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This paper reports the growth mechanism of sol–gel derived nanocrystalline ZnO powder. The influence of pH value on the particle size and its properties are studied using X-ray diffraction, UV, Fourier transform infrared spectroscopy, photoluminescence (PL), and impedance spectroscopy. UV analysis reveals an increase in bandgap due to decrease in particle size. The strong UV emission along with some...
The work investigated that δ-MnO2 / Polymeric ferric sulfate (PFS) treated on electroplating wastewater containing heavy metal ions Cu2+, Pb2+, Cr3+. Effect adsorption on the pH, the amount of adsorbent, the input order and ratio of δ-MnO2 / PFS, the research determined the laboratory simulated electroplating wastewater treatment process and other basic parameters. The results showed that the best...
The red clay was used as absorbent to treat fluoride wastewater by adsorption. And the effects of liquid-solid ratios, pH and reaction time on removel of fluoride were investigated. The results shown that the removel fluoride was realizable by physical and chemical adsorption, and the physical adsorption was dominant. The liquid-solid ratios, pH and reaction time were 50g/L, 9.0 and 1.5h, respectively,...
This study evaluated the effects of salinity and alkalinity of soil on growth of Haloxylon sp. in Segzi plain. Segzi plain is located in the Eastern part of Isfahan province in the center of Iran and is about 40 kms from Isfahan center. The phenomena of salinity and alkalinity are the key factors in the process of desertification that are mainly created in semiarid and arid regions. One way to prevent...
A batch experiment was conducted to study the effect of pH and temperature on absorption and desorption of copper in soil, soil samples were collected from the vicinity of a copper tailings yard. The results showed that the pH value is one of the most important factors that influence the adsorption of copper. The Cu adsorption was reduced at the low pH. By increasing the pH value, the adsorption increased...
The avain feather is natural polymer material resources. It includes large quantity of keratin, among of which proteins take up 83%. The feathers modified by methyl methacrylate at Ammonium Persulfate(APS)-Sodium Bisulfite(SBS) as initiator are applied to treat chrome tanning waste water. The factors such as dosage, pH of chrome tanning waste water, adsorption time were discussed. The adsorption conditions...
In a phosphate buffer medium of pH 7.0, free iodine liberated through the oxidation of I- by IO3-, reacts with excess I- to form a binary complex of I3-, which reacts further with CTMAB to form a ternary ion association complex of CTMA+ldrI3-. This ternary complex is easily soluble and kept stable in organic solvents, in which it has absorption maximum at 365 nm. In the presence trace amounts of...
A novel spectrophotometric method for the determination of trace amount of Chromium (VI) by tri-hydroxyl phenylfluorone (THPF) in the microemulsion medium has been developed. All the variables were studied in order to optimize the reaction conditions. At pH = 5.82, Cr(VI) reacts with THPF to form a 1 : 2 complex, which has a maximum absorption at 560 nm with a molar absorptivity of 8.99times104 L/mol/cm...
Zinc sulfide nanoparticles were prepared by hydrothermal method and characterized by TEM, FT-IR and BET surface area. The titration results show that the surface of ZnS nanoparticles possessed an obvious acid-base property. With increasing the amount of ZnS nanoparticles in the suspension, the pH buffer capacity of solution increased dramatically. There is a proportional relationship between the amount...
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