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Zhang H, Su L, Cheng C, Cheng H, Chang M, Liu F, Liu N, Oh K. A new type of calcium-rich biochars derived from spent mushroom substrates and their efficient adsorption properties for cationic dyes. Front Bioeng Biotechnol 2022; 10:1007630. [PMID: 36204471 PMCID: PMC9530940 DOI: 10.3389/fbioe.2022.1007630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 09/02/2022] [Indexed: 12/07/2022] Open
Abstract
Adsorption is commonly accepted as a most promising strategy in dye wastewater treatment, and the widespread use of adsorption emphasizes the need to explore low-cost but excellent adsorbents. Herein, a low-cost adsorbent (calcium-rich biochar) was developed, which was directly pyrolyzed from spent mushroom substate without any modification. This study evaluated the potential application of two calcium-rich biochars (GSBC and LSBC) derived from spent substrates of Ganoderma lucidum and Lentinus edodes, respectively. The effects of pyrolysis temperature on the calcium-rich biochars characteristics and their adsorption mechanism for cationic dyes (Malachite Green oxalate (MG) and Safranine T (ST)) were studied systematically. The increase in pyrolysis temperature from 350 to 750 °C led to an increase in both biochar ash, Ca content, and specific surface area, which made high-temperature biochars (GS750 and LS750) the superior adsorbents for cationic dyes. Batch adsorption results showed LS750 was more efficient to adsorb dyes than GS750 attributed to its higher Ca content and larger specific surface area. According to the Langmuir model, LS750 had high adsorption capacities of 9,388.04 and 3,871.48 mg g−1 for Malachite green and ST, respectively. The adsorption mechanism of dye MG could be attributed to pore filling, hydrogen bonding, electrostatic interaction, ion exchange, and π-π stacking, while ST adsorption mainly involved pore filling, electrostatic interaction, ion exchange, and π-π stacking. Attributed to their excellent adsorption performance, cheap source, and good reusability, biochars obtained from SMSs were very promising in dyeing wastewater treatment.
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Affiliation(s)
- Haibo Zhang
- College of Resources and Environment, Shanxi Agricultural University, Taigu, China
- State Key Laboratory of Sustainable Dryland Agriculture (in preparation), Shanxi Agricultural University, Shanxi, Taiyuan, China
- Shanxi Key Laboratory of Edible Fungi for Loess Plateau, Taigu, China
| | - Long Su
- College of Resources and Environment, Shanxi Agricultural University, Taigu, China
| | - Caiping Cheng
- College of Basic Science, Shanxi Agricultural University, Taigu, China
| | - Hongyan Cheng
- College of Resources and Environment, Shanxi Agricultural University, Taigu, China
- *Correspondence: Hongyan Cheng, ; Mingchang Chang,
| | - Mingchang Chang
- College of Food Science and Engineering, Shanxi Agricultural University, Taigu, China
- Collaborative Innovation Center of Advancing Quality and Efficiency of Loess Plateau Edible Fungi, Taigu, China
- *Correspondence: Hongyan Cheng, ; Mingchang Chang,
| | - Fenwu Liu
- College of Resources and Environment, Shanxi Agricultural University, Taigu, China
- State Key Laboratory of Sustainable Dryland Agriculture (in preparation), Shanxi Agricultural University, Shanxi, Taiyuan, China
| | - Na Liu
- College of Resources and Environment, Shanxi Agricultural University, Taigu, China
| | - Kokyo Oh
- Center for Environmental Science in Saitama, Kazo, Japan
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Development, characterization and In-vitro evaluation of guar gum based new polymeric matrices for controlled delivery using metformin HCl as model drug. PLoS One 2022; 17:e0271623. [PMID: 35901085 PMCID: PMC9333214 DOI: 10.1371/journal.pone.0271623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 07/05/2022] [Indexed: 11/30/2022] Open
Abstract
Currently, hydrogels are considered as ideal biomaterials due to their unique structure and characteristics that facilitates considerable hydrophilicity, swelling, drug loading and release. In this study, we report pH-responsive GG-MAA-AMPS hydrogel delivery system prepared via free radical polymerization technique. Hydrogels were loaded with Metformin HCl as a model drug. Hydrogels were characterized through Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). FTIR confirmed the successful crosslinking of reactants, hydrogel network formation and drug loading. TGA and DSC proved the higher thermal stability of reactants after crosslinking and drug loading. XRD analysis showed decrease in crystallinity of drug after loading into the hydrogels. SEM revealed smooth and glassy appearance of both loaded and unloaded hydrogels. Gel content was increased with increase in concentration of reactants. Drug entrapment was decreased by increasing concentration of GG and AMPS while MAA acted inversely. Hydrogels displayed pH-dependent swelling and drug release behavior being high at pH 6.8 and 7.4 while low at acidic pH (1.2). Oral tolerability in rabbits showed that hydrogels were safe without causing any hematological or histopathological changes in healthy rabbits. Based on the obtained results, GG-MAA-AMPS can be considered as potential carrier for metformin HCl as well as other hydrophilic drugs.
