![]() The non-availability of high quality activated carbon in the Bangladesh market, to cater to the needs of the pharmaceutical and fine chemical sector has necessitated imports into Bangladesh. It is a versatile product with good market demand. Activated carbon has several important usages including solution purification, removal of tastes and odors from domestic and industrial water supplies, vegetable and animal fats and oils, alcoholic beverages, chemicals and pharmaceuticals and in the waste water treatment. 2013), and for nitrogen adsorption/desorption (Liu et al. Activated carbon derived from alkali treated rice husk indicated good adsorption capacity for methylene blue in aqueous solutions (Lin et al. Since the modern dyes are stable in aquatic system, biological treatments for eradication of textile and dyeing effluents are ineffective (Dai et al. ![]() Due to the release of dyes in aquatic ecosystem a dramatic consequences caused through the toxicity, aesthetic pollution and perturbations in aquatic life. About 20 % of synthetic dyes are lost in the waste water stream that is also important source of pollution (Zollinger 1991). The dyes are pollutants of high environmental impact, because of their widespread use and their potential to toxic aromatic amines accounting approximately 50 % of worldwide production (Guettai and Amar 2005 Rys and Zollinger 1992). Textile and dyeing industries produces huge polluted waste water and drains into natural water shade, canals, rivers and lagoons etc. It is the porous structure and chemical nature of the surface of active carbons that govern this property, both of which are related to the crystalline composition. One of the main characteristics of activated carbon is their adsorption capacity. It, also called activated charcoal or activated coal, is a form of carbon that has been processed to make it extremely porous and thus to have a very large surface area available for adsorption or chemical reactions. ![]() It is capable to attract molecules to internal surface and is therefore, called adsorbent. The activated carbon can adsorb a wide variety of substances including different types of dyes and heavy metals. This study shows a method and possibility of activated carbon from agro-waste, and it could be scaled up for commercial production.Īctivated carbon is highly porous in its structure, non-hazardous, carbonaceous material having a large internal surface area. It is concluded from this study that porous bio-char and activated carbon could be prepared in normal environmental conditions instead of inert media. The surface area of porous carbon and activated carbon are found to be 28, 331 and 645 m 2 g −1 for raw rice husk char, silica removed rice husk char and zinc chloride activated rice husk char, respectively. The adsorption capacity of material increased due to removal of silica and due to the activation with zinc chloride compared to using raw rice husk char. The study results shows that porous carbon is prepared successfully without using any inert media. The study is conducted at low oxygen environment by applying biomass for consuming oxygen inside reactor and double crucible method (one crucible inside another) is applied to prevent intrusion of oxygen into the char. Furthermore, the char is activated by using chemical activation under high temperature. Porousness of rice husk char could be enhanced by removing the silica from char and applying heat at high temperature. ![]() ![]() Rice husk char contains high amount silica that retards the porousness of bio-char. Preparation porous bio-char and activated carbon from rice husk char study has been conducted in this study. ![]()
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