摘要
用十六烷基三甲基季铵盐(HDTMA)和乙硫醇铵盐(AET)双阳离子同时复合改性内蒙钙基膨润土(NMB),制得新型吸附材料HDTMA-AET-NMB.利用X射线衍射(XRD)、热分析(TG-DTA)、红外光谱(FT-IR)及N2-BET等测定发现,复合改性膨润土的表面性质和层间结构已发生显著改变.对重金属离子Cd2+和对硝基苯酚(PNP)的吸附研究表明,HDTMA-AET-NMB能协同吸附混合水溶液中的目标污染物,对水中重金属离子的吸附机理是膨润土层间的AET与被吸附的Cd2+形成了稳定的配合物;对水中对硝基苯酚的吸附源于其在长碳链疏水介质中的分配.复合改性膨润土可望应用于重金属-有机物混合废水的处理.
A novel type of adsorptive material,HDTMA-AET-NMB,was prepared by modifying bentonite with both hexadecyltrimethylammonium bromide （HDTMAB） and β-aminoethanethiol hydrochloride （AET）. The modified bentonite was characterized by X-ray diffraction （XRD）,thermoanalysis （TG-DTA）,Fourier transform infrared spectroscopy （FT-IR）,and N2-BET measurement. The results indicated that the surface property and structure of HDTMA-AET-NMB were altered significantly from the original bentonite. The performance of this sorbent was studied and HDTMA-AET-NMB could sorb p-nitrophenol （PNP） and Cd2＋ simultaneously from the mixed solution. Cadmium adsorption was dominated by the formation of complexes between Cd2＋ and AET in the interlayer of the modified bentonite,while p-nitrophenol sorption was controlled by a partition process into the derived organic medium created by the long-chain alkyls of HDTMA. Because of its hybrid properties,the modified bentonite has potential application in treating wastewaters containing both heavy metals and toxic organic compounds.
出处
《环境科学学报》
CAS
CSCD
北大核心
2010年第5期1037-1042,共6页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No. 50378081)
浙江省自然科学基金(No. Y504041)~~
关键词
膨润土
吸附
有机污染物
重金属
配合物
分配
bentonite
sorption
organic pollutant
heavy metal
complex
partition
