Adsorption of Ni(II) using amine-functionalized MCM-41 optimized by response surface methodology. Issue 18 (14th April 2016)

• Record Type: Journal Article
• Authors: Yang, Shengxin; Wu, Yunhai; Aierken, Ayinigaer; Zhang, Meili; Wu, Yunying
• Is Part Of: Desalination and water treatment. Volume 57:Issue 18(2016)
• Page Start: 8526
• Page End: 8539
• Publication Date: 2016-04-14
• Subjects: Ni(II) -- NH2-MCM-41 -- Response surface methodology -- Kinetic -- Isotherm; Saline water conversion -- Periodicals; Saline water conversion; Water -- Purification; Periodicals; 628.167
• DOI: 10.1080/19443994.2015.1017743
• Languages: English
• ISSNs: 1944-3994

Abstract

Abstract: Adsorption of Ni(II) by amine-functionalized MCM-41 (NH2 -MCM-41) was studied with response surface methodology (RSM) employed to optimize the adsorption process. The independent variables include pH, metal concentration, temperature, and adsorbent dosage. Analysis of variance (ANOVA) of RSM indicated that the obtained second-order polynomial model was appropriate to predict the adsorption process. Meanwhile, the maximum removal efficiency for Ni(II) was 93.20%, which was achieved at pH 6.50, metal concentration 10.00 mg/L, temperature 35°C, and adsorbent dosage 5.00 g/L. The kinetic study revealed that the pseudo-second-order kinetic model could describe the experimental data better. While the intraparticle diffusion model suggested three stages of the adsorption process. In addition, the adsorption data conformed well to Langmuir isotherm model. Thermodynamic study implied the adsorption process was spontaneous and endothermic. The adsorption–desorption experiment showed that NH2 -MCM-41 held good reusability.