scholarly journals Highly Selective Copper Ion Imprinted Clay/Polymer Nanocomposites Designed by Visible Light Radical Photopolymerization

2018 ◽  
Author(s):  
Radhia Msaadi ◽  
Gorkem Yilmaz ◽  
Andrit Allushi ◽  
Sena Hamadi ◽  
Salah Ammar ◽  
...  
Keyword(s):  
Visible Light ◽  
Adsorption Capacity ◽  
Metal Ion ◽  
Copper Ions ◽  
Copper Ion ◽  
Maximum Adsorption Capacity ◽  
Imprinted Polymer ◽  
Isothermal Model ◽  
Ion Imprinted ◽  
Ion Imprinting

There is an urgent demand worldwide for the development of highly selective adsorbents and sensors of heavy metal ions and other organic pollutants. Within these environmental and public health frameworks, we are combining the salient features of clays and chelatant polymers to design selective metal ion adsorbents. Towards this end, the ion imprinting approach has been used to develop a novel nanohybrid material for the selective separation of Cu2+ ions in aqueous solution. The Cu2+-imprinted polymer/ montmorillonite nanocomposite (IIP/Mt) and non-imprinted polymer/montmorillonite nanocomposite (NIP/Mt) were prepared by radical photopolymerization process in the visible light. Ion imprinting was indeed important as the recognition of copper ions by IIP/Mt was significantly superior to that of NIP/Mt that is the nanocomposite synthesized in the same way but in the absence of Cu2+ ions. The adsorption process as batch study was investigated under the experimental condition affecting same parameters such as contact time, concentration of ions metals and pH. The adsorption capacity of Cu2+ ions is maximized at pH 5. Removal of Cu2+ ion achieved equilibrium within 15 minutes; the results obtained were found to be fitted by the pseudo-second order kinetics model. The equilibrium process was well described by the Langmuir isothermal model and the maximum adsorption capacity was found to be 23.6 mg/g.

scholarly journals Highly Selective Copper Ion Imprinted Clay/Polymer Nanocomposites Prepared by Visible Light Initiated Radical Photopolymerization

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 286 ◽  
Author(s):  
Radhia Msaadi ◽  
Gorkem Yilmaz ◽  
Andrit Allushi ◽  
Sena Hamadi ◽  
Salah Ammar ◽  
...  
Keyword(s):  
Visible Light ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Polymer Nanocomposites ◽  
Metal Ion ◽  
Copper Ions ◽  
Maximum Adsorption Capacity ◽  
Imprinted Polymer ◽  
Ion Imprinted ◽  
Ion Imprinting

There is an urgent demand worldwide for the development of highly selective adsorbents and sensors of heavy metal ions and other organic pollutants. Within these environmental and public health frameworks, we are combining the salient features of clays and chelatant polymers to design selective metal ion adsorbents. Towards this end, the ion imprinting approach has been used to develop a novel nanohybrid material for the selective separation of Cu2+ ions in an aqueous solution. The Cu2+-imprinted polymer/montmorillonite (IIP/Mt) and non-imprinted polymer/montmorillonite (NIP/Mt) nanocomposites were prepared by a radical photopolymerization process in visible light. The ion imprinting step was indeed important as the recognition of copper ions by IIP/Mt was significantly superior to that of NIP/Mt, i.e., the reference nanocomposite synthesized in the same way but in the absence of Cu2+ ions. The adsorption process as batch study was investigated under the experimental condition affecting same parameters such as contact time, concentration of metal ions, and pH. The adsorption capacity of Cu2+ ions is maximized at pH 5. Removal of Cu2+ ion achieved equilibrium within 15 min; the results obtained were found to be fitted by the pseudo-second-order kinetics model. The equilibrium process was well described by the Langmuir isothermal model and the maximum adsorption capacity was found to be 23.6 mg/g. This is the first report on the design of imprinted polymer nanocomposites using Type II radical initiators under visible light in the presence of clay intercalated with hydrogen donor diazonium. The method is original, simple and efficient; it opens up new horizons in the general domain of clay/polymer nanocomposites.

