COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xiaomin Tang,Ting Huang,Shixin Zhang,Wei Wang,Huaili Zheng
Hematite wastewater containing dissolved heavy metals is a potential threat to eco-environment and human health. Flocculation as an efficient and cost effective water treatment technology should be applied in its treatment. A sulfonated chitosan-based flocculant (CS-g-P(AM-AMPS)) was prepared via graft copolymerization. Two synthesis pathways and reaction products with different molecular structure were discovered in processes. CS-g-P(AM-AMPS) possessed the multifarious functional groups that contributed to its excellent performance in hematite wastewater treatment. Bridging, adsorption and entrapment in coagulation-flocculation were enhanced due to CS-g-P(AM-AMPS), and the impressive floc size and high removal efficiency were represented in the treatment as well. Dissolved heavy metals in the wastewater were removed by the chelation of sulfonate group in CS-g-P(AM-AMPS), the adsorption of other functional groups and the co-settlement with flocs. CS-g-P(AM-AMPS) will have the potential application in industrial wastewater treatment for its high flocculation performance, thermal stability and solubility.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 39
·e202203264
·
IF 2.307
Hongzhi Zhao,Bin Chen,Xiaoyue Zhang,Yan Xiong,Ming Duan
Graphical When the DPMOH 2 content in P(AM-DPMOH 2 ) exceeded 40 wt%, M η of P(AM-DPMOH 2 ) was higher than 5.0×10 5 g/mol, molecular weight of PEI in BPEI was larger than 3000 g/mol, the content of phenylboronic acid groups in BPEI was more than 39.3 %, and the pH was in the range of 8–10, the thickening composite system can be formed by P(AM-DPMOH 2 ) and BPEI in water. When the pH was in the range of 7–8, intramolecular crosslinking of P(AM-DPMOH 2 ) was dominant and the viscosity was decreased. When the pH was smaller than 7, the boronic ester bond was hydrolyzed and the thickening effect lost. : The construction of composite flooding system based on dynamic covalent bonds is one of the effective methods to improve the salt and temperature resistance of polymer flooding agents. The polymers used in most composite systems are xanthan gum and guar gum. In this paper, a novel multi-hydroxyl polymer was synthesized, and a new composite system was constructed based on the dynamic boronic ester bonds. Firstly, the multi-hydroxyl polymer P(AM-DPMOH 2 ) was prepared by aqueous solution copolymerization of acrylamide (AM) and a dihydroxy monomer 2,3-dihydroxy-N-(3-methacrylamidopropyl)-N,N-dimethylpropan-1-aminium (DPMOH 2 ), which was obtained by quaternization reaction between 3-chloro-1,2-propanediol and N-(3-dimethylaminopropyl). Then, the composite system was prepared by the P(AM-DPMOH 2 ) solution and polyboronic acid compound (BPEI). The effects of DPMOH 2 content in P(AM-DPMOH 2 ), molecular weight of P(AM-DPMOH 2 ), molecular weight of BPEI, phenylboronic acid groups content in BPEI and pH on the formation of thickening composite system were investigated. The results showed that when the content of DPMOH 2 in P(AM-DPMOH 2 ) exceeded 40 wt%, viscosity average molecular weight of P(AM-DPMOH 2 ) was higher than 5.0×10 5 g/mol, the molecular weight of PEI in BPEI was larger than 3000 g/mol, the content of phenylboronic acid groups in BPEI was more than 39.3 %, and pH was in the range of 8–9, the thickening composite system can be formed by P(AM-DPMOH 2 ) and BPEI. In addition, both the temperature and salt resistance of the composite system formed by 3000 mg/L P(AM-DPMOH 2 ) and 2000 mg/L BPEI was much better than that of 3000 mg/L P(AM-DPMOH 2 ). The results of this paper provide a new finding of how to construct a composite flooding system with dynamic covalent bonds.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Ziqi Xu,Jiaqi Liu,Jiajun Wang,Wen Li,Fang Wang
In the present work, self-adhesive and self-healing drug loaded poly(hydroxyethyl methacrylate-acrylamide)/gelatin hydrogels with dual networks were synthesized by a facile one-pot method via crosslinking with dynamic hydrogen bonds and metal–ligand interactions. The prepared hydrogels displayed excellent cyclic adhesion performance on various surfaces due to the presence of Fe3+ ions and tannic acid (TA). Notably, due to the uniform compact pore size distribution, the prepared P(HEMA-AM)/Gel0.9 hydrogel possessed enhanced physicochemical properties, with a tensile strength of 305 kPa and an elongation at break of 589% in tensile experiments, and a compressive strength of 1.11 MPa under 70% strain. At the same time, the self-healing efficiency of the P(HEMA-AM)/Gel0.9 hydrogel can reach 95% after 24 h of repair. Furthermore, drug release experiments showed that the hydrogels had pH-responsive and sustained drug release properties, and the addition of gelatin in the composite hydrogel would accelerate drug release. Therefore, the P(HEMA-AM)/Gel hydrogel fabricated with a convenient and simple method possesses great potential for use in drug delivery systems.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Bin Li,Aolin Wu,Mengjing Zhou,Ying Wang,Zhigang Hu,Lihua Su