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Preparation and characterization of chitosan/AMPS/kaolinite composite hydrogels for adsorption of methylene blue. Polym Bull (Berl) 2021. [DOI: 10.1007/s00289-021-03970-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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4
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Chowdhury N, Solaiman, Roy CK, Firoz SH, Foyez T, Imran AB. Role of Ionic Moieties in Hydrogel Networks to Remove Heavy Metal Ions from Water. ACS OMEGA 2021; 6:836-844. [PMID: 33458534 PMCID: PMC7808157 DOI: 10.1021/acsomega.0c05411] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 12/11/2020] [Indexed: 03/31/2024]
Abstract
A variety of methods for removing heavy metal ions from wastewater have been developed but because of their low efficiency, further production of toxic sludge or other waste materials, high expense, and lengthy procedures, limited progress has been achieved to date. Polymeric hydrogel has been attracting particular attention for the effective removal of heavy metal ions from wastewater. Here, ionogenic polymeric hydrogels were prepared by free-radical copolymerization of a neutral acrylamide (AAm) monomer with an ionic comonomer in the presence of a suitable initiator and a cross-linker. Different types of ionic comonomers such as strongly acidic: 2-acrylamido-2-methylpropane sulfonic acid, weakly acidic: acrylic acid (AAc), and zwitterionic: 2-methacryloyloxy ethyl dimethyl-3-sulfopropyl ammonium hydroxide with varying amounts were incorporated into the poly(AAm) networks to fabricate the hydrogels. The heavy metal ions (Fe3+, Cr3+, and Hg2+) removal capacity of the fabricated hydrogels from an aqueous solution via electrostatic interactions, coordination bond formation, and a diffusion process was compared and contrasted. The poly(AAm) hydrogel containing weakly acidic AAc groups shows excellent removal capacity of heavy metal ions. The release and recovery of heavy metal ions from the hydrogel samples are also impressive. The compressive strength of hydrogels was found to be significantly high after incorporating heavy metal ions that will increase their potential applications in different sectors.
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Affiliation(s)
- Noman Chowdhury
- Department
of Chemistry, Faculty of Engineering, Bangladesh
University of Engineering and Technology, Dhaka 1000, Bangladesh
| | - Solaiman
- Department
of Chemistry, Faculty of Engineering, Bangladesh
University of Engineering and Technology, Dhaka 1000, Bangladesh
| | - Chanchal Kumar Roy
- Department
of Chemistry, Faculty of Engineering, Bangladesh
University of Engineering and Technology, Dhaka 1000, Bangladesh
| | - Shakhawat H. Firoz
- Department
of Chemistry, Faculty of Engineering, Bangladesh
University of Engineering and Technology, Dhaka 1000, Bangladesh
| | - Tahmina Foyez
- Department
of Pharmaceutical Sciences, School of Health and Life Sciences, North South University, Dhaka 1229, Bangladesh
| | - Abu Bin Imran
- Department
of Chemistry, Faculty of Engineering, Bangladesh
University of Engineering and Technology, Dhaka 1000, Bangladesh
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Fabrication of semi-interpenetrated PVA/PAMPS hydrogel as a reusable adsorbent for cationic methylene blue dye: isotherms, kinetics and thermodynamics studies. Polym Bull (Berl) 2020. [DOI: 10.1007/s00289-020-03456-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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6
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Safavi-Mirmahalleh SA, Salami-Kalajahi M, Roghani-Mamaqani H. Adsorption kinetics of methyl orange from water by pH-sensitive poly(2-(dimethylamino)ethyl methacrylate)/nanocrystalline cellulose hydrogels. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:28091-28103. [PMID: 32405949 DOI: 10.1007/s11356-020-09127-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 04/29/2020] [Indexed: 06/11/2023]
Abstract
