scholarly journals Synthesis and Swelling Behaviors of Hydrogels Containing LiMA Groups and its Use in Cu(II) Adsorption from Aqueous Solution

2021 ◽  
Vol 12 (3) ◽  
pp. 3618-3637
Keyword(s):  
Ethylenediaminetetraacetic Acid ◽  
Copper Ions ◽  
Swelling Kinetics ◽  
Batch Adsorption ◽  
Adsorption Method ◽  
Ionic Groups ◽  
Mercaptosuccinic Acid ◽  
Crosslinker Concentration ◽  
Kinetics Of ◽  
Swelling Behaviors

In this paper, cerium sulfate tetrahydrate (Ce(IV)) dissolved in acid-aqueous medium and mercaptosuccinic acid (MSA) redox couple was used to synthesize the crosslinked copolymer of acrylamide (AAm), lithium methacrylate (LiMA), and N,N’-methylene bisacrylamide (MBAAm) in the presence of ethylenediaminetetraacetic acid tetrasodium salt (EDTANa4). The effects of various mole amounts of AAm and LiMA at constant crosslinker concentration and mole amounts of total monomer/MBAAm at constant amounts of AAm and LiMA on the swelling behaviors and swelling kinetics of synthesized hydrogels were investigated in distilled water. The use of hydrogel, including lithium methacrylate ionic groups, for the removal of copper ions from aqueous solutions was examined by using the batch adsorption method. In the adsorption process of copper ions on hydrogels containing LiMA groups, the effects of parameters such as the amount of hydrogel, initial Cu(II) concentration, adsorption time, and pH of solution were investigated.

scholarly journals Transition Metal (II) Complexes of (E)-N-(4-methylbenzylidene)-2-((Z)-(4-methylbenzylidene)amino)benzamides: Synthesis, Characterization and their Biological Evaluation

2021 ◽  
Vol 12 (3) ◽  
pp. 3607-3617
Keyword(s):  
Ethylenediaminetetraacetic Acid ◽  
Copper Ions ◽  
Biological Evaluation ◽  
Swelling Kinetics ◽  
Batch Adsorption ◽  
Adsorption Method ◽  
Ionic Groups ◽  
Mercaptosuccinic Acid ◽  
Crosslinker Concentration ◽  
Kinetics Of

In this paper, cerium sulfate tetrahydrate (Ce(IV)) dissolved in acid-aqueous medium and mercaptosuccinic acid (MSA) redox couple was used to synthesize the crosslinked copolymer of acrylamide (AAm), lithium methacrylate (LiMA), and N,N’-methylene bisacrylamide (MBAAm) in the presence of ethylenediaminetetraacetic acid tetrasodium salt (EDTANa4). The effects of various mole amounts of AAm and LiMA at constant crosslinker concentration and mole amounts of total monomer/MBAAm at constant amounts of AAm and LiMA on the swelling behaviors and swelling kinetics of synthesized hydrogels were investigated in distilled water. The use of hydrogel, including lithium methacrylate ionic groups, for the removal of copper ions from aqueous solutions was examined by using the batch adsorption method. In the adsorption process of copper ions on hydrogels containing LiMA groups, the effects of parameters such as the amount of hydrogel, initial Cu(II) concentration, adsorption time, and pH of solution were investigated.

scholarly journals Adsorption Kinetics of Arsenic (V) on Nanoscale Zero-Valent Iron Supported by Activated Carbon

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1791
Author(s):  
Huijie Zhu ◽  
Mingyan Shi ◽  
Xiuji Zhang ◽  
Bo Liu ◽  
Dahu Yao
Keyword(s):  
Activated Carbon ◽  
Adsorption Kinetics ◽  
Negative Impact ◽  
Zero Valent Iron ◽  
Batch Adsorption ◽  
Adsorption Method ◽  
Factors Affecting ◽  
Adsorbent Dosage ◽  
Nanoscale Zero Valent Iron ◽  
Kinetics Of

The presence of arsenic (As) in drinking water is of serious concern due to its negative impact on human health. This work reports on the kinetics of nanoscale zero-valent iron (Fe0) supported by activated carbon (NZVI/AC) for the removal of As (V) species from aqueous solutions. To better understand the factors affecting this process, we investigated the effects of various experimental parameters including initial As (V) concentration, adsorbent dosage, pH, temperature, and coexisting ions on the adsorption kinetics using a batch-adsorption method. The optimum conditions for As (V) removal by NZVI/AC were found to be: 318 K, pH 3.5, an adsorbent dosage of 1.5 g/L, and an equilibrium time of 72 h. A greater mass of NZVI/AC, lower concentration of As (V) and lower pH positively promoted adsorption kinetics. The presence of phosphate (PO43−) and silicate (SiO42−) markedly inhibited As (V) removal kinetics. However, in the presence of 4.5 g/L NZVI/AC, ≥99.9% of As (V) was removed from raw groundwater.

