Browsing by Author "Ram Prakash Singh"

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A different approach to the electronic waste handling - A review
(Elsevier Ltd, 2021) Shivam Nigam; Rohit Jha; Ram Prakash Singh
The beginning of the 21st century has already witnessed the devastating effects of climate change on human civilization. Like Climate change, electronic waste is also a by-product of the industrial revolution and development. As we progress, we leave behind technologies that could not match up with the demand of time. Technologies that were considered the most advanced in their era were discarded for human civilization's ever-growing needs. These discarded reminiscences of old times are still physically and chemically active and continuously interacting with the surroundings. This study focuses on key factors contributing to the generation of wastes, its growth rate, possible ways to slow down the generation, and ways to tackle its already existing volume. We have discussed how e-waste handling is primarily a result of a short-sighted approach against the widely accepted perspectives. We have addressed different legislation, conventions, and initiatives worldwide, but collectively they are still not enough for a sustainable future. We have also given a brief overview of recycling processes. Different outlooks to approach e-waste handling have also been shown. This paper serves as an educative medium for the present scenario and its extrapolation to the near future. © 2021 Elsevier Ltd. All rights reserved.
Synthesis, characterization and application of novel cationic and amphoteric flocculants based on amylopectin
(Elsevier Ltd, 2015) Krishna Kumar; Pubali Adhikary; N.C. Karmakar; Suprakash Gupta; Ram Prakash Singh; S. Krishnamoorthi
The synthesis of novel cationic flocculants based on amylopectin (AP), acrylamide (AM) and (3-acrylamidopropyl) trimethylammonium chloride (ATMAC) were done by free radical polymerization using ammonium persulphate (APS) as an initiator. Three different grades of novel cationic flocculants (AP-g-C 1 to AP-g-C 3) were synthesized by varying the proportion of acrylamide and (3-acrylamidopropyl) trimethylammonium chloride monomers. Through the hydrolysis of these flocculants, in presence of NaOH, three different grades of amphoteric polymers (AP-AT-C 1 to AP-AT-C 3) were synthesized. The synthesized polymers were characterized by various methods, namely, infrared spectroscopy, NMR spectroscopy, thermal analysis, viscosity measurement, scanning electron microscopy and X-ray diffractometry. The flocculation performance of AP-g-C and AP-AT-C were studied in kaolin suspension using jar test and settling test methods at neutral pH. Dye (Methylene blue) removal tests were performed using polymer beads and analysed by UV-vis spectroscopy. © 2015 Elsevier Ltd. All rights reserved.