Al-Mn-pillared montmorillonite(AMPM) was prepared by using the artificial Na-montmoril-lonite from the Qingfengshan bentonite mine as starting materials mixed with Al-Mn pillaring solutions at different Al/Mn molar ra...Al-Mn-pillared montmorillonite(AMPM) was prepared by using the artificial Na-montmoril-lonite from the Qingfengshan bentonite mine as starting materials mixed with Al-Mn pillaring solutions at different Al/Mn molar ratios (R). The basal spacing and specific surface area of the materials were increased significantly compared with untreated clays. When R = 0.5, the d (001) value and specific surface area of pillared montmoril-lonite were 1.8987 ran and 146.01 m2 g-1, respectively. The thermal stability was determined using calcined tests , X-ray diffraction ( XRD ) analysis, thermal gravimetry and differential thermal analysis (TG - DTA). The materials formed at initial R = 0.5 exhibited a high stability, the basal interlayer spacing was stabilized at 1.7859 nm after calcined for 2 h at 300℃. The adsorption behavior of the materials was studied by adsorption experiments. The results show the AMPM and calcined Al-Mn-pillared montmorillonite ( CAMPM) exhibit a strong capacity of adsorbing the Zn(Ⅱ) in aqueous solution at pH 10.0.展开更多
Exchange enthalpies of aluminum with Na-montmorillonite suspension are determined at 3O3.15K and PH=3, and 4, using titration calorimetry and the exchange reaction mechanism are further studied by combining calorimetr...Exchange enthalpies of aluminum with Na-montmorillonite suspension are determined at 3O3.15K and PH=3, and 4, using titration calorimetry and the exchange reaction mechanism are further studied by combining calorimetric results and exchange isotherm determined by static method. The adsorption of aluminum on Na-montmorillonite is endothermic, and therefore exchange reaction is a process driven by entropy. X-ray diffraction patterns of montmorillonite saturated by Na+ and Al3+ are determined at wet and dry state respectively. The reslllts show Al3+ adsorbed on the clay can dramatically reduce the expansion of montmorillonite because Al3+prevents osmotic swelling.展开更多
基金Supported by Foundation for University Key Teacher by the Ministry of Education
文摘Al-Mn-pillared montmorillonite(AMPM) was prepared by using the artificial Na-montmoril-lonite from the Qingfengshan bentonite mine as starting materials mixed with Al-Mn pillaring solutions at different Al/Mn molar ratios (R). The basal spacing and specific surface area of the materials were increased significantly compared with untreated clays. When R = 0.5, the d (001) value and specific surface area of pillared montmoril-lonite were 1.8987 ran and 146.01 m2 g-1, respectively. The thermal stability was determined using calcined tests , X-ray diffraction ( XRD ) analysis, thermal gravimetry and differential thermal analysis (TG - DTA). The materials formed at initial R = 0.5 exhibited a high stability, the basal interlayer spacing was stabilized at 1.7859 nm after calcined for 2 h at 300℃. The adsorption behavior of the materials was studied by adsorption experiments. The results show the AMPM and calcined Al-Mn-pillared montmorillonite ( CAMPM) exhibit a strong capacity of adsorbing the Zn(Ⅱ) in aqueous solution at pH 10.0.
文摘Exchange enthalpies of aluminum with Na-montmorillonite suspension are determined at 3O3.15K and PH=3, and 4, using titration calorimetry and the exchange reaction mechanism are further studied by combining calorimetric results and exchange isotherm determined by static method. The adsorption of aluminum on Na-montmorillonite is endothermic, and therefore exchange reaction is a process driven by entropy. X-ray diffraction patterns of montmorillonite saturated by Na+ and Al3+ are determined at wet and dry state respectively. The reslllts show Al3+ adsorbed on the clay can dramatically reduce the expansion of montmorillonite because Al3+prevents osmotic swelling.
