order to understand adsorption capacity of cocoon to chromium in wastewater,cocoon shell,washed cocoon shell and citric acid modified cocoon shell were used to adsorb chromium in simulated wastewater,and the adsorption effect was tested with adsorption rate and unit adsorption capacity. The results show that the effects of absorbing chromium using untreated cocoon shell is poor,and that using washed cocoon shell is better; and the effects of absorbing chromium using urea modified cocoon shell is inferior that using washed cocoon shell,and the effects of absorbing chromium using citric acid modified cocoon shell is slightly better that using washed cocoon shell. Under the conditions of temperature of 50 ℃,p H of 1,bath ratio of 1∶ 50,chromium concentration of 60 μg / m L and adsorption time of 40 min,the adsorption rate of washed cocoon shell was of 73. 79%,and the unit adsorption capacity thereof was 2. 2 mg / g. Under the conditions of temperature of 30 ℃,p H of 1,bath ratio of1∶ 50,chromium concentration of 40 μg / m L and adsorption time of 120 min,the adsorption rate of citric acid modified cocoon shell was of 81. 29%,and the unit adsorption capacity was 1. 63 mg / g.