A series of hydrogel nanocomposites was fabricated by in situ polymerization of 2-(dimethylamino)ethyl methacrylate (DMAEMA) in presence of different amounts of (amine- and alkyl-modified) nanocrystalline cellulose (NCC). Modification and nanocomposites properties were proved by different analysis methods such as Fourier-transform infrared spectroscopy (FT-IR), dynamic light scattering (DLS), and field emission scanning electron microscopy (FE-SEM). The new hydrogel nanocomposites were applied for removing methyl orange (MO) used as anionic dye and presented in process water at different pH values. The effects of the fabrication process such as modification and content of NCC, contact time, and pH value on swelling ratio (SR), and equilibrium adsorption kinetics were studied. Results showed that the swelling ratio of PDMAEMA-based nanocomposites varied with the different types of nanoparticles showing the significant effect of the modification process. The MO adsorption into the hydrogel nanocomposites was affected by intermolecular and electrostatic interactions between functional groups of hydrogel and dye. The adsorption capacity decreased at high pH value, and it was significantly affected type of nanoparticles introduced into the hydrogel network. The addition of unmodified NCC did not affect adsorption kinetics significantly. Finally, adsorption kinetics was investigated by pseudo-first-order, pseudo-second-order and intraparticle diffusion models where pseudo-first-order model showed the best correlation with experimental results.
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Affiliation(s)
- Seyedeh-Arefeh Safavi-Mirmahalleh
- Faculty of Polymer Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran
- Institute of Polymeric Materials, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran
| | - Mehdi Salami-Kalajahi
- Faculty of Polymer Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran.
- Institute of Polymeric Materials, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran.
| | - Hossein Roghani-Mamaqani
- Faculty of Polymer Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran.
- Institute of Polymeric Materials, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran.
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Integrated adsorption and catalytic degradation of safranine T by a porous covalent triazine-based framework. J Colloid Interface Sci 2018; 532:1-11. [DOI: 10.1016/j.jcis.2018.07.113] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Revised: 07/25/2018] [Accepted: 07/25/2018] [Indexed: 11/19/2022]
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9
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Babaladimath G, Badalamoole V. Pectin-graft-poly(2-acrylamido-2-methyl-1-propane sulfonic acid) silver nanocomposite hydrogel beads: evaluation as matrix material for sustained release formulations of ketoprofen and antibacterial assay. JOURNAL OF POLYMER RESEARCH 2018. [DOI: 10.1007/s10965-018-1592-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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10
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Babaladimath G, Badalamoole V. Magnetic nanoparticles embedded in pectin-based hydrogel for the sustained release of diclofenac sodium. POLYM INT 2018. [DOI: 10.1002/pi.5587] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Gangadhar Babaladimath
- Department of Post-Graduate Studies and Research in Chemistry; Mangalore University; Mangalagangothri, Karnataka India
| | - Vishalakshi Badalamoole
- Department of Post-Graduate Studies and Research in Chemistry; Mangalore University; Mangalagangothri, Karnataka India
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11
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Atta AM, Al-Lohedan HA, Tawfeek AM, Ahmed MA. In situ
preparation of magnetic Fe3
O4
.Cu2
O.Fe3
O4
/cryogel nanocomposite powder via a reduction-coprecipitation method as adsorbent for methylene blue water pollutant. POLYM INT 2018. [DOI: 10.1002/pi.5582] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ayman M Atta
- Surfactants research chair, Chemistry Department; College of Science, King Saud University; Riyadh Saudi Arabia
| | - Hamad A Al-Lohedan
- Surfactants research chair, Chemistry Department; College of Science, King Saud University; Riyadh Saudi Arabia
| | - Ahmed M Tawfeek
- College of science; King Saud University; Riyadh Saudi Arabia
| | - Mona A Ahmed
- Petroleum Application Department; Egyptian Petroleum Research Institute; Cairo Egypt
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12
