A novel acid modified alumina adsorbent with enhanced defluoridation property: Kinetics, isotherm study and applicability on industrial wastewater

Kumari, Usha; Behera, Sushanta K.; Meikap, B.C.

doi:10.1016/j.jhazmat.2018.11.064

Cited by 119 publications

(48 citation statements)

References 60 publications

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“…The regeneration study shows that the alkaline environment can regenerate the discharged metal oxide adsorbent [46]. The literature includes numerous studies on the removal of fluoride by various adsorbents, but studies of the reuse of metal oxides as sorbents are rare.…”

Section: Resultsmentioning

confidence: 99%

Mg-Al Mixed Oxide Adsorbent Synthesized Using FCT Template for Fluoride Removal from Drinking Water

Liu

Zhao

et al. 2019

Bioinorganic Chemistry and Applications

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To make full use of natural waste, a novel Mg-Al mixed oxide adsorbent was synthesized by the dip-calcination method using the fluff of the chinar tree (FCT) and an Mg(II) and Al(III) chloride solution as raw materials. The adsorbents were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The effects of the Mg/Al molar ratio and calcination temperature on the performance of the novel Mg-Al mixed oxide adsorbent were investigated. The optimized Mg-Al mixed oxide adsorbent had a Langmuir adsorption capacity of 53 mg/g. This adsorption capacity was higher than that of the separate Mg oxide and Al oxide. The synergy between Mg and Al is beneficial to the adsorption performance of the material. The fluoride adsorption capacity of the optimized Mg-Al mixed oxide adsorbent is only slightly affected by ions such as Cl−, NO3−, SO42−, Na+, and K+ and is excellent for use in recycling and real water. The hydroxyl groups on the surface of the Mg-Al mixed oxide adsorbent play a key role in the adsorption of fluorine. The as-obtained novel Mg-Al mixed oxide adsorbent is an efficient and environmentally friendly agent for fluoride removal from drinking water.

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Section: Resultsmentioning

confidence: 99%

Mg-Al Mixed Oxide Adsorbent Synthesized Using FCT Template for Fluoride Removal from Drinking Water

Liu

Zhao

et al. 2019

Bioinorganic Chemistry and Applications

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“…Additionally, the new peaks are emerged at few wavelengths (450 and 600 cm -1 ) after fluoride adsorption. The fresh WGB showed peaks at 2,360, 1,635.64 and 1,064.71 cm -1 due to O-H bending vibration [19].…”

Section: Ft-ir Analysismentioning

confidence: 99%

“…The surface adsorption maintains a great place in the research and practice of defluoridation because of its general approachability and feasibility. A wide range of materials were utilized for fluoride adsorption including lime followed by zirconium as a polishing step [11], red mud [12], amended clay [13] activated alumina, alum, and brick powder [14][15][16], hydrous iron III0-tin (IV) bimetal mixed oxide [5], modified bentonite clay [17], polymer/biopolymer composites [6], acidic alumina [18,19], wheat dust, sawdust, and activated bagasse carbon of sugarcane [20], bone char [21], alum impregnated brick powder [22], citrus limonum leaf [23], raw unmodified bones [24], calcite nanoparticles [25], bio-adsorbent [26][27], laterite soil based adsorbents [28], neem oil-phenolic resin treated plant bio-sorbent [29], calcium carbonate [30][31], layered ZSM-5 zeolite [32], Ni and Zn modified LD slag based geopolymer [33]. In general, the majority of these adsorbent materials were used in batch mode experiments, while its column run was seldom studied.…”

Section: Introductionmentioning

confidence: 99%

Experimental and modeling study of water defluoridation using waste granular brick in a continuous up-flow fixed bed

Ali

Ismail

2020

Environmental Engineering Research

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Contamination of surface and groundwater with excessive concentrations of fluoride is of significant health hazard. Adsorption of fluoride onto waste materials of no economic value could be a potential approach for the treatment of fluoride-bearing water. This experimental and modeling study was devoted to investigate for the first the fluoride removal using unmodified waste granular brick (WGB) in a fixed bed running in continuous mode. Characterization of WGB was carried out by FT-IR, SEM, and EDX analysis. The batch mode experiments showed that they were affected by several parameters including contact time, initial pH, and sorbent dosage. The best values of these parameters that provided maximum removal percent (82%) with the initial concentration of F-1 ions (10 mg/L) and agitation speed (200 rpm) were 90 min, 8, and 3 g/100 mL, respectively. The experimental data were found to fit the Freundlich isotherm model. The maximum adsorption capacity of fluoride on WGB was 1.1 mg/g. The continuous mode experiments clearly confirmed the important role of WGB bed in hindering and confining the propagation of the fluoride-loaded plume as well as there was a very good matching (RMSE ≤ 0.0398) with the predicted results obtained by the simulated mathematical model using COMSOL Multiphysics 3.5a software.

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“…However, its adsorption capacity is not always satisfactory, mainly due to the small specific surface area. For this reason, the modification of its surface, by molecules having higher fluoride adsorption, has recently been investigated 63 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of aluminum-based adsorbent and application in fluoride removal from aqueous solution

2020

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A novel adsorbent was obtained by a facile precipitation method and was used for fluoride removal from aqueous solution. Mineralogical and physicochemical characterization of the adsorbent was carried out by X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), Energy Dispersive X-Ray attached to Scanning Electron Microscopy (SEM-EDX), BET Specific Surface Area(SSAN2BET) analysis and Fourier-Transform Infrared Spectrometry (FTIR). The effect of various operational parameters such as contact time, initial fluoride concentration, (20-160 mg L-1) adsorbent dose (1-6 g L-1) and initial pH solution (3-11) was evaluated in batch procedures at room temperature (25±2°C). The results of the batch adsorption experiments proved that 24 h of contact time was sufficient for attaining equilibrium. The maximum wastewater defluoridation (84.91%) was obtained for 40 mg L-1 and 3 g L-1 of initial fluoride concentration and adsorbent dose, respectively. It appears that there was no significant effect on the F- removal over a wide range of pH 3-11. Kinetic studies revealed that fluoride adsorption fitted well to pseudo-second-order. The adsorption isotherm of fluoride sorption indicated that the maximum adsorption capacity was noted to be 43.29 mg g-1. Batch adsorption data was better described by Langmuir isotherm confirming monolayer adsorption with homogenous distribution of active sites and without interaction between adsorbed molecules. The obtained results indicated that the ion exchange is probably the main mechanism involved in the F- adsorption by the aluminium-based adsorbent.

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A novel acid modified alumina adsorbent with enhanced defluoridation property: Kinetics, isotherm study and applicability on industrial wastewater

Cited by 119 publications

References 60 publications

Mg-Al Mixed Oxide Adsorbent Synthesized Using FCT Template for Fluoride Removal from Drinking Water

Mg-Al Mixed Oxide Adsorbent Synthesized Using FCT Template for Fluoride Removal from Drinking Water

Experimental and modeling study of water defluoridation using waste granular brick in a continuous up-flow fixed bed

Synthesis and characterization of aluminum-based adsorbent and application in fluoride removal from aqueous solution

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