کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9679008 | 1454616 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dissolution of kaolinite induced by citric, oxalic, and malic acids
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Kaolinite is a dominant clay mineral in the soils in tropical and subtropical regions, and its dissolution has an influence on a variety of soil properties. In this work, kaolinite dissolution induced by three kinds of low-molecular-weight organic acid, i.e., citric, oxalic, and malic acids, was evaluated under far-from-equilibrium conditions. The rates of kaolinite dissolution depended on the kind and concentration of organic acids, with the sequence Roxalate>Rcitrate>Rmalate. Chemical calculation showed the change in concentration of organic ligand relative to change in concentration of organic acid in suspensions of kaolinite and organic acid. The effect of organic acid on kaolinite dissolution was modeled by species of organic anionic ligand. For oxalic acid, L2âoxalic and HLâoxalic jointly enhanced the dissolution of kaolinite, but for malic and citric acids, HLâmalic and H2Lâcitric made a higher contribution to the total dissolution rate of kaolinite than L2âmalic and L3âcitric, respectively. For oxalic acid, the proposed model was RSi=1.89Ã10â12Ã[(25x)/(1+25x)]+1.93Ã10â12Ã[(1990x1)/(1+1990x1)] (R2=0.9763), where x and x1 denote the concentrations of HLoxalic and Loxalic, respectively, and x1=10â3.81Ãx/[H+]. For malic acid, the model was RSi=4.79Ã10â12Ã[(328x)/(1+328x)]+1.67Ã10â13Ã[(1149x1)/(1+1149x1)] (R2=0.9452), where x and x1 denote the concentrations of HLmalic and Lmalic, respectively, and x1=10â5.11Ãx/[H+], and for citric acid, the model was RSi=4.73Ã10â12Ã[(845x)/(1+845x)]+4.68Ã10â12Ã[(2855x1)/(1+2855x1)] (R2=0.9682), where x and x1 denote the concentrations of H2Lcitric and Lcitric, respectively, and x1=10â11.16Ãx/[H+]2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 290, Issue 2, 15 October 2005, Pages 481-488
Journal: Journal of Colloid and Interface Science - Volume 290, Issue 2, 15 October 2005, Pages 481-488
نویسندگان
Xingxiang Wang, Qingman Li, Huafeng Hu, Taolin Zhang, Yiyong Zhou,