Wu, Chung-HsinChung-HsinWuKuo, Chao-YinChao-YinKuoLin, Cheng-FangCheng-FangLinLo, Shang-LienShang-LienLo2009-01-142018-06-282009-01-142018-06-28200200456535http://ntur.lib.ntu.edu.tw//handle/246246/96768https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036195912&doi=10.1016%2fS0045-6535%2801%2900217-X&partnerID=40&md5=3f568b3408647a3efb1b309cd60f9df1This study examined the interactions of MoO42- + SO42-, MoO42- + SeO42-, and MoO42- + SeO32- systems on γ-Al2O3 to better understand the competitive adsorption of these anions in the natural environment. The Freundlich isotherms of anionic adsorption onto γ-Al2O3 in single and binary solutes were also investigated to estimate the competition between these anions. Experimental results indicate that a higher concentration of competitive solute yields a higher efficiency of the competitive solute's prevention of MoO42- adsorption. The most significant result was found in the MoO42- + SeO32- system. The Freundlich isotherm constant (n) increases with the competitive solute concentration. The suitability of a Freundlich-type isotherm, the Sheindorf-Rebuhn-Sheintuch (SRS) equation, and the modified SRS equation in representing the competitive adsorption of MoO42-, SO42-, SeO42-, and SeO32- γ-Al2O3 surface, was also examined. Each set of isotherm data was found to conform to linear SRS expressions, allowing competition coefficients to be derived on a concentration basis for each binary-solute system. The competition coefficient aij and relative affinity coefficients aij can be seen as a way to quantify competitive interactions. The proposed SRS and modified SRS equations are simple mathematical expressions accounting for competitive interactions of anions present in a mixture for the range of concentrations over which each individual component exhibits Freundlich behavior. © 2002 Elsevier Science Ltd. All rights reserved.application/pdf189268 bytesapplication/pdfen-USAnionic adsorption; Binary-solute adsorption; Competition coefficients; Modified SRS equation; Relative affinity coefficients; SRS equationIsotherms; Molybdenum compounds; Negative ions; Binary solutes; Adsorption; aluminum; anion; molybdic acid; selenate; sulfate; Adsorption; adsorption; article; binding affinity; calculation; chemical composition; competition; concentration (parameters); model; molecular interaction; solute; thermodynamicsjournal article119961492-s2.0-0036195912http://ntur.lib.ntu.edu.tw/bitstream/246246/96768/1/22.pdf