• 关键词：污泥活性炭  壳聚糖  脱硫  脱硝

• 基金项目：天津市应用基础及前沿技术研究计划

• 范晓丹
• 1. 天津城市建设学院 环境与市政工程学院,天津 300384;
  2. 天津市水质科学与技术重点实验室,天津 300384

• 张襄楷
• 天津城市建设学院 环境与市政工程学院,天津 300384;
  2. 天津大学材料学院,天津 300072

• 徐廷献
• 天津大学材料学院,天津 300072

• 摘要：用壳聚糖改性污泥活性炭,测试分析了改性污泥活性炭的脱硫脱硝性能.同时,用N₂吸脱附法、电子扫描电镜、傅立叶变换红外光谱及X衍射等技术对改性污泥活性炭进行了表征,研究了改性条件对污泥活性炭脱硫脱硝性能的影响,探讨壳聚糖改性提高污泥活性炭脱硫脱硝性能的机理.结果表明,壳聚糖颗粒物能够较为均匀地分布于污泥活性炭的表面,壳聚糖与污泥活性炭结合良好,孔径也明显减小.壳聚糖与污泥活性炭是通过化学键结合的.改性时间与改性温度均可改变污泥活性炭的BET比表面积和孔容,但改性温度对BET比表面积和孔容的影响更为显著.具有最优孔结构的样品A3的BET比表面积、总孔容及中孔容分别为168.76 m²·g^-1、0.084 cm³·g^-1及0.041 cm³·g^-1.与污泥活性炭相比,改性污泥活性炭的脱硫脱硝性能优于污泥活性炭,这是由于壳聚糖中含氮与含氧官能团,丰富了污泥活性炭表面脱硫脱硝活性基团的种类与数量,利于SO₂与NO的吸附氧化;通过适当控制改性条件,也可显著地增加BET比表面积和中孔容,以提高SO₂与NO气体的物理吸附,从而提高其脱硫脱硝性能.

• Abstract：The activated carbon from sewage sludge (ACS) was modified with the chitosan (CS). The desulfurization and denitrification properties of the modified ACS with CS (referred as CS/ACS) were investigated experimentally. The structure and the surface groups of produced CS/ACS were analyzed by BET surface area measurement, scanning electron microscopy (SEM), x-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The effects of modification conditions on the desulfurization and denitrification properties of CS/ACS were investigated to explain the mechanism for SO₂ and NO removal. The results indicated that the pore diameters of CS/ACS were smaller compared with ACS. The binding between ACS and CS in the CS/ACS was good by the chemical bond. Both the modification temperature and the time were able to change the BET surface areas and pore volume of the CS/ACS, with the effect of temperature more significantly. The BET surface area, total pore volume and mesopore volume of the optimum pore structure of A3 were 168.76 m²·g^-1, 0.084 cm³·g^-1 and 0.041 cm³·g^-1, respectively. Compared with the ACS, the desulfurization and denitrification properties of the CS/ACS were greatly improved. This was because of the nitrogen and oxygen containing functional groups of —NH₂ and —O which were formed on the surfaces of ACS and increased the amount and types of the functional groups for the chemical adsorption of SO₂ and NO. The physical adsorption was also improved by controlling modification conditions to obtain optimum BET surface area and mesopore volume, upgrading the desulfurization and denitrification properties

• Key words：activated carbon from sewage sludge  chitosan  desulfurization  denitrificati

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