Nanoscale Zero-Valent Iron Confined in Anion Exchange Resins to Enhance Selective Adsorption of Phosphate from Wastewater

Liu, Guanglong; Kong, Minghao; Abdelraheem, Wael; Nadagouda, Mallikarjuna N.; Dionysiou, Dionysios D.

doi:10.1021/acsestengg.1c00506

Cited by 24 publications

(8 citation statements)

References 43 publications

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“…As the voltage was increased from 0 to 2 V, the current had a proportional increase, with a surface charge density at pH 7 of 0.146 mA/cm 2 . Thus, the increased kinetics for the phosphate removal in the presence of an electric field could be due to the increased near-surface electromigration as well as the greater electrostatic interactions with the sorption sites. , Additionally, anodic capacitive charging of the h-Ti 3 C 2 T x (24 h) surface could increase the stability of the adsorbed phosphates and limit desorption, leading to an increase in the kinetics for phosphate sorption. , …”

Section: Resultsmentioning

confidence: 99%

“…Thus, the increased kinetics for the phosphate removal in the presence of an electric field could be due to the increased near-surface electromigration as well as the greater electrostatic interactions with the sorption sites. 35,36 Additionally, anodic capacitive charging of the h-Ti 3 C 2 T x (24 h) surface could increase the stability of the adsorbed phosphates and limit desorption, leading to an increase in the kinetics for phosphate sorption. 26,37 The physicochemical properties of h-Ti 3 C 2 T x filters and the phosphate species were closely correlated to the pH of the solution.…”

Section: Characterization Of the H-ti 3 C 2 Tmentioning

confidence: 99%

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Surface Engineering of Electrified MXene Filter for Enhanced Phosphate Removal

et al. 2023

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The discharge of wastewater contaminated with low concentrations of phosphate can have serious consequences, including environmentally disastrous blooms of algae and harmful concentrations of phosphate in public water sources. Herein, we demonstrate an electrofiltration system with a flow-through configuration that uses an electrified hydroxyl-terminated Ti 3 C 2 T x MXene (h-Ti 3 C 2 T x ) filter to achieve near complete removal of ultralow concentration phosphate (5 mg P/L). Increasing either the applied voltage or the flow rate increases the phosphate sorption kinetics of the electrified h-Ti 3 C 2 T x filter. With a 6 mL/min recirculating flow rate, the h-Ti 3 C 2 T x filter exhibits a sorption kinetics of 1.97 h −1 and sorption capacity of 91.8 mg P/g, which was 2.6-and 4.3-fold higher than that of a pristine Ti 3 C 2 T x filter, respectively. The enhanced electrofiltration kinetics and capacities are attributed to the synergistic effects of plentiful sites for sorption, electrochemical enhancement, and flow-through design. The mechanism for phosphate sorption combined interlayer diffusion with surface complexation at the outer level in terms of electrostatic attraction and at the inner level in terms of Ti−O−P interactions. Overall, our research elucidates the utilization of a flow-through electrified filter incorporating −OH groups that can boost the sorption kinetics and capacity for phosphate, offering a promising paradigm for efficient water purification.

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Section: Resultsmentioning

confidence: 99%

Section: Characterization Of the H-ti 3 C 2 Tmentioning

confidence: 99%

Surface Engineering of Electrified MXene Filter for Enhanced Phosphate Removal

et al. 2023

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“…Therefore, it is impendent to explore efficient technologies to remove phosphates from phosphaterich wastewater. [4] Various approaches have been exploited to remove phosphate, including chemical precipitation, [5] adsorption, [6] electrochemical, [7] biological treatment, [8] etc. Among them, adsorption is regarded as the most efficient and feasible route because of its easy operation, low power consumption, less secondary pollution and high efficiency at trace level wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…However, excessive phosphates (above 0.02 mg/L) in effluents can induce severe eutrophication of water bodies [3] and thus disrupt the aquatic ecological balance. Therefore, it is impendent to explore efficient technologies to remove phosphates from phosphate‐rich wastewater [4] …”

