Adsorption of Phosphates from Aqueous Solutions on Alginate/Goethite Hydrogel Composite

Siwek, H.; Bartkowiak, Artur; Włodarczyk, Małgorzata

doi:10.3390/w11040633

Cited by 45 publications

(36 citation statements)

References 53 publications

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“…A porous structure was previously reported for CMC-ALG beads (Kim et al, 2012). Fairly long equilibration times were reported for the sorption of phosphorus onto alginate/goethite composites (264 hr, (Siwek, Bartkowiak, & Włodarczyk, 2019)) and onto aluminum ALG-N-Isopropylacrylamide beads (14 hr, (Wan et al, 2016)). Despite the long equilibration times, even after 30 min, the mg PO 4 adsorbed/g sorbent were nearly doubled for ACMC beads (0.09 mg/g) than for POP powder (0.06 mg/g), as shown in Figure 6.…”

Section: Research Articlementioning

confidence: 61%

Phosphate removal from water using alginate/carboxymethylcellulose/aluminum beads and plaster of paris

Malicevic

Pacheco

Lamont

et al. 2020

Water Environment Research

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Phosphorus released in lakes due to agricultural water runoff causes eutrophication, deteriorating water quality and harming ecosystems. Two adsorbents were studied for the removal of phosphate from water: plaster of Paris powder and hydrogel beads produced using alginate, carboxymethylcellulose, and aluminum. The reaction kinetics, adsorption capacity, and ability to desorb were compared. Sorption of phosphate with either plaster of Paris or hydrogel beads was well described by the Langmuir model. In deionized water, hydrogel beads had a maximum sorption capacity of 90.5 mg PO43- /g dry bead with an equilibration time of approximately 24 hr. Monovalent anions (e.g., chloride) did not affect phosphorus sorption onto hydrogel beads, whereas divalent anions (e.g., sulfate) hindered sorption. In deionized water, plaster of Paris (POP) powder has a maximum capacity of 1.52 mg PO43- /g with an equilibrium time of less than 10 min. Sorbents can potentially be reused following phosphate desorption, and desorbed phosphate may be reused as fertilizer. At pH = 9.5, hydrogel beads desorbed up to 60% of the original amount of phosphate sorbed and lower amounts at lower pH. At pH = 2, POP powder desorbed only 35% of the initial phosphate sorbed, and desorption decreased with increasing pH. Practitioner points The maximum sorption capacity of plaster of Paris is 1.52 mg PO43- /g. The maximum sorption capacity of hydrogel beads is 90.5 mg PO43- /g. Monovalent anions do not affect phosphorus sorption, and divalent anions hinder it by ≈36%. Sorption is well described by Langmuir isotherms (R2 > 0.98). Hydrogel beads desorb 60% of phosphorus at pH = 9, possibly allowing phosphorus reuse.

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Section: Research Articlementioning

confidence: 61%

Phosphate removal from water using alginate/carboxymethylcellulose/aluminum beads and plaster of paris

Malicevic

Pacheco

Lamont

et al. 2020

Water Environment Research

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“…According to their research, the peak at 170 • C presents the removal process of the lignite sulfonated humic acid functional group (hydroxyl, carboxyl, phenol hydroxyl group, etc.) [40,41]. In this study, peat sulfonated at a high temperature may trigger functional group desorption.…”

Section: The Selection Of the Sulfonated Peatmentioning

confidence: 80%

“…However, the modified peat exhibited a greater adsorption efficiency to Cr(VI) than the natural peat. Therefore, based on the above results, it is suggested that chemisorption dominated the adsorption process [1,40,42]. The FT-IR spectra of the natural, modified, and Cr-loaded modified peat are presented in Figure 3, wherein the band intensity of the modified peat was stronger than that of the natural one.…”

