title: Adsorption of hexavalent chromium from aqueous solution by modified corn stalk: a fixed-bed column study.
abstract: Continuous fixed-bed column studies were carried out by using modified corn stalk (MCS) as an adsorbent for the removal of Cr(VI) from aqueous solution. The effect of various parameters like bed depths (1.4, 2.2 and 2.9 cm), flow rate (5, 10 and 15 mL/min), influent Cr(VI) concentrations (100, 200 and 300 mg/L) and influent solution pH (2.66, 4.91 and 5.66) was investigated. The exhaustion time increased with increase of bed depth, decrease of flow rate and influent concentration. The Adams-Bohart, Thomas and Yoon-Nelson models were applied to the adsorption under varying experimental conditions to predict the breakthrough curves and to evaluate the model parameters of the fixed-bed column that are useful for process design. The Thomas and Yoon-Nelson models were in good agreement with the experimental data. The MCS column study states the value of the excellent adsorption capacity for the removal of Cr(VI) from aqueous solution.
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
authors.forename: Suhong
authors.initials: S
authors.lastname: Chen
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.forename: Xing
authors.initials: X
authors.lastname: Xu
authors.forename: Kaifang
authors.initials: K
authors.lastname: Fu
mesh_terms: D000327:Adsorption; D002857:Chromium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008962:Models, Theoretical; D012996:Solutions; D014867:Water / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry*
chemical_list: D012996:Solutions; D014867:Water; D002857:Chromium