title: Biosorption of methylene blue from aqueous solution by rice husk in a fixed-bed column.
abstract: In this study, the ability of rice husk to adsorb methylene blue (MB) from aqueous solution was investigated in a fixed-bed column. The effects of important parameters, such as the value of initial pH, existed salt, the flow rate, the influent concentration of MB and bed depth, were studied. The Thomas model was applied to adsorption of MB at different flow rate, influent concentration and bed depth to predict the breakthrough curves and to determine the characteristic parameters of the column useful for process design using non-linear regression. The bed-depth/service time analysis (BDST) model was also applied at different bed depth to predict the breakthrough curves. The two models were found suitable for describing the biosorption process of the dynamic behavior of the rice husk column. All the results suggested that rice husk as adsorbent to removal MB from solution be efficient, and the rate of biosorption process be rapid. When the flow rate was 8.2ml min(-1) and the influent concentration of MB was 50mgl(-1), the equilibrium adsorption biomass reached 4.41mgg(-1) according to Thomas model.
authors.affiliation: Department of Chemistry, Zhengzhou University, 75 Da Xue North Road, Zhengzhou 450052, PR China. rphan67@zzu.edu.cn
authors.forename: Runping
authors.initials: R
authors.lastname: Han
authors.forename: Yuanfeng
authors.initials: Y
authors.lastname: Wang
authors.forename: Weihong
authors.initials: W
authors.lastname: Yu
authors.forename: Weihua
authors.initials: W
authors.lastname: Zou
authors.forename: Jie
authors.initials: J
authors.lastname: Shi
authors.forename: Hongmin
authors.initials: H
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D002122:Calcium Chloride / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008751:Methylene Blue / Q000737:chemistry*; D008956:Models, Chemical; D012275:Oryza; D012965:Sodium Chloride / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D004396:Coloring Agents; D014874:Water Pollutants, Chemical; D012965:Sodium Chloride; D002122:Calcium Chloride; D008751:Methylene Blue