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Nagarpita M, Roy P, Shruthi S, Sailaja R. Synthesis and swelling characteristics of chitosan and CMC grafted sodium acrylate-co-acrylamide using modified nanoclay and examining its efficacy for removal of dyes. Int J Biol Macromol 2017; 102:1226-1240. [DOI: 10.1016/j.ijbiomac.2017.04.099] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 04/25/2017] [Accepted: 04/26/2017] [Indexed: 10/19/2022]
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13
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Fan ZZ, Wang JG, Zhang LF, Zhan NN, He GJ. A Novel Hyperbranched Phase Transporter for Extraction of Water-soluble Dyes in Industrial Wastewater. J CHIN CHEM SOC-TAIP 2016. [DOI: 10.1002/jccs.201600726] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zhen Zhong Fan
- Department of Petroleum engineering; Northeast Petroleum University; Daqing 163318 PR China
| | - Ji Gang Wang
- Department of Petroleum engineering; Northeast Petroleum University; Daqing 163318 PR China
| | - Li Feng Zhang
- Department of Chemistry; Zhejiang University; No. 38, Zheda Road Hangzhou 310027 PR China
| | - Ning Ning Zhan
- CNOOC Energy Technology & Service Limited-Drilling & Production Co.; Tianjin 300450 PR China
| | - Gui Jin He
- Department of Chemistry; Zhejiang University; No. 38, Zheda Road Hangzhou 310027 PR China
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14
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Removal of safranine T and brilliant cresyl blue dyes from water by carboxy methyl cellulose incorporated acrylic hydrogels: Isotherms, kinetics and thermodynamic study. J Taiwan Inst Chem Eng 2016. [DOI: 10.1016/j.jtice.2015.10.021] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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15
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Zhang M, Wang R, Xiang T, Zhao WF, Zhao CS. Preparation, characterization and application of poly(sodium p-styrenesulfonate)/poly(methyl methacrylate) particles. J IND ENG CHEM 2016. [DOI: 10.1016/j.jiec.2015.12.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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16
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17
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Ying H, He G, Zhang L, Lei Q, Guo Y, Fang W. Hyperbranched polyglycerol/poly(acrylic acid) hydrogel for the efficient removal of methyl violet from aqueous solutions. J Appl Polym Sci 2015. [DOI: 10.1002/app.42951] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hao Ying
- Department of Chemistry; Zhejiang University; 38 Zheda Road Hangzhou 310027 People's Republic of China
| | - Guijin He
- Department of Chemistry; Zhejiang University; 38 Zheda Road Hangzhou 310027 People's Republic of China
| | - Lifeng Zhang
- Department of Chemistry; Zhejiang University; 38 Zheda Road Hangzhou 310027 People's Republic of China
| | - Qunfang Lei
- Department of Chemistry; Zhejiang University; 38 Zheda Road Hangzhou 310027 People's Republic of China
| | - Yongsheng Guo
- Department of Chemistry; Zhejiang University; 38 Zheda Road Hangzhou 310027 People's Republic of China
| | - Wenjun Fang
- Department of Chemistry; Zhejiang University; 38 Zheda Road Hangzhou 310027 People's Republic of China
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18
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Saikia AK, Aggarwal S, Mandal UK. Electrically induced swelling and methylene blue release behaviour of poly (N-isopropylacrylamide-co-acrylamido-2-methylpropyl sulphonic acid) hydrogels. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3719-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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The enhanced removal of cationic dyes in binary system using novel copolymers with two kinds of acidic groups. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.03.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Oyetade OA, Nyamori VO, Martincigh BS, Jonnalagadda SB. Effectiveness of carbon nanotube–cobalt ferrite nanocomposites for the adsorption of rhodamine B from aqueous solutions. RSC Adv 2015. [DOI: 10.1039/c4ra15446k] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Magnetic cobalt ferrite–carbon nanotube nanocomposites are effective and reusable adsorbents for remediation of wastewaters contaminated with dyes.
