Study on the Adsorption Behavior of Co(II), Pb(II) on Modified Sodium Trititanate Whisker and Its Application to Wastewater
The modification of sodium trititanate whisker surface was performed by means of impregnation procedure to fabricate the modified sodium trititanate whisker, which was characterized by scanning electron microscopy(SEM) and infrared spectroscopy(IR). Its adsorptive performance for Co(II), Pb(II) in a static system was investigated by inductively coupled plasma atomic emission spectrometry(ICP-AES). The main factors affecting adsorption and desorption of Co(II), Pb(II), the adsorptive capacity of Co(II), Pb(II) in optimal condition and adsorption isotherm and the influence of coexistent ions were examined. The comparative test for selectivity was done. The adsorptive rate for Co(II) and Pb(II) on 0.2500 g of modified sodium trititanate whisker at PH 5.0 was the best. Co(II), Pb(II) adsorbed on the modified sodium tretitanate whisker could be eluted with 10 mL of 3.0 mol/L HCl. The adsorptive performance of modified sodium trititanate whisker was better than that of unmodified sodium trititanate whisker. The sobent has been applied to the enrichment and separation of Co(II), Pb(II) in water sample to determine Co(II), Pb(II).
Progress on detection and analysis method of environmental endocrine disruptors
In this paper,the advances on detection and analysis methods of environmental endocrine disruptors were reviewed,which included the categories,pretreatment technique in different matrices and detection method etc,and the future′s prospects on the study of detection and analysis method were talked about also.
Synthesis and photochemical properties of Cu2+ doped layered hydrogen titanate
Abstract Cu2+ doped layered hydrogen titanate was prepared by the calcination of K2CO3, TiO2 and CuO mixtures with the K2CO3:TiO2:CuO molar ratio of 1:2.5(1−x):2.5x at 1200°C for 5 h followed by an ion-exchange reaction in 1 M HCl solution. The crystalline phase changed from monoclinic hydrogen tetratitanate to an orthorhombic lepidocrocite-type hydrogen titanate by increasing the amount of Cu2+ doped. Both compounds could be excited by visible light irradiation (λ>400 nm) and were capable of hydrogen gas evolution from an aqueous methanol solution, where the photocatalytic activity of Cu2+ doped hydrogen tetratitanate was slightly greater than that of Cu2+ doped lepidocrocite-type hydrogen titanate. The photocatalytic activity of Cu2+ doped hydrogen tetratitanate was enhanced by constructing Pt and TiO2 pillars in the interlayer, and the incorporation of Pt in Cu2+ doped hydrogen tetratitanate enabled the cleavage of water into hydrogen and oxygen by irradiating visible light (λ>400 nm) without a sacrificial hole acceptor.