The behavior of phosphate adsorption and its reactions on the surfaces of Fe–Mn oxide adsorbent

Du, Xiaoli; Han, Qing; Li, Junqi; Li, Haiyan

doi:10.1016/j.jtice.2017.04.023

Cited by 109 publications

(26 citation statements)

References 35 publications

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“…This phenomenon also demonstrates that ligand exchange reaction and ion exchange were the main mechanisms of phosphate uptake onto ZFCL. For metal oxide adsorbents, NaOH solution was often efficient for phosphate desorption . The facts suggest that the active adsorption sites were recreated under alkaline condition .…”

Section: Resultsmentioning

confidence: 94%

Phosphate uptake behavior and mechanism analysis of facilely synthesized nanocrystalline Zn‐Fe layered double hydroxide with chloride intercalation

Yang

Liu

Lǚ

et al. 2018

Surface & Interface Analysis

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Zn-Fe layered double hydroxide with chloride intercalation (ZFCL) was synthesized by a coprecipitation method at room temperature. ZFCL was characterized by N 2 adsorptiondesorption isotherms, X-ray diffraction, scanning electron microscope, Zeta-sizer analyzer, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The results showed that ZFCL had large surface area and layered structure. The maximum adsorption capacity of ZFCL was 150.6 mg/g at 25°C. That was higher than most other adsorbent which were reported. The kinetic data were described better by the pseudo-second-order adsorption kinetic rate model. The adsorption isotherm on the adsorbent was described by Langmuir, Freundlich, and Sips models at pH 6 and followed the fitting order: Sips >Freundlich>Langmuir. Thermodynamic analyses indicated that the phosphate adsorption on ZFCL was endothermic and spontaneous in nature. The sequence of coexisting cations and anions competing with phosphate was Ca 2+ > Mg 2+ > Na + and SO 4 2− > NO 3 − > Cl − . ZFCL can be regenerated by the sequential use of NaOH and ZnCl 2 . The adsorption capacity remained high as 108.6 mg/g after regeneration of 3 times. The results of zeta potential, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy analyses indicated that the phosphate adsorption mechanisms involved ion exchange, Zn 3 (PO 4 ) 2 precipitation, and the formation of inner-sphere complex via replacement of surface hydroxyl groups by phosphate.

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Section: Resultsmentioning

confidence: 94%

Phosphate uptake behavior and mechanism analysis of facilely synthesized nanocrystalline Zn‐Fe layered double hydroxide with chloride intercalation

Yang

Liu

Lǚ

et al. 2018

Surface & Interface Analysis

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“…pH can influence ammonium adsorption in three ways: (a) affecting the charge and adsorption sites on the adsorbents surface (Crini & Badot, ); (b) protonating the surface of materials (Du et al, ; Li, Li, Zhang, Wang, & Zheng, ); and (c) through the reversibility of the reaction (Widiastuti, Wu, Ang, & Zhang, ):

{NH}_{4}^{+} + {OH}^{-} ⇌ {NH}_{3} + {normalH}_{2} O

…”

Section: Resultsmentioning

confidence: 99%

“…Among them, Fe–Mn binary oxide (FMBO) demonstrated outstanding adsorption abilities, due to its high specific surface area and functional groups, which can react with specifically ions (Awual, ; Luo, Tian, Yang, Zhang, & Yan, ; Zhang, Qu, Liu, Liu, & Wu, ). FMBO has been used to treat various contaminants, including dyes (Khan, Khan, & Shahjahan., ), arsenite (Cui et al, ; Zhang et al, ), phosphate (Du, Han, Li, & Li, ; Lu, Liu, et al, ), and metals (Li, Chen, Yu, & He, ; Lu, Huangfu, & Ma, ). However, there is little literature focusing on the adsorption of ammonium by FMBO.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a novel Fe–Mn binary oxide‐modified lava adsorbent and its effect on ammonium removal from aqueous solutions

