Phosphate Removal From Aqueous Solutions by Chitin and Chitosan in Flakes

Szymczyk, Paula; Filipkowska, Urszula; Jóźwiak, Tomasz; Kuczajowska-Zadrożna, Małgorzata

doi:10.15259/pcacd.21.21

Cited by 17 publications

(13 citation statements)

References 19 publications

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“…With pH increase, the number of protonated amine groups decreases, which has a negative impact on sorption effectiveness of anions. At high pH values, sorbent surface may gain a negative charge, owing to which it electrostatically repulses particles with a negative charge; this in turn inhibits their sorption (Szymczyk et al 2016 ). In the alkaline environment, the sorption effectiveness of anions may be additionally reduced by their competition with OH − ions for the sorption centers of chitosan.…”

Section: Resultsmentioning

confidence: 99%

Hydrogel chitosan sorbent application for nutrient removal from soilless plant cultivation wastewater

Jóźwiak

Mielcarek

Janczukowicz

et al. 2018

Environ Sci Pollut Res

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In this study, we determined the effectiveness of removal of nutrients (nitrates and orthophosphates) from greenhouse wastewaters (GW) using non-cross-linked chitosan (CHs) and chitosan cross-linked with epichlorohydrin (CHs-ECH) in the form of hydrogel beads. GW used in the study had the following parameters: N-NO3 621.1 mg/L, P-PO4 60.8 mg/L, SO42− 605.0 mg/L, Cl− 0.9 mg/L, Ca2+ 545.0 mg/L, Mg2+ 178.0 mg/L, K+ 482.0 mg/L, hardness 113° dH, and pH 6.2. The scope of the study included determination of the effect of pH on wastewater composition and effectiveness of nutrient sorption, analyses of nutrient sorption kinetics, and analyses of the effect of sorbent dose on percentage removal of nutrients from GW. CHs-ECH was able to sorb 79.4% of P-PO4 and 76.7% of N-NO3 from GW, whereas CHs to remove 92.8% of P-PO4 and 53.2% of N-NO3.Electronic supplementary materialThe online version of this article (10.1007/s11356-018-2078-z) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Hydrogel chitosan sorbent application for nutrient removal from soilless plant cultivation wastewater

Jóźwiak

Mielcarek

Janczukowicz

et al. 2018

Environ Sci Pollut Res

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“…The neutralization ability of husks is crucial when they are used in wastewater treatment plants [ 97 ]. Studies on the sorption capacity of phosphorus by chitin and chitosan flakes have also confirmed that the adsorption capacity depends on the amount of amino groups [ 98 ]. According to Table 24 , the maximum sorption capacity determined according to the Langmuir model was 6.64 g P/kg for chitosan and 2.09 g P/kg for chitin.…”

Section: Synthesized and Waste Materials And Their Modificationsmentioning

confidence: 99%

“…For chitosan, the optimum pH for the process is 4.0. However, due to the ability to neutralize the solution, a final pH of 6.75 can be obtained; thus, pH correction is not required after the adsorption process [ 98 ].…”

Section: Synthesized and Waste Materials And Their Modificationsmentioning

confidence: 99%

Reactive Materials in the Removal of Phosphorus Compounds from Wastewater—A Review

et al. 2020

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Modern technologies designed to treat wastewater containing phosphorus compounds are based on the processes of adsorption and precipitation. In addition, more environmentally friendly and cheaper materials are being sought to ensure greater conformity with overarching assumptions of green chemistry and sustainable development. Against that background, this paper offers a review and analysis of available information on the considered reactive materials that have the capacity to remove phosphorus from wastewater. These materials are categorised as natural (with a sub-division in line with the dominant sorption groups of Al/Fe or Ca/Mg), waste, or man-made. Notably, most studies on sorbents have been carried out in laboratory systems via experimentation under static conditions. Among the natural materials, opoka has the highest sorption capacity of 181.20 g P/kg, while red mud (in the waste material category) is most efficient at binding phosphorus with a level of 345.02 g P/kg. Finally, among the group of commercial materials, Rockfos® has the highest sorption capacity of 256.40 g P/kg. In addition, this paper recognises the effect of composition, pH, and physical properties on a reactive material’s capacity to absorb phosphorus, as well as the possibility for further potential use in the production of fertilisers.

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“…Similarly, the adsorption capacity of chitin at pH 1.30, 5.50 and 9.70 were 26.8, 20.1 (average) and 17.1 mg g -1 , respectively. The point of zero charge (pHpzc) of chitin is approximately 5.4-7.2 (Gonzalez-Davila and Millero, 1990;Khedr et al, 2012;Szymczyk et al, 2016). In the adsorption of RBG 6B dye on chitin, at pH values below the point of zero charge (pHpzc) (6.0), the chitin will have a net positive charge due to protonation of nitrogen-containing functional groups such as amines.…”

Section: Effect Of Solution Ph On the Responsementioning

confidence: 99%

Adsorption of Remazol Brillant Green 6B (RBG 6B) on chitin: process optimization using response surface methodology

2018

Global NEST Journal

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In the present study, the adsorption of Remazol Brillant Green 6B (RBG 6B) on chitin which characterized by BET, FTIR, XRD and SEM analysis was studied. Response surface methodology (RSM) was applied to determine interaction between solution pH, initial RBG 6B concentration and chitin dosage being individual variables and to optimize operating conditions. According to results of variance analysis (ANOVA), the second order polynomial model was statistically significant (P<0.0001) and coefficient of determination value (R2=0.98) was high. It was determined that dye removal efficiency increased when low solution pH and initial RBG 6B dye concentration and high chitin dosage were used. The maximum dye removal efficiency was obtained as 88% at solution pH of 3.0, initial RBG 6B concentration of 75 mg L-1 and chitin dosage of 5.0 g L-1. The isotherms and kinetics studies showed that Freundlich isotherm and pseudo-second-order kinetics model fitted well to the RBG 6B adsorption data.

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Phosphate Removal From Aqueous Solutions by Chitin and Chitosan in Flakes

Cited by 17 publications

References 19 publications

Hydrogel chitosan sorbent application for nutrient removal from soilless plant cultivation wastewater

Hydrogel chitosan sorbent application for nutrient removal from soilless plant cultivation wastewater

Reactive Materials in the Removal of Phosphorus Compounds from Wastewater—A Review

Adsorption of Remazol Brillant Green 6B (RBG 6B) on chitin: process optimization using response surface methodology

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