Advanced Materials Research Vol. 826

Abstract: Admix different tailings for preparing new inorganic mineral polymer. To explore the preparation conditions by testing the different performances of mortar specimens. The results show that, the strength performance is the best when the tailing dosage is 20%, the modulus of water glass is 1.2, water glass content (Na2O) is 4.5% and the ratio of liquid to solid is 0.6.

Abstract: Directly modified bentonite was obtained by directly adding modifier cetyl trimethyl ammonium bromide (CTMAB) to sodium bentonite.The modified bentonites adsorption performance to methyl orange and methylene blue was studied, and it was compared with modified bentonite prepared by classical method. The results show that directly modified bentonite has a greater and faster absorption for both methyl orange and methylene blue; the relationship between adsorption quantity and equilibrium concentration conforms to the Langmuir isotherm equation; absorption kinetics is in accordance with the secondary dynamics equation.

Abstract: A new method of preconcentration with nanometer-strontium titanate immobilized on aluminum oxide (ASTO) combined with flame atomic absorption spectrometry (FAAS) was proposed for the determination of trace heavy metal ions, included Cu²⁺, Ni²⁺ and Ag⁺, in environmental water. The optimum experimental parameters for preconcentration of the heavy metals studied, such as pH, shaking time, eluent and coexisting ions, have been investigated. The results showed that Cu²⁺, Ni²⁺ and Ag⁺, could be quantitatively retained by the ASTO in the pH range of 5-8, and then eluted completely with 2 mol·L^-1 HNO₃. The detection limits of this method for Cu²⁺, Ni²⁺ and Ag⁺ were 0.031μg·L^-1, 0.15μg·L^-1and0.041μg·L^-1 with an enrichment factor of 50, respectively. The method has been applied to the simultaneous determination of trace amounts of Cu²⁺, Ni²⁺ and Ag⁺ in environmental water, the recoveries were all in 95%-105%.

Abstract: In this paper, a manual-controlled injection nanometer calcium titanate based on glass fiber filter enricher (MICTE) was prepared, and its application in speciation of Cr (III) and Cr (VI) was studied. The optimum experimental parameters for separation of the Cr (III) and Cr (VI) have been investigated. The results showed that the MICTE had adsorption capacity towards the Cr (III) and Cr (VI). And two forms of chromium show different adsorption capacities at different pH values, Cr (III) could be adsorbed at pH 9, but Cr (VI) cant be adsorbed. Whereas Cr (VI) retained at pH 3, but Cr (III) cant be adsorbed. Therefore, it is possible that the two forms of chromium are complete separated. The Cr (III) and Cr (VI) could be completely eluted with 1 mol·L¹ HCl and 1 mol·L¹NaOH, respectively. The chromium concentration was measured by atomic absorption spectroscopy. A new method for determination of the speciation of chromium in environmental water samples based on the manual-controlled injection enricher and atomic absorption spectroscopy determination was proposed. The method was successfully applied for the determination of Cr (III) and Cr (VI) in environmental waters with satisfactory results.

Abstract: The adsorption performance of Plumbum ion from aqueous solution by furfural residue was studied. The results show that the adsorption of Plunbum on furfural residue reached equilibration by 60 minutes. The removal efficiency of Plumbum ion in aqueous solution on furfural residue of Plumbum ion achieved the 92.89% in 50mL 200mg.L-1 Plumbum ion aqueous solution with adding 4g/L furfural residue. The temperature had an effect on the removing of the Plumbum ion on furfural residue, and the adsorption of furfural residue to Plumbum ion was decalescence reaction. The relationship between adsorbing capacity (qe) and equilibrium mass concentration (ρe) is in accordance with the isothermal adsorption equations of Freundlich and Langmuir.

Abstract: There are a lot of white ore in Jixi Qingshan coal mine. Argillization of this ore is very terrible. This ore quickly turns to fine white slime in water and forms the stable suspending liquid. It leads that slime water form sediment is very terrible. This paper analyzed and researched the characters of the fine white slime water. The experiment results showed that the combined applied effect of MgCl₂ and NPAM can enhance form sediment effect. The sample is the coal sample used in Jixi Qing Shan coal mine, which contains lots of white ore and is dipped in water for observation. This ore quickly turns to fine white slime in water, superfine, forming the stable suspending liquid. This suspending liquid become sedimentation in the natural placement for several days, which seriously effect the normal operation of the system of the manufacturing part of coal cleaning. This research on the sedimentation experiment of the fine white slime water will be introduced in this thesis.