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Nanoparticles of TiO2 were synthesized and characterized by XRD, BET, TG/DTA and TEM measurements. The commercial azo dye Reactive Red 195 (RR195) was selected as a model dye in order to examine the adsorption capacity of TiO2 at room temperature, under dark conditions. It was demonstrated that RR195 could be efficiently adsorbed in aqueous suspension of TiO2. A study on the effects of various parameters like initial pH, concentration of dye and concentration of adsorbent has been carried out in order to find optimum adsorption conditions. The optimum pH of sorption was 3. Substantial reduction of COD, besides removal of colour, was also achieved. The experimental data were analyzed by the Langmuir and Freundlich adsorption models. Equilibrium data fitted very well with the Langmuir model signifying the energetic homogeneity of TiO2 surface adsorption sites. At the temperature of 30 degrees C, the maximum monolayer adsorption capacity obtained from the Langmuir model is approximately 87 mg/g (pH 3.0). Kinetic studies were carried out and showed a rapid sorption of dye in the first 30 min while equilibrium was reached at 1h. Three kinetic adsorption models were used to describe the kinetics data, the pseudo-first-order model, the pseudo-second-order model and the intraparticle diffusion model. The sorption kinetics of dye was best described by the pseudo-second-order kinetic model.
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PMID:Removal of Reactive Red 195 from aqueous solutions by adsorption on the surface of TiO2 nanoparticles. 1954 Jun 70

In the present study, FT-IR, XRD, TGA-DTA spectral methods have been used to investigate the chemical compositions of urinary calculi. Multi-components of urinary calculi such as calcium oxalate, hydroxyl apatite, struvite and uric acid have been studied. The chemical compounds are identified by FT-IR spectroscopic technique. The mineral identification was confirmed by powder X-ray diffraction patterns as compared with JCPDS reported values. Thermal analysis techniques are considered the best techniques for the characterization and detection of endothermic and exothermic behaviors of the urinary stones. The percentages of each hydrate (COM and COD) are present together, in the presences of MAPH or UA. Finally, the present study suggests that the Urolithiasis is significant health problem in children, and is very common in some parts of the world, especially in India. So that present study is so useful and helpful to the scientific community for identification of latest human health problems and their remedies using spectroscopic techniques.
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PMID:FT-IR spectroscopic, thermal analysis of human urinary stones and their characterization. 2530 35

The present study reports use of the catalytic peroxidation (CPO) method for treatment of actual fertilizer industry wastewater (FIW) by using copper-loaded Santa Barbara amorphous-15 (Cu/SBA-15) catalyst. FIW consists of toxic nitrogenous and phosphorus containing compounds that are not easily degraded by the conventional physicochemical and biological treatment methods. In the present study, Box-Behnken (BB) experimental design methodology was used for optimization of three independent parameters namely catalytic dose (m), initial pH (pHo), and H2O2 concentration. Maximum 83% COD removal was obtained at m = 4.5 g L(-1), pHo = 9.2 and H2O2 concentration = 2.0 mL L(-1). Wastewater and catalyst recovered at optimum treatment condition were characterized by various techniques. UV-visible and Fourier transform infrared (FTIR) techniques were used for understanding the treatment mechanism. Textural and thermogravimetric (TGA/DTA) analysis were used for determining the characteristic of catalyst before and after treatment. The stability and performance of the Cu/SBA-15 catalyst was also determined by using the reusability tests.
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PMID:Treatment of fertilizer industry wastewater by catalytic peroxidation process using copper-loaded SBA-15. 2632 62