Preparation Of Functional Nano-material And Study On Its Adsorption Capability

(1) The characteristic and preparation of nano-material had been introduced in the paper.And the definition of adsorption, the types of adsorption,the adsorption isotherm and the inside and outside reaching trend of nano-material also had been discussed.(2) Under certain conditions,Self-assembly MnO₂ had been successfully prepared by reaction between HMnO₄ and MnSO₄ using 7% polyethylene glycol(1000)(PEG) as dispersant in the research.The production was characterized by X-ray diffraction and transmission electron microscopy.The results indicated that the self-assembly MnO₂ were spherical and hollow polymers,with the diameter of 300-600nm,and separated comparatively symmetrically.The factors of influence adsorption had been investigated including adsorption time,the initial concentration of alizarin red,temperature,sorbent dosage and initial pH.The pseudo-second-order kinetic law of Langergren model was very suitably used to describe the adsorption behavior of alizarin red and the adsorption rate constant was also calculated in the paper.The adsorption isotherm had been modeled by Freudlich equation and the process of adsorption matches Freudlich model,and the interrelated constants were calculated as . The maximum amount of adsorption nearly reached in 60 minutes.The decolorization rate of alizarin red could be up to 86% in the best conditions.The decolorization efficiency can be kept over 80% after the adsorbent was regenerated for 4 times.It was suited for using in disposing dye waste water.(3) Titania-coated polymeric nanopartical were synthesized based on the cationic particles which were prepared by surfactant-free emulsion copolymerization of styrene and butylacrylate in the presence of a cationic monomer , methacryloxyerhyltrimethyl ammonium chloride(MOTAC) using azobis(isobutylamidine) hydrochloride(AIBA) as aninitator . These cationic particles were stabilized by poly(vinyplpyrrolidone) hydrolyzed onto the cationic surfaces of colloidal particles.Subsequently,the samples were heated to 500℃to form anatase TiO₂ and to remove the colloidal template,which resulted in hollow nanospheres.The hollow titania particles were characterized with scanning electron microsopy,X-ray diffraction.The results indicated that the self-assembly TiO₂ were spherical and hollow polymers,with the diameter of 100nm,and separated comparatively symmetrically . The factors of influence adsorption had been investigated including photocatalytic time,the initial concentration of alizarin red-methyl orange and sorbent dosage.The decolorization rate of alizarin red could be up to 80% in the best conditions.The decolorization efficiency can be kept over 78% after the adsorbent was regenerated for 2 times.It was suited for using in disposing dye waste water.(4) In our present work,we have designed a series of mesoporous titanium oxides doped with manganese oxide through a"stepwise hydrolyze"method with a"coating mechanism".Mesoporous structured TiO₂/MnO₂ nano-composite material have been synthesized through a modified sol-gel method.Manganese acetate tetrahydrate,exhibiting good solubility in ethanol solution,was employed as the doping reagent to ensure homogeneous dispersion.Then,prepared TiO₂ mixed with a calculated amount of ethanol , was added to manganese acetate tetrahydrate(Mn(CH3COO)2·4H2O,MW=245.09).The final obtained solution had a bright yellow color,then,a calculated amount of ethanol was added to the above solution ,changing it into a sol.Subsequently,the samples were heated to 500℃to form anatase TiO₂/MnO₂.Finally,particle size and distribution were determined by scanning electron microscopy(SEM) and X-ray diffractometer(XRD) measurements.It was suited for using in disposing dye waste water.The results indicated that the TiO₂/MnO₂ were hollow polymers , with the diameter of 100-200nm,and separated comparatively symmetrically.The factors of influence adsorption had been investigated including adsorption time,the initial concentration of alizarin red-methyl orange,sorbent dosage and initial pH.The decolorization rate of alizarin red could be up to 95% in the best conditions.The decolorization efficiency can be kept over 90% after the adsorbent was regenerated for 4 times.It was suited for using in disposing dye waste water.