Na2S·HNO3改性活性炭对水中低浓度Pb2+吸附性能的研究
Research on adsorbing low concentration Pb2+ in water by Na2S·HNO3 modified activated carbon
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摘要: 采用回流蒸煮、微波焙烧的方法改性活性炭，通过Boehm滴定法、TG和FT-IR分析了改性前后活性炭表面官能团的变化情况。Boehm滴定表明：改性活性炭的总酸度、羧基、内酯基皆有增加；TG曲线中的多个失重峰说明了改性活性炭表面含氧基团的增加；FT-IR谱图上500～720 cm-1范围内新峰的出现说明了改性活性炭表面增加了S—S、C—S键。研究结果表明：在Pb2+浓度1 mg/L、吸附时间2 h、温度20℃和pH=6条件下，5%Na2S·（1+9）HNO3改性活性炭用量为4 g/L时对Pb2+去除率达94.46%。Abstract: Activated carbon was modified using reflux boiling and microwave roasting. The changes of surface functional groups between activated carbon both before and after modification were analysed by Boehm titration, thermogravimetry(TG) and Fourier transform infrared spectroscopy(FT-IR). The result of Boehm titration showed that the total acidity and the number of carboxyl and lactones increased after modification. A number of weight loss peaks in TG curves illustrated the increase of oxygen groups on the surface of modified activated carbon. The new peaks among 500～720 cm-1 in FT-IR spectra indicated the appearance of S—S, C—S bonds on the surface of modified activated carbon. The final result showed that under the condition of Pb2+ 1 mg/L, adsorption time 2 h, 20℃and pH=6, 5%Na2S·（1+9）HNO3 modified activated carbon(4 g carbon, 1 L solution), the removal rate of Pb2+ could reach 94.46%.
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Key words:
- modified activated carbon /
- lead ions /
- adsorption /
- reactive groups
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