N-doped mesoporous alumina for adsorption of carbon dioxide

N-doped mesoporous alumina has been synthesized using chitosan as the biopolymer template. The adsorbent has been thoroughly investigated for the adsorption of CO₂ from a simulated flue gas stream (15% CO₂ balanced with N₂) and compared with commercially available mesoporous alumina procured from SASOL, Germany. CO₂ adsorption was studied under different conditions of pre-treatment and adsorption temperature, inlet CO₂ concentration and in the presence of oxygen and moisture. The adsorption capacity was determined to be 29.4 mg CO₂/g of adsorbent at 55℃. This value was observed to be 4 times higher in comparison to that of commercial mesoporous alumina at a temperature of 55℃. Basicity of alumina surface coupled with the presence of nitrogen in template in synthesized sample is responsible for this enhanced CO₂ adsorption. Adsorption capacity for CO₂ was retained in the presence of oxygen; however moisture had a deteriorating effect on the adsorption capacity reducing it to nearly half the value.     

Unprecedented Chitin and Chitosan: A Chemical Overview

Chitin and Chitosan are polysaccharide polymers. Polysaccharide is a carbohydrate whose molecules consist of a number of sugar molecules bonded together. It contains more than 5,000 acetylglucosamine and glucosamine (sugar) units, respectively and their molecular weights are over one million Daltons. Most of the naturally occurring polysaccharides are neutral or acidic in nature, whereas Chitin and Chitosan are examples of highly basic polysaccharides. Chitin is isolated from crab and shrimp waste and is a renewable resource. It is widely accepted that this biopolymer is an important biomaterial in many aspects. This review explores the various aspects of Chitin research.     

Arsenite removal from drinking water by bark-based magnetic iron oxide particle (BMIOP): a column study

Environmental Science and Pollution Research - The removal of arsenite [As(III)] from drinking water was investigated in a column at flow rates of 2.0 and 5.0 mL/min (up-flow direction)...