环境化学
孙洪良,朱利中.十六烷基三甲基季铵盐-乙硫醇铵盐复合改性膨润土吸附性能研究[J].环境科学学报,2010,30(5):1037-1042
十六烷基三甲基季铵盐-乙硫醇铵盐复合改性膨润土吸附性能研究
- The performance of the HDTMA-AET modified bentonite as a sorbent for Cd and p-nitrophenol
- 基金项目：国家自然科学基金(No.50378081);浙江省自然科学基金(No.Y504041)
- 作者
- 单位
- 孙洪良
- 浙江工商大学化学系, 杭州 310012
- 朱利中
- 浙江大学环境科学系, 杭州 310028
- 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.
- Abstract：Anovel 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-BETmeasurement. The results indicated that the surface property and structure of HDTMA-AET-NMBwere altered significantly from the original bentonite. The performance of this sorbent was studied and HDTMA-AET-NMBcould sorb p-nitrophenol (PNP) and Cd2+ simultaneously from the mixed solution. Cadmium adsorption was dominated by the formation of complexes between Cd2+ and AETin 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.
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