INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Chen Chen,Enhui He,Xiaohui Jiang,Shuwei Xia,Liangmin Yu
Improving the adsorption capacity of materials for pollutants by means of modification is an important direction in the research of water treatment technology. To improve the applicability of sodium alginate composites in the field of adsorption, magnetic sodium alginate-based hydrogel microsphere adsorbent material Fe 3 O 4 @SA/PEI-Fe (FSPF) was synthesized in a single step by using polyethyleneimine grafting modification of sodium alginate by sol-gel method. The material was used for the removal of direct blue GL (DB 200) and direct date red B (DR 13) from simulated wastewater, as well as Cu(II) and Pb(II) from simulated wastewater with heavy metal ions. Under the optimum preparation conditions, 0.025 g of FPSF could adsorb 2400 mg/L and 1700 mg/L of DB 200 and DR 13 dyes in 60 min, with removal rates of 92.9 % and 90.8 %, and adsorption quantities of 2229 mg/g and 1539 mg/g, respectively. For 300 mg/L and 400 mg/L pH 5.5 of the For 300 mg/L and 400 mg/L of Cu(II) and Pb(II) ions at pH 5.5, the FPSF reached adsorption equilibrium within 30 min, with removal rates of 95.8 % and 92.3 %, and adsorption quantities of 239 mg/g and 307 mg/g, respectively, which demonstrated highly efficient adsorption performance. In addition, the material has good magnetic responsiveness and can be quickly separated from the water column under an applied magnetic field. The adsorption mechanism follows the Pseudo-second-order kinetic model equation and Langmuir model, which is mainly monolayer adsorption. Thermodynamic analysis showed that the adsorption process for dye molecules was a spontaneous exothermic reaction, while the adsorption process for heavy metal ions was a spontaneous adsorption reaction. Cyclic regeneration experiments showed that after five rounds of adsorption-desorption cycles, the removal efficiencies of the material for the four pollutants in water were still maintained at about 80 % of the initial level.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Maria Wasim,Aneela Sabir,Muhammad Shafiq,Rafi Ullah Khan
In the textile industry , membrane technology has been widely employed for the exclusion of direct dyes. In this research paper, firstly vapor grown carbon nanofibers (VGCNFs) were functionalized with carboxylates group via piranha oxidation, and then series of CA/PEO-PPO-PEO triblock copolymers were prepared by blending with varying weight percentages of modified VGCNFs and Zirconia (ZrO 2 ). The structural morphologies of membranes were visualized by scanning electron microscope (SEM), atomic force microscopy (AFM) and transmission electron microscopy (TEM), which exhibits the dispersity of dual fillers in polymer matrix thus improving the microstructure of resultant membranes. The experimental data indicates that the modified VGCNF and ZrO 2 nanoparticles were shown increase hydrophilic character. The direct dyes rejection were successfully after filler addition, which were 96% (for Direct Red), 99% (for Direct Blue) and 93% (for Direct Orange). The membranes showed a better antifouling property even after several washing cycles along with improved biofouling property, both of these properties showed a better membrane life. As an outcome, this research could have been a great potential to be used to treat dyes in textile industry.
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Chen Chen,Enhui He,Weina Jia,Shuwei Xia,Liangmin Yu
The rapid development of the printing and dyeing industry has led to the production of a large amount of high-density printing and dyeing wastewater, and technology for its effective treatment has become a focus of research. To construct a polymeric adsorbent material with abundant functional groups for the efficient adsorption of dye wastewater, a novel magnetic sodium alginate/carboxymethylcellulose interpenetrating network gel sphere (Fe 3 O 4 @SA/CMC-Fe) was prepared by co-blending sodium alginate (SA) and sodium carboxymethylcellulose (CMC) with Fe 3 O 4 ; Fe 3 O 4 @SA/CMC-Fe was characterized by SEM–EDS, XRD, TGA , FT-IR, UV–Vis, VSM, BET-BJH and XPS . Static adsorption experiments showed that the optimal rates for adsorption of DV 51 and DR 23 from solutions with neutral pH values by Fe 3 O 4 @SA/CMC-Fe were up to 96 %, the adsorption process exhibited a Langmuir adsorption isotherm, and the dynamic adsorption process was accurately described by the pseudo-second-order kinetic model. A thermodynamic study showed that the adsorption reactions were all spontaneous exothermic reactions with increasing entropy. The mechanism for adsorption of the dyes by Fe 3 O 4 @SA/CMC-Fe involved hydrogen bonding, complexation and electrostatic adsorption. In summary, Fe 3 O 4 @SA/CMC-Fe is a green, simple, recyclable and highly efficient magnetic adsorbent that is expected to be widely used in treating dye wastewaters over a wide pH range.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2020
·Vol. 101
·期 3
·562-570
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IF 2.008
Su Zixian,Zhao Guangying,Dou Wenchao
Abstract In this paper, monodisperse high chroma colored silica nanoparticles (SiNPs) were efficiently prepared by layer-by-layer (LbL) self-assembled technique. Poly(sodium-p-styrenesulfonate) (PSS) and Poly(ethyleneterephthalate) (PEI) were respectively used as polyanion and polycationic electrolytes. The monodisperse SiNPs with negative charge on the surface were used as the matrix. Direct dye (C.I Direct Red 224) was deposited on the SiNPs surface by means of LbL electrostatic adsorption. PEI and C.I. Direct Red 224 were electrostatically adsorbed on the surface of SiNPs. Then PSS and PEI were adsorbed on SiNPs surface to make the red SiNPs positive negative, respectively. And multilayer film-coated high chroma red SiNPs were prepared by repeating the above steps 4 times. The effects of concentration of polyelectrolyte, supporting salt (NaCl), amount of C.I Direct Red 224 and deposition time on dye coupling rate were studied. The multilayer film-coated high chroma red SiNPs were characterized using Scanning Electron Microscopy (SEM), Nano ZS potential laser particle analyzer and UV–vis spectrophotometer. The nanoparticles show good dispersibility due to the mutual repulsion of the same charge, and deep color. In addition, dense nano-film formed prevents the detachment of the dye and prevent the dye from falling off. This high chroma red SiNPs is expected to become a probe of visual marker and amplify the signal in immunoassay.
Schematic representation of the preparation of high chroma colored silica nanoparticles Poly(sodium-p-styrenesulfonate) (PSS)/Poly(ethyleneterephthalate) (PEI) multilayer membrane by layer-by-layer self-assembly. The high chroma red nanoparticles were prepared for the first time using layer-by-layer self-assembly.
研究领域:
材料科学
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化学
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生物医学工程
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DOI
高影响因子
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