Enhanced adsorption of bromate from aqueous solutions on ordered mesoporous Mg-Al layered double hydroxides (LDHs)

Ji, Huashun; Wu, Wenhao; Li, Feihu; Yu, Xiaoxue; Fu, Jingjing; Jia, Lijuan

doi:10.1016/j.jhazmat.2017.04.014

Cited by 120 publications

(37 citation statements)

References 43 publications

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“…It indicated the multilayered physical adsorption of N 2 was taking place between the aggregates of platelets . These were also in accordance with other reports . PCL also exhibited a H3 type demonstrating no change of structure after adsorption.…”

Section: Resultsmentioning

confidence: 74%

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: 74%

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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“…The As(V) concentration was determined by hydride generation–atomic fluorescence spectrometry (HG‐AFS, Skyray, AFS200, Kunshan, China). The F − concentration was measured by ionic chromatography (ICS‐2000, Dionex, Sunnyvale, CA, USA) . The solution pH values were measured on a Sartorius pH meter (PB‐10) calibrated with standard pH 4.00, 7.00 and 10.01 buffers (Thermo, Waltham, MA, USA).…”

Section: Methodsmentioning

confidence: 99%

“…The competitive effects of co‐anions including Cl − , NO 3 − , SO 4 2− , CO 3 2− , and PO 4 3− , were also investigated individually following a well‐defined method . The initial concentration of these anions was set to the same as those of arsenate and fluoride anions (10 mmol L ‐1 ), e.g., the molar ratio of As(V): F − : Cl − was 1:1:1 in the case of using Cl − as a competitive anion.…”

Section: Methodsmentioning

confidence: 99%

Evaporation‐induced self‐assembly (EISA) synthesized mesoporous bimetallic oxides (MBOs) enabling enhanced co‐uptake of arsenate and fluoride from water

Jin

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND: Simultaneous removal of arsenic and fluoride anions from water by adsorption remains a challenge for environmental remediation practice. To address this issue, four mesoporous bimetallic oxides (MBOs) were prepared via the evaporation-induced self-assembly (EISA) method and studied as adsorbents for the co-uptake of arsenate (As(V)) and fluoride (F − ) from synthetic wastewater. Adsorption envelope and equilibrium experiments were performed to investigate the adsorption behaviors and properties.RESULTS: These composites possessed high surface areas (e.g. 200 m 2 g −1 for meso-Ti/Al) and well-defined mesopores, enabling high adsorption capacities for both As(V) and F − . The maximum adsorption capacities of mesoporous titanium-lanthanum oxide (meso-Ti/La) were as high as 81.42 mg g −1 and 44.37 mg g −1 for As(V) and F − , respectively. Surface complexation modeling indicates that As(V) removal mainly involved bidentate surface complexation with surface ≡Me-OH, while F − was retained by formation of monodentate surface complexes. CONCLUSION: The removal mechanisms were confirmed by X-ray photoelectron spectroscopy. These MBOs were found to be effective for simultaneous removal of arsenic and fluoride from water. This study also demonstrated that the incorporation of multi-components and mesoporosity into one composite is an efficient strategy for design and application of high-efficiency adsorbents for environmental remediation of aqueous contaminants.

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“…-MoO 4 2was prepared and used as a photocatalyst for oxidation decomposition of BT. Hydrotalcite is one of the new types of catalytic materials which have been studied in recent years (Taylor 1973;Zhang and Guo 2016;Ji and Wu 2017;Huang et al 2017;Li and Wei 2015;Fan and Yang 2013). However, few people studied the desulfurization treatment of diesel with hydrotalcite catalysts.…”

Section: Introductionmentioning

confidence: 99%

Degradation of benzothiophene in diesel oil by LaZnAl layered double hydroxide: photocatalytic performance and mechanism

Gao

Song

et al. 2018

Pet. Sci.

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A new type of photocatalytic La 3?-Zn 2?-Al 3?-MoO 4 2layered double hydroxide (LDH) material (molar ratio, La/Zn/ Al = 1:7:2) was prepared by a complexing agent-assisted homogeneous precipitation technique. The structure of the prepared LDH material was systematically studied. Under UV irradiation, the desulfurization efficiency of the LDH material was 87% in 2 h. For La 3?-Zn 2?-Al 3?-MoO 4 2-LDH material, the introduction of MoO 4 2increased the interlayer space for promoting the adsorption of benzothiophene (BT), and MoO 4 2might provide active sites for the oxidation of BT, resulting in the high desulfurization efficiency.

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Enhanced adsorption of bromate from aqueous solutions on ordered mesoporous Mg-Al layered double hydroxides (LDHs)

Cited by 120 publications

References 43 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

Evaporation‐induced self‐assembly (EISA) synthesized mesoporous bimetallic oxides (MBOs) enabling enhanced co‐uptake of arsenate and fluoride from water

Degradation of benzothiophene in diesel oil by LaZnAl layered double hydroxide: photocatalytic performance and mechanism

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