Solubility and Selectivity Effects of the Anion on the Adsorption of Different Heavy Metal Ions onto Chitosan

Weißpflog, Janek; Gündel, Alexander; Vehlow, David; Steinbach, Christine; Müller, Martin; Boldt, Regine; Schwarz, Simona; Schwarz, Dana

doi:10.3390/molecules25112482

Cited by 38 publications

(22 citation statements)

References 38 publications

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“…In addition, -OH and -NH 2 groups have strong reactivity, and specific groups can be introduced to enhance the adsorption of metal ions. The chelating property of chitosan has been used to adsorb metal ions, such as Mn 2+ , Hg 2+ , Pd 2+ , Cu 2+ , and Pb 2+ [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water

Jiang

et al. 2021

Molecules

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Chitosan is a kind of biodegradable natural polysaccharide, and it is a very promising adsorber material for removing metal ions from aqueous solutions. In this study, chitosan-based magnetic adsorbent CMC@Fe3O4 was synthesized by a one-step method using carboxymethyl chitosan (CMC) and ferric salts under relatively mild conditions. The Fe3O4 microspheres were formed and the core–shell structure of CMC@Fe3O4 was synthesized in the meantime, which was well characterized via SEM/TEM, XRD, VSM, FT-IR, thermo gravimetric analysis (TGA), XPS, size distribution, and zeta potential. The effects of initial arsenic concentration, pH, temperature, contact time, and ionic strength on adsorption quantity of inorganic arsenic was studied through batch adsorption experiments. The magnetic adsorbent CMC@Fe3O4 displayed satisfactory adsorption performance for arsenic in water samples, up to 20.1 mg/g. The optimal conditions of the adsorption process were pH 3.0, 30−50 °C, and a reaction time of 15 min. The adsorption process can be well described by pseudo-second-order kinetic model, suggesting that chemisorption was main rate-controlling step. The Langmuir adsorption model provided much higher correlation coefficient than that of Freundlich adsorption model, indicating that the adsorption behavior is monolayer adsorption on the surface of the magnetic adsorbents. The above results have demonstrated that chitosan-based magnetic adsorbent CMC@Fe3O4 is suitable for the removal of inorganic arsenic in water.

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Section: Introductionmentioning

confidence: 99%

One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water

Jiang

et al. 2021

Molecules

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“…Taking the same value for factor n and assuming similar absorption coefficients for Amide I band related to both hexanoylated and acetylated amino groups the total degree of acetylation DS% ACETYL, and hexanoylation DS% HEX can be analogously calculated (Equation ( 6)). DS% TOTAL = DS% ACETYL + DS% HEX = Q H-CHIT × n × 100 = X% ≥ 10% (6) (Assuming no trans-amidification (replacing acetyl by hexanoyl groups)) DS% FTIR-2 can be calculated by subtracting DS% ACETYL from DS% TOTAL according to Equation ( 7).…”

Section: Methodsmentioning

confidence: 99%

A Complementary and Revised View on the N-Acylation of Chitosan with Hexanoyl Chloride

et al. 2021

Self Cite

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The modification of the biobased polymer chitosan is a broad and widely studied field. Herein, an insight into the hydrophobization of low-molecular-weight chitosan by substitution of amino functionalities with hexanoyl chloride is reported. Thereby, the influence of the pH of the reaction media was investigated. Further, methods for the determination of the degree of substitution based on 1H-NMR, FTIR, and potentiometric titration were compared and discussed regarding their accuracy and precision. 1H-NMR was the most accurate method, while FTIR and the potentiometric titration, though precise and reproducible, underlie the influence of complete protonation and solubility issues. Additionally, the impact of the pH variation during the synthesis on the properties of the samples was investigated by Cd2+ sorption experiments. The adjusted pH values during the synthesis and, therefore, the obtained degrees of substitution possessed a strong impact on the adsorption properties of the final material.

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“…The degree to which an anion inhibits sorption of a cation depends on the constant of stability. Bivalent anions (e.g., CO3 2− and SO4 2− ) can have a greater inhibitory effect on metal sorption than monovalent anions (e.g., Cl − and NO3 − ) [56,57]. Cd was effectively removed with low dosages of poultry ash, which makes this adsorbent an attractive choice for treatment of wastewater highly contaminated with metals.…”

Section: Salinitymentioning

confidence: 99%

Section: Salinitymentioning

confidence: 99%

A Mineral By-Product from Gasification of Poultry Feathers for Removing Cd from Highly Contaminated Synthetic Wastewater

Gusiatin

Kumpienė

Janiszewska³

et al. 2020

Minerals

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Ash from poultry feather gasification was investigated as an adsorbent for Cd removal from synthetic wastewater under a range of operational conditions: initial pH (2–8) and salinity (8–38 mS/cm) of wastewater, ash dosage (2.5–50 g/L), Cd concentration (25–800 mg/L) and contact time (5–720 min). The ash was highly alkaline and had low surface area and micropores averaging 1.12 nm in diameter. Chemical/mineralogical analysis revealed a high content of P2O5 (39.9 wt %) and CaO (35.5 wt %), and the presence of calcium phosphate, hydroxyapatite and calcium. It contained only trace amounts of heavy metals, BTEX, PAHs and PCBs, making it a safe mineral by-product. Cd adsorption was described best with Langmuir and pseudo-second order models. At pH 5, an ash dosage of 5 g/L, 40 min contact time and 100 mg Cd/L, 99% of Cd was removed from wastewater. The salinity did not affect Cd sorption. The maximum adsorption capacity of Cd was very high (126.6 mg/g). Surface precipitation was the main mechanism of Cd removal, possibly accompanied by ion exchange between Cd and Ca, coprecipitation of Cd with Ca-mineral components and Cd complexation with phosphate surface sites. Poultry ash effectively removes high concentrations of toxic Cd from wastewater.

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Solubility and Selectivity Effects of the Anion on the Adsorption of Different Heavy Metal Ions onto Chitosan

Cited by 38 publications

References 38 publications

One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water

One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water

A Complementary and Revised View on the N-Acylation of Chitosan with Hexanoyl Chloride

A Mineral By-Product from Gasification of Poultry Feathers for Removing Cd from Highly Contaminated Synthetic Wastewater

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