Section: Characterization Of Peat Samplesmentioning

confidence: 83%

Section: Characterization Of Peat Samplesmentioning

confidence: 87%

“…Peat samples (0.08 ± 0.002 g) were added to 25 mL of 100 mg/L Cr(VI) solutions and shaken at the rate of 300 rpm at room temperature of 25 ± 1 • C and pH of about 6-7 for different periods of 10,20,30,40,50,60,70,80,90,120,150,180,210,240,270, and 300 min, respectively. The material in each tube was then centrifuged, and chromium ion concentrations of their supernatants were measured by inductively coupled plasma optical emission spectrometry (ICP-OES).…”

Section: Adsorption Kinetics and Their Fittingmentioning

confidence: 99%

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Removal of Hexavalent Chromium from Aqueous Solutions Using Sulfonated Peat

Hou

Chen

et al. 2019

Water

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Peat, a loose and porous material, contains rich organic matter and can be used as an adsorbent. In this study, it is chemically modified by adding sulfuric acid under different conditions, with the aim of producing a modified peat with optimized Cr(VI) adsorption capability. The modified peat exhibited a higher adsorption efficiency than the natural peat throughout the adsorption experiments. The adsorption of Cr(VI) from aqueous solutions correlates with the pseudo-second order kinetic model. In addition, the Langmuir model indicated a maximum loading capacity approximately of 105.4 mg/g, which is a markedly high value compared to some other reported adsorbents. The present study performed single factor experiments and the results indicated that higher temperature conditions result in better adsorption capability, whilst an increase in the pH played a contrary role. According to the orthogonal tests, the pH had the greatest impact on adsorption. The obtained results indicated that sulfonated peat can be effectively applied in removing Cr (VI).

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The removal of inorganic phosphate from water using carboxymethyl cellulose‐iron hydrogel beads

Ure

Mutus

2020

J of Chemical Tech & Biotech

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BACKGROUND: Inorganic phosphate (P i) is key to improved crop yields; however, agricultural drainage leads to the accumulation of this nutrient in aquatic ecosystems and promotes the formation of harmful algal blooms. The aim of this study was to produce a hydrogel with high binding capacity and affinity towards P i produced from carboxymethyl cellulose (CMC) and iron (III) chloride (FeCl 3). RESULTS: CMC was converted to CMC-Fe composites by incubation with FeCl 3. The half-lives (t 1/2) of CMC functionalization with 25 mmol L −1 FeCl 3 were 11.56 min (1.5% CMC) and 13.91 min (3.0% CMC). The apparent dissociation constants (K D App) of CMC-Fe were estimated to be 33.99 ∼mol L −1 (1.5% CMC Fe) and 24.81 ∼mol L −1 (3.0% CMC-Fe). The phosphate binding capacity (PBC) of the hydrated hydrogels were 74.0 ± 3.06 mg g −1 (1.5% CMC Fe) and 91.4 ± 4.51 mg g −1 (3.0% CMC-Fe). Laboratory-scale continuous flow filtration studies showed an average removal of 91.3% (mixed filter) and 52.5% (unmixed filter). Batch type treatment of agricultural drainage showed a reduction in P i content from 0.40 to 0.11 mg L −1 (1.5% CMC-Fe) and 0.17 mg L −1 (3.0% CMC-Fe). The amount of bound-P i was 26.7 ± 0.63 ∼g g −1 (1.5% CMC-Fe) and 32.8 ± 1.31 ∼g g −1 (3.0% CMC-Fe). The iron leached from 1.5% and 3.0% CMC-Fe beads was 11.98 ± 1.80 and 3.57 ± 1.63 mg g −1 , respectively. CONCLUSION: The CMC-Fe hydrogel shows great promise as a P i-adsorbing material with applications in the treatment of agricultural drainage.

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Adsorption of Phosphates from Aqueous Solutions on Alginate/Goethite Hydrogel Composite

Cited by 45 publications

References 53 publications

Phosphate removal from water using alginate/carboxymethylcellulose/aluminum beads and plaster of paris

Phosphate removal from water using alginate/carboxymethylcellulose/aluminum beads and plaster of paris

Removal of Hexavalent Chromium from Aqueous Solutions Using Sulfonated Peat

The removal of inorganic phosphate from water using carboxymethyl cellulose‐iron hydrogel beads

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