Enhanced removal of triphosphate by MgCaFe-Cl-LDH: Synergism of precipitation with intercalation and surface uptake

Zhou, Jizhi; Xu, Zhi Ping; Qiao, Shi Zhang; Liu, Qiang; Xu, Yunfeng; Qian, Guangren

doi:10.1016/j.jhazmat.2011.02.078

Cited by 82 publications

(27 citation statements)

References 30 publications

(47 reference statements)

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“…The dissolution phenomenon of the LDHs is responsible for the lost of the layered structure after phosphate uptake ( Figure 20). These findings are in conformity with the removal of Ca-based LDHs for removing different P species in other previous studies [11,[25][26][27][28]. These findings reveal that the dual combinations of ion exchange and precipitation were the mechanisms of phosphate removal by the LDH sample.…”

Section: Characterisation Of Phosphate -Laden Ldhsupporting

confidence: 92%

Evaluation of Layered Double Hydroxide Synthesised from a Green Biogenic Precursor for Phosphate Removal: Characterisations and Isotherms

Adelagun¹

2017

AJBIO

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CaCr LDH materials were synthesized by the co-precipitation method, using Gastropod shell as a biogenic source of Ca 2+. The mineralogical, surficial morphology and elemental composition analysis of the materials showed characteristics typical of hydrotalcite-like materials, composed of Ca, Cr, O, C and Cl. Batch equilibrium adsorption studies showed that phosphate sorption on the LDH reached equilibrium within 5 min with about 98% removal. The sorption of phosphate was well described by the Langmuir isotherm model. The monolayer adsorption capacity of the CaCr LDH for phosphate was 142.86 mg/g. Mechanistic studies of phosphate removal by the LDHs was elucidated via instrumental analysis, vis-a viz, SEM-EDX, XRD and FTIR. Results revealed that phosphate was removed via the combination of ion exchange and precipitation. It could be inferred that CaCr LDH synthesised using Gastropod shell as a biogenic source of Ca 2+ is a suitable adsorbent for phosphate removal from aqua system.

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Section: Characterisation Of Phosphate -Laden Ldhsupporting

confidence: 92%

Evaluation of Layered Double Hydroxide Synthesised from a Green Biogenic Precursor for Phosphate Removal: Characterisations and Isotherms

Adelagun¹

2017

AJBIO

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“…These results were consistent with our previous work on phosphate removal by ternary LDHs and suggested that the Mg-LDH framework in solution was highly stable. 17 Accordingly, As(III) removal can occur both via adsorption on the LDH structure and via precipitation with the Ca released from the ternary LDHs.…”

Section: Characterization Of Solid Samples Before and Aer As(iii) Rementioning

confidence: 99%

“…Based on this feature, LDHs have already been proven more efficient for the removal of various oxyanions, including phosphate, chromate, selenite and arsenate, than Fe oxides or hydroxides. [16][17][18] Since As(III) shares a similar microstructure with the abovementioned oxyanions, LDHs could be potential candidates for As(III) immobilization.…”

Section: Introductionmentioning

confidence: 99%

“…The results demonstrated that the release of Ca from the LDH matrix was responsible for the precipitation of anions, while anion exchange on the resultant Mg-rich LDH framework contributed to the immobilization of anions. 17,19 Since the precipitation of As(III) with Ca was also veried in solution, 20,21 it was suggested that As(III) may be immobilized more effectively by the Ca/Mg ternary LDH than by the binary system from both capillary water and soil. To the best of our knowledge, the application of ternary LDH systems for As(III) immobilization from paddy soils has not been reported.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced arsenite immobilization via ternary layered double hydroxides and application to paddy soil remediation

et al. 2017

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A ternary CaMgFe-LDH was developed for the immobilization of aqueous arsenic from capillary water in paddy soils, with an outstanding removal performance for aqueous arsenite (As(III)). In an As(III) solution, the ternary LDH achieved a removal capacity for arsenite of approximately 16 mg g À1 after 5 h, with a low equilibrium concentration of As(III) (0.048 mg L À1). The As(III) removal capacity of LDH was studied with the different Ca/Mg molar ratios in LDH, which demonstrated that ternary LDHs with a higher Ca content can remove As(III) more effectively and rapidly. Accordingly, the ternary LDH material was used in the immobilization of total arsenic from a paddy soil system, achieving a removal efficiency for As(III) of 47% and a total As concentration of 346 mg L À1 in capillary water after 40 days. Compared to that of the binary Mg-Fe LDH, the As removal performance of the ternary LDH was higher, which was attributed to the As precipitation with Ca in the first 20 days during the experiment. This, along with the efficient adsorption of As on the residual Mg-Fe-LDH framework, was responsible for the low concentration of As. Therefore, our study proposes a promising approach to the remediation of arsenic-contaminated paddy soils.

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“…The observed lattice parameters (a and c) are similar to that reported elsewhere. 120 Ca n Fe-LDH has lattice parameter a of ~0.58 nm due to the seven-coordination structure of Ca(II). 121 The FWHM of (hk0) was determined to be higher in MgFe-than in CaFe-LDHs showing the better crystalinity of CaFe-LDHs.…”

Section: Scherrer Equationmentioning

confidence: 99%

Functional Materials - Syntheses, Characterisation and Catalytic Applications

Sipiczki¹

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Enhanced removal of triphosphate by MgCaFe-Cl-LDH: Synergism of precipitation with intercalation and surface uptake

Cited by 82 publications

References 30 publications

Evaluation of Layered Double Hydroxide Synthesised from a Green Biogenic Precursor for Phosphate Removal: Characterisations and Isotherms

Evaluation of Layered Double Hydroxide Synthesised from a Green Biogenic Precursor for Phosphate Removal: Characterisations and Isotherms

Enhanced arsenite immobilization via ternary layered double hydroxides and application to paddy soil remediation

Functional Materials - Syntheses, Characterisation and Catalytic Applications

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