scholarly journals Release of toxic methylene blue from water by mesoporous silicalite-1: characterization, kinetics and isotherm studies

2021 ◽  
Vol 11 (7) ◽  
Author(s):  
Sabarish Radoor ◽  
Jasila Karayil ◽  
Aswathy Jayakumar ◽  
Jyotishkumar Parameswaranpillai ◽  
Suchart Siengchin
Keyword(s):  
Electron Microscopy ◽  
Contact Time ◽  
Dye Removal ◽  
Batch Adsorption ◽  
Aqueous Environment ◽  
Order Kinetic ◽  
Adsorption Method ◽  
X Ray ◽  
Ft Ir ◽  
Adsorption Desorption

AbstractIn the present work, we have developed a mesoporous silicalite-1 using CMC as a template for the removal of MB from aqueous solution. The synthesized silicalite-1 were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Energy-dispersive X-ray spectroscopy (EDAX) and N2 adsorption–desorption isotherm (BET). XRD and FT-IR analysis confirmed the formation of crystallinity and development of MFI structure in the mesoporous silicalite-1. The adsorption of MB dye on mesoporous silicalite-1 was conducted by batch adsorption method. The effect of various parameters such as adsorbent dosage, initial dye concentration, contact time and temperature on the dye uptake ability of silicalite-1 was investigated. The operating parameters for the maximum adsorption are silicalite-1 dosage (0.1 wt%), contact time (240 min), initial dye concentration (10 ppm) and temperature (30 ℃). The MB dye removal onto mesoporous silicalite-1 followed pseudo-second-order kinetic and Freundlich isotherm. The silicalite-1 exhibits 86% removal efficiency even after six adsorption–desorption cycle. Therefore, the developed mesoporous silicalite-1 is an effective eco-friendly adsorbent for MB dye removal from aqueous environment.

scholarly journals Polyelectrolyte Gels: A Unique Class of Soft Materials

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 102
Author(s):  
Ferenc Horkay
Keyword(s):  
Exchange Process ◽  
Interaction Strength ◽  
Soft Materials ◽  
Industrial Applications ◽  
Future Research ◽  
Swelling Kinetics ◽  
Polyelectrolyte Gels ◽  
Ion Exchange Process ◽  
Counter Ions ◽  
Kinetics Of

The objective of this article is to introduce the readers to the field of polyelectrolyte gels. These materials are common in living systems and have great importance in many biomedical and industrial applications. In the first part of this paper, we briefly review some characteristic properties of polymer gels with an emphasis on the unique features of this type of soft material. Unsolved problems and possible future research directions are highlighted. In the second part, we focus on the typical behavior of polyelectrolyte gels. Many biological materials (e.g., tissues) are charged (mainly anionic) polyelectrolyte gels. Examples are shown to illustrate the effect of counter-ions on the osmotic swelling behavior and the kinetics of the swelling of model polyelectrolyte gels. These systems exhibit a volume transition as the concentration of higher valence counter-ions is gradually increased in the equilibrium bath. A hierarchy is established in the interaction strength between the cations and charged polymer molecules according to the chemical group to which the ions belong. The swelling kinetics of sodium polyacrylate hydrogels is investigated in NaCl solutions and in solutions containing both NaCl and CaCl2. In the presence of higher valence counter-ions, the swelling/shrinking behavior of these gels is governed by the diffusion of free ions in the swollen network, the ion exchange process and the coexistence of swollen and collapsed states.

scholarly journals Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 63
Author(s):  
Maria Harja ◽  
Gabriela Buema ◽  
Nicoleta Lupu ◽  
Horia Chiriac ◽  
Dumitru Daniel Herea ◽  
...  
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Copper Ions ◽  
Synthetic Wastewater ◽  
Bet Surface Area ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Copper Adsorption ◽  
X Ray

Fly ash/magnetite material was used for the adsorption of copper ions from synthetic wastewater. The obtained material was characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) surface area, and vibrating sample magnetometer (VSM). Batch adsorption experiments were employed in order to investigate the effects of adsorbent dose, initial Cu (II) concentration and contact time over adsorption efficiency. The experimental isotherms were modeled using Langmuir (four types of its linearization), Freundlich, Temkin, and Harkins–Jura isotherm models. The fits of the results are estimated according to the Langmuir isotherm, with a maximum adsorption capacity of 17.39 mg/g. The pseudo-second-order model was able to describe kinetic results. The data obtained throughout the study prove that this novel material represents a potential low-cost adsorbent for copper adsorption with improved adsorption capacity and magnetic separation capability compared with raw fly ash.

scholarly journals Removal of Cadmium(II) from Water using Modified Citrus limettioides Peels: Thermodynamic and Isotherm Studies

2019 ◽  
Vol 32 (1) ◽  
pp. 73-78
Author(s):  
P. Janaki ◽  
R. Sudha ◽  
T.S. Sribharathi ◽  
P. Anitha ◽  
K. Poornima ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Low Cost ◽  
Raw Material ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Adsorption Method ◽  
Chemically Modified ◽  
Adsorption Performance ◽  
Monolayer Adsorption ◽  
Isotherm Equations

