改性糠醛渣基活性炭对水中Hg2+吸附性能的研究

摘要

Activated carbon prepared from furfural residue. Then the modification was carried out using sulfur dichloride reflux boiling and microwave roasting. The differences of surface functional groups before and after modification were analyzed through Boehm titration, pore size distribution and Fourier transform infrared spectroscopy (FT-IR). The results of Boehm titration showed that total acidity and the number of carboxyl and lactone increased after modification. The new peaks between 700 - 500 cm' in FT-IR spectra indicated that S-S, C-S bonds appeared on the surface of modified activated carbon. Pore size distribution showed that the microporous of activated carbon were developed after modification. This paper also studied the adsorption capacity of Hg2+ ion by modified activated carbon under different conditions such as varied concentrations, adsorption time and pH value. The final results showed that under the condition of Hg2+ 1-6 mg/L, adsorption time 180 min, and pH value 6-7, 25℃, S2C12 modified activated carbon(2.5 g carbon, 1 L solution), the removal rate of Hg was more than 93 %.%对糠醛渣制得的活性炭,采用S2Cl2回流负载,再微波焙烧的方法进行改性,采用Boehm滴定法和FT-IR分析了活性炭改性前后表面官能团的变化情况；对比了活性炭改性前后孔径分布情况；并探讨了改性活性炭对水体中的Hg2+吸附性能.Boehm滴定分析表明活性炭改性后的总酸度、羧基、内酯基皆有增加；FT-IR谱图上700～500 cm-1范围内出现了新的吸收峰说明了改性活性炭表面增加了C—S、S—S键,孔径分布分析表明改性后活性炭微孔更加发达.在Hg2+初始质量浓度1～6 mg/L、温度25℃、pH值6.0～7.0、吸附时间180 min的条件下,经S2Cl2改性后活性炭用量为2.5 g/L时,对水体中Hg2+去除率达93％以上.