壳聚糖改性污泥活性炭的脱硫脱硝性能  

Desulfurization and denitrification properties of activated carbon from sewage sludge modified by chitosan

作　　者：范晓丹[1,2] 张襄楷[1,3] 徐廷献[3] 

机构地区：[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 [3]天津大学材料学院,天津300072

出　　处：《环境科学学报》2012年第7期1750-1756,共7页Acta Scientiae Circumstantiae

基　　金：天津市应用基础及前沿技术研究计划~~

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168.76m·2g-1、0.084cm·3g-1及0.041cm·3g-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.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 .

关 键 词：污泥活性炭 壳聚糖 脱硫 脱硝 

分 类 号：X701[环境科学与工程—环境工程]