Optimized nano-scale zero-valent iron supported on treated activated carbon for enhanced nitrate and phosphate removal from water

Khalil, Ahmed M.E.; Eljamal, Osama; Amen, Tareq W.M.; Sugihara, Yuji; Matsunaga, Nobuhiro

doi:10.1016/j.cej.2016.10.080

Cited by 237 publications

(77 citation statements)

References 28 publications

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“…The corrosion of iron led to an initial higher effluent pH of 10.7 [43]. This suggests that the iron corrosion could cause release of iron ions into the solution to form Fe-P precipitates as described below [13,22].…”

Section: Removal Of Phosphatementioning

confidence: 97%

Reactive Transport and Removal of Nutrients and Pesticides in Engineered Porous Media

Tong

Zhuang

Chen

2019

Water

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Agricultural nonpoint pollution has been recognized as a primary source of nutrients and pesticides that contaminate surface water and groundwater. Reactive materials have great potential to remove nutrients and pesticides from agricultural drainage water. In this study, we investigated the reactive transport and removal of coexisting nitrate, phosphate, and three pesticides (tricyclazole, isoprothiolane, and malathion) by iron filings and natural ore limestone through column experiments under saturated flow conditions. Breakthrough results showed that 45.0% and 35.8% of nitrate were removed by iron filings and limestone during transport, with average removal capacities of 2670 mg/kg and 1400 mg/kg, respectively. The removal of nitrate was mainly due to microbial denitrification especially after 131–154 pore volumes (≈30 d), whereas reduction to ammonia dominated nitrate removal in iron filings during early phase (i.e., <21.7 d). The results showed that 68.2% and 17.6% of phosphate were removed by iron filings and limestone, with average removal capacities of 416.1 mg/kg and 155.2 mg/kg, respectively. Mineral surface analyses using X-ray diffraction (XRD) and scanning electron microscope (SEM) coupled with energy-dispersive X-ray analysis (EDX) suggested that ligand exchange, chemical precipitation, and electrostatic attraction were responsible for phosphate removal. Chemical sorption was the main mechanism that caused removals of 91.6–100% of malathion and ≈27% of isoprothiolane in iron filings and limestone. However, only 22.0% and 1.1% of tricycalzole were removed by iron filings and limestone, respectively, suggesting that the removal might be relevant to the nonpolarity of tricyclazole. This study demonstrates the great potential of industrial wastes for concurrent removal of nutrients and pesticides under flow conditions.

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Section: Removal Of Phosphatementioning

confidence: 97%

Reactive Transport and Removal of Nutrients and Pesticides in Engineered Porous Media

Tong

Zhuang

Chen

2019

Water

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“…However, the sulfate and bicarbonate anion have less tendency to adsorb in the presence of phosphate. Therefore, the presence of competitor anions (100 mg L −1 HCO − 3 + 50 mg L −1 SO 2− 4 ) in the phosphate solution of 40 mg L −1 and does not significantly affect the adsorption of phosphate [6,44].…”

Section: Adsorption Isothermmentioning

confidence: 99%

Activated carbon produced from Glycyrrhiza glabra residue for the adsorption of nitrate and phosphate: batch and fixed-bed column studies

et al. 2020

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In the present study, Glycyrrhiza glabra residues (GGR) were used for the preparation of activated carbon, with a surface area of 959.22 m 2 g −1 . Activated carbon was prepared through chemical activation using ZnCl 2 at optimum carbonization temperature, and impregnation ratio for nitrate, and phosphate removal. The effect of contact time and adsorbent dosage on the removal efficiency was investigated, and the pseudo-second-order kinetic model correlated well with the adsorption data. The response surface methodology was applied for the determination of the effect of initial concentration, pH, and temperature and their interaction on the removal efficiency in the batch adsorption system. The Langmuir isotherm generated a satisfactory fit with the experimental data, and the maximum adsorption capacity was 142.5 mg g −1 at 308 K and 92.5 mg g −1 at 298 K for nitrate and phosphate removal, respectively. The high adsorption capacity reveals the applicability of the GGR activated carbon for nitrate and phosphate removal. Furthermore, the fixed-bed column adsorption studies were carried out, and the effect of flow rate and influent concentration on the behavior of the breakthrough curve was studied. The breakthrough time decreased by increasing the flow rate and inlet concentration. The Thomas and Yoon-Nelson models were suitable models for the design of GGR activated carbon fixed-bed column. The LUB of 0.44 cm and 4.35 cm was obtained for nitrate and phosphate with the inlet concentration of 20 mg L −1 and a flow rate of 40 mL min −1 , respectively. GGR is a new adsorbent that has not been previously utilized for adsorption of phosphate and nitrate.

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“…However, nZVI is easily agglomerated and oxidized in some environments, which results in low reactivity [12]. To address these issues, resin [13], activated carbon [14], biochar [15] and other substances [16] have been used as porous-based support materials for the nZVI. In comparison with other materials, biochar has proven to be a cost-effective and environmentally friendly nZVI support due to its large porosity and specific surface area [17].…”

Section: Introductionmentioning

confidence: 99%

Detoxification of Cr(VI) using biochar-supported Cu/Fe bimetallic nanoparticles

Shao¹,

ShaoYu²,

Xu³

et al. 2019

Desalination and Water Treatment

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Nanoscale zero-valent iron (nZVI) has been proven to be more effective for the treatment of hexavalent chromium(Cr(VI)) when modified with the transition metal Cu. In this study, biochar-supported Cu/Fe bimetallic nanoparticles (Cu-nZVI/BC) were prepared and used for Cr(VI) removal from aqueous solution. The effects of the pH value, the initial concentration of Cr(VI), coexisting ions and humic acids (HA) were investigated. The compositional structures of Cu-nZVI/BC were analyzed by transmission electron microscopy, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The maximum removal efficiency of Cr(VI) was 50.57% (126.41 ± 3.75 mg g-1) for Cu-nZVI/BC at pH 2. The adsorption kinetic data were in agreement with the pseudo-second-order model, which confirmed that the adsorption step was a chemical adsorption and reduction process. The presence of Ca 2+ and NO 3 had an inhibitory effect on Cr(VI) removal, while dHA increased the removal efficiency at high concentrations. This study proves that Cu-nZVI/BC removal of solution Cr(VI) is feasible and shows significant potential in practical applications.

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Optimized nano-scale zero-valent iron supported on treated activated carbon for enhanced nitrate and phosphate removal from water

Cited by 237 publications

References 28 publications

Reactive Transport and Removal of Nutrients and Pesticides in Engineered Porous Media

Reactive Transport and Removal of Nutrients and Pesticides in Engineered Porous Media

Activated carbon produced from Glycyrrhiza glabra residue for the adsorption of nitrate and phosphate: batch and fixed-bed column studies

Detoxification of Cr(VI) using biochar-supported Cu/Fe bimetallic nanoparticles

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