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      저자 : Himani Saini (검색결과 2 건)
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      • KCI등재후보

        Prediction of product parameters of fly ash cement bricks using two dimensional orthogonal polynomials in the regression analysis

        S. Chakraverty,Himani Saini,S. K. Panigrahi 사단법인 한국계산역학회 2008 Computers and Concrete, An International Journal Vol.5 No.5

        This paper focuses on the application of two dimensional orthogonal polynomials in the regression analysis for the relationship of product parameters viz. compressive strength, bulk density and water absorption of fly ash cement bricks with other process parameters such as percentages of fly ash, sand and cement. The method has been validated by linear and non-linear two parameter regression models. The use of two dimensional orthogonal system makes the analysis computationally efficient, simple and straight forward. Corresponding co-efficient of determination and F-test are also reported to show the efficacy and reliability of the relationships. By applying the evolved relationships, the product parameters of fly ash cement bricks may be approximated for the use in construction sectors.

      • KCI등재

        Facile synthesis of boron and nitrogen doped TiO2 as effective catalysts for photocatalytic degradation of emerging micro-pollutants

        Vandana Yadav,Himani Sharma,Amit Rana,Vipin K. Saini 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-

        The development of photocatalysts for efficient photodegradation of emerging water pollutants is a subjectof global concern in recent years. In this study, the photophysical properties of TiO2 were modified bydoping with different concentrations of boron (B-TiO2) and nitrogen (N-TiO2) by following a sol–gel routeof synthesis. The type and concentration of dopants were optimized to achieve maximum degradation ofacetaminophen (ACT) and monocrotophos (MCP) in aqueous solutions. UV DRS analysis shows that thebandgap of TiO2 (3.2 eV) reduced up to 2.96 and 2.27 eV in B-TiO2 and N-TiO2 samples, respectively. The presence of dopants inside the crystal lattice of doped TiO2 was confirmed with X-ray diffraction(XRD), Micro Raman, Fourier Transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy(XPS). The XRD data confirmed that the presence of these dopants promotes the rutile phasetransformation in TiO2 to various extents. The doping of B decreased the surface area and pore volumeof TiO2, whereas N doping had increased these properties. The XPS spectra showed the formation ofTi-O-B and Ti-O-N type linkage, indicating the presence of interstitial B and substitutional N atoms inTiO2 crystal lattice. The B doped samples exhibit more enhancement in photodegradation efficiency ascompared to N doped samples. Under optimized conditions, 5% B-TiO2 showed 95% and 71% degradationof ACT and MCP, respectively. The degradation pathway for both ACT and MCP involving their intermediateswas discussed through Mass spectrometry analysis. The cost-effectiveness of the most efficientdoped catalysts and commercial catalysts were compared with the ACER tool and turnover frequency.

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