Removal of anionic and cationic dyes with bioadsorbent oxidized chitosans

León, Orietta; Muñoz‐Bonilla, Alexandra; Soto, Diana; Pérez, Daniela; Rangel, Medarda; Colina, Marínela; Fernández‐García, Marta

doi:10.1016/j.carbpol.2018.04.072

Cited by 102 publications

(27 citation statements)

References 60 publications

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“…The swelling ratio (SR) was tested at 37 ± 1 °C in 0.1 M HCl (pH = 1.2) based on the expression [ 32 ]: SR = W S − W 0 /W 0 × 100 where W 0 —microparticles weight, W S —swollen microparticles weight.…”

Section: Methodsmentioning

confidence: 99%

Calcium Chloride Modified Alginate Microparticles Formulated by the Spray Drying Process: A Strategy to Prolong the Release of Freely Soluble Drugs

et al. 2018

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Alginate (ALG) cross-linking by CaCl2 is a promising strategy to obtain modified-release drug delivery systems with mucoadhesive properties. However, current technologies to produce CaCl2 cross-linked alginate microparticles possess major disadvantages, such as a poor encapsulation efficiency of water-soluble drugs and a difficulty in controlling the process. Hence, this study presents a novel method that streamlines microparticle production by spray drying; a rapid, continuous, reproducible, and scalable technique enabling obtainment of a product with low moisture content, high drug loading, and a high production yield. To model a freely water-soluble drug, metformin hydrochloride (MF) was selected. It was observed that MF was successfully encapsulated in alginate microparticles cross-linked by CaCl2 using a one-step drying process. Modification of ALG provided drug release prolongation—particles obtained from 2% ALG cross-linked by 0.1% CaCl2 with a prolonged MF rate of dissolution of up to 12 h. Cross-linking of the ALG microparticles structure by CaCl2 decreased the swelling ratio and improved the mucoadhesive properties which were evaluated using porcine stomach mucosa.

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Section: Methodsmentioning

confidence: 99%

Calcium Chloride Modified Alginate Microparticles Formulated by the Spray Drying Process: A Strategy to Prolong the Release of Freely Soluble Drugs

et al. 2018

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“…The maximum adsorption capacities for both dyes using modified Mg/Cr LDH were higher than those using pristine Mg/Cr LDH. According to Leon et al [28], the higher content of available carboxylic groups promotes electrostatic interactions between the sorbate and sorbent. summarized in Tables 5 and 6.…”

Section: Resultsmentioning

confidence: 99%

Mg-Cr Layered Double Hydroxide with Intercalated Oxalic Anion for Removal Cationic Dyes Rhodamine B and Methylene Blue

2020

J. Environ. Treat. Tech.

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A MgCr-based layered double hydroxide (LDH) was synthesized by a coprecipitation method, followed by an intercalation process using an oxalic anion. The materials were characterized using X-ray diffraction analysis, FT-IR spectroscopy, and pH pzc measurement. The materials were then applied as adsorbents for removal of methylene blue (MB) and rhodamine B (RhB) from aqueous solution. Pristine Mg/Cr LDH exhibited RhB adsorption capacity of 32.154 mg g⁻1, whereas the use of intercalated Mg/Cr LDH caused an increase in the capacity (139.526 mg g⁻1). Kinetic studies indicated that the dye adsorption using both LDHs followed a pseudo-second-order kinetic model; the K2 values of pristine and modified Mg/Cr LDH for RhB and MB were 6.970, 0.001, 0.426, and 2.056 g mg⁻1 min⁻1, respectively. The thermodynamic study identified that the adsorption of both dyes onto the LDHs was a spontaneous process and can be classified as physical adsorption with adsorption energies of <40 kJ/mol. Moreover, the desorption and regeneration experiments indicated the high economic feasibility and reusability of the LDHs. By using HCl as the optimal solvent, the LDHs could desorb as much as 98% of the dye and could be used as adsorbents with high adsorption capacity over three cycles.

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“…A similar finding was reported by Leon et al (2018). The author concluded that when the desorption process in an acidic medium 54 ; the hydrogen bonding at the interlayer was damaged. This causes the effectiveness of Cu/Al and Cu/Cr adsorption to decrease.…”

Section: Recycled Adsorbent Effectivitymentioning

confidence: 99%

Adsorption Study of Malachite Green Removal from Aqueous Solution Using Cu/M3+ (M3+=Al, Cr) Layered Double Hydroxide

Palapa¹,

Mohadi²,

Rachmat³

et al. 2020

Mediterr.J.Chem.,

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Layered double hydroxide (LDH) Cu/Al and Cu/Cr had been used as adsorbent of malachite green (MG) in aqueous solution. The properties of Cu/Al and Cu/Cr LDHs were analyzed by X-ray diffraction, surface area analysis (BET) and FTIR spectroscopy. Adsorption study of MG was achieved at pH 9. Adsorption of MG follows the pseudo-second-order kinetic model. Langmuir isotherm was suitable for adsorption of MG on both LDH with a maximum adsorption capacity of 59.52 mg/g. The thermodynamic study indicated that the adsorption process is physisorption, spontaneous, and endothermic process. Adsorption of MG onto LDHs involve the acid-base interaction between adsorbent and adsorbate.

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Removal of anionic and cationic dyes with bioadsorbent oxidized chitosans

Cited by 102 publications

References 60 publications

Calcium Chloride Modified Alginate Microparticles Formulated by the Spray Drying Process: A Strategy to Prolong the Release of Freely Soluble Drugs

Calcium Chloride Modified Alginate Microparticles Formulated by the Spray Drying Process: A Strategy to Prolong the Release of Freely Soluble Drugs

Mg-Cr Layered Double Hydroxide with Intercalated Oxalic Anion for Removal Cationic Dyes Rhodamine B and Methylene Blue

Adsorption Study of Malachite Green Removal from Aqueous Solution Using Cu/M3+ (M3+=Al, Cr) Layered Double Hydroxide

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