APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Linfeng Bai,Kezhu Xu,Wanquan Jiang,Min Sang,Qunling Fang,Shouhu Xuan,Xinglong Gong
Advanced nanocatalysts integrating with high activity and recyclability is one of the most important issues in heterogeneous catalysis. Magnetic hierarchical nanostructures comprising noble metal nanocrystals confined within a protecting penetrable shell will be favored as an efficient candidate toward robust catalytic reactions. This work reports a proof-of-concept magnetic separable nanocatalyst with the polydopamine (PDA)-confined-Au-nanocrystals assembled on the hierarchical surface of Fe 3 O 4 @SiO 2 @γ-AlOOH microflower (Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA). Because of the high surface area of γ-AlOOH hierarchical nanoarchitectures, the loading capacity and dispersity of Au nanocrystals are both improved. These magnetic microflowers present excellent catalytic efficiency and cycling performance in reduction of 4-nitrophenol to 4-aminophenol, which can be ascribed to the superior structure of catalyst. After 9 cycles, the activity of Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA maintains as high as 97.3% due to the protection of PDA shell. In comparison to the spherical Fe 3 O 4 @SiO 2 @Au/PDA, the as-prepared Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA microflowers exhibit quicker catalytic dynamic. The concept of hierarchical nanostructure and penetrable PDA protective layer will be instructive for fabricating high-performance nanocatalysts.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2018
·
IF 2.196
Yihong Jiang,Weiquan Cai,Wenjun Tu,Mengyuan Zhu
The magnetic Fe3O4@SiO2–chitosan (MFSC) with an extremely high adsorption capacity of 336.7 mg g–1 toward toxic Cr(VI) was synthesized successfully by a simple cross-link method. The physicochemical properties of the Fe3O4, Fe3O4@SiO2, and MFSC were characterized comparatively via X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, N2 adsorption–desorption, X-ray photoelectron spectroscopy analysis, and vibrating sample magnetometer. Their adsorption processes are well-fitted by the pseudo-second-order kinetic model; their equilibrium isotherms are better matched with the Langmuir isotherm. Further recycling experiments of MFSC show that its adsorption capacity of 78.6 mg g–1 still remains 81.7% of the original value (96.2 mg g–1), even after five times reuse. The interference adsorption experiments show that MFSC has stronger affinity for Cr(VI) in the solution containing Cr(VI), Cd(II), Cu(II), Zn(II), and Ni(II). The high adsorption capacity, good selectivity, and easy separation of MFSC clearly indicate that it is a potential recyclable adsorbent for Cr(VI) removal from wastewater.
研究领域:
环境科学
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材料科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Zhihui Chen,Jun Yao,Tatjana Šolević Knudsen,Bo Ma,Bang Liu,Hao Li,Xiaozhe Zhu,Chenchen Zhao,Wancheng Pang,Ying Cao
The environmental impact of the mining industry requires efficient and eco-friendly technologies to mitigate the presence of mineral flotation reagents (MFRs) in mineral processing wastewater (MPW) prior to their discharge into the environment. In this work, for the first time, a robust, easily separable and reusable biocatalyst, Fe 3 O 4 @SiO 2 -NH 2 -Lac, was used for the degradation of a novel mineral flotation reagent 8-hydroxyquinoline (8-HQ). Under optimized conditions, Fe 3 O 4 @SiO 2 -NH 2 -Lac achieved 89.2% 8-HQ degradation efficiency within 6 h. The effect of the main constituents of MPW on 8-HQ degradation, including metal ions, organic solvents, surfactant, metal chelator and flotation frother was evaluated. The Fe 3 O 4 @SiO 2 -NH 2 -Lac also displayed favorable degradation efficiency of 8-HQ in real lead–zinc mine water. The biocatalyst could be easily recovered and had a satisfactory reusability, retaining 64.5% of 8-HQ degradation efficiency in the sixth reaction cycle. Identification of intermediate products revealed that Fe 3 O 4 @SiO 2 -NH 2 -Lac mediated reaction predominantly generated various structural 8-HQ oligomers/polymers. A potential degradation pathway for 8-HQ was speculated as follows: Fe 3 O 4 @SiO 2 -NH 2 -Lac initially catalyzed the oxidation of 8-HQ to yield the corresponding reactive radical intermediates, which subsequently undergone self-coupling reaction via C − C and C − O − C covalent coupling at their ortho and/or para positions, finally forming oligomers and polymers. The inhibition assays of marine bacterium ( Vibrio fischeri ) demonstrated that the toxicity of 8-HQ and its intermediate products was effectively reduced after Fe 3 O 4 @SiO 2 -NH 2 -Lac treatment. The results of this study might present an alternative immobilized laccase-based clean biotechnology for the clean-up and detoxification of 8-HQ contaminated MPW.
