INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
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IF 3.909
Jianming Wu,Xi Cheng,Guisheng Yang
In this study, nanochitin-contained magnetic chitosan (FPCC) microfibers were prepared successfully via continuous injection gelation method and employed to remove Ni(II) ion from aqueous solution. Firstly, Fe 3 O 4 -nanoparticles were encapsulated into ε-caprolactam (CL) monomer solution in the presence of polystyrene (PSE), followed by CL anionic ring-opening polymerization and PSE removal, and obtained magnetic polyamide 6 (PA 6) microparticles (FP). After that, the economical FPCC microfibers can be prepared by adding FP microparticles and nanochitin (n-CT) into poly(vinyl alcohol)/chitosan hybrids (PVA/CTS). The obtained FPCC microfibers had shown significant advantages in production, separation, and adsorption when compared to the hydrogel beads prepared by the traditional method (instantaneous gelation method). Within 10 h, 99.7% Ni(II) could be adsorbed by FPCC magnetic microfibers (adsorbent dosage: 1 g, pH: 4.1, and temperature: 293 K). More attractively, the hybridized microfibers could be easily separated from the aqueous solution through a magnetic separation method after Ni(II) adsorption. Ni(II) adsorption behaviors of the hybrid microfibers conform to the Langmuir isotherm model and pseudo-second-order kinetic model. Besides, the possible adsorption mechanism was also discussed.
研究领域:
材料科学
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环境科学
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生物技术
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DOI
PubMed
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2024
·Vol. 650
·期 16
·e202400047
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IF 1.1
Zhong-Xuan Xu,Xiu-Ju Ying,Fei Fei
Under hydrothermal condition, lactate derivative ( R )-4-(1- carboxyethoxy)-2-methylbenzoic acid (( R )-H 2 cma) as chiral synthon assembled with 4,4′-di(1H-imidazol-1-yl)-1,1′-biphenyl (4,4’-dib) and Ni(II) ions to obtain complex {[Ni 2 (( R )-cma) 2 (4,4’-dib) 2 (H 2 O)] ⋅ 2H 2 O} n ( HU20- R ). In complex HU20- R , carboxyl group from lactate unit of ( R )-cma 2− anion and coordinating H 2 O molecule adopt a μ 2 -coordination mode to obtain dinuclear [Ni 2 (CO 2 ) 2 (H 2 O)] 2+ cluster. ( R )-cma 2− anions and Ni(II) ions build single left-handed ( R )-cma-Ni-chain, while 4,4’-dib ligands are bridged by different Ni(II) centers to form double left-handed 4,4’-dib-Ni-chain. These helical secondary structures are further connected together to result in an 8-connected 3D framework. PXRD tests indicated that complex HU20- R has well hydro-stability. UV-vis absorption experiment confirmed that HU20- R is a semi-conducting material with strong absorption capacity for ultraviolet-visible (UV-vis) light. Additionally, electrochemical experiment revealed that HU20- R has low impedance and high charge transport capacity. Further test results confirm that HU20- R has noticeable photo-catalytic effect in photodegradation of Rhodamine B (RhB) and antiferromagnetic property.
研究领域:
材料化学
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配位化学
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光电材料
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 4
·3821-3832
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IF 3.277
Yan Liu,Fangfang Liu,Minjia Meng,Zhanchao Liu,Liang Ni,Guoxing Zhong
In this study, a Ni(II) ion imprinted polymer (Ni(II)-IIP) based on macroporous–mesoporous silica (MMS) was optimally synthesized using a response surface methodology (RSM) approach for enhanced dynamic adsorption capacity. The MMS was prepared via dual-templating routes employing liquid crystalline surfactants and polystyrene beads to improve mass transfer and reduce transport limitations. With dynamic adsorption capacity for Ni(II) as the response, the effects of four variables, i.e. the amount of S,S′-bis(α,α′-dimethyl-α′′-acetic acid)trithiocarbonate (BDAAT), the consumption of acrylamide (AM), the reaction time and the dosage of 2,2′-azobisisobutyronitrile (AIBN), were investigated to solve the complex synthesis process. The predicted appropriate preparation conditions were as follows: BDAAT dose 0.07 g, AM dose 0.029 g, reaction time 6.3 h, and AIBN dose 4.54 mg, under which a Ni(II)-IIP was prepared and used as an adsorbent to remove Ni(II), obtaining the maximum dynamic adsorption capacity (12.96 mg g−1). The significance of independent variables and their interactions was studied to explain the specific adsorption question. In addition, the resulting Ni(II)-IIP was performed without any obvious deterioration after five repeated cycles.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
E-POLYMERS
·
2021
·Vol. 21
·期 1
·590-605
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IF 2.025
Li Zhao,Xianzhi Hu,Futing Zi,Yingmei Liu,Deqiong Hu,Peng Li,Huiling Cheng
In this study, a novel functional monomer N -(1-(2,4-difluorophenyl)-2-(1 H -1,2,4-triazol-1-yl)ethyl)acrylamide (NDTEA) was designed and synthesized, and was used to prepare Ni( ii ) ion-imprinted polymers (Ni( ii )-IIPs). Sixteen kinds of Ni( ii )-IIP (Ni( ii )-IIP 1–16 ) and corresponding non-imprinted polymers (NIP 1–16 ) were prepared by precipitation polymerization method. After optimized condition experiment, Ni( ii )-IIP 5 possessed maximum adsorption capacity and better imprinting factor under optimal experimental conditions which indicated by equilibrium adsorption experiments. The morphology and structural characteristics of Ni( ii )-IIP 5 were characterized by scanning electron microscopy (SEM) and Brunauer–Emmett–Teller (BET). The adsorption selectivity of Ni( ii )-IIP 5 was analyzed by ICP-OES, and the results showed that Ni( ii )-IIP 5 had favorable selectivity recognition ability for Ni( ii ) when Cu( ii ), Co( ii ), and Cd( ii ) are used as competitive ions. The kinetic experiment indicated that the performance of Ni( ii ) adsorption on the surface of Ni( ii )-IIP 5 obeyed the pseudo-first-order model, and adsorption equilibrium was attained after 15 min. Isothermal adsorption process fitted to Langmuir and Freundlich isothermal adsorption models, simultaneously. The results showed that Ni( ii )-IIP 5 prepared by using a new functional monomer had better permeation selectivity and higher affinity for Ni( ii ), which also verified the rationality of the functional monomer design. At the same time, it also provided a broad application prospect for removal of Ni( ii ) in complex samples.
研究领域:
高分子科学
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环境化学
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材料科学
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分析化学
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高影响因子
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