The adsorption performance of sulphuric acid treated low cost adsorbent synthesized by using Citrus limettioides peel as an effective raw material for the removal of cadmium(II) from water. The batch adsorption method was carried out to optimize some parameters like contact time, pH and adsorbent dose. The nonlinear isotherm equations were used to calculate the different isotherm constant of five isotherm models namely Freundlich, Langmuir, Dubinin-Radushkevich, Redlich-Peterson and Sips. The Langmuir monolayer adsorption capacity of chemically modified Citrus limettioides peel was found to be 287.60 mg g-1. The negative values of ΔGº and ΔHº showed that the adsorption process is spontaneous and exothermic.

The Swelling Kinetics Study of Hydrogels Prepared by the Different Finesses Degrees of Eupatorium Adenophorum

2013 ◽  
Vol 690-693 ◽  
pp. 1615-1619
Author(s):  
Hai Bo Wen ◽  
Xin Gao ◽  
Heng Zhang
Keyword(s):  
Water Uptake ◽  
Graft Copolymerization ◽  
Raw Materials ◽  
Low Cost ◽  
Granule Size ◽  
Swelling Kinetics ◽  
Kinetics Study ◽  
Eupatorium Adenophorum ◽  
Differential Model ◽  
Swelling Behaviors

In this study the different finesses degree of the pulverized Eupatorium Adenophorum (EA) was evaluated as potential raw materials for the low-cost hydrogels whose the swelling behaviors were compared and studied at the same graft-copolymerization condition. The results are shown that the absorbency of EA hydrogels increased with decreasing the granule size of pulverized EA from 0.450mm to 0.063mm, while the swelling ratios gradually decreased with continuously reducing the particles size to 0.020mm, and the swelling exponents have been found to indicate non-Fickian mechanism for EA hydrogels at the all finesses range of 0.020~0.450mm. Moreover, to obtain better model for above 60% water uptake, the Beren-Hopfenberg differential model was applied, which also enabled to calculate the relaxation constants.

scholarly journals Removal of Cu(II) from wastewater by waste tire rubber ash

2010 ◽  
Vol 75 (6) ◽  
pp. 845-853 ◽  
Author(s):  
Hassan Mousavi ◽  
Abdorrahman Hosseinifar ◽  
Vahdat Jahed
Keyword(s):  
Copper Ions ◽  
Low Cost ◽  
Batch Adsorption ◽  
Tire Rubber ◽  
Freundlich Isotherms ◽  
Waste Tire ◽  
Waste Tire Rubber ◽  
Wastewater Samples ◽  
The Cost ◽  
Influence Of Ph

The influence of pH, adsorbent dose, initial Cu(II) concentration and contact time on the removal of Cu(II) from aqueous solution by the batch adsorption technique using waste tire rubber ash as a low-cost adsorbent was investigated. The adsorption equilibrium was achieved after 2 h at pH 4-6, the optimum for the adsorption of Cu(II) ions. A dose of 1.5 g/L of adsorbent was sufficient for the optimum removal of copper ions. The experimental data were analyzed by the Langmuir and Freundlich isotherms and the corresponding sorption constants were evaluated. The adsorption kinetics data were fitted by a first-order equation. The cost of removal is expected to be quite low, as the adsorbent is cheap and easily available in large quantities. The present study showed that waste tire rubber ash was capable of removing copper ions from industrial wastewater samples.

Curing and swelling kinetics of new magnetorheological elastomer based on natural rubber/waste natural rubber gloves composites

2018 ◽  
Vol 51 (7-8) ◽  
pp. 583-602
Author(s):  
Nabil Hayeemasae ◽  
Hanafi Ismail
Keyword(s):  
Natural Rubber ◽  
Material Properties ◽  
Swelling Kinetics ◽  
Curing Process ◽  
Magnetorheological Elastomer ◽  
Rubber Composites ◽  
Rubber Waste ◽  
New Type ◽  
Kinetics Of ◽  
Single Filler

This article proposes a new type of magnetorheological elastomer (MRE) based on natural rubber (NR) and waste natural rubber gloves (wNRg) blends. The material properties of the MRE samples were investigated with specific focus on the curing and swelling kinetics. Two different series were prepared; the first used carbonyl iron (CI) as the single filler in the MRE, whereas the second hybridized CI with carbon black (CB) to prepare an MRE resistant to solvents. The results show that most properties depend strongly on the nature of both fillers. The higher thermal conductivity of the CI caused a substantial decrease in both the scorch and curing times and the activation energy in the curing process. Based on the diffusion study, a higher volume of fillers in the rubber composites resulted in a greater area of blockage and restricted the penetration of the solvent tested throughout the composites, irrespective of whether CI alone or in combination with CB was used in the composites.

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