Removal of phosphate from water by amine-functionalized copper ferrite chelated with La(III)

Gu, Wei; Li, Xiaodi; Xing, Mingchao; Fang, Wenkan; Wu, Deyi

doi:10.1016/j.scitotenv.2017.11.098

Cited by 56 publications

(13 citation statements)

References 46 publications

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“…Consequently, the adsorption of these anions is inhibited by competition with other weakly adsorbing coexisting anions. On the contrary, anions that adsorb by inner-sphere complexation either display little sensitivity to ionic strength (or competing ligands) or respond to increasing ionic strength with increased adsorption 29,68,69 . Chubar and coworkers 70 attributed this phenomenon to intermediate complex formation by chloride anions (by replacing the surface hydroxyl anions) with metal oxides; such complexation reduce the energy required for chelation between H 2 PO 4 − and metal oxide surfaces 25,70 .…”

Section: Resultsmentioning

confidence: 99%

Adsorption of phosphate on iron oxide doped halloysite nanotubes

Almasri

Saleh

Atieh

et al. 2019

Sci Rep

120

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Excess phosphate in water is known to cause eutrophication, and its removal is imperative. Nanoclay minerals are widely used in environmental remediation due to their low-cost, adequate availability, environmental compatibility, and adsorption efficiency. However, the removal of anions with nanoclays is not very effective because of electrostatic repulsion from clay surfaces with a net negative charge. Among clay minerals, halloysite nanotubes (HNTs) possess a negatively charged exterior and a positively charged inner lumen. This provides an increased affinity for anion removal. In this study, HNTs are modified with nano-scale iron oxide (Fe 2 O 3 ) to enhance the adsorption capacity of the nanosorbent. This modification allowed for effective distribution of these oxide surfaces, which are known to sorb phosphate via ligand exchange and by forming inner-sphere complexes. A detailed characterization of the raw and (Fe 2 O 3 ) modified HNTs (Fe-HNT) is conducted. Influences of Fe 2 O 3 loading, adsorbent dosage, contact time, pH, initial phosphate concentration, and coexisting ions on the phosphate adsorption capacity are studied. Results demonstrate that adsorption on Fe-HNT is pH-dependent with fast initial adsorption kinetics. The underlying mechanism is identified as a combination of electrostatic attraction, ligand exchange, and Lewis acid-base interactions. The nanomaterial provides promising results for its application in water/wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Adsorption of phosphate on iron oxide doped halloysite nanotubes

Almasri

Saleh

Atieh

et al. 2019

Sci Rep

120

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“…Thus depending on the type of ions present in the water matrix, the adsorption of phosphate can get enhanced or reduced (Suresh Kumar et al., 2018). Adsorbent selectivity is often tested in the presence of separate competing ions with varying concentrations (Antelo et al., 2007; Gu et al., 2018; Sengupta and Pandit, 2011). But in realistic conditions several competing ions will exist together and can interact to form different complexes or precipitates.…”

Section: Introductionmentioning

confidence: 99%

Adsorption as a technology to achieve ultra-low concentrations of phosphate: Research gaps and economic analysis

Korving²,

et al. 2019

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Eutrophication and the resulting formation of harmful algal blooms (HAB) causes huge economic and environmental damages. Phosphorus (P) from sewage effluent and agricultural run-off has been identified as a major cause for eutrophication. Phosphorous concentrations greater than 100 μg P/L are usually considered high enough to cause eutrophication. The strictest regulations however aim to restrict the concentration below 10 μg P/L. Orthophosphate (or phosphate) is the bioavailable form of phosphorus. Adsorption is often suggested as technology to reduce phosphate to concentrations less than 100 and even 10 μg P/L with the advantages of a low-footprint, minimal waste generation and the option to recover the phosphate. Although many studies report on phosphate adsorption, there is insufficient information regarding parameters that are necessary to evaluate its application on a large scale. This review discusses the main parameters that affect the economics of phosphate adsorption and highlights the research gaps. A scenario and sensitivity analysis shows the importance of adsorbent regeneration and reuse. The cost of phosphate adsorption using reusable porous metal oxide is in the range of $ 100 to 200/Kg P for reducing the phosphate to ultra-low concentrations. Future research needs to focus on adsorption capacity at low phosphate concentrations, regeneration and reuse of both the adsorbent and the regeneration liquid.

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“…In comparison to the aforementioned methods, the adsorption process is promising for phosphate removal attributed to its attractive advantages, which is simple operation, high removal efficiency and fast adsorption rate, especially at low phosphate concentration. In general adsorption is one of the most attractive approaches in water treatment, with the advantage of having high removal efficiency without yielding harmful bi-products [4]- [9].…”

Section: Methods Of Phosphate Removal From West Watermentioning

confidence: 99%

“…Thus, the removal of phosphate, the main species of phosphorus, from wastewater before discharge is one of the most effective ways for eutrophication control [9]. Adsorption is a promising technology for the removal of phosphate.…”

Section: Introductionmentioning

confidence: 99%

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Review: Low Cost, Environmentally Friendly Humic Acid Coated Magnetite Nanoparticles (HA-MNP) and Its Application for the Remediation of Phosphate from Aqueous Media

Damena¹,

Alansi²

2018

JEAS

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Phosphate is a primary nutrient required for the normal functioning of many organisms in the ecosystem. However, presence of excess phosphate into the aquatic systems leads to eutrophication which can promote harmful algal growth and decrease the amount of dissolved oxygen in water. Municipal, industrial and agricultural run-off wastewaters are the major point sources for phosphate discharges. There are different methods to remove phosphates from water. Among these, adsorption is the most widely accepted method for phosphate removal because of its high efficiency, minimum cost, easy and simple operation and applicability at lower concentrations. The emphasis of this review, is to consolidate low cost, environmentally friendly humic acid coated magnetite nanoparticles (HA-MNP) and its application for the remediation of phosphate from aqueous media. The magnetic nanoparticles could be easily separated from the reaction mixture by using a simple hand held magnet and adsorption studies demonstrate the fast and effective separation of phosphate with maximum removal efficiency > 90% at pH 6.6. The adsorption behavior follows the Freundlich isotherm and the removal of phosphate is found higher at acidic and neutral pH compared to basic conditions. The nanoparticles exhibit good selectivity and adsorption efficiency for phosphate in the presence of co-existing ions such as Cl − , 2 4 SO − and 3 NO −with some inhibition effect by 2 3 CO − and finally, the effect of temperature on the adsorption reveals that the process is endothermic and spontaneous.

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Removal of phosphate from water by amine-functionalized copper ferrite chelated with La(III)

Cited by 56 publications

References 46 publications

Adsorption of phosphate on iron oxide doped halloysite nanotubes

Adsorption of phosphate on iron oxide doped halloysite nanotubes

Adsorption as a technology to achieve ultra-low concentrations of phosphate: Research gaps and economic analysis

Review: Low Cost, Environmentally Friendly Humic Acid Coated Magnetite Nanoparticles (HA-MNP) and Its Application for the Remediation of Phosphate from Aqueous Media

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