研究领域:
环境科学
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生物技术
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化学工程
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材料科学
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2026
·Vol. 33
·期 8
·337
·
IF 3.5
Wang Kai,Li Aiyuan,Zhou Xiaoyan,Yu Shibeike,Chen Bifen,Sun Xiangdong,Zhang Chenyang
Congo red (CR) is a representative benzidine-based anionic azo dye with high toxicity, carcinogenicity, and poor biodegradability, posing substantial threats to human health and aquatic ecosystems. Therefore, its effective removal from wastewater remains a major environmental challenge. To address this, magnetic Fe 3 O 4 @SiO 2 @PPy-CTAB composite microspheres (PPy: polypyrrole; CTAB: cetyltrimethylammonium bromide) were fabricated using a hydrothermal technique in combination with surface modification and in-situ polymerization. The composite was systematically examined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), vibrating sample magnetometry (VSM), and X-ray photoelectron spectroscopy (XPS), showing a well-defined core-shell framework, with a specific surface area (SSA) of 52.96 m 2 /g, a saturation magnetization of 42.8 emu·g − 1 , and a positively charged surface as a result of CTAB modification. Under optimal conditions (pH = 5, Fe 3 O 4 :CTAB mass ratio = 1:1.5), the CR adsorption capacity reached a maximum of 612.68 mg/g. Kinetic, isothermal, and thermodynamic analyses indicated that the adsorption process was best described by the pseudo-second-order kinetic model and the Langmuir isotherm model, suggesting a spontaneous, endothermic, and entropy-driven chemisorption process. The adsorption mechanism was primarily governed by electrostatic interactions, synergistic π-π stacking, and hydrogen bonding. After ten desorption-adsorption cycles, the adsorption capacity retained 87.1% of its initial adsorption capacity, demonstrating good reusability. The Fe 3 O 4 @SiO 2 @PPy-CTAB composite demonstrates high CR adsorption capacity (612.68 mg/g) and good reusability (87.1% retention after 10 cycles), making it a promising candidate for magnetic separation-based dye wastewater treatment. However, the use of CTAB and organic solvents limits the designation as “green”, and real-world validation is needed before practical application.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Mingliang Ma,Yuying Yang,Yan Chen,Yong Ma,Ping Lyu,Aiqi Cui,Weibo Huang,Zhe Zhang,Yanzheng Li,Feiyan Si
The flower-like Fe 3 O 4 /SiO 2 /MnO 2 /BiOBr-Bi magnetic composite photocatalyst was prepared in this work. The combination of BiOBr and Bi metal with flower-like MnO 2 constituted a heterojunction structure, which increased the specific surface area of the photocatalyst and promoted the separation of photo-generated carriers, resulting in the enhanced catalytic performance. The morphologies and the compositions of the photocatalyst were characterized in detail. Under simulated light, the degradation of organic dye methylene blue (MB) was used to research the photocatalytic activity. In the case of 15 mg photocatalyst, it was found that the photocatalytic degradation efficiency to the MB solution was 95.23% within 150 min. Moreover, the degradation rate of MB could still reach 81.11% after four cycles. The design of flower-like composites with magnetic core-shell structure provided a new method for fabricating photocatalysts having excellent catalytic performance and cyclic stability.
研究领域:
材料科学
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环境科学
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2018
·Vol. 44
·期 10
·6369-6385
·
IF 1.674
Chen Zhangxu,Fu Ming-Lai,Huang Xiao-Dan,Yuan Baoling,Yang Jia-Cheng E.
To enhance photocatalytic activity spectra area of the TiO 2 based photocatalyst, and to separate and recycle photocatalyst easily, magnetic photocatalyst was prepared with β-NaYF 4 :Yb 3+ ,Tm 3+ , TiO 2 , Fe 3 O 4 as carriers, and tetraethyl orthosilicate as precursor. The magnetic infrared responsive photocatalysts were thoroughly characterized by field emission scanning electron microscopy, X-ray diffraction, a fluorescence spectrometer and UV–Vis–NIR diffuse reflectance spectroscopy. They showed that the composite of β-NaYF 4 :Yb 3+ ,Tm 3+ /TiO 2 /Fe 3 O 4 @SiO 2 (UCTFS) emits visible luminescence upon 980 nm excitation, and energy transfer from β-NaYF 4 :Yb 3+ ,Tm 3+ to TiO 2 was verified. The photocatalytic activities of the UCTFS were studied by orthogonal experiments for photodegradating methylene blue (MB). The degradation rate of MB can reach 86.69% under the optimal conditions. After the four recycles, the degradation rate remained 52.72%. It also showed that 50.27% of the degradation efficiency of phenol can be obtained under the same experimental parameters. These results suggest that magnetic UCTFS composite is stable and a magnetic NIR-driven photocatalyst for degradation of organic pollutants. Moreover, the NIR driven photocatalytic mechanism of this reported composite was proposed. The strategy suggested here may be indicated for the effective fabrication of magnetic NIR-driven photocatalyst for application in the water purification by full spectra of solar energy.