scholarly journals Synthesis of Copper and Lead ion Imprinted Polymer Submicron Spheres to Remove Cu2+ and Pb2+

2021 ◽  
Author(s):  
Yang Jiang ◽  
Bolin Tang ◽  
Pengfei Zhao ◽  
Man Xi ◽  
Yi Li
Keyword(s):  
Adsorption Capacity ◽  
Crosslinking Agent ◽  
Lead Ion ◽  
Maximum Adsorption Capacity ◽  
Ratio Analysis ◽  
Imprinted Polymer ◽  
Functional Monomers ◽  
Imprinted Polymers ◽  
Ion Imprinted ◽  
Bet Analysis

Abstract In this paper, methacrylic acid (MAA) and 4- vinyl pyridine (4-VP) as functional monomers, ethylene glycol two methyl acrylate (EGDMA) as crosslinking agent, isopropyl alcohol as the solvent, prepared the Cu(II)- and Pb(II)- imprinted polymers(IIPs) submicron spheres by precipitation polymerization. The presence/absence of the template ion in the preparation of the imprinted polymer was confirmed by EDX spectroscopy, and the structure of the particles was investigated using IR, SEM and BET analysis. From different components of crosslinker/monomer(C/M) ratio analysis, C/M at 1:3 was the optimal ratio for preparing IIPs. Atomic absorption spectroscopy (AAS) was characterized the imprinted polymers absorption behavior. The results show that the maximum adsorption capacity of Cu2+ and Pb2+ -imprinted polymer were 26.9mg﹒g−1 and 25.3mg﹒g−1, respectively. They also have good adsorption capacity and superior selectivity property for Cu2+ and Pb2+ in water, respectively. The selectivity factors (α) for Ni2+, Zn2+, Co2+ and Fe2+ were 16.5(Cu2+) and 12.1(Pb2+), 13.8(Cu2+) and 16.2(Pb2+), 10.8(Cu2+) and 10.1(Pb2+), 20.4(Cu2+) and 20.7(Pb2+), respectively. The regeneration experiment result demonstrates an excellent re-utilization property of these two type IIPs, after ten uses, the adsorption capacity can maintain above 60%.

Thermo-responsive ion imprinted polymer on the surface of magnetic carbon microspheres for identification and removal of low-concentrations of Cu2+

2018 ◽  
Vol 15 (5) ◽  
pp. 306 ◽  
Author(s):  
Weifeng Liu ◽  
Lei Qin ◽  
Zhuolin An ◽  
Lin Chen ◽  
Xuguang Liu ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Copper Ions ◽  
Selective Recognition ◽  
Infrared Spectrometry ◽  
Order Kinetic ◽  
Carbon Microspheres ◽  
Imprinted Polymer ◽  
Low Concentrations ◽  
Ion Imprinted ◽  
Magnetic Carbon

Environmental contextBecause of the multiple industrial applications of metals, contamination by metal ions is widespread and can at times endanger the environment and the health of human beings. We prepared ion-imprinted adsorbents to achieve selective recognition and smart separation of low-concentrations of copper ions from water. These smart imprinted materials have high potential for selective adsorption and removal of contaminant copper ions, particularly at very low concentrations. AbstractA temperature-responsive magnetic adsorbent (poly(N-propyl acrylamide) grafted magnetic carbon microspheres, Cu2+-IIP) was synthesised by ion imprinting technology for low concentration Cu2+ removal. Cu2+-IIP was prepared by using N-propyl acrylamide as a thermo-sensitive functional monomer, N,N-methylene-bis-acrylamide as a cross-linker and ammonium persulfate as an initiator. The morphologies and microstructures of samples were characterised by transmission electron microscopy, Fourier transform infrared spectrometry, thermogravimetry and vibrating sample magnetometry. Adsorption experiments were conducted in terms of kinetics, isotherms and selective recognition adsorption at low feed concentrations. Results indicate that Cu2+-IIP possesses good recognition selectivity and affinity for Cu2+, and can be separated from the treated solution quickly by applying an external magnetic field. The adsorption capacity towards Cu2+ depends on temperature and reaches a maximum value of 45.46 mg g−1 at 35 °C, higher than that of the non-imprinted polymer. The adsorption behaviour of Cu2+ on Cu2+-IIP can be well defined with both the pseudo-second-order kinetic model and Langmuir isotherm model. Cu2+-IIP performs good adsorption selectivity towards Cu2+ because the relative selectivity factors of Cu2+ with respect to Ni2+, Zn2+ and Cd2+ are 7.14, 7.60 and 6.77, respectively. The adsorption capacity of Cu2+-IIP remained 88.41 % after five cycles.

