Enhanced surface hydroxyl groups by using hydrogen peroxide on hollow tubular alumina for removing fluoride

Huang, Lei; Yang, Zhihui; Zhang, Zhuanxia; Jin, Linfeng; Yang, Weichun; He, Yingjie; Ren, Lili; Wang, Haiying

doi:10.1016/j.micromeso.2020.110051

Cited by 41 publications

(17 citation statements)

References 43 publications

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“…Similar results have been obtained in a H 2 O 2 -modified alumina adsorbent and an oxalic modified Ce–AlOOH adsorbent. 28 , 33 To further analyze the XPS results, the Al 2p and O 1s spectra are fitted by the Gaussian–Lorentzian function, and the fitting results are given in Figures 14 c,d and Table 4 . The Al 2p spectrum of AH-5 can be resolved to two peaks located at 74.1 and 74.6 eV, which are assigned to Al–O and Al–OH, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…27 Surface modification by H 2 O 2 can increase the surface hydroxyl groups of alumina, resulting in the enhancement of defluoridation capacity. 28 However, George et al demonstrated that the residual Al content after defluoridation by alumina was high, which cast a shadow on its wide application. 29 Besides alumina, aluminum hydroxide is also an effective defluoridation adsorbent, and its residual Al content after defluoridation is much lower than that of alumina.…”

Section: Introductionmentioning

confidence: 99%

“…The adsorption capacity of mesoporous alumina was increased from 24.45 to 37.35 mg/g by loading MgO on its surface . Surface modification by H 2 O 2 can increase the surface hydroxyl groups of alumina, resulting in the enhancement of defluoridation capacity . However, George et al demonstrated that the residual Al content after defluoridation by alumina was high, which cast a shadow on its wide application …”

Section: Introductionmentioning

confidence: 99%

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Separation of Excess Fluoride from Water Using Amorphous and Crystalline AlOOH Adsorbents

et al. 2021

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Aluminum hydroxide is an effective defluoridation adsorbent; however, the poor defluoridation performance limits its wide application. In this work, amorphous and crystalline AlOOH adsorbents are synthesized through hydrolysis of Al salts, and their defluoridation performances are evaluated in terms of adsorption capacity and rate, sensitivity to pH value, and water quality after defluoridation. The defluoridation performance of AlOOH is closely related to the hydrolysis pH value, but hardly to the type of Al salts. The adsorbent can remove >95% fluoride in the first 2 min and reach adsorption equilibrium within 2 h, and the maximum defluoridation capacity is 41.9 mg/g. Furthermore, the adsorbent exhibits an excellent defluoridation efficiency at a wide pH range of 4.5–10.5. After fluoride removal, the adsorbents prepared at pH values of 6 and 7 exhibit low residual Al concentration. The Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) results confirm that the fluoride removal mechanism is the ligand exchange between fluoride and hydroxyl groups. The excellent defluoridation capacity and low residual Al demonstrate that AlOOH is a potential adsorbent for fluoride separation from water.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Separation of Excess Fluoride from Water Using Amorphous and Crystalline AlOOH Adsorbents

et al. 2021

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“…Simultaneously, the surface of MnOOH-supported AA was covered by a certain amount of hydroxide radicals [28], thereby increasing the active sites for removing fluoride [29]. Since OH − and F − with a similar hydrate ionic radius can occur ionic coordination reaction in an acidic solution, fluoride was removed through the exchange of hydroxyl groups on the adsorbent surface [30]. The chemical reaction equations are shown as follows:…”

Section: Analysis Of Influential Factors and Regeneration Effectsmentioning

confidence: 99%

“…Simultaneously, the surface of MnOOH-sup ported AA was covered by a certain amount of hydroxide radicals [28], thereby increasin the active sites for removing fluoride [29]. Since OHand Fwith a similar hydrate ion radius can occur ionic coordination reaction in an acidic solution, fluoride was remove through the exchange of hydroxyl groups on the adsorbent surface [30] In addition, an underground hot spring water in Liaoning Province was used to in vestigate the fluoride removal performance. As can be seen in Table S1, under the cond tion of 5.6 mg/L of Fconcentration and 7 g/L of the adsorbent, the removal rates of AA and MnOOH-supported AA were 37.72% and 67.75%, respectively.…”

Section: Effect Of Ph On Fluoride Adsorptionmentioning

confidence: 99%

Fabrication of Manganese-Supported Activated Alumina Adsorbent for Defluoridation of Water: A Kinetics and Thermodynamics Study

You

et al. 2021

Water

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Fluoride pollution frequently occurs in many underground drinking water sources due to discrepancies in the geological environment. To address this problem, a manganese-supported activated alumina (MnOOH-supported AA) adsorbent was proposed in the present study. The adsorbent was prepared with an impregnation method, then the morphology and microstructure were systematically characterized. Further, the adsorption kinetics and thermodynamics were systematically explored through static experiments to confirm the adsorption mechanism. The results showed that MnOOH was successfully loaded on the activated alumina (AA), and irregular and convex spinous structures were formed on the surface of particles. Compared with the AA, MnOOH-supported AA exhibited a significantly higher defluoridation rate, which has been doubled. The kinetic behavior of fluoride adsorption on MnOOH-supported AA was governed by the quasi-second-order kinetics model with regression coefficients of 0.9862, 0.9978 and 0.9956, respectively. The adsorption rate was mainly ascribed to the intra-particle diffusion. Additionally, the Freundlich isotherm equation fitted the adsorption thermodynamic process reasonably well compared with the Langmuir adsorption model. Specifically, the correlation coefficients were 0.9614, 0.9383 and 0.9852 at 25 °C, 35 °C and 45 °C, respectively. The adsorption–desorption isotherm plot was similar to the Type V isotherm. The whole fluoride adsorption was a spontaneous endothermic reaction, and controlled by chemical adsorption. These results demonstrated that MnOOH-supported AA as an alternative to the conventional AA showed promising potential for defluoridation in drinking water treatment.

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Surface Modification for Dispersion Stability of Novel FAl2O3-POE Nanolubricant Using Functional SiO2

Nugroho

Mamat

Zhang

et al. 2022

Proceedings of the 2nd Energy Security and Chemical Engineering Congress

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Enhanced surface hydroxyl groups by using hydrogen peroxide on hollow tubular alumina for removing fluoride

Cited by 41 publications

References 43 publications

Separation of Excess Fluoride from Water Using Amorphous and Crystalline AlOOH Adsorbents

Separation of Excess Fluoride from Water Using Amorphous and Crystalline AlOOH Adsorbents

Fabrication of Manganese-Supported Activated Alumina Adsorbent for Defluoridation of Water: A Kinetics and Thermodynamics Study

Surface Modification for Dispersion Stability of Novel FAl2O3-POE Nanolubricant Using Functional SiO2

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