Section: Introductionmentioning

confidence: 99%

Phosphate Adsorption on Cerium/Terephthalic Acid Metal–Organic Frameworks (Ce‐MOF) Driven by Effective Electrostatic Attraction and Ligand Exchange in a Wide pH Range

Zhou

Huang

et al. 2023

Chemistry An Asian Journal

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Eutrophication has posed a threat to aquatic ecosystems, so it's urgent to remove excessive phosphate from water. In this study, we developed an adsorbent material, cerium/terephthalic‐acid metal‐organic‐frameworks (Ce‐MOF), to remove phosphate from different water systems. The optimal Ce‐MOF presented a maximum phosphate adsorption capacity of 377.2 mg/g, approximately 3.7 times higher than that of the commercial phosphate adsorbent (Phoslock: 101.6 mg/g). Experimental and computational analysis suggested that pH dominated the adsorption process. The main forces driving the adsorption process changed from the synergistic effect of electrostatic attraction and ligand exchange at lower pH to only ligand exchange at the increased pH values. Hence, the Ce‐MOF is applicable for phosphate adsorption in a wide pH range. Impressively, the adsorbent remained an excellent phosphate adsorption performance in the real water containing various interfering ions and organic matters, indicating the potential of Ce‐MOF for the practical use to solve the water eutrophication issue.

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“…nZVI is a material with high porosity and small particle size, contributing to its large specific surface area and high reactivity compared to bulk materials [ 16 , 17 ]. Furthermore, nZVI can be easily operated, non-toxic, and inexpensive, and due to its magnetic properties, spent nZVI can be easily recuperated from the solution using an external magnetic field, which eliminates the problem of recovery and secondary contamination [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

nZVI-Based Nanomaterials Used for Phosphate Removal from Aquatic Systems

et al. 2023

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In the last decade, the application of nanoscale zero-valent iron (nZVI) has garnered great attention as an adsorbent due to its low cost, non-toxicity, high porosity, and BET-specific surface area. In particular, the immobilization of nZVI particles onto inorganic and organic substrates (nanocomposites) decreased its agglomeration, allowing them to be effective and achieve greater adsorption of pollutants than pristine nanoparticles (NPs). Although nZVI began to be used around 2004 to remove pollutants, there are no comprehensive review studies about phosphate removal from aquatic systems to date. For this reason, this study will show different types of nZVI, pristine nZVI, and its nanocomposites, that exist on the market, how factors such as pH solution, oxygen, temperature, doses of adsorbent, initial phosphate concentration, and interferents affect phosphate adsorption capacity, and mechanisms involved in phosphate removal. We determined that nanocomposites did not always have higher phosphate adsorption than pristine nZVI particles. Moreover, phosphate can be removed by nZVI-based nanoadsorbents through electrostatic attraction, ion exchange, chemisorption, reduction, complexation, hydrogen bonding, and precipitation mechanisms. Using the partition coefficient (PC) values, we found that sepiolite-nZVI is the most effective nanoadsorbent that exists to remove phosphate from aqueous systems. We suggest future studies need to quantify the PC values for nZVI-based nanoadsorbents as well as ought to investigate their phosphate removal efficiency under natural environmental conditions.

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Nanoscale Zero-Valent Iron Confined in Anion Exchange Resins to Enhance Selective Adsorption of Phosphate from Wastewater

Cited by 24 publications

References 43 publications

Surface Engineering of Electrified MXene Filter for Enhanced Phosphate Removal

Surface Engineering of Electrified MXene Filter for Enhanced Phosphate Removal

Phosphate Adsorption on Cerium/Terephthalic Acid Metal–Organic Frameworks (Ce‐MOF) Driven by Effective Electrostatic Attraction and Ligand Exchange in a Wide pH Range

nZVI-Based Nanomaterials Used for Phosphate Removal from Aquatic Systems

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