Removal of fluoride from wastewater solution using Ce-AlOOH with oxalic acid as modification

Wen, Tao; Zhong, Hong; Pan, Xiangbo; Wang, Peng; Wang, Haiying; Huang, Lei

doi:10.1016/j.jhazmat.2019.121373

Cited by 91 publications

(18 citation statements)

References 56 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%

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%

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

et al. 2021

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“…Fluoride is an essential element for the growth of the skeleton and teeth in the human body (Pillai et al 2020; Tao et al 2020). However, it can also cause various health problems, if used in excessive amounts.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and evaluation of Ca-doped ferrihydrite as a novel adsorbent for the efficient removal of fluoride

Ahmad

Shah

Ali

et al. 2021

Environ Sci Pollut Res

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In this work, a novel calcium (Ca) doped ferrihydrite adsorbent was evaluated for the enhanced adsorption of uoride (F) from the aqueous phase. The adsorbent properties, adsorption behavior, and mechanism were systematically evaluated. The synthesized adsorbent exhibited tremendous performance in a broad range of temperature and pH. Interestingly, the presence of co-existing anions such as NO 3 -, SO 4 2-, Cl -, and natural organic matter (NOM) have no considerable effect on the adsorption of uoride from water. The adsorption process was best tted to the pseudo-second order kinetic model and the Langmuir isotherm. The prepared adsorbent exhibited a maximum adsorption capacity of 53.21 mg/g for the uptake of uoride from water. The regeneration results con rmed that adsorbent could retain their original adsorption capacity after ve regeneration cycles. Results from the current study suggested that Ca-doped ferrihydrite has the application potential for the enhanced adsorption of uoride from the water phase.

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“…Fluoride is among the many vital trace elements required in drinking water within the allowable range (<1.5 mg/L) [ 1 ] for the normal growth of humans and animal bones. Nevertheless, it is detrimental to bone development when ingested beyond the acceptable concentration limit (>1.5 mg/L) [ 2 ]. Excess fluoride hurts bones because of its high electronegative value, enabling interrelations with calcium in bones.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Defluoridation of Water Using Zirconium—Coated Pumice in Fixed-Bed Adsorption Columns

2021

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Millions of people across the globe suffer from health issues related to high fluoride levels in drinking water. The purpose of this study was to test modified pumice as an adsorbent for the purification of fluoride-containing waters. The adsorption of fluoride onto zirconium-coated pumice (Zr–Pu) adsorbent was examined in fixed-bed adsorption columns. The coating of zirconium on the surface of VPum was revealed by X-ray diffractometer (XRD), Inductively coupled plasma-optical emission spectroscopy (ICP-EOS), and X-ray fluorescence (XRF) techniques. The degree of surface modification with the enhanced porosity of Zr–Pu was evident from the recorded scanning electron microscope (SEM) micrographs. The Brunauer-Emmett-Teller (BET) analysis confirmed the enhancement of the specific surface area of VPum after modification. The Fourier transform infrared (FTIR) examinations of VPum and Zr–Pu before and after adsorption did not reveal any significant spectrum changes. The pH drift method showed that VPum and Zr–Pu have positive charges at pHPZC lower than 7.3 and 6.5, respectively. Zr–Pu yielded a higher adsorption capacity of 225 mg/kg (2.05 times the adsorption capacity of VPum: 110 mg/kg), at pH = 2 and volumetric flow rate (QO) of 1.25 mL/min. Breakthrough time increases with decreasing pH and flow rate. The experimental adsorption data was well-matched by the Thomas and Adams-Bohart models with correlation coefficients (R2) of ≥ 0.980 (Zr–Pu) and ≥ 0.897 (VPum), confirming that both models are suitable tools to design fixed-bed column systems using volcanic rock materials. Overall, coating pumice with zirconium improved the defluoridation capacity of pumice; hence, a Zr–Pu-packed fixed-bed can be applied for defluoridation of excess fluoride from groundwater. However, additional investigations on, for instance, the influences of competing ions are advisable to draw explicit conclusions.

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Removal of fluoride from wastewater solution using Ce-AlOOH with oxalic acid as modification

Cited by 91 publications

References 56 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

Synthesis and evaluation of Ca-doped ferrihydrite as a novel adsorbent for the efficient removal of fluoride

Enhanced Defluoridation of Water Using Zirconium—Coated Pumice in Fixed-Bed Adsorption Columns

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