In this paper, nitrogen-doped carbon quantum dots (N-CQDs) were prepared by using citric acid as a carbon source and ethylenediamine as a nitrogen source. Then, N-CQDs were added into a deep eutectic solvent (DES) synthesized from acrylamide (AM), urea (U), and choline chloride (ChCl). The N-CQDs/P(AM-U-ChCl) composite hydrogels were prepared by light polymerization. The chemical composition and microstructure of N-CQDs/P(AM-U-ChCl) composite hydrogels were characterized in detail using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). This article further explored the influence of the content of N-CQDs on the mechanical properties, adsorption properties, and detection performance of the composite hydrogel. The results showed that the composite hydrogels exhibited the best mechanical properties when N-CQDs' content was 0.3 wt%. The adsorption performance of N-CQDs/P(AM-U-ChCl) composite hydrogels for Fe3+ was significantly enhanced due to the carboxyl groups contained in N-CQDs. In detecting tert-butylhydroquinone (TBHQ), the composite hydrogel showed a good linear correlation in the concentration range of 0–200 mg L−1, and the detection limit of TBHQ reached 0.849 mg L−1. This study provides a new idea for preparing composite hydrogel materials with excellent mechanical properties and functionality. Also, it demonstrates their potential application value in heavy metal ion adsorption and organic molecule detection.
研究领域:
材料科学
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环境科学
·
分析化学
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产品关联
DOI
高影响因子
Membranes
·
2025
·Vol. 15
·期 2
·42
·
IF 3.6
Jihao Zuo,Mengkang Lu,Jinting Cai,Ruopeng Lan,Xinjuan Zeng,Cailong Zhou
The discharge of large volumes of textile dyeing wastewater, characterized by poor biodegradability and high toxicity, poses severe threats to the environment. In this study, polyvinylidene difluoride (PVDF) membranes were prepared using the nonsolvent-induced phase separation (NIPS) method, with porous amino-functionalized mesoporous silica nanoparticles (Am-MSNs) mixed into the casting solution to fabricate the Am-MSN/PVDF mixed matrix membranes. By varying the amount of Am-MSNs added, the microstructure and overall performance of the membranes were comprehensively analyzed. The results demonstrated that the addition of Am-MSNs significantly enhanced the hydrophilicity of the membranes. The high specific surface area and amino groups of Am-MSNs facilitated interactions with dye molecules, such as Reactive Black 5 (RB5), through hydrogen bonding, electrostatic attraction, and physical adsorption, resulting in a marked improvement in RB5 rejection rates. Static adsorption tests further validated the superior adsorption capacity of the Am-MSN/PVDF mixed matrix membranes for RB5. Additionally, the nanoscale mesoporous structure of Am-MSNs enhanced the mechanical strength of the membranes. The synergistic effects of the mesoporous structure and amino groups significantly increased the efficiency and stability of the Am-MSN/PVDF mixed matrix membranes in dye removal applications, providing an effective and sustainable solution for the treatment of dye-contaminated wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Zhijie Shang,Pan Xu,Meiling Yao,Kaifan He,Guoxuan Li,Xinxue Li
Synthesis of acrylamide-based polymers with excellent stability is crucial for oilfield applications. In this study, a novel modified silica nanoparticle (MSiO2) obtained by a two-step N-acylation reaction was used as a functional monomer to enhance the stability of poly(acrylic acid (AA)/2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS)/acrylamide (AM)) ternary polymer (NSPM). A novel poly(MSiO2/AA/AMPS/AM) quaternary copolymer (MSPM) was obtained in this manner. The microstructure of MSPM was characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). The rheological properties of the MSPM were investigated based on the apparent viscosity in different salinities, temperatures, and shear rates. The MSPM exhibited improved stability compared with NSPM when the MSiO2 content was within the range of 0.14–0.20 wt %. This enhancement may be associated with hydrogen-bond-mediated intermolecular associations and MSiO2-centered branched or locally cross-linked structures formed during polymerization. Furthermore, the application of MSPM to gelation experiment showed that the grafting of MSiO2 effectively improved the gel strength of the polymer and prolonged its gel stabilization time from 10 to 14 days. The results of molecular dynamics simulation (MDS) demonstrate that the addition of MSiO2 effectively enhances the interaction between water and MSPM gel, which explains the fact that MSiO2 can reduce the dehydration rate of the MSPM gel.
