Chitosan-based hydrogel and chitosan/acid-activated montmorillonite composite hydrogel for the adsorption and removal of Pb+2 and Ni+2 ions accommodated in aqueous solutions

Vieira, Ricardo Mancilio; Vilela, Pâmela Becalli; Becegato, Valter Antônio; Paulino, Alexandre Tadeu

doi:10.1016/j.jece.2018.04.018

Cited by 87 publications

(23 citation statements)

References 38 publications

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“…Meanwhile, the optimal mass ratio of ingredient for heavy metal adsorption was A 1 C 1 B 1 , namely the mass ratio of CTS to SA is 1:7; the mass ratio of CTS to SA is 1:1; mass fraction of BT is 2%. Under these conditions, the adsorption capacities of hydrogels for Pb 2+ , Cu 2+ and Cd 2+ reached up to 434.89, 115.30 and 102.38 mg·g −1 , respectively, which were greater than other physical hydrogels and clay-polymer nanocomposite [ 32 , 40 , 41 , 42 ].…”

Section: Resultsmentioning

confidence: 96%

“…The best ratio of chitosan, sodium alginate and bentonite for Pb 2+ , Cu 2+ and Cd 2+ adsorption is 3:7:10. The adsorption capacity reached up to 434.89, 115.30 and 102.38 mg·g −1 for Pb 2+ , Cu 2+ and Cd 2+ , respectively, which were greater than other physical hydrogels and clay-polymer nanocomposite [ 32 , 40 , 41 , 42 ]. In the pH range of 1~5, the optimum pH for adsorption is five, and the adsorption capacities decreased with the decrease of pH.…”

Section: Discussionmentioning

confidence: 92%

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Preparation of Chitosan/Calcium Alginate/Bentonite Composite Hydrogel and Its Heavy Metal Ions Adsorption Properties

et al. 2021

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In order to avoid the secondary pollution of the toxic residue of chemical crosslinking agent accompanied by chemical hydrogel adsorbent and enhance the adsorption performance of physical hydrogel, chitosan/calcium alginate/bentonite (CTS/CA/BT) composite physical hydrogel was constructed. The formation mechanism and structure of the composite hydrogel were determined by FTIR, XRD and SEM. Adsorption performances of the hydrogel toward Pb2+, Cu2+ and Cd2+ in water under different condition as well as multi-ion competitive sorption were investigated. The adsorption processes were described with the canonical adsorption kinetics and isotherms models. With the utilization of XPS analysis and adsorption thermodynamics analysis, it was found that the adsorptions were spontaneous physico-chemical adsorptions. The results showed that the maximum adsorption capacity of the hydrogel for Pb2+, Cu2+ and Cd2+ reached up to 434.89, 115.30 and 102.38 mg·g−1, respectively, better than those of other physical hydrogels or chitosan/bentonite composite. Moreover, the composite hydrogel improved the collectability of bentonite and showed a good reusability. The modification of bentonite and the formation of hydrogel were completed simultaneously, which greatly simplifies the operation process compared with the prior similar works. These suggest that the CTS/CA/BT composite hydrogel has promising application prospects for removal of heavy metal ions from water.

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Section: Resultsmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 92%

Preparation of Chitosan/Calcium Alginate/Bentonite Composite Hydrogel and Its Heavy Metal Ions Adsorption Properties

et al. 2021

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“…The Sips model is ideal for describing heterogeneous surface adsorption surfaces adequately [40]. When the exponent n s = 1 the adsorption followed the Langmuir isotherm whereas if n > 1 the experimental data fit the Freundlich isotherm more [41]. In this work n is approximately 1 and is thus a monolayer adsorption.…”

Section: Resultsmentioning

confidence: 99%

“…This isotherm proposes an empirical formula with three parameters, it is a hybrid of the Langmuir and Freundlich isotherm, it is more effective in describing adsorption on heterogeneous surfaces [40,41]. At different sorbate concentrations, it reduces to either the Freundlich isotherm or the Langmuir isotherm [40,41,53]. The Linear equation that represents the Sips equation is Equation (7) [53].…”

