High-efficient adsorption of phosphates from water by hierarchical CuAl/biomass carbon fiber layered double hydroxide

Hu, Fengping; Wang, Min; Peng, Xiaoming; Qiu, Fengxian; Zhang, Tao; Hirata, Dai; Liu, Zhanmeng; Cao, Zan

doi:10.1016/j.colsurfa.2018.07.010

Cited by 67 publications

(25 citation statements)

References 53 publications

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“…A significant decrease in the intensity of NO 3 − is attributed to the contribution of the anion exchange mechanism between interlayered NO 3 − with phosphate and nitrate species. Similar behavior was reported by Hu et al [ 38 ] after phosphate removal by CuAl/biochar. The formation of a broad peak at 1050 cm −1 could be assigned to P-O stretching vibrations, suggesting that -OH groups are replaced by the adsorbed phosphate and nitrate [ 22 , 51 , 56 , 57 , 58 ].…”

Section: Resultssupporting

confidence: 90%

“…It can be inferred from Figure 4 that the SBAC 100 MgFe composite provided better removal rates for phosphate and nitrate as the pH 0 < pHpzc = 7.54. Under acidic conditions, the present forms of phosphate (HPO 4 2− and H 2 PO 4 − ) and nitrate (NO 3 − ) in the solution electrostatically interact with the positively charged surface of SBAC 100 MgFe, resulting in better removal rates and adsorption capacities for both anions by the SBAC 100 MgFe composite [ 38 , 39 ]. The removal performance of phosphate and nitrate by the SBAC-MgFe composite is observed to be better at pH 0 = 8 < pHpzc.…”

Section: Resultsmentioning

confidence: 99%

“…The removal performance of phosphate and nitrate by the SBAC-MgFe composite is observed to be better at pH 0 = 8 < pHpzc. At pH 0 = 2–8, phosphate and nitrate species had lower adsorption free energy and could easily interact with the composite surface, forming metal–ligand complexes [ 38 ]. On the contrary, the SBAC 100 MgFe composite indicated a decreased removal efficiency when pH 0 > 8.…”

Section: Resultsmentioning

confidence: 99%

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Magnetic Mg-Fe/LDH Intercalated Activated Carbon Composites for Nitrate and Phosphate Removal from Wastewater: Insight into Behavior and Mechanisms

et al. 2020

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This experimental work focused on the synthesis, characterization, and testing of a unique, magnetically separable, and eco-friendly adsorbent composite material for the advanced treatment and efficient removal of nitrate and phosphate pollutants from wastewater. The MgAl-augmented double-layered hydroxide (Mg-Fe/LDH) intercalated with sludge-based activated carbon (SBAC-MgFe) composites were characterized by FT-IR, XRD, BET, VSM, SEM, and TEM techniques, revealing homogeneous and efficient dispersion of MgFe/LDH within the activated carbon (AC) matrix, a highly mesoporous structure, and superparamagnetic characteristics. The initial solution pH, adsorbent dose, contact time, and temperature parameters were optimized in order to reach the best removal performance for both pollutants. The maximum adsorption capacities of phosphate and nitrate were found to be 110 and 54.5 mg/g, respectively. The competition between phosphate and coexisting ions (Cl−, CO32−, and SO42−) was studied and found to be remarkably lower in comparison with the nitrate adsorption. The adsorption mechanisms were elucidated by kinetic, isotherm, thermodynamic modeling, and post-adsorption characterizations of the composite. Modeling and mechanistic studies demonstrated that physisorption processes such as electrostatic attraction and ion exchange mainly governed the nitrate and phosphate adsorption. The composite indicated an outstanding regeneration performance even after five sequences of adsorption/desorption cycles. The fabricated composite with magnetically separable characteristics can be used as a promising adsorbent for the removal of phosphate and nitrate pollutants from wastewater.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Magnetic Mg-Fe/LDH Intercalated Activated Carbon Composites for Nitrate and Phosphate Removal from Wastewater: Insight into Behavior and Mechanisms

et al. 2020

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“…These anions had an insignicant effect on the phosphate adsorption process because of the strong and stable interactions between the LDH and phosphate, including electrostatic attraction, anion exchange, and the formation of innersphere complexes with metal hydroxides. 34,35 Compared with Cl À , NO 3…”

mentioning

confidence: 99%

Synthesis of a novel magnetic Caragana korshinskii biochar/Mg–Al layered double hydroxide composite and its strong adsorption of phosphate in aqueous solutions

et al. 2019

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“…Although calcium superphosphate is produced from rock phosphorus with sulfuric acid as a low-cost phosphorus nutrient for crops, the rock phosphorus output has been decreasing year by year [13]. To solve these problems, adsorption method has been studied in order to remove P from environmental water and recycle as a nutrient [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Phosphate ion adsorption properties of PAN-based activated carbon fibers prepared with K2CO3 activation

2020

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Adsorbents for phosphate ion removal were prepared with K 2 CO 3 activation and heat treatment at 950 °C from polyacrylonitrile-based carbon fiber (PAN-CF). Comparative tests for specific surface area and pore structures, elemental and nitrogen species analysis, and phosphate ion adsorption experiments demonstrated that K(3)-Δ, which was activated with K 2 CO 3 /PAN-CF weight ratio of 3 and then treated at 950 °C, exhibited larger amount of quaternized-nitrogen (0.46 wt%) and equilibrium adsorption amount (0.23 mmol/g) among the prepared adsorbents. The experimental data for phosphate adsorption of K(3)-Δ was well fitted to Langmuir adsorption isotherms and pseudo-second-order kinetic model. As for regeneration performance, K(3)-Δ still remained more than 60% adsorption amount of the fresh adsorbent after rejuvenation treatment.

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High-efficient adsorption of phosphates from water by hierarchical CuAl/biomass carbon fiber layered double hydroxide

Cited by 67 publications

References 53 publications

Magnetic Mg-Fe/LDH Intercalated Activated Carbon Composites for Nitrate and Phosphate Removal from Wastewater: Insight into Behavior and Mechanisms

Magnetic Mg-Fe/LDH Intercalated Activated Carbon Composites for Nitrate and Phosphate Removal from Wastewater: Insight into Behavior and Mechanisms

Synthesis of a novel magnetic Caragana korshinskii biochar/Mg–Al layered double hydroxide composite and its strong adsorption of phosphate in aqueous solutions

Phosphate ion adsorption properties of PAN-based activated carbon fibers prepared with K2CO3 activation

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