✓ 已验证
DOI
高影响因子
POLYMER BULLETIN
·
2011
·Vol. 67
·期 1
·141-158
·
IF 1.215
An Huiyong,Lu Cuige,Wang Pixin,Li Wenbo,Tan Ying,Xu Kun,Liu Chang
A novel hydrophobically associating polyampholytes of poly(AM/AA/AMQC12) were synthesized by the free radical copolymerization of acrylamide (AM), acrylic acid (AA), and dimethyldodecyl(2-acrylamidoethyl)ammonium bromide (AMQC12) in water without any surfactants (named AAQ series). The structures of polymers were confirmed by 1 H NMR and 13 C NMR. The molecular weight and polydispersity were obtained using gel permeation chromatography (GPC). The hydrophobically associated properties of polymer solution were characterized by rheology, steady-state fluorescence probe, and 1 H NMR relaxation time ( T
2 ). Isoelectric points (IEPs) of polymer solution were determined by the effect of pH on viscosity below critical association concentrations (cac), and the reduced viscosities of samples at IEPs were increased in the presence of NaCl. Moreover, the steady-shear viscosity of sample at IEP was also greatly enhanced in NaCl solutions when the polymer concentration is above the cac. Meantime, the storage modulus and the loss modulus of copolymers showed that the sample behaved as gel in salt media.
研究领域:
高分子化学
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材料科学
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产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-9
·
IF 2.584
Ge Yuru,Li Yushu,Zu Baiyi,Zhou Chaoyu,Dou Xincun
Complex multiphase waste system purification, as one of the major challenges in many industrial fields, urgently needs an efficient one-step purification method to remove several pollutants simultaneously and efficiently. Multi-functionalized magnetic nanoparticles, Fe 3 O 4 @SiO 2 -MPS-AM-DMC-AMPS, were facilely prepared via a one-pot in situ polymerization of three different functional monomers, AM, DMC, and AMPS, on a Fe 3 O 4 @SiO 2 -MPS core-shell structure. The multi-functionalized magnetic nanoparticles (MNPs) are proven to be a highly effective purification agent for oilfield wastewater, an ideal example of industrial complex multiphase waste system containing cations, anions, and organic pollutants. Excellent overall removal efficiencies for both cations, including K + , Ca 2+ , Na + , and Mg 2+ of 80.68 %, and anions, namely Cl − and SO 4
2− , of 85.18 % along with oil of 97.4 % were shown. The high removal efficiencies are attributed to the effective binding of the functional groups from the selected monomers with cations, anions, and oil emulsions.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Yiming Zhou,Shiyu Fu,Liangliang Zhang,Huaiyu Zhan
Superabsorbents based on carboxylated cellulose nanofibrils (CCNFs) and carboxymethyl cellulose-g-poly(acrylic acid-co-acrylamide) were synthesized. A series of experiments were performed to evaluate the influence of factors such as CCNFs amount, solution pH, temperature, salt solution type and concentration on the swelling behaviors of the hydrogels. The water uptake of the hydrogels strongly depended on the CCNF content, the swelling capacity in distilled water increased dramatically from 245.8 to 458.7 g/g with the addition of CCNFs up to 2.5 wt%. Furthermore, the incorporation of CCNFs improved salt resistance properties of the hydrogels with slower deswelling rate and higher water retention capacity at deswelling equilibrium. Besides, the CCNF nanocomposite hydrogels presented better responsive behavior in relation to pH presence and showed an increase in water retention capacity at various temperatures. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) were employed to examine the structure and morphologies of the prepared superabsorbent hydrogels.
