NOPR Collection:

A policy Dialogue on COVID-19 Vaccine from Vaccine Self-Reliance to Global leadership, Opportunities, Challenges, and policy Imperatives in Covid Era: Brief Report

Sat, 01 May 2021 00:00:00 GMT

Title: A policy Dialogue on COVID-19 Vaccine from Vaccine Self-Reliance to Global leadership, Opportunities, Challenges, and policy Imperatives in Covid Era: Brief Report Authors: Prasanna, N K; Anu; Y, Madhavi Page(s): 378

A policy Dialogue on COVID-19 Vaccine from Vaccine Self-Reliance to Global leadership, Opportunities, Challenges, and policy Imperatives in Covid Era: Brief Report

Sat, 01 May 2021 00:00:00 GMT

Optimization of process conditions to improve copper adsorption capacity of raw and treated Algerian bentonite: Characterization, kinetics and equilibrium study

Sat, 01 May 2021 00:00:00 GMT

Title: Optimization of process conditions to improve copper adsorption capacity of raw and treated Algerian bentonite: Characterization, kinetics and equilibrium study Authors: Bouaziz, Mohamed Ghrissi; Youcef, Leila; Kheliel, Oussama; Benalia, Mohamed Charif Abstract: Raw bentonite (RB) locally available in Mostaganem (Algeria) deposit has been treated in the presence of NaOH (B-NaOH), MgCl2 (B-MgCl2) and H2SO4 (B-H2SO4) to improve its adsorption ability for the removal of copper ions from aqueous solutions. Characterization of all adsorbents supported montmorillonite, illite and kaolinite as major clay minerals identified for the raw and treated bentonites and proved the aluminosilicate structure of the clays. In synthetic solutions, the adsorption equilibrium of copper onto RB, B-MgCl2 and B-H2SO4 is reached in 30 min. while, equilibrium is reached after 4 hours when using B-NaOH. The adsorption kinetics are well described by the pseudo-second-order model. The adsorption of copper is pH-dependent. The Langmuir, Freundlich and Dubinin-Radushkevich isotherms indicate a suitable fit between the experimental data and models. The corresponding parameters indicate that the sorption mechanism might be physical in nature. The maximum adsorption capacities of Langmuir that are obtained are in the following order 25.1 mg/g (RB) < 28.03 mg/g (B-H2SO4) < 39.89 mg/g (B-MgCl2) < 72.80 mg/g (B-NaOH). The removal efficiency of copper in industrial wastewater was 45.75 %, 55.22 %, 63.27 % and 70.39 % using RB, B-MgCl2, B-H2SO4 and B-NaOH, respectively. The B-NaOH exhibit a higher adsorption capacity of copper with the other tested bentonites. Page(s): 249-261

Natural carbohydrate gums based hydrogels

Sat, 01 May 2021 00:00:00 GMT

Title: Natural carbohydrate gums based hydrogels Authors: Balodhi, Divya; Khushbu; Warkar, Sudhir G; Rani, Archana; Gupta, Rajinder K Abstract: The future of good research lies in the search of innocuous material development, based primarily on natural resources. Keeping in this perspective, four different natural gums namely, Locust bean Gum, Gum Ghatti, Gum Tragacanth, and, Gum Acacia, are used to synthesize four different novel hydrogels via free radical polymerization method with sodium acrylate and acrylamide. The synthesis is evident with the help of characterization using TGA (Thermo Gravimetric Analysis), FTIR (Fourier Transform Infrared Spectroscopy), SEM (Scanning Electron Microscope), 13C NMR (Nuclear Magnetic Resonance), and swelling studies in buffer solutions of pH 4, pH 7.4, pH 9.2, and, in distilled water. The synthesized hydrogels are potent enough in its potential utility in pharmaceuticals, drug delivery, tissue engineering as scaffolds that generally mimic human skin and in wound healing activity by incorporating the drug into it. Page(s): 262-273