改性壳聚糖吸附剂表征及脱除Hg^0的实验研究  

CHARACTERIZATION OF MODIFIED CHITOSAN SORBENTS AND THEIR PERFORMANCE FOR ELEMENTAL MERCURY REMOVAL

作　　者：张安超[1,2] 孙路石[1] 向军[1] 高鹏[3] 胡松[1] 徐朝芬[1] 付鹏[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074 [2]河南理工大学机械与动力工程学院,河南焦作454003 [3]华北电力大学能源与动力工程学院,河北保定071003

出　　处：《工程热物理学报》2010年第9期1607-1610,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50776037;No.50721005);国家高技术研究发展计划项目(No.2007AA05Z308);新世纪优秀人才支持计划资助项目(No.NCET-07-0335)

摘　　要：应用VM3000在线测汞仪作为检测手段,在固定床实验台架上,用碘、硫酸和盐酸改性壳聚糖为吸附剂进行脱汞(Hg^0)实验研究。采用傅里叶变换红外光谱(FTIR)和X射线衍射仪(XRD)对吸附剂进行性能表征。结果表明,碘化钾、硫酸(盐酸)和壳聚糖中的氨基发生了化学反应。质子化的壳聚糖更利于吸附碘这一对Hg^0有吸附力的活性位,壳聚糖吸附剂上碘等活性位的存在形态是其脱除汞的关键因素;单质碘改性壳聚糖吸附剂并不能有效地脱除Hg^0;KI和H_2SO_4改性壳聚糖吸附剂120 min内的汞容积量达200μg/g,其初始时刻的最大脱汞效率可达100%。Adsorption experiments of vapor-phase elemental mercury were carried out using iodine, diluted sulfuric acid and hydrochloric acid modified chitosan sorbents in a laboratory-scale fixed-bed reactor. VM3000 online mercury analyzer was applied to detect the inlet and outlet Hg0 concentrations. The characterizations of the sorbents were analyzed using Fourier transform infrared （FTIR） spectroscopy and X-ray diffraction （XRD） analysis instruments. The results showed that the chemical reactions of iodine and sulfuric acid （hydrochloric acid） with the amido of CTS occurred. The active site of iodine for mercury capture can be adsorbed easily by protonated chitosan. The species of the iodine in modified chitosan sorbents was the key effect on elemental mercury capture. Elemental iodine modified chitosan exhibited a poor performance on Hg0 removal. While the potassium iodide and sulfuric acid modified chitosan sorbents demonstrated higher mercury capture capacity of 200 μg/g, and its maximum efficiency at initial stage was 100%.

关 键 词：改性壳聚糖 碘 吸附剂 脱汞 

分 类 号：TQ534.19[化学工程—煤化学工程]