scholarly journals Selective and rapid removal of Mo(VI) from water using functionalized Fe3O4-based Mo(VI) ion-imprinted polymer

2020 ◽  
Author(s):  
Lang Wu ◽  
Zhengwei Luo ◽  
Hui Jiang ◽  
Zijian Zhao ◽  
Wenhua Geng
Keyword(s):  
Adsorption Capacity ◽  
Isotherm Model ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Ion Imprinted Polymer ◽  
Imprinted Polymer ◽  
Adsorption Selectivity ◽  
X Ray ◽  
Ion Imprinted ◽  
Adsorption Desorption

Abstract Fe3O4 nanoparticles-based magnetic Mo(VI) surface ion-imprinted polymer (Mo(VI)-MIIP) was elaborated employing 4-vinyl pyridine as a functional monomer. The adsorbent preparation was confirmed by Fourier-transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectrometry, X-ray diffraction, vibrating sample magnetometer, thermogravimetric analysis, and surface area analysis. Batch adsorption experiments displayed that the maximum adsorption capacity of Mo(VI)-MIIP was 296.40 mg g−1 at pH 3, while that of the magnetic non-imprinted polymer (MNIP) was only 147.10 mg g−1. The adsorption isotherm model was well-fitted by the Langmuir isotherm model. The adsorption experiments revealed that Mo(VI)-MIIP reached adsorption equilibrium within 30 min, and the kinetics data fitting showed that the pseudo-second-order kinetics model suitably described the adsorption process. Mo(VI)-MIIP exhibited an excellent adsorption selectivity to Mo(VI) in binary mixtures of Mo(VI)/Cr(VI), Mo(VI)/Cu(II), Mo(VI)/H2PO44-, Mo(VI)/Zn(II), and Mo(VI)/I–, with relative selectivity coefficients toward MNIP of 13.71, 30.27, 20.01, 23.53, and 15.89, respectively. After six consecutive adsorption-desorption cycles, the adsorption capacity of Mo(VI)-MIIP decreased by 9.5% (from 228.4 mg g−1 to 206.7 mg g−1 at initial Mo(VI) concentration of 250 mg L−1), demonstrating its reusability.

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.

Using of Sukary and Khlass Date Pits as a Bio-adsorbents for Adsorption of Lead and Copper Ions from Waste Water

2021 ◽  
Vol 37 (2) ◽  
pp. 302-307
Author(s):  
Abdulrahman G. Alhamzan
Keyword(s):  
Adsorption Capacity ◽  
Room Temperature ◽  
Copper Ions ◽  
Phoenix Dactylifera ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Palm Trees ◽  
Phoenix Dactylifera L ◽  
Temperature Equilibrium ◽  
Date Pits

In this study date pits of two types of date-palm trees (Phoenix Dactylifera L.), in Saudi Arabia were used as bio-sorbents for heavy metals (e.g. lead and copper) from aqueous solutions. Investigation of equilibrium time and the effect of different concentrations of metals were performed. Adsorption capacity of bio-sorbents increased when increasing concentration of metal ions. Maximum adsorption capacity at room temperature of Sukary date pits was 17.53 mg g-1 and 9.86 mg g-1 for lead and copper ions, respectively. Whereas, Khlass date pits showed maximum adsorption capacity at 14.1 mg g-1 and 7.91 mg g-1 for lead and copper ions, respectively at room temperature. Equilibrium isotherm models, (Langmuir and Freundlich models), were used for analysis of equilibrium experimental results. these models describe the experimental data well.

