Abstract

AbstractThe present comparison study describes the effectiveness of different carbon based adsorbents for the successful removal of Rhodamine B (RhB) from wastewater. Selected adsorbents are rice husk (RH) and coconut husk (CH) as the agricultural waste products and porous carbon synthesized by resorcinol formaldehyde polymerization via sol gel method (SC). Such porous materials were functionalized using nitric acid. Morphology of the materials were examined by the Scanning electron microscope (SEM) and the surface functionalities were determined by FT-IR spectroscopy. Adsorption of all functionalized and raw porous materials was determined by varying parameters such as pH of the medium, adsorbent dosage, dye concentration and contact time. Generally, all the selected adsorbents were capable of removing RhB and functionalized adsorbents were much effective than the untreated adsorbents. Among all the adsorbents selected for the comparison, functionalized rice husk (FRH) showed highest activity compared to other adsorbents as it consists of both carbon and silica, while others have only carbon. Interestingly adsorbents prepared by natural waste materials were more effective than the synthetic carbon suggesting that these tested materials could be used in novel water purification systems to decontaminate waste and drinking water.KeywordsRice huskCoconut huskResorcinol–formaldehydeNitric acidRhodamine BWastewater

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