SRM University

About: SRM University is a education organization based out in Chennai, India. It is known for research contribution in the topics: Computer science & Population. The organization has 10787 authors who have published 11704 publications receiving 103767 citations. The organization is also known as: Sri Ramaswamy Memorial University.

Bagasse based biochar for the adsorptive removal of chlorpyrifos from contaminated water

Abstract: Chlorpyrifos (CPS) is an emerging contaminant due to the runoff of CPS from agricultural fields, which find its way to nearby water sources. CPS requires to be removed to ensure the availability of safe drinking water. In this paper we report the experimental investigations carried out for the removal of CPS from waste water streams using bagasse based biochar as an adsorbent. Three different types of biochar were prepared from bagasse through different treatment to the raw bagasse. After identifying the best of the three types of biochar through iodine and methylene blue uptake, experiments were carried out to assess the removal of CPS from the aqueous systems containing 10–50 ppm. The results indicate about 89 % removal from an initial concentration of 10 ppm CPS. The bagasse was also characterized for its morphological and physiochemical characteristics. The optimal conditions for maximum uptake with respect to contact time, pH, initial CPS concentration, initial adsorbate concentration and temperature were studied. The isotherm models were evaluated and the results from error function analysis indicated Freundlich isotherm to be the most suitable model. The maximum adsorption capacity q m of the biochar for CPS was 3.20 mg g−1. The kinetics data was best fitted with the pseudo second order model. CPS adsorption onto the biochar occurred in a spontaneous manner, was exothermic and involved physisorption.

Synthesis of highly visible light active TiO2-2-naphthol surface complex and its application in photocatalytic chromium(VI) reduction

Abstract: Photocatalysis is an effective approach for the removal of heavy metal ions present in the aquatic bodies In this report, TiO2 nanoparticles were successfully functionalized with 2-naphthol (2-NAP) using simple and scalable condensation reaction The prepared photocatalyst was demonstrated as superior visible light photocatalyst for the effective reduction of Cr(VI) The 2-NAP functionalized TiO2 displayed a remarkable enhancement in the photocatalytic reduction of Cr(VI) under visible light irradiation (λ > 400 nm) The maximum Cr(VI) reduction of about 100% (7 fold higher activity than bare TiO2) was achieved within 3 h The discernible enhancement in the photocatalytic reduction of TiO2-2-NAP can be ascribed to improved optical absorption in visible region, high crystallinity of TiO2 and high surface area In addition, the photogenerated electron transfer from 2-NAP to TiO2 (ligand to metal transfer) can significantly improved the photocatalytic performance than bare TiO2 counterparts Therefore, the functionalization of metal oxides with organic ligands can open new directions to overcome the existing limitations in photocatalysis

100 GHz zinc oxide Schottky diodes processed from solution on a wafer scale

Abstract: Inexpensive radio-frequency devices that can meet the ultrahigh-frequency needs of fifth- and sixth-generation wireless telecommunication networks are required. However, combining high performance with cost-effective scalable manufacturing has proved challenging. Here, we report the fabrication of solution-processed zinc oxide Schottky diodes that can operate in microwave and millimetre-wave frequency bands. The fully coplanar diodes are prepared using wafer-scale adhesion lithography to pattern two asymmetric metal electrodes separated by a gap of around 15 nm, and are completed with the deposition of a zinc oxide or aluminium-doped ZnO layer from solution. The Schottky diodes exhibit a maximum intrinsic cutoff frequency in excess of 100 GHz, and when integrated with other passive components yield radio-frequency energy-harvesting circuits that are capable of delivering output voltages of 600 mV and 260 mV at 2.45 GHz and 10 GHz, respectively. Nanoscale electrodes fabricated using adhesion lithography can be combined with solution-processed metal oxide semiconductors to create Schottky diodes with performance suitable for 5G communications and beyond.