Study of Pb (II) adsorption by Tannin Based Adsorbent from mangrove bark (Rhizopora mucronata)

Sudaryanto, Yohanes; Rachmawati, Dyna; Sianto, Martinus Edy

doi:10.1088/1742-6596/1858/1/012086

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…(Pang et al 2011;Jin et al 2017). There are a variety of adsorbents, including barks (Sudaryanto et al 2021), chitosan (Zhang et al 2021), nano-crystalline-cellulose (Tasrin et al 2020), mesoporous silica (Li et al 2021), activated carbon (Mojdeh et al 2010), and synthetic hydrogel (Zhao et al 2021), etc. Activated carbon is widely used because relatively large specific surface area and rich pore distribution (Sun et al 2013). Activated carbon can be divided into fibrous, granular, and powder form according to the appearance and shape.…”

Section: Introductionmentioning

confidence: 99%

Polyethyleneimine/activated carbon paper-based material for low-concentration hexavalent chromium removal

et al. 2022

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In this study, softwood pulp, activated carbon powder, and polyester fiber were prepared into activated carbon paper-based materials (ACPBM) by papermaking. Then the polyethyleneimine (PEI) is loaded on the activated carbon paper-based material by dipping to prepare a high-performance, green PEI/activated carbon composite paper-based adsorbent material (PPCA) to remove low concentrations of Cr(VI) in water. The surface characteristics of the ACPBM and PPCA were analyzed by SEM, EDX, BET, and FT-IR, which showed that PEI had been successfully loaded on the surface of ACPBM. It was found that when the impregnated PEI concentration is 1%, the adsorbent dosage is 3 g•L -1 , the contact time is 180 min, the concentration of initial Cr(VI) is 5 mg•L -1 , and the pH is 2, the maximum adsorption capacity for Cr(VI) can reach 1.58 mg•g -1 . The process of PPCA adsorption of Cr(VI) conformed to the Freundlich isotherm model and the quasi-second-order kinetic model, indicating that the adsorption is multi-molecular layer adsorption with the adsorption mechanism of ion exchange and electrostatic attraction. In adsorption thermodynamics, ΔH0>0, ΔG0<0, and ΔS0＞0, indicating that the process of adsorbing Cr(VI) by the 1%PPCA is an endothermic entropy increase reaction that can proceed spontaneously. This study shows that a green, recyclable, and degradable high-performance PPCA adsorbent has been prepared through traditional papermaking processes and physical impregnation methods, which has a significant removal effect on low-concentration hexavalent chromium ions and can be industrialized.

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Section: Introductionmentioning

confidence: 99%

Polyethyleneimine/activated carbon paper-based material for low-concentration hexavalent chromium removal

et al. 2022

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Adsorption behaviors and mechanisms of Cu2+, Zn2+ and Pb2+ by magnetically modified lignite

Ruan

Zhang

et al. 2022

Sci Rep

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The study aims to solve the problems of limited capacity and difficult recovery of lignite to adsort Cu2+, Zn2+ and Pb2+ in acid mine wastewater (AMD). Magnetically modified lignite (MML) was prepared by the chemical co-precipitation method. Static beaker experiments and dynamic continuous column experiments were set up to explore the adsorption properties of Cu2+, Zn2+ and Pb2+ by lignite and MML. Lignite and MML before and after the adsorption of heavy metal ions were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectrometer (FTIR). Meanwhile, the adsorption mechanisms of Cu2+, Zn2+ and Pb2+ by lignite and MML were revealed by combining the adsorption isotherm model and the adsorption kinetics model. The results showed that the pH, adsorbent dosage, temperature, initial concentration of heavy metal ions, and contact time had an influence on the adsorption of Cu2+, Zn2+ and Pb2+ by lignite and MML, and the adsorption processes were more in line with the Langmuir model. The adsorption kinetics experiments showed that the adsorption processes were jointly controlled by multiple adsorption stages. The adsorption of heavy metal ions by lignite obeyed the Quasi first-order kinetic model, while the adsorption of MML was chemisorption that obeyed the Quasi second-order kinetic model. The negative ΔG and positive ΔH of Cu2+ and Zn2+ indicated the spontaneous and endothermic nature reaction, while the negative ΔH of Pb2+ indicated the exothermic nature reaction. The dynamic continuous column experiments showed that the average removal rates of Cu2+, Zn2+ and Pb2+ by lignite were 78.00, 76.97 and 78.65%, respectively, and those of heavy metal ions by MML were 82.83, 81.57 and 83.50%, respectively. Compared with lignite, the adsorption effect of MML was better. As shown by SEM, XRD and FTIR tests, Fe3O4 was successfully loaded on the surface of lignite during the magnetic modification, which made the surface morphology of lignite coarser. Lignite and MML removed Cu2+, Zn2+ and Pb2+ from AMD in different forms. In addition, the adsorption process of MML is related to the O–H stretching vibration of carboxylic acid ions and the Fe–O stretching vibration of Fe3O4 particles.

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Polyethyleneimine/activated carbon paper-based material for low-concentration hexavalent chromium removal

Gao

Zhao

Wang

et al. 2022

Preprint

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In this study, softwood pulp, activated carbon powder, and polyester fiber were prepared into activated carbon paper-based materials (ACPBM) by papermaking. Then the polyethyleneimine (PEI) is loaded on the activated carbon paper-based material by dipping to prepare a high-performance, green PEI/activated carbon composite paper-based adsorbent material (PPCA) to remove low concentrations of Cr(VI) in water. The surface characteristics of the ACPBM and PPCA were analyzed by SEM, EDX, BET, and FT-IR, which showed that PEI had been successfully loaded on the surface of ACPBM. It was found that when the impregnated PEI concentration is 1%, the adsorbent dosage is 3 g·L-1, the contact time is 180 min, the concentration of initial Cr(VI) is 5 mg·L-1 , and the pH is 2, the maximum adsorption capacity for Cr(VI) can reach 1.58 mg·g-1. The process of PPCA adsorption of Cr(VI) conformed to the Freundlich isotherm model and the quasi-second-order kinetic model, indicating that the adsorption is multi-molecular layer adsorption with the adsorption mechanism of ion exchange and electrostatic attraction. In adsorption thermodynamics, ΔH0>0, ΔG0<0, and ΔS0＞0, indicating that the process of adsorbing Cr(VI) by the 1%PPCA is an endothermic entropy increase reaction that can proceed spontaneously. This study shows that a green, recyclable, and degradable high-performance PPCA adsorbent has been prepared through traditional papermaking processes and physical impregnation methods, which has a significant removal effect on low-concentration hexavalent chromium ions and can be industrialized.

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Study of Pb (II) adsorption by Tannin Based Adsorbent from mangrove bark (Rhizopora mucronata)

Cited by 3 publications

References 11 publications

Polyethyleneimine/activated carbon paper-based material for low-concentration hexavalent chromium removal

Polyethyleneimine/activated carbon paper-based material for low-concentration hexavalent chromium removal

Adsorption behaviors and mechanisms of Cu2+, Zn2+ and Pb2+ by magnetically modified lignite

Polyethyleneimine/activated carbon paper-based material for low-concentration hexavalent chromium removal

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