الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 157 |  |  |
| | | from | 157 | | |
Abstract
The increasing demand for commercial dyes in various industries leads to the vast production of dyes which discharged directly without treatment into the aqueous media. In developing nations, environmental pollution, particularly water pollution, which arises due to the discharge of untreated industrial effluents into main water streams, is of major concern. These effluents containing dyes and pigments are regularly discharged into the natural water bodies by industries like textile, cosmetics, rubber, plastics, paper and pharmaceutical. These dyes have so many adverse effects not only on the aquatic flora and fauna but also on the human health. Large water bodies can be colored even with small quantities of dyes, which not only affect visual quality but also diminish light penetration and photosynthesis. Many of these dyes are of toxic nature and harmful effects. So the effluents containing these coloring agents have to be removed appropriately earlier that they are discharged into the aquatic forms. Among these dyes, methylene blue (MB) is frequently used coloring substance for dying cotton, wood, and silk. It can cause harmful effect upon inhalation which shows the necessity for effective removal of the dye from the the untreated effluent. During the previous year, several technologies comprising biological, chemical, and physical methods have been reported for the removal of dyes from polluted water. Among these approaches of dye removal, adsorption technique is one of the utmost operative methods for treatment of wastewater in terms of cost, simple design, and easiness to operate. Adsorption is regarded as an easy, efficient, and economic process because it gives the best results with no harmful side products and therefore generates high quality treated effluents. Therefore, in recent years, this has prompted a growing research interest in using various conventional agricultural wastes as an adsorbent for the removal of contagious pollutant. The present study is concerned with characterization and applications of rice straw and rice husk in the removal of MB dye from its aqueous solutions. Rice straw and rice husk are agricultural by-products of the rice cultivation. The utilization of this source of agricultural waste would solve both a disposal problem as well as access to a cheaper material for adsorption in water pollutants control system. Since, the main components of rice straw and husk are carbon and silica SiO2 in hydrated amorphous form, it has the potential to be used as an adsorbent. The effectiveness of various adsorbents generated from rice husk and rice straw under different physico-chemical process parameters and their comparative adsorption capacity towards dye adsorption has also been presented as follows.