Cinética y Mecanismos de Adsorción de Plomo (II) Usando Zeolita Gis-NaP Obtenida a Partir de Residuos de Ladrillo  <span class="so-article-trans-title" dir="auto"> Translated title: Kinetics and Adsorption Mechanisms of Lead (II) Using Gis-NaP Zeolite Obtained from Brick Waste </span>

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Abstract

Resumen: Este artículo reporta los resultados de una investigación efectuada para evaluar la cinética y mecanismos de adsorción de Pb2+ de una zeolita sintética del tipo Gis-NaP, que fue obtenida a partir de residuos de ladrillos y que fue caracterizada mediante diversas técnicas de análisis. El tratamiento de los resultados experimentales mostró que el modelo de pseudo-primer orden (R2 = 0,9983) describe mejor la cinética de adsorción. El mecanismo de adsorción de Pb2+ es mejor explicado por la isoterma de Freundlich que muestra ajuste perfecto (R2 = 0,980). Con un tiempo de contacto de 8 horas, se consigue la saturación del material zeolítico alcanzando una adsorción de 109,8 mg/g de Pb2+. La máxima capacidad de adsorción 124,4 mg/g (95,1%) se obtuvo para una concentración inicial de 872,0 mg/L. Según los resultados obtenidos, se concluye que la zeolita Gis-NaP tiene una alta eficiencia de remoción de Pb2+ y que se puede aplicar en el tratamiento de efluentes mineros y/o industriales.

Translated abstract

Abstract: This article reports the results of an investigation carried out to evaluate the kinetics and adsorption mechanisms of Pb2+, of a synthetic zeolite of the Gis-NaP type that was obtained from brick residues and that was characterized by various analysis techniques. Treatment of the experimental results showed that the pseudo-first order model (R2 = 0,9983) better describes the adsorption kinetics. The Pb2 + adsorption mechanism is better explained by the Freundlich isotherm which shows perfect fit (R2 = 0,980). With a contact time of 8 hours, the saturation of the zeolitic material is achieved, reaching an adsorption of 109,8 mg/g of Pb2+. The maximum adsorption capacity 124,4 mg/g (95,1%) was obtained for an initial concentration of 872,0 mg/L. According to the results obtained, it is concluded that the Gis-NaP zeolite has a high removal efficiency of Pb2+ and that it can be applied in the treatment of mining and / or industrial effluents.

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Removal of Pb( ii ) and Cd( ii ) from wastewater using arginine cross-linked chitosan–carboxymethyl cellulose beads as green adsorbent

Kaiser Manzoor, Mudasir Ahmad, Suhail Ahmad … (2019)

A one pot approach has been explored to synthesize crosslinked beads from chitosan (CS) and carboxymethyl cellulose (CM) using arginine (ag) as a crosslinker. The synthesized beads were characterized by FTIR, SEM, EDX, XRD, TGA and XPS analysis. The results showed that CS and CM were crosslinked successfully and the obtained material (beads) was analyzed for adsorption of Cd(ii) and Pb(ii) by using batch adsorption experiments; parameters such as temperature, contact time, pH and initial ion concentration were studied. Different kinetic and thermodynamic models were used to check the best fit of the adsorption data. The results revealed that the kinetics data of the adsorption of Pb(ii) and Cd(ii) ions shows the best fit with the pseudo second order model whereas the thermodynamics data shows the best fit with the Langmuir isotherm with maximum adsorption capacities of 182.5 mg g−1 and 168.5 mg g−1 for Pb(ii) ions Cd(ii) ions, respectively. For the recovery and the regeneration after the one use of the beads, several adsorption–desorption cycles were carried out to check the reusability and recovery of both the metal ion and the adsorbent without the loss of maximum adsorption efficiency.

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High and fast adsorption of Cd(II) and Pb(II) ions from aqueous solutions by a waste biomass based hydrogel

Mingyue Zhang, Quanyu Yin, Xiaoming Ji … (2020)

A waste biomass based hydrogel soybean residue-poly(acrylic acid) (SR–PAA) was prepared through a fast one-step reaction by UV radiation technology. SR–PAA was used to remove Cd(II) and Pb(II) ions from aqueous solutions. Effect of pH value, temperature, initial concentration, contact time, competitive ions in the solutions on metal ions adsorption and desorption/regeneration capacity of SR–PAA was discussed in detailed. It was found that the adsorption equilibrium was achieved within 20 min, and maximum adsorption for Cd(II) and Pb(II) ions were 1.43 and 2.04 mmol g−1, respectively. Besides, adsorption thermodynamic analysis indicates that the process of Cd(II) and Pb(II) ions adsorption was spontaneous, feasible and exothermic in nature. And experimental data fitted the pseudo-second-order and Freundlich isotherm model well. Moreover, XPS spectra analysis proves that the metal ions were adsorbed on SR–PAA due to the interaction of carboxyl, hydroxyl and amine with these ions as ionic bond, coordination bond and electrostatic interaction.