Section: Methodsmentioning

confidence: 99%

Application of Response Surface Methodology and Desirability Function in the Optimization of Adsorptive Remediation of Arsenic from Acid Mine Drainage Using Magnetic Nanocomposite: Equilibrium Studies and Application to Real Samples

2019

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A magnetic multi-walled carbon nanotube/zeolite nanocomposite was applied for the adsorption and removal of arsenic ions in simulated and real acid mine drainage samples. The adsorption mechanism was investigated using two-parameter (Langmuir, Freundlich, Temkin) and three-parameter (Redlich–Peterson, and Sips) isotherm models. This was done in order to determine the characteristic parameters of the adsorptive removal process. The results showed that the removal process was described by both mono- and multilayer adsorptions. Adsorption studies demonstrated that a multi-walled carbon nanotube/zeolite nanocomposite could efficiently remove arsenic in simulated samples within 35 min. Based on the Langmuir isotherm, the adsorption capacity for arsenic was found to be 28 mg g−1. The nanocomposite was easily separated from the sample solution using an external magnet and the regeneration was achieved by washing the adsorbent with 0.05 mol L−1 hydrochloric acid solution. Moreover, the nanoadsorbent was reusable for at least 10 cycles of adsorption-desorption with no significant decrease in the adsorption capacity. The nanoadsorbent was also used for the arsenic removal from acid mine drainage. Overall, the adsorbent displayed excellent reusability and stability; thus, they are promising nanoadsorbents for the removal of arsenic from acid mine drainage.

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“…Una estrategia para la formación de un innovador hidrogel compósito se basó en la generación de hidrogeles de quitosano acoplados con estos minerales. Este tipo de hidrogel compósito exhibió propiedades mecánicas, ópticas y de hinchamiento extraordinarias (Vieira, Vilela, Becegato & Paulino, 2018), indicando una capacidad de absorción del Cr (VI) de 96 mg/g.…”

Section: Hidrogeles Compósitos Para La Adsorción De Iones De Metales unclassified

Compósitos en estado hidrogel con aplicación en la adsorción de metales pesados presentes en aguas residuales

et al. 2020

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La contaminación por metales pesados es un problema, que hoy en día no se ha logrado disminuir. Por esta razón, es necesario innovar constantemente las técnicas tradicionales con el fin de aplicar procesos eficientes que ayuden a remover los contaminantes e incluso recuperarlos para ser reincorporados a procesos productivos. En este contexto, la adsorción es una técnica tan versátil, que es viable su aplicación con materiales de diferentes características. Entre los materiales que han resultado adsorbentes eficientes, se encuentran las partículas inorgánicas y los polímeros/biopolímeros. Estos componentes por si solos presentan capacidades adsorbentes aceptables, pero en los últimos años se ha explorado la generación de matrices poliméricas en estado hidrogel reforzadas con materiales inorgánicos o mezclas de redes poliméricas generando compósitos, para mejorar o incrementar la capacidad de adsorción. Los hidrogeles compósitos conjugan una adsorción eficaz, buena área superficial específica y de fácil aplicabilidad, por lo que representan una gran alternativa para la disminución de los iones de metales pesados presentes en los ecosistemas acuáticos. Por este motivo, es la presente revisión de los materiales con propiedades adsorbentes, las estrategias para generar compósitos en estado hidrogel y sus propiedades adaptadas para la adsorción de iones de metales pesados, así como los retos y las áreas de oportunidad implícitos en esta generación de materiales innovadores.

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Chitosan-based hydrogel and chitosan/acid-activated montmorillonite composite hydrogel for the adsorption and removal of Pb+2 and Ni+2 ions accommodated in aqueous solutions

Cited by 87 publications

References 38 publications

Preparation of Chitosan/Calcium Alginate/Bentonite Composite Hydrogel and Its Heavy Metal Ions Adsorption Properties

Preparation of Chitosan/Calcium Alginate/Bentonite Composite Hydrogel and Its Heavy Metal Ions Adsorption Properties

Application of Response Surface Methodology and Desirability Function in the Optimization of Adsorptive Remediation of Arsenic from Acid Mine Drainage Using Magnetic Nanocomposite: Equilibrium Studies and Application to Real Samples

Compósitos en estado hidrogel con aplicación en la adsorción de metales pesados presentes en aguas residuales

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