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

Alagha, Omar; Manzar, Mohammad Saood; Zubair, Mukarram; Anıl, Ismail; Mu’azu, Nuhu Dalhat; Qureshi, Aleem

doi:10.3390/nano10071361

Cited by 78 publications

(27 citation statements)

References 68 publications

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“…It is found that there are no significant variations in the adsorption capacities of MO with the participation of PO 4 3− , NO 3 − , SO 4 2− , Cl − , or CO 3 2− (Figure S6, Supporting Information ), illustrating that the presence of these five anions have no interfering effect for the adsorption of MO by S‐doped MMC‐2, which is in good agreement with a previous study. [ 38 ]…”

Section: Resultsmentioning

confidence: 99%

S‐Doped Magnetic Mesoporous Carbon for Efficient Adsorption of Methyl Orange from Aqueous Solution

Zhai

Zhu

et al. 2021

CLEAN Soil Air Water

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A simple and rapid soft‐templating coupled with one‐pot solvent thermal method is developed to synthesize S‐doped magnetic mesoporous carbon (S‐doped MMC). In this method, phenolic resin is used as a carbon precursor and Pluronic copolymer P123 is used as a template and 2,5‐dimercapto‐1,3,4‐thiadiazole is used as sulfur source. Prepared S‐doped MMC processes a high specific surface area, the Fe3O4 particles are well embedded in the mesoporous carbon walls that exhibit a strong magnetic response, and the hydrated iron nitrate loading amount of 0.808 g is the best. Batch adsorption experiments are carried out at different pH, initial concentration, temperature, and contact time on the adsorption of methyl orange (MO) by S‐doped MMC. The kinetic data of the adsorption process are better fitted with pseudo‐second‐order model than the pseudo‐first‐order model. Langmuir model is more suitable for the equilibrium data than Freundlich model. The thermodynamic parameters including ΔG0, ΔH0, and ΔS0 indicate that the adsorption is a feasible, spontaneous, and endothermic process. Finally, it is found that the coexistence of PO43−, NO3−, SO42−, Cl−, and CO32− does not influence the adsorption process. These results illustrate S‐doped MMC can be an efficient adsorbent for the removal of MO from wastewater.

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Section: Resultsmentioning

confidence: 99%

S‐Doped Magnetic Mesoporous Carbon for Efficient Adsorption of Methyl Orange from Aqueous Solution

Zhai

Zhu

et al. 2021

CLEAN Soil Air Water

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“…To further elucidate the phenol uptake mechanism under equilibrium conditions and determine the maximum uptake capacity of phenol onto the SBAC-MgAlFe-LDH, non-linear forms of the five (5) different popular equilibrium models were employed in this study [ 35 , 58 ]. The fittings of these isotherm models are depicted in Figure 6 , while their corresponding models’ parameters obtained are presented in Table 5 .…”

Section: Resultsmentioning

confidence: 99%

“…A coprecipitation process as reported by Alagha et al [ 35 ] was employed for the hybridization of the MgAlFe with the NaOH-SBAC to produce the SBAC-MgAlFe-LDH composite. Firstly, for each molar ratio of 0.05:0.05:0.1 of the precursor salts, which were Mg:Al:Fe salts (i.e., 1.3:1.9:4.04 g), 250 mg of the SBAC was homogeneously dispersed in 100 mL of the ionized water–salts mixture via ultrasonication for half an hour.…”

Section: Methodsmentioning

confidence: 99%

“…Interestingly, the Avrami model performance and model's parameters match that of the first order (Table 4), reaffirming the first-order model's better representation of the experimental data and its suitability for providing insight into the phenol uptake kinetics. To further elucidate the phenol uptake mechanism under equilibrium conditions and determine the maximum uptake capacity of phenol onto the SBAC-MgAlFe-LDH, non-linear forms of the five (5) different popular equilibrium models were employed in this study [35,58]. The fittings of these isotherm models are depicted in Figure 6, while their corresponding models' parameters obtained are presented in Table 5.…”