Zhao

et al. 2019

Water Environment Research

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Ammonium is strongly related to eutrophication and a key control of eutrophication in aquatic systems, especially in agricultural runoff. In this study, a novel Fe-Mn binary oxide-modified lava (FMML) granular adsorbent was synthesized for ammonium removal from aqueous solutions by co-precipitation method. The kinetic data were described by pseudo-second-order kinetic model well and intraparticle diffusion had effects on ammonium adsorption. For pH between 4.0 and 10.0, the adsorption efficiency was >80%, and its optimum was recorded at pH 7.0. FMML exhibited strong ammonium adsorption selectivity under the single presence of cations like Na + , K + , Ca 2+ , and Mg 2+ . The optimum adsorbent dose and particle size were 4 g/L and 3-5 mm, respectively, for an aqueous solution containing 10 mg/L of ammonium under normal conditions (298 K and pH 7.0). Furthermore, the adsorption process was endothermic, following both the Langmuir (R 2 > 0.98) and Freundlich (R 2 > 0.96) models. Compared with other adsorbents, the FMML can be prepared following a simpler protocol. After 30 times of adsorption-regeneration cycle, the FMML also had a relatively high ammonium adsorption capacity; hence, we see it as a prospective adsorbent for ammonium adsorption from aqueous solutions. © 2019 Water Environment Federation • Practitioner points• Fe-Mn binary oxide-modified lava with Fe/Mn ratio 3:1 was prepared using co-precipitation method. • Adsorption maximum of modified lava was 20.8 mg/g (298 K and pH 7.0). • Adsorption was sensitive to changes in adsorbent dose, particle size, and pH. • Inorganic cations decreased ammonium adsorption in order of Na + > K + > Ca 2+ > Mg 2+ . • Mechanisms for ammonium removal by FMML include diffusion, electrostatic attraction, oxidation, and complexation reaction.

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“…The adsorption of Cr(VI) on the GFMO mainly occurs through anion exchange, surface complexation, and electrostatic attraction. Due to the high adsorption capability, good stability and easy separation process, GFMO has a promising potential for applications as fillers in filters, bioretentions, and constructed wetlands for Cr(VI) removal in wastewaters, runoffs and polluted surface water .…”

Section: Discussionmentioning

confidence: 99%

Cr(VI) adsorption from aqueous solution and its reactions behavior on the surfaces of granular Fe–Mn binary oxides

Zhu

2018

Env Prog and Sustain Energy

Self Cite

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A granular Fe–Mn binary oxide (GFMO) was prepared for Cr(VI) removal and characterized by its Brunauer–Emmett–Teller surface area, scanning electron microscopy, X‐ray photoelectron spectroscopy, X‐ray diffraction, and Fourier transform infrared spectroscopy. Scanning electron microscopy images of the GFMO showed it had a rough surface and heterogeneous porous structure. The Brunauer–Emmett–Teller surface area was 57.64 m2/g. X‐ray photoelectron spectra showed that manganese and iron existed mainly in the +IV and + III oxidation states, respectively. Adsorption of Cr(VI) by the GFMO was investigated. Kinetic data showed that the Cr(VI) adsorption onto the GFMO followed a pseudo‐second‐order model, indicating that the adsorption process was chemisorption. Equilibrium data were analyzed by both the Freundlich and Langmuir models, and the Langmuir isotherm model fitted better with the maximum adsorption capacity of 16.79 mg/g at 318 K. The Cr(VI) adsorption on GFMO was endothermic and nonspontaneous in nature. It was also strongly pH dependent, with higher Cr(VI) removal efficiency occurring under acidic conditions and a sharp decrease in adsorption as the pH increased. Coexisting anions competed with Cr(VI) for adsorption on the GFMO in the order silicate > sulfate > nitrate. Cr(VI) adsorption on the GFMO mainly occurred via anion exchange, surface complexation, and electrostatic attraction. Novelty or Significance: Combined adsorbent with iron oxides and manganese oxides was usually synthesized for heavy metal removal and showed an excellent adsorption capacity. However, the Fe–Mn binary oxide adsorbent mentioned above were mostly exhibited in particles, limiting its engineering application due to the dispersion state in aqueous solutions. Therefore, novel granular Fe–Mn oxide adsorbents, with good stability and high adsorption capacity, are highly desired. A novel granular Fe–Mn oxide (GFMO) adsorbent with the polyvinyl alcohol (PVA) as the adhesive was synthesized to investigate its adsorption behaviors for Cr(VI) for further used as filler in most water treatment equipment. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S176–S184, 2019

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The behavior of phosphate adsorption and its reactions on the surfaces of Fe–Mn oxide adsorbent

Cited by 109 publications

References 35 publications

Phosphate uptake behavior and mechanism analysis of facilely synthesized nanocrystalline Zn‐Fe layered double hydroxide with chloride intercalation

Phosphate uptake behavior and mechanism analysis of facilely synthesized nanocrystalline Zn‐Fe layered double hydroxide with chloride intercalation

Synthesis of a novel Fe–Mn binary oxide‐modified lava adsorbent and its effect on ammonium removal from aqueous solutions

Cr(VI) adsorption from aqueous solution and its reactions behavior on the surfaces of granular Fe–Mn binary oxides

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