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Adsorptive behaviors of humic acid onto freshly prepared hydrous manganese dioxides |
| LIU Ruiping1, LI Guibai1, YANG Yanling2, HE Wenjie3, HAN Hongda3 |
| 1.School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; 2.College of Civil Engineering and Architecture, Beijing University of Technology, Beijing 100022, China; 3.Tianjin Water Supply Group Co. Ltd, Tianjin 300040, China; |
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Abstract This study focused on the adsorptive behaviors of humic acid onto freshly prepared hydrous MnO2(s) (δMnO2), and investigated the feasibility of employing δMnO2 for humic acid removal from drinking water. Effects of such parameters as molecular mass of humic acid, kinds of divalent cations on adsorptive behaviors and possible mechanisms involved were investigated. This study indicated that humic acid with higher molecular mass exhibited more tendency of adsorbing onto &MnO2 than that with lower molecular mass. Ca2+ facilitated more humic acid adsorption than Mg2+; UV-Vis spectra analysis indicated higher capabilities of Ca2+ coordinating with acidic functional groups of humic acid than that of Mg2+. Additionally, ζ potential characterization indicated that Ca2+ showed higher potential of increasing ζ potential of &MnO2 than Mg2+. Ca2+ of 1.0 mmol/L increased ζ potential of δMnO2 from -37 mV (pH 7.9) to +7 mV (pH 7.2), while 1.0 mmol/L Mg2+ increased to lower value as -9 mV (pH 6.5), correspondingly. Fourier transform infrared (FTIR) spectra demonstrated the adsorption of humic acid onto &MnO2, showing the important roles of -COO- functional groups and surface Mn-OH in the adsorption of humic acid onto &MnO2.
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Issue Date: 05 June 2007
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