Rapid and efficient chromium (VI) removal from aqueous solutions using nickel hydroxide nanoplates (nNiHs)

Maamoun, Ibrahim; Bensaida, Khaoula; Eljamal, Ramadan; Falyouna, Omar; Tanaka, Kohei; Tosco, Tiziana Anna Elisabetta; Sugihara, Yuji; Eljamal, Osama

doi:10.1016/j.molliq.2022.119216

Cited by 53 publications

(13 citation statements)

References 83 publications

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“…At a high ionic strength, charged equilibrium ions surround the adsorption sites with an opposite charge, partially neutralize the charge at the adsorption sites, and weaken the electrostatic interaction between adsorption sites and adsorbent [59,84]. The effect of ionic strength suggests that outer-sphere adsorption is the main adsorption mechanism, which is consistent with the findings of previous reports [67].…”

Section: Effect Of Operational Conditionssupporting

confidence: 90%

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Efficient Nitrate Adsorption from Groundwater by Biochar-Supported Al-Substituted Goethite

et al. 2022

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Groundwater nitrate contamination is challenging and requires efficient solutions for nitrate removal. This study aims to investigate nitrate removal using a novel adsorbent, biochar-supported aluminum-substituted goethite (BAG). The results showed that an increase in the initial Al/(Al + Fe) atomic ratio for BAGs from 0 to 20% decreased the specific surface area from 115.2 to 75.7 m2/g, but enhanced the surface charge density from 0.0180 to 0.0843 C/m2. By comparison, 10% of Al/(Al + Fe) led to the optimal adsorbent for nitrate removal. The adsorbent’s adsorption capacity was effective with a wide pH range (4–8), and decreased with increasing ionic strength. The descending order of nitrate adsorption inhibition by co-existing anions was SO42−, HCO3−, PO43−, and Cl−. The adsorption kinetics and isotherms agreed well with the pseudo-first-order equation and Langmuir model, respectively. The theoretical maximum adsorption capacity was 96.1469 mg/g. Thermodynamic analysis showed that the nitrate adsorption was spontaneous and endothermic. After 10-cycle regeneration, the BAG still kept 92.6% of its original adsorption capacity for synthetic nitrate-contaminated groundwater. Moreover, the main adsorption mechanism was attributed to electrostatic attraction due to the enhancement of surface charge density by Al substitution. Accordingly, the BAG adsorbent is a potential solution to remove nitrate from groundwater.

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Section: Effect Of Operational Conditionssupporting

confidence: 90%

“…According to AICc, the best-fit model is the one with the minimum AICc value. The formula for AICc is [67]:…”

Section: Isothermal Studiesmentioning

confidence: 99%

Efficient Nitrate Adsorption from Groundwater by Biochar-Supported Al-Substituted Goethite

et al. 2022

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“…Magnesium hydroxide was chosen for the coating of bare/Fe 0 due to the following reasons: 1) Magnesium is well known as one of the trace elements that could be unitized by microorganisms, implying that the coated layer on the surface of Fe0 will not possess any destructive effect on microorganisms in the anaerobic digesters. 2) Magnesium hydroxide has several features such as its low preparation cost, high surface area, non-magnetization, and low solubility constant [20,21]. These special characteristics make it as a perfect coating substance for the bare/Fe 0 compared with the other coating substances.…”

Section: Resultsmentioning

confidence: 99%

The role of coated nanoscale zero-valent iron with magnesium hydroxide in improving methane production during the anaerobic digestion of waste sludge

ELjamal¹,

Maamoun²,

Idham³

et al. 2022

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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This study investigates the role of coated/Fe 0 in improving the anaerobic digestion process for the purpose of increasing methane gas production rate as one of the renewable sources of energy. Up until now, the anaerobic digestion of methane production by utilizing different environmental wastes is facing many challenges including the low conversion of biomass into energy. Therefore, in this work, we used the coated/Fe 0 with magnesium hydroxide as an additive during the anaerobic digestion of waste sludge. Two semi-continuous bioreactors were operated with and without adding the coated/Fe 0 over 70 days. The result showed that the addition of coated/Fe 0 enhanced methane production by 120% compared with the control reactor. The experimental and predicted methane values have proved the great potential of coated/Fe 0 towards the practical applications of AD process.

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“…For both isotherm models, Akaike Information Criterion (AIC) was estimated to examine the goodness of model fittings as a function of the sum of the squared errors [32,33]. Lower AIC values indicate a better-fitting model [33,34].…”

Section: Phosphate Adsorption Isothermmentioning

confidence: 99%

Iron and Magnesium Impregnation of Avocado Seed Biochar for Aqueous Phosphate Removal

et al. 2022

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There has been increasing interest in using biochar for nutrient removal from water, and its application for anionic nutrient removal such as in phosphate (PO43−) necessitates surface modifications of raw biochar. This study produced avocado seed biochar (AB), impregnated Fe- or Mg-(hydr)oxide onto biochar (post-pyrolysis), and tested their performance for aqueous phosphate removal. The Fe- or Mg-loaded biochar was prepared in either high (1:8 of biochar to metal salt in terms of mass ratio) or low (1:2) loading rates via the co-precipitation method. A total of 5 biochar materials (unmodified AB, AB + High Fe, AB + Low Fe, AB + High Mg, and AB + Low Mg) were characterized according to their selected physicochemical properties, and their phosphate adsorption performance was tested through pH effect and adsorption isotherm experiments. Fe-loaded AB contained Fe3O4, while Mg-loaded AB contained Mg(OH)2. The metal (hydr)oxide inclusion was higher in Fe-loaded AB. Mg-loaded AB showed a unique free O–H functional group, while Fe-loaded AB showed an increase in its specific surface area more than 10-times compared to unmodified AB (1.8 m2 g−1). The effect of the initial pH on phosphate adsorption was not consistent between Fe-(anion adsorption envelope) vs. Mg-loaded AB. The phosphate adsorption capacity was higher with Fe-loaded AB in low concentration ranges (≤50 mg L−1), while Mg-loaded AB outperformed Fe-loaded AB in high concentration ranges (75–500 mg L−1). The phosphate adsorption isotherm by Fe-loaded AB fit well with the Langmuir model (R2 = 0.91–0.96), indicating the adsorptive surfaces were relatively homogeneous. Mg-loaded biochar, however, fit much better with Freundlich model (R2 = 0.94–0.96), indicating the presence of heterogenous adsorptive surfaces. No substantial benefit of high loading rates in metal impregnation was found for phosphate adsorption. The enhanced phosphate removal by Mg-loaded biochar in high concentration ranges highlights the important role of the chemical precipitation of phosphate associated with dissolved Mg2+.

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Rapid and efficient chromium (VI) removal from aqueous solutions using nickel hydroxide nanoplates (nNiHs)

Cited by 53 publications

References 83 publications

Efficient Nitrate Adsorption from Groundwater by Biochar-Supported Al-Substituted Goethite

Efficient Nitrate Adsorption from Groundwater by Biochar-Supported Al-Substituted Goethite

The role of coated nanoscale zero-valent iron with magnesium hydroxide in improving methane production during the anaerobic digestion of waste sludge

Iron and Magnesium Impregnation of Avocado Seed Biochar for Aqueous Phosphate Removal

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