Shivaraju Hp

Publications (5) View all

• Article: Photocatalytic treatment of organic pollutants in textile effluent using hydrothermally prepared photocatalytic composite

  H. P. Shivaraju, C. P. Sajan, T. Rungnapa, V. Kumar, C. Ranganathaiah, K. Byrappa
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  ABSTRACT: The hydrothermal synthesis of TiO2 nanoparticles on the surface of calcium aluminosilicate beads of 0·5–1·0 mm in diameter has been carried out under mild hydrothermal conditions. The advantage of immobilisation of the TiO2 nanoparticles by coating on calcium aluminosilicate beads is the ease and efficiency to recover the photocatalyst. The experimental temperature was varied from 150 to 220°C and the experimental duration was 24 h with an autogenous pressure in 1M HCl as solvent. A systematic characterisation of TiO2 coated calcium aluminosilicate beads was carried out by employing analytical techniques like X-ray powder diffraction, SEM, FTIR spectroscopy and positron annihilation lifetime spectroscopy. The photocatalytic treatment of toxic organic pollutants in textile effluents was studied using hydrothermally prepared TiO2 coated calcium aluminosilicate beads. The photodegradation characteristics were studied under both sunlight and ultraviolet light source on the degradation of organic pollutants. Several parameters like concentration and dilution factors of effluents, light source and intensity, initial pH of medium, experimental duration and catalyst loaded into the aqueous medium of textile effluent were studied. The degradation reaction was optimised with respect to the experimental duration and catalytic loaded. The reduction in the chemical oxygen demand (COD) and %T revealed the minimisation of organic pollutants along with colour removal from the textile effluent.
  Material Research Innovations 01/2010; 14(1):80-86. · 0.41 Impact Factor
• Article: Hydrothermal coating of ZnO onto calcium alumino silicate beads and their application in photodegradation of amaranth dye

  H. P. Shivaraju, K. Byrappa, M. B Shayan, T. Rungnapa, S. Pakamard, V. Kumar, S. Ananda
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  ABSTRACT: Hydrothermal coating of ZnO nanoparticles onto the surface of calcium alumino silicate beads was carried out under hydrothermal conditions (T, 220°C; P, 300 psi; duration, 12 h). The reagent grade ZnO and calcium alumino silicate beads (0·5–1·0 mm in diameter, specially prepared as supporting material for ZnO) were used as starting materials along with 1M NaOH as a mineraliser leading to the formation of a new class of photocatalytic material. The effect of the hydrothermal experimental parameters on the coating of ZnO nanoparticles, and the grain morphology, etc. was investigated and thus obtained ZnO coated calcium alumino silicate beads were characterised using X-ray diffraction, SEM, Fourier transform infrared and positron annihilation spectroscopy. Sunlight and ultraviolet light mediated photocatalytic degradation of amaranth dye was studied using hydrothermally prepared ZnO coated calcium alumino silicate beads. The effect of various parameters such as initial dye concentration, catalytic loading, pH of the medium, time duration and light source on the photodegradation of amaranth dye was investigated. Silk industrial effluents containing amaranth dye as a major constituent along with other dyes and dyeing auxiliaries were treated using ZnO coated calcium alumino silicate beads.
  Material Research Innovations 01/2010; 14(1):73-79. · 0.41 Impact Factor
• Article: Photocatalytic degradation of textile effluent using hydrothermally synthesised titania supported molybdenum oxide photocatalyst

  C. P. Sajan, B. Shahmoradi, H. P. Shivaraju, K. M. Lokanatha Rai, S. Ananda, M. B. Shayan, T. Thonthai, G. V. Narasimha Rao, K. Byrappa
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  ABSTRACT: The photocatalytic degradation of textile effluent using hydrothermally synthesised titania supported molybdenum oxide photocatalyst at 200°C with an autogenous pressure and experimental duration of 24 h has been reported. A control over the particle size, morphology and crystallinity of the photocatalyst has been studied with respect to the experimental parameters such as nutrient composition, solvent, pH, experimental duration, temperature and pressure. The products synthesised were characterised using XRD, SEM, FTIR, etc. The photodegradation of textile effluent using these composite was investigated under both solar and ultraviolet irradiation. The degradation of textile effluent was checked by the following parameters: chemical oxygen demand (COD), percentage transmission (%T), irradiation time and duration. The preliminary results are highly encouraging and further work is being carried out for the use of these photocatalytic compounds for other organic decomposition.
  Material Research Innovations 01/2010; 14(1):89-94. · 0.41 Impact Factor
• Article: Photocatalytic degradation of textile effluents using hydrothermally sunthesized titania supported molybdenum oxide catalyst, Materials Research Innovations, 2010, 14, 89-94.

  C.P. Sajan, B. Shamoradi, H.P. Shivaraju, K.M.L. Rai, S. Ananda, T. Thonthai, G.V.N. Rao, K. Byrappa
  Material Research Innovations 01/2010; 14:89. · 0.41 Impact Factor
• Source

  Available from: Chikkakuntappa Ranganathaiah

  Article: Hydrothermal Synthesis and Characterization of TiO2 Nanosturctures on the Ceramic Support and their Photo-catalysis Performance

  H P Shivaraju, K Byrappa, T M S Vijay Kumar, C Ranganathaiah
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  ABSTRACT: Tel: +91‐821‐2419627 (Work/Fax); 09902358233 (Personal) Nanostructures deposited on the supports have several advantages like large surface area, controlled morphology, size, porosity, mechanical properties and flexibility in the surface functionalities to obtain desired surface chemistry. Hydrothermal preparation of TiO 2 nanostructures on the surface of calcium alumino-silicate ceramic beads (CASB) was carried out under mild hydrothermal conditions (T=150 to 220ºC and duration-24-48 h) by using suitable mineralizers like NaOH, HCl, H 2 SO 4 , H 2 O. An efficient deposition and superior properties of TiO 2 nanostructures on the surface of CASB supports were confirmed through a systematic characterization using XRD, SEM, FTIR and positron annihilation spectroscopy techniques. In the present work deposition of TiO 2 nanowires and whiskers on the surface of CASB supports is reported. Photocatalytic properties of TiO 2 nanostructures deposited CASB supports were investigated by photodegradation of Indigo Carmine dye and achieved a photodegradation efficiency upto 90-93% under UV light.