Advanced Materials Research Vols. 781-784

Abstract: Indole and its derivatives extensively exist in nature, which showed a wide range of biological activities. Recently, there is a growing tendency to develop some new methods for the synthesis of novel indole derivatives and to study their biological properties. In this paper, we would like to report the design, synthesis and biological evaluation of a novel series of tricyclic indoles by employing Pictet-Spengler reaction as key step. All the target compounds were synthesized in four steps in 68-78% overall yield, which were characterized by ¹H-NMR spectrum. All this new compounds were tested in an MTT assay on HepG2 and K562 and HT-29. Two of them showed tumor cell growth inhibitory good activity.

Abstract: Static adsorption experiments were conducted to understand the impact of soil surface charge characteristics, such as pH, AEC and CECp values, on migration behavior of radioactive Uranium, Strontium and Cesium. The results demonstrate that distribution coefficient of Uranium (U-Kd value) increases with decreasing initial pH of solution, and increases with increasing AEC values for acidic clay and silty clay that were studied; distribution coefficients of Strontium and Cesium appear to be positively correlated with CECp values of and total contents of montomorillonite and illite in the soil.

Abstract: A SPE-GC-FID method was developed for the analyzing the residues of prometryne and acetochlor in soil-water system. The sample solution was made up of the standard stock solution of prometryne-acetochlor and soil-water solution with a certain proportion.purified by C₁₈ solid-phase extraction (SPE) column, and then leached by acetone. The leached was filtrated with microporous membrane (d<0.45 μm). The results showed that the standard curve was showed in the range of 1.5~30 μg/mL with a correlation coefficient of 0.9995 and 0.9980. The recoveries (n=5) were 98.9%~107.2%, with relative standard deviation ranged from 2.52% to 9.7%.The detection limits of prometryne was 0.22 μg/mL and acetochlor was 0.19 μg/mL. This method provides a dependable approach to examine and evaluate the residues of prometryne and acetochlor in the soil-water system.

Abstract: Sodium ferrate solution was obtained with microwave method using Fe₃O₄ as iron source. The product was characterized by ultraviolet-visible spectrum (UV-Vis). And the results indicated that the prepared product was sodium ferrate, which has a maximum absorption at 505nm. The concentration of the product was affected by many reaction conditions, such as activation time, reaction time, and concentration of reactant. The optimum conditions was determined through a series experiment, at which the concentration of sodium ferrate was 1.41g/L.

Abstract: The amine aldehydes resin-mesoporous materials complex AFC-SBA-15 was synthesized using ordered mesoporous materials SBA-15 as the carrier. The obtained compound was characterized by FT-IR,N₂ adsorption-desorption and scanning electron microscopy. The compound retained ordered mesoporous structure and the resin polymer coated inside channels and outside surface hole wall. The adsorption behavior was carried out with the presence of EDTA in binary components of Pb (II) and Zn (II). The result showed that with the presence of EDTA, tunable selectivity could be realized.

Abstract: In this work attapulgite and chitosan were employed to prepare composites as eco-friendly adsorbent. Study on the adsorption efficiency of the adsorbent for Cr (VI) in aqueous solution was carried out. External factors such as the amount of attapulgite in the composites, initial concentration of Cr (VI), adsorption time and adsorbent dosage how to influence the adsorption efficiency of composites were investigated. The results showed that 0.63g adsorbent can reach maximum adsorption rate, which the mass ratio of attapulgite and chitosan is 0.8:1, the initial concentration of copper ions is 100mg / L and absorption time is 30min. Isotherm data fitted well to the Langmuir isotherm model.

Abstract: The photocatalytic N-S co-doped TiO₂ films coated on glass fibers were successfully prepared by sol-gel, dip-coating and calcination methods. The effect of doping concentration on crystalline size, microstructure, morphology, optical property and photocatalytic activity was investigated. The films were characterized by XRD, SEM, EDS, UV-vis DRS and FT-IR. The photocatalytic activity was evaluated by the degradation of methylene blue (MB). N-S co-doping has an effect on light adsorption wavelength shifted to visible light region which can lower the band gap energy of N-S co-doped due to the replacement of O atom in TiO₂ by N and S atoms to form Ti-O-N and Ti-O-S structures. Thiourea, a source of nitrogen and sulfur could increase viscosity of sol used for coating on glass fibers, resulting in larger particles size and more surface roughness of the doped films.TiO₂ films with 5 mol% N-S co-doped showed an excellent photocatalytic performance under fluorescent light irradiation.

Abstract: The present study aimed at investigating the preparing nanotitania by sol-gel method and nanoFe-TiO₂ oxidation system for the treatment of oily wastewater. Reaction conditions were optimized concerning TiO₂ type, the dosage of Fe-TiO₂ and pH. The efficiency of oil removal and COD removal were ascertained and optimum process conditions for stable and effective operation were determined. Under the optimum conditions of Fe-TiO₂ 1 g/L and pH 6.0, the process of UV/Fe-TiO₂ achieved removal efficiencies of oil and COD as 98.1% and 98.5%, respectively. Thus, this technique could be used as a treatment for oily wastewater.

Abstract: Ultra-Violet (UV) photocatalytic degradation and anaerobic digestion (AD) were applied in the treatment of methylene blue (MB) dye. South African natural zeolite was used as a catalyst support and biomass support in the photocatalysis and AD process respectively. It was found that UV photocatalysis pre-treatment of MB dye before the AD process improved its biodegradability. This resulted in higher biogas production coefficient compared to the non-UV pre-treated MB dye.

Abstract: Titania dispersed on dealuminated Clinoptilotile (TiO₂/HCP) was synthesized and characterized by Scanning Electron Microscope (SEM). Supporting characterization techniques reveals partly dispersion of TiO₂ within the cavities of dealuminated Clinoptilotile (HCP) and TiO₂ exist as nanoparticles or clusters on the HCP surface ascribed to lower loading of TiO₂. The photocatalytic degradation of methyl orange solution was conducted under UV-irradiation in the presence of TiO₂/HCP. The photocatalytic degradation of methyl orange in the presence of the photocatalyst was optimized at lower loading of TiO₂, at a lower initial dye concentration (30 ppm), calcination temperature of 873K and nitrate ion accelerates degradation activities of methyl orange. Kinetic studies depict the photocatalytic degradation of methyl orange follows the pseudo-first order reaction.