PSG College of Technology

About: PSG College of Technology is a based out in . It is known for research contribution in the topics: Machining & Thin film. The organization has 3174 authors who have published 3575 publications receiving 40690 citations.

Potential landfill site selection for solid waste disposal using GIS and multi-criteria decision analysis (MCDA)

Abstract: Proper solid waste disposal is an important socioeconomic concern for all developing countries. Municipalities have their own policies, individual approaches and methods to manage the solid wastes. They consider wastelands outside the urban area as the best suitable for the solid waste disposal. Such improper site selection will create morphological changes that lead to environmental hazards in the urban and its surrounding areas. In this research, the site selection for urban solid waste disposal in the Coimbatore district used geographical information system (GIS) and multi-criteria decision analysis (MCDA). Thematic layers of lineament density, landuse/landcover, population density, groundwater depth, drainage density, slope, soil texture, geology and geomorphology were considered as primary criteria and weights for criteria, and sub-criteria were assigned by MCDA analysis. The resultant weight score was validated by consistency ratio so that the efficiency of the selected criteria was justified. The overlay analysis in GIS environment provides 17 potential zones in Coimbatore district, among which, four suitable sites were screened and refined with the help of field investigation and visual interpretation of satellite image. The result of landfill suitability map shows the effectiveness of the proposed method.

Boosted visible-light photocatalytic performance of TiO2-x decorated by BiOI and AgBr nanoparticles

Abstract: The prominent visible-light-responsive TiO2-x/BiOI/AgBr photocatalysts with p-n-n heterojunctions were synthesized via a mild hydrothermal method, followed by precipitation approach at room temperature. All of the obtained results illustrated that the ternary TiO2-x/BiOI/AgBr nanocomposites act as a highly efficient photocatalysts for different dyes decomposition compared to the TiO2, TiO2-x, and TiO2-x/BiOI photocatalysts. The remarkable visible light photocatalytic performance for the TiO2-x/BiOI/AgBr photocatalysts is ascribed to striking visible-light absorption capability, plenteous active sites, and reinforced charge separation repressed by p-n-n heterojunctions, which were evidenced by optical, textural, and photoelectrochemical characterizations. The TiO2-x/BiOI/AgBr (10%) photocatalyst with considerable reusability exhibited substantial visible-light photoactivity towards RhB, MB, and fuchsine degradations, in which RhB, MB, and fuchsine degradation percentages are 98% (at 60 min), 99% (at 300 min), and 76% (at 300 min), respectively. Additionally, the results of quenching tests suggested that holes and superoxide radicals have a notable character in the degradation process. The strategy to construct these multi-heterojunction photocatalysts can give an innovative perspective to design highly efficient systems for solving environmental pollution crisis using TiO2 under visible light.