Removal and slow release studies of phosphate on surfactant loaded hydrothermally synthesized silicate nanoparticles

Bhardwaj, Deepesh; Sharma, Pankaj; Sharma, Monika; Tomar, Radha

doi:10.1016/j.jtice.2014.07.010

Cited by 19 publications

(9 citation statements)

References 28 publications

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“…The negative value of Δ S ° expresses less randomness of reaction during the phosphate adsorption (Jiang et al 2016), which can be attributed to the release of water molecules from molybdate accompanied by the coordination between this metal and phosphate. These findings were consistent with the adsorption of phosphate by La–modified tourmaline (Li et al 2015), natural loess (Jiang et al 2016), and surfactant loaded hydrothermally synthesized silicate nanoparticles (Bhardwaj et al 2014). …”

Section: Resultssupporting

confidence: 77%

Modification of Sargassum angustifolium by molybdate during a facile cultivation for high-rate phosphate removal from wastewater: structural characterization and adsorptive behavior

2016

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In this paper, a new and facile approach for molybdate loading in the brown algae of Sargassum angustifolium is introduced. The molybdate ions were entered into the algae body during a short cultivation to produce algae–Mo as a novel adsorbent for eliminating phosphate ions from synthetic and real wastewaters. Results of the surface analysis showed that molybdate loading onto the algae was successfully performed. Herein, basic variables, such as initial solution pH, adsorbent dosage, contact time, phosphate concentration, and temperature, were investigated in detail to assess the phosphate adsorption performance of algae–Mo. The pseudo-second-order kinetic model fitted our acquired experimental kinetic data most appropriately, in comparison to the use of a pseudo-first-order model. The Langmuir model appeared to fit the adsorption data more desirably than that of Freundlich and Dubnin–Radushkevich models, with a maximum phosphate adsorption capacity of 149.25 mg/g at 25 °C. The finding of the thermodynamic study revealed that the phosphate adsorption onto algae–Mo was spontaneous, feasible, and endothermic in nature. The study on Mo2+ ions leaching strongly suggested that the risk of Mo2+ leakage during phosphate adsorption was negligible at a wide pH range of 3–9. The adsorption efficiency attained was 53.4% at the sixth cycle of reusability. Two real wastewaters with different qualities were successfully treated by the algae–Mo, suggesting that the algae–Mo could be ordered for practical wastewater treatment.

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Section: Resultssupporting

confidence: 77%

Modification of Sargassum angustifolium by molybdate during a facile cultivation for high-rate phosphate removal from wastewater: structural characterization and adsorptive behavior

2016

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“…Some studies have shown that the main existent forms of P were H 3 PO 4 , H 2 PO 4 – , HPO 4 2– , and PO 4 3– , which existed in different forms at different pH values . In the pH value range in this paper, phosphorus mainly existed in two forms: H 2 PO 4 – and HPO 4 2– .…”

Section: Resultsmentioning

confidence: 53%

Strong Immobilization of Phosphate in Wastewater onto the Surface of MgO-Modified Industrial Hemp-Stem-Driven Biochar by Flowerlike Crystallization

Deng

Zhang

Kong

et al. 2020

Ind. Eng. Chem. Res.

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Removal of phosphate in wastewater is significant and available to control eutrophication, and adsorption is one of the most promising treatment methods. In this work, MgO-modified industrial hemp-stem-driven biochar was formed by in situ precipitation. Different from the adsorption behavior for phosphate using other adsorbents, the doped MgO nanoparticles onto the holes of biochar have been combined with phosphate to form stable crystal substances, e.g., the flowerlike Mg x (PO 4 ) y •zH 2 O. The results showed that, during the phosphate removal process, amorphous, single crystal, and polycrystal compounds were formed by ionic bonding and crystallization effect, which could be good for strong immobilization of the phosphate ions onto the surface of biochar. The characterization adsorbent results further confirmed that the carbonization condition also has an impact on the specific surface area of biochar and crystalline performance of MgO, and it affected the adsorption capacity of phosphate. The maximum adsorption capacity of phosphate was 233 mg/g with the Langmuir isotherm model, and the optimal pH value of adsorption was 9. Adsorption thermodynamics and kinetics results indicated that the adsorption process of phosphate was considered spontaneous, monolayer, and chemical sorption. MgO/ biochar was highly selective for phosphate through studying the adsorption effect of other anions on phosphate. This application of low-cost hemp stalk provides a suitable method for disposal and a high-value utilization of corresponding agricultural wastes.

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“…removal from water or wastewater such as anion exchange, sorption, chemical precipitation, membrane nanofiltration, reverse osmosis, electrodialysis and biological removal through constructed wetland, activated sludge and microalgal systems [4,5]. In practice, the most widely used methods are biological removal and chemical precipitation.…”

Section: Various Physical Chemical and Biological Methods Have Been mentioning

confidence: 99%

Removal of phosphate from aqueous solutions by adsorption onto Ca(OH) 2 treated natural clinoptilolite

Mitrogiannis

Psychoyou

Baziotis

et al. 2017

Chemical Engineering Journal

223

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Phosphorus (P) recovery from wastewater is of great interest especially when the loaded adsorbent can be used in the agriculture as slow-release fertilizer. The application depends on environmental concerns related to the chemical modification of the adsorbent and the release of toxic compounds from the loaded material to the soil or the water during adsorption. The present work focused on the phosphate (PO4-P) removal from aqueous solutions under low P concentrations (0.5-10 mg/L) by using Ca(OH)2-pretreated natural zeolite (CaT-Z). As activation agent, Ca(OH)2 presents benefits in terms of pretreatment costs and environmental impact of the applied adsorbent. The pretreatment of natural zeolite (clinoptilolite) with 0.25 mol/L Ca(OH)2 led to an increase of P removal from 1.7 to 97.6% at initial P concentration of 10 mg/L, pH 7 and 298 K. A significant reduction of the soluble reactive P was achieved with low residual concentrations of 81-238 μg P/L at 298 K rendering CaT-Z a promising sorbent for tertiary wastewater treatment. At 200 mg P/L, the adsorption capacity was 7.57 mg P/g CaT-Z. The P removal efficiency was pHindependent suggesting a beneficial use of CaT-Z under acidic and alkaline conditions. Adsorption was found to be an endothermic and slow process reaching equilibrium after 120 h, whereas the half of the PO4-P was adsorbed in the first 8 h. The applied kinetic models showed that both film and intraparticle diffusion contributed to phosphate removal. Phosphate sorption decreased in the presence of the anionic surfactant SDS, Fe 2+ , HCO3-, acetate and citrate anion. The predominant mechanisms of ligand exchange and CaP surface precipitation were confirmed by the IR-ATR and SEM-EDS analyses, respectively.

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Removal and slow release studies of phosphate on surfactant loaded hydrothermally synthesized silicate nanoparticles

Cited by 19 publications

References 28 publications

Modification of Sargassum angustifolium by molybdate during a facile cultivation for high-rate phosphate removal from wastewater: structural characterization and adsorptive behavior

Modification of Sargassum angustifolium by molybdate during a facile cultivation for high-rate phosphate removal from wastewater: structural characterization and adsorptive behavior

Strong Immobilization of Phosphate in Wastewater onto the Surface of MgO-Modified Industrial Hemp-Stem-Driven Biochar by Flowerlike Crystallization

Removal of phosphate from aqueous solutions by adsorption onto Ca(OH) 2 treated natural clinoptilolite

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