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Hydrotalcite (HT) or hydrotalcite-like compounds (HTlc) are layered double hydroxides belonging to the class of anionic clays. The structure of these compounds are very similar to that of brucite, Mg(OH)2, where some of Mg2+ represented as [M(II)] are isomorphously replaced by Al3+ represented as [M(III)] and the net positive charge is compensated by the inter-layered exchangeable anion (An−).
In this study a comparison of structure, morphology and adsorption capacity between copper doped natural and synthetic zeolite is investigated. Synthetic zeolite A was synthesized from natural clinoptilolite as Si source and sodium aluminate as Al source. The comparative surface characterization of both copper doped natural and synthetic zeolites has been investigated by X-ray diffraction (XRD), scanning...
In this paper, the removal of aflatoxins B2 from water is studied and a new adsorbent Cu/PTMAB-MMT is prepared. The change of the microscopic structure of the absorbent before and after adsorption reaction is analyzed by TEM, XRD and EPR. The effect of temperature and PH on the adsorption are studied and also the best temperature and PH are determined.
Fe-doped titania nanotubes were prepared by impregnation method to improve the adsorption properties of titania nanotubes. XRD and BET were used to characterize the crystalline phase and special surface area of titania nanotubes. The analysis results revealed that the crystalline phase of titania nanotubes was unchanged after doping the iron, and the characteristic peak of iron appeared when the concentration...
Mn1Ce1 and Mn0.9Co0.1Ce1 complex oxides were prepared by co-precipitation in hydrothermal conditions and their physicochemical properties were characterized with N2 adsorption, XRD, Raman, and SEM. The complex oxides show enough stability and catalytic activity for oxidative degradation of 4,4'-Dibromobiphenyl in sub-critical water. Mn0.9Co0.1Ce1 has higher activity than Mn1Ce1, indicating doping...
To explore treatment of phenol wastewater, carbonate pillared Mg/Al hydrotalcites and four kinds of modified Mg/Al hydrotalcites with different concentration of SDBS were synthesized by coprecipitation method and characterized by XRD and FTIR respectively. Then the five kinds of Mg/Al hydrotalcites were used as adsorbent to adsorb phenol in solution, in the meantime the adsorption mechanism and influencing...
Hydroxyapatite (HAp) nanopowders were prepared by chemical precipitation method, and the powders were characterized by FETEM, XRD and ICP-AES technologies. The adsorption results of m-nitrophenol on HAp nanopowders in aqueous showed that the adsorption capacity increased with the increase of the phenol concentration and the temperatures. The adsorption process was in accorded with Freundlich and Langmuir...
In order to increase the absorption capacity of Zeolite of NH4+-N, clinoptilolite from Henan Gongyi was modified, and the modified zeolite concentration was 50 mg·L-1 imulated NH4+-N wastewater modified after the use of roasting by static test, microwave, acid, salt, and integrated heat, the result of experiments was that the Zeolite adsorption of Natural Zeolite and six modified zeolite adsorption...
The montmorillonite was modified by AlCl3 and was used to remove the fluorine in the drinking water. The factors of influencing the fluorine removal rate, including the concentration of AlCl3 and the mass of the adsorbent, was studied in the research. The fluorine removal percentage was 97% by 10 g/L modified montmorillonite in the 10 mg/L fluorine solution at pH7, 25+2°C. The results suggest that...
The adsorption of thiophene from thiophene-octane mixture has been investigated using organic-montmorillonite under proper conditions. The adsorbents were prepared by a xerogel process, followed by thermo - treatment. The adsorptive experiments show that C-P-MMT adsorbent has the higher capacity, 3.8mg/g (mg of sulfur per g of adsorbent). BET, XRD, NMR were used to characterize the adsorbents. It...
Based on the strong affinities of Fe(III) and Al(III) to fluoride, four iron- aluminum hydroxide complexes were synthesized as adsorbents for the fluoride removal. Moreover, the adsorption experiments showed that all iron-aluminum complexes could adsorb aqueous fluoride effectively and with a high capacity. When an fluoride solution of 10 mg/L−1 was added with anyone of these complexes at pH 5.0–9...
The influence of Fe in catalyst for low-temperature selective catalytic reduction of NO with NH3 was investigated via altering the loading of Fe. A series of catalysts were prepared by impregnation method. The results show that the loading of Fe could improve the catalytic performance of the catalyst at low temperature. The removal efficiency of NOx could exceed 95% at the range of 150~230°C with...
The adsorption of reactants over the commerciallized SCR catalyst surface was investigated by EPR, as well as the influence of H2O and SO2. The results showed that the V4+ over the catalyst could be oxidized under NO + O2 atmosphere, and NH3 was adsorbed on Brönsted acid sites. The amounts of V4+ and super oxide ions were promoted at the presence of H2O and SO2 after adsorption. However, the intensity...
The modified mesoporous silica with aminopropyl group (NH2-(CH2)3-MCM-41) and chloropropyl group (SH- (CH2)3-MCM-41) and pure mesoporous silica (MCM-41) have been synthesized via the microwave-assisted hydrothermal method. The samples were characterized by X ray diffraction, FT-IR spectroscopy and Nitrogen adsorption-desorption. Then adsorption test of copper ion was investigated. Langmuir model is...
Unsupported Ni-Mo composite oxide catalysts were successfully prepared by the sol-gel method with citric acid as a complex agent. The catalysts were characterized using N2 adsorption-desorption, X-ray diffraction (XRD) and temperature programmed desorption (NH3-TPD). The effects of Mo/Ni molar ratio and reaction temperature on the hydrodeoxygenation activity of the catalysts were investigated emphatically...
Synthesis of mesoporous TiO2 particles using ionic liquid (IL)-assisted sol-gel method was investigated. The product was analyzed and characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), and N2 adsorption and desorption. The products revealed higher photo catalytic activities than that of the commercially available TiO2, Degussa P25 in the photo degradation of methylene...
Adsorptive effects of natural clinoptilolite (NC), HDTMA-modified natural clinoptilolite (HMNC) and CPB-modified natural clinoptilolite (CMNC) were assessed for the removal of Cr(VI) from water using stirring method. Subsequently, the surface characteristics of this three materials were analyzed by XRD and IR. Selectivity series deduced from removal effect of Cr(VI) were CMNC > HMNC > NC, and...
In resent years, various types of iron-based materials have been used as sorbents to remove heavy metals from wastewater. It is reported that the adsorption capacities of heavy metals on different kinds of iron oxides are quite high. However, researchers have not done much work on the Cr (VI) adsorption onto β-FeOOH. This study aims to investigate the removal of Cr (VI) with β-FeOOH, including the...
Iron coated zeolite is made and its adsorption characteristics are compared with activated alumina and zero-valent iron to get further understand of the new adsorbent. The results show that iron coated zeolite removes As(V) in the similar with that by activated alumina with removal rate of 50% in first 5min's adsorption but slower after 60 mins' adsorption and faster than that by zero-valent iron...
The effects of solution pH and initial concentration on adsorption and coprecipitation of As(V) from aqueous solutions by aluminum hydroxide [Al(OH)3] for 50d and 1120d were studied. The XRD, FT-IR and SEM results indicated that there was only slight difference between the Al(OH)3 adsorbents before and after adsorption, but their crystal structure had not changed. The adsorption efficiency of As(V)...
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