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| 標題: | Removal of nickel ions from aqueous solutions by manganese dioxide derived from groundwater treatment sludge |
| 作者: | Ong, Dennis C.
Pingul-Ong, Sheila Mae B.
Kan, Chi-Chuan
de Luna, Mark Daniel G. |
| 貢獻者: | Univ Philippines Visayas, Sch Technol
Univ Philippines, Natl Grad Sch Engn, Environm Engn Program
Chia Nan Univ Pharm & Sci, Inst Hot Spring Ind
Univ Philippines, Dept Chem Engn |
| 關鍵字: | Adsorption
Groundwater treatment sludge
Heavy metals
Isotherm adsorption models
Wastewater treatment |
| 日期: | 2018-07-20 |
| 上傳時間: | 2019-11-15 15:44:22 (UTC+8) |
| 出版者: | ELSEVIER SCI LTD |
| 摘要: | In this study, manganese dioxide (MnO2) derived from groundwater treatment sludge was used in the adsorption of nickel (Ni(II)) ions from aqueous solutions. The synthetic MnO2 was prepared via permanganate reduction using manganese extracted from the sludge by reductive acid leaching and hydroxide precipitation. Scanning electron microscopy images showed aggregated micron-sized MnO2 particles. Fourier transform infrared analysis of MnO2 revealed functional groups at 3,396 cm(-1), 1,630 cm(-1), 1,427 cm(-1) and 468 cm(-1) bands. Zeta potential measurements at the pH range of 2-8 confirmed the net negative surface charge of MnO2 particles. Moreover, Ni(II) adsorption by MnO2 was best described by the Langmuir isotherm model, as indicated by the high values for the coefficients of determination (R-2 > 0.9703). The separation factor (RL) for the range of pH values and initial Ni(II) concentrations considered in this study indicated that Ni(II) adsorption by MnO2 was favorable. The kinetic data of Ni(II) adsorption by MnO2 at pH 6.5 and initial Ni(II) concentrations from 10 to 200 mg L-1 conformed to the pseudo-second order adsorption kinetic model, with R-2 > 0.9997. Chemisorption occurred through the complexation of Ni(II) ions with available MnO2 functional groups. The thermodynamic study at temperatures of 298.15, 308.15 and 318.15 K revealed that Ni(ll) adsorption by MnO2 was spontaneous and thermodynamically favorable for initial Ni(II) concentrations ranging from 50 to 200 mg L-1. Overall, Ni(II) adsorption by MnO2 was endothermic, as indicated by the positive LW values. In addition, MnO2 had good affinity towards the Ni(II) ions, as shown by the positive AS values at all Ni(II) concentrations. Simple cost analysis revealed that the MnO2 production from groundwater sludge was economically viable and may be scaled up for commercial applications. (C) 2018 Elsevier Ltd. All rights reserved. |
| link: | http://dx.doi.org/10.1016/j.jclepro.2018.04.175 |
| 關聯: | Journal of Cleaner Production, v.190, pp.443-451 |
| 顯示於類別: | [觀光事業管理系(含溫泉所)] 期刊論文
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