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Affiliation(s)
- Oluwaseun A. Oyetade
- School of Chemistry and Physics
- University of KwaZulu-Natal
- Durban 4000
- South Africa
| | - Vincent O. Nyamori
- School of Chemistry and Physics
- University of KwaZulu-Natal
- Durban 4000
- South Africa
| | - Bice S. Martincigh
- School of Chemistry and Physics
- University of KwaZulu-Natal
- Durban 4000
- South Africa
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Controlled release of highly water-soluble antidepressant from hybrid copolymer poly vinyl alcohol hydrogels. Polym Bull (Berl) 2013. [DOI: 10.1007/s00289-013-1043-8] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Evren M, Acar I, Güçlü K, Güçlü G. Removal of Cu2+and Pb2+ions byN-vinyl 2-pyrrolidone/itaconic acid hydrogels from aqueous solutions. CAN J CHEM ENG 2013. [DOI: 10.1002/cjce.21814] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Mümin Evren
- Faculty of Engineering, Chemical Engineering Department; Istanbul University, Avcılar; Istanbul 34320 Turkey
| | - Işıl Acar
- Faculty of Engineering, Chemical Engineering Department; Istanbul University, Avcılar; Istanbul 34320 Turkey
| | - Kubilay Güçlü
- Faculty of Engineering, Chemistry Department; Istanbul University, Avcılar; Istanbul 34320 Turkey
| | - Gamze Güçlü
- Faculty of Engineering, Chemical Engineering Department; Istanbul University, Avcılar; Istanbul 34320 Turkey
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Deng S, Xu H, Jiang X, Yin J. Poly(vinyl alcohol) (PVA)-Enhanced Hybrid Hydrogels of Hyperbranched Poly(ether amine) (hPEA) for Selective Adsorption and Separation of Dyes. Macromolecules 2013. [DOI: 10.1021/ma302330w] [Citation(s) in RCA: 122] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Shujun Deng
- School of Chemistry & Chemical Engineering, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
| | - Hongjie Xu
- School of Chemistry & Chemical Engineering, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
| | - Xuesong Jiang
- School of Chemistry & Chemical Engineering, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
| | - Jie Yin
- School of Chemistry & Chemical Engineering, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
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Parasuraman D, Serpe MJ. Poly (N-isopropylacrylamide) microgels for organic dye removal from water. ACS APPLIED MATERIALS & INTERFACES 2011; 3:2732-7. [PMID: 21682294 DOI: 10.1021/am2005288] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The ability of poly (N-isopropylacrylamide) (pNIPAm), and pNIPAm-co-acrylic acid (pNIPAm-co-AAc) microgels to remove an organic azo dye molecule, 4-(2-Hydroxy-1-naphthylazo) benzenesulfonic acid sodium salt (Orange II) from aqueous solutions at both room and elevated temperature was assessed. At room temperature, we found that the amount of Orange II removed from water (removal efficiency) increased with increasing AAc and microgel concentration. The removal of Orange II from water was also fit by a Langmuir sorption isotherm model. Furthermore, we found the extent of Orange II removal depended on solution temperature; more Orange II was removed from water at elevated temperature and as the microgels were held at that temperature for longer durations of time. Additionally, by increasing the cycles between high and ambient temperature, the removal of Orange II was enhanced, although this was only true for two temperature cycles. We hypothesize that this is a result of the thermoresponsive nature of pNIPAm-based microgels which deswell at elevated temperature expelling their solvating water and when the microgels are cooled back down they reswell with the Orange II containing water. We also hypothesize that the microgels become saturated after the second heating cycle and so the efficiency of removal did not increase further. Finally, we assessed the ability of the microgels to retain the Orange II after it is removed from the aqueous solution. We determined that the microgels "leak" 25.6% of the Orange II that was originally removed from the water.
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25
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Karadağ E, Kundakci S, Üzüm ÖB. Investigation of Swelling/Sorption Characteristics of Highly Swollen AAm/AMPS Hydrogels and Semi IPNs with PEG as Biopotential Sorbent. ACTA ACUST UNITED AC 2011. [DOI: 10.4236/jeas.2011.11002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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26
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Özkahraman B, Acar I, Emik S. Removal of cationic dyes from aqueous solutions with poly (N-isopropylacrylamide-co-itaconic acid) hydrogels. Polym Bull (Berl) 2010. [DOI: 10.1007/s00289-010-0371-1] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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