研究领域:
材料科学
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化学工程
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 301
·期 5
·445-453
·
IF 2.4
Li Bin,Hao Wenrui,Xu Xiaojia,Liu Jizhen,Fu Dandan,Zhou Mengjing,Hu Zhigang
Choline chloride (ChCl) was used as the hydrogen bond acceptor (HBA) and acrylic acid (AA) and acrylamide (AM) as the hydrogen bond donor (HBD), and the three materials were mixed in a certain molar ratio to obtain deep eutectic solvent (DES). Subsequently, P(IA-co-AA-co-AM) composite hydrogels were prepared by adding itaconic acid (IA) to DES using the frontal polymerization (FP) method. The hydrogels were characterized by Fourier infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), and the influence patterns of IA content on the mechanical properties, swelling properties, and pH responsiveness of the composite hydrogels were investigated. The results showed that the composite hydrogel exhibited a homogeneous porous structure. The elongation at the break of the composite hydrogel gradually increased with the increase of IA content, and the elongation of the FP4 sample reached 167%. The addition of IA increased the number of hydrophilic groups, resulting in a 2.14-fold increase in the equilibrium swelling of the composite hydrogel in distilled water. P(IA-co-AA-co-AM) composite hydrogels exhibit different swelling patterns in acidic and alkaline environments, making them promising for acid–base indicators, biosensors, and other applications. In this study, a simpler and greener method was proposed to prepare P(IA-co-AA-co-AM) composite hydrogels with pH responsiveness.
研究领域:
材料科学
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高分子化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Shiyu Wei,Yafei Liu,Jieyu Zhou,Guochao Xu,Ye Ni
Two enantiocomplementary Baeyer-Villiger monooxygenases Ra BVMO and Am BVMO were identified by genome mining for the asymmetric sulfoxidation. Both recombinant BVMOs have optimal pH of 9.0 and temperature of 35 °C. The half-lives of Ra BVMO and Am BVMO at 30 °C were 24.4 and 24.6 h. Ra BVMO and Am BVMO exhibited broad substrate spectrum and could catalyze the oxidization of various compounds including fatty ketones, cyclic ketones, and thioethers. Kinetic parameters analysis revealed that both Ra BVMO and Am BVMO displayed higher catalytic efficiency toward thioanisole than cyclohexanone. As much as 50 mM thioanisole could be completely oxidized by Am BVMO and Ra BVMO with 99% ( R ) and 95% ( S ), respectively. Molecular docking analysis further provides evidence for the complementary enantioselectivity of Ra BVMO and Am BVMO. Our results demonstrate the potential application of the two novel BVMOs in asymmetric synthesis of sulfoxides.
研究领域:
生物化学
·
酶学
·
有机化学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Xikun Zhang,Xue Lv,Ting Xie,Yanwen Cheng,Jiajia Zhang,Xiaoyan Xu
In catalytic reactions, achieving large specific surface area immobilisation of the catalyst is an important factor affecting the catalytic effect, however, the primary challenges in utilizing hydrogels as catalyst carriers are to enhance the mechanical properties of the hydrogel to improve the activity and controllability of the catalyst. In this study, a new structure of P(AM-co-AA)/SMA/NH 2 -SiO 2 hydrogels was synthesized via free radical polymerization, and the effects of the content of AA and NH 2 -SiO 2 on the mechanical properties of the hydrogels were investigated. Without the use of additional cross-linking agents, both a chemical cross-linking network and a hydrophobic linkage network were established, which effectively reconstructed the structure of the hydrogels and dissipated energy. As a result, P(AM-co-AA-1.5 %)/SMA/NH 2 -SiO 2 -0.5 % hydrogel exhibited high mechanical properties, with tensile strength, elongation, and toughness reaching 1456 KPa, 4605 %, and 23.59 MJ/m 3 , respectively. This hydrogel can be utilized as a template for in situ and stable Ag NPs. Additionally, P(AM-co-AA)/SMA/NH 2 -SiO 2 @Ag composite hydrogels were prepared using cation exchange and in situ reduction methods for the catalytic reduction of 4-nitrophenol (4-NP). The composite hydrogel exhibited fast catalysis, high efficiency, stable cycling, recyclability and adjustable catalytic activity at 35 °C with K app = 0.811 min −1 . Furthermore, using this composite hydrogel alleviated the need for separating metal nanoparticle catalysts from the reaction system, thereby enabling the development of robust hydrogel materials with controlled catalytic activity for the wastewater treatment industry.
研究领域:
材料科学
·
环境科学
·
催化化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）