scholarly journals Preparation of Nitrosulfonated Humic Acid-based Ion-imprinted Polymer and Study on Its Adsorption Properties

2021 ◽  
Author(s):  
An Wang ◽  
Xiaoran Sun ◽  
Yinuo Yan ◽  
Simeng Bian ◽  
Kaili Fan ◽  
...  
Keyword(s):  
Humic Acid ◽  
Crosslinking Agent ◽  
Organic Polymer ◽  
Lead Ion ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Ion Imprinted Polymer ◽  
Imprinted Polymer ◽  
Ion Imprinted ◽  
Ion Imprinted Polymers

Abstract Ion imprinted polymer, a kind of high molecular organic polymer, which can separate and enrich various metal ions in water by changing the adsorption conditions. Used humic acid as raw materials, used HNO3 and H2SO4 as modifiers to synthesize nitrosulfonated humic acid, then used it as substrate, NIPAM as the functional monomer, Pb2+ as the template ion, MBA as the crosslinking agent, K2S2O8 and NaHSO3 as initiators to prepare lead ion imprinted polymers after cross-linking reaction. Used SEM, FT-IR, TG-DSC to characterize the obtained product, and explored the structure and performance of the product. The adsorption performance of IIPs (NSA/NIPAM) was studied by ultraviolet-visible spectrophotometry (UV-vis). The results show that the maximum adsorption capacity of IIPs (NSA/NIPAM) for Pb2+ is 81.33 mg/g, the optimal number of cycles of IIPs (NSA/NIPAM) is 10, In the presence of competing ions Cu2+ and Cd2+, selectivity coefficients are 18.04 (Pb2+/Cu2+) and 19.39 (Pb2+/Cd2+). The results of simulating the thermodynamic adsorption process of the polymers with Langmuir and Freundlich thermodynamic adsorption models show that the imprinted polymer conform to the second-order kinetic model and the Langmuir thermodynamic model, and belong to monolayer chemisorption.

scholarly journals Harnessing of Newly Tailored Poly (Acrylonitrile)-Starch Nanoparticle Graft Copolymer for Copper Ion Removal via Oximation Reaction

2021 ◽  
Author(s):  
khaled Mostafa ◽  
H. Ameen ◽  
A. Ebessy ◽  
A. El-Sanabary
Keyword(s):  
Experimental Data ◽  
Adsorption Capacity ◽  
Graft Copolymer ◽  
Adsorption Kinetics ◽  
Copper Ions ◽  
Copper Ion ◽  
Second Order ◽  
First Order ◽  
Pseudo Second Order ◽  
Pseudo First Order

Abstract Our recently tailored and fully characterized poly (AN)-starch nanoparticle graft copolymer having 60.1 G.Y. % was used as a starting substrate for copper ions removal from waste water effluent after chemical modification with hydroxyl amine via oximation reaction. This was done to change the abundant nitrile groups in the above copolymer into amidoxime one and the resultant poly (amidoxime) resin was used as adsorbent for copper ions. The resin was characterized qualitatively via rapid vanadium ion test and instrumentally by FT-IR spectra and SEM morphological analysis to confirm the presence of amidoxime groups. The adsorption capacity of the resin was done using the batch technique, whereas the residual copper ions content in the filtrate before and after adsorption was measured using atomic adsorption spectrometry. It was found that the maximum adsorption capacity of poly (amidoxime) resin was 115.2 mg/g at pH 7, 400ppm copper ions concentration and 0.25 g adsorbent at room temperature. The adsorption, kinetics and isothermal study of the process is scrutinized using different variables, such as pH, contact time, copper ion concentration and adsorbent dosage. Different kinetics models comprising the pseudo-first-order and pseudo-second-order have been applied to the experimental data to envisage the adsorption kinetics. It was found from kinetic study that pseudo-second-order rate equation was better than pseudo-first-order supporting the formation of chemisorption process. While, in case of isothermal study, the examination of calculated correlation coefficient (R2) values showed that the Langmuir model provide the best fit to experimental data than Freundlich one.

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