Section: Adsorption Kinetics and Equilibrium Studiesmentioning

confidence: 99%

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Process Optimization and Modeling of Phenol Adsorption onto Sludge-Based Activated Carbon Intercalated MgAlFe Ternary Layered Double Hydroxide Composite

2021

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A sewage sludge-based activated carbon (SBAC) intercalated MgAlFe ternary layered double hydroxide (SBAC-MgAlFe-LDH) composite was synthesized via the coprecipitation method. The adsorptive performance of the composite for phenol uptake from the aqueous phase was evaluated via the response surface methodology (RSM) modeling technique. The SBAC-MgAlFe-LDH phenol uptake capacity data were well-fitted to reduced RSM cubic model (R2 = 0.995, R2-adjusted = 0.993, R2-predicted = 0.959 and p-values < 0.05). The optimum phenol adsorption onto the SBAC-MgAlFe-LDH was achieved at 35 °C, 125 mg/L phenol, and pH 6. Under the optimal phenol uptake conditions, pseudo-first-order and Avrami fractional-order models provided a better representation of the phenol uptake kinetic data, while the equilibrium data models’ fitting follows the order; Liu > Langmuir > Redlich–Peterson > Freundlich > Temkin. The phenol uptake mechanism was endothermic in nature and predominantly via a physisorption process (ΔG° = −5.33 to −5.77 kJ/mol) with the involvement of π–π interactions between the phenol molecules and the functionalities on the SBAC-LDH surface. The maximum uptake capacity (216.76 mg/g) of SBAC-MgAlFe-LDH was much higher than many other SBAC-based adsorbents. The improved uptake capacity of SBAC-LDH was attributed to the effective synergetic influence of SBAC-MgAlFe-LDH, which yielded abundant functionalized surface groups that favored higher aqueous phase uptake of phenol molecules. This study showcases the potential of SBAC-MgAlFe-LDH as an effective adsorbent material for remediation of phenolic wastewater

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“…Layered double hydroxides (LDHs), known as hydrotalcites, have a potential role in the treatment of a wide range of anionic, organic and inorganic chemicals [ 15 , 16 , 17 ]. LDHs are inorganic substances composed of stacked layers of positively charged metal cations with charge-balancing anions situated in the interlayer sites [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

New Composite Sorbent for Removal of Sulfate Ions from Simulated and Real Groundwater in the Batch and Continuous Tests

et al. 2021

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The evaluation of groundwater quality in the Dammam formation, Faddak farm, Karbala Governorate, Iraq proved that the sulfate (SO42−) concentrations have high values; so, this water is not suitable for livestock, poultry and irrigation purposes. For reclamation of this water, manufacturing of new sorbent for permeable reactive barrier was required through precipitation of Mg and Fe hydroxides nanoparticles on the activated carbon (AC) surface with best Mg/Fe molar ratio of 7.5/2.5. Mixture of 50% coated AC and 50% scrap iron was applied to eliminate SO42− from contaminated water with efficiency of 59% and maximum capacity of adsorption equals to 9.5 mg/g for a time period of 1 h, sorbent dosage 40 g/L, and initial pH = 5 at 50 mg/L initial SO42− concentration and 200 rpm shaking speed. Characterization analyses certified that the plantation of Mg and Fe nanoparticles onto AC was achieved. Continuous tests showed that the longevity of composite sorbent is increased with thicker bed and lower influent concentration and flow rate. Computer solution (COMSOL) software was well simulated for continuous measurements. The reclamation of real contaminated groundwater was achieved in column set-up with efficiency of 70% when flow rate was 5 mL/min, bed depth was 50 cm and inlet SO42− concentration was 2301 mg/L.

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

Cited by 78 publications

References 68 publications

S‐Doped Magnetic Mesoporous Carbon for Efficient Adsorption of Methyl Orange from Aqueous Solution

S‐Doped Magnetic Mesoporous Carbon for Efficient Adsorption of Methyl Orange from Aqueous Solution

Process Optimization and Modeling of Phenol Adsorption onto Sludge-Based Activated Carbon Intercalated MgAlFe Ternary Layered Double Hydroxide Composite

New Composite Sorbent for Removal of Sulfate Ions from Simulated and Real Groundwater in the Batch and Continuous Tests

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