研究领域:
材料科学
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环境科学
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纳米技术
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高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
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2019
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IF 3.714
Jiadi Sun,Wei Guo,Jian Ji,Zaijun Li,Xiao Yuan,Fuwei Pi,Yinzhi Zhang,Xiulan Sun
As a kind of mycotoxins , patulin has been a usual contamination in apple juice and causes a serious public health concern nowadays. Regarding this issue, a novel and effective adsorbent, Fe 3 O 4 @SiO 2 @CS-GO@MIP, is designed to remove the patulin from apple juice. Firstly, the molecularly imprinted polymer (MIP) was prepared by surface imprinting technique. Meanwhile, addition of Fe 3 O 4 makes the final prepared MIP adsorbent magnetic, which is beneficial for separating the adsorbent from the food matrix. Moreover, chitosan (CS) and SiO 2 improve the biocompatibility, stability and dispersibility of the MIP adsorbent effectively. As for the adsorption performance, batches of experiments were conducted on the proposed adsorbent. Experimental results showed that the adsorption process followed pseudo-second-order kinetic and Freundlich isotherm model, and the physical multi-molecular layer endothermic adsorption happened during the whole adsorption process. Adsorption capacity of the proposed adsorbent is 7.11 mg/g maximumly, and over 90% of the total patulin in apple juice being removed after 24 h. Besides, the proposed adsorbent has distinguishing characteristics, including large specific surface area with BET reaching 279.6 m 2 /g, high cell viability of 79.77% and no negative effects on final quality parameters. The desirable adsorption performance and characteristics make Fe 3 O 4 @SiO 2 @CS-GO@MIP a promising adsorbent for removing the patulin from apple juice in the future.
研究领域:
食品安全
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环境科学
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材料科学
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高影响因子
Alexandria Engineering Journal
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2020
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IF 2.46
Saifeldin M. Siddeeg,Abdelfattah Amari,Mohamed A. Tahoon,Norah Salem Alsaiari,Faouzi Ben Rebah
For the simultaneous removal of water contaminants, a novel nanocomposite has been produced. The iron oxide core with silica shell was used to prepare functional magnetic polymer Fe 3 O 4 /SiO 2 /glycidyl methacrylate (GMA)-S-SH nanocomposite. The sulfur functional nanocomposite is suitable for the immobilization of laccase enzyme. The synthesized nanocomposite was characterized using FT-IR spectroscopy, SEM, TEM, XRD, and magnetometer. The effect of pH, temperature, and storage time over free and immobilized enzyme was studied that indicating the higher stability of immobilized enzyme than that free one. The prepared novel nanocomposite showed high adsorption capacity toward Cd +2 ions in addition to the degradation of meloxicam and piroxicam anti-inflammatory drugs. The removal efficiency reached up to 94% ± 2%, 92% ± 2%, and 95% ± 2% for Cd +2 ions, meloxicam, and piroxicam, respectively at optimum pH and temperature. Also, the results show that this nanocomposite is recyclable. The efficient removal of Cd +2 ions and pharmaceuticals can be reached up to four cycles. We conclude that the prepared nanocomposite is promising for water treatment.
研究领域:
环境科学
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生物技术
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材料科学
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Taiguang Li,Mingyong Wang,Yongmei Hao
A novel magnetic core-shell Fe 3 O 4 @SiO 2 @CdS embedded graphene oxide (GO) composite was prepared for the visible-light-driven photodegradation of high ring number polycyclic aromatic hydrocarbons (PAHs). The potential application of GO-Fe 3 O 4 @SiO 2 @CdS was evaluated through the photodegradation of phenanthrene and pyrene in deionized water, tap water , and lake water, respectively. It was found that GO-Fe 3 O 4 @SiO 2 @CdS could remove 86.4 % of phenanthrene and 93.4 % of pyrene, suggesting its potential for the degradation of high-ring number PAHs. The density functional theory (DFT) calculations demonstrate that pyrene has more active sites attacked by free radicals. The photoelectrochemical measurement and quenching experiments indicate that GO can transfer photoelectrons efficiently, resulting in the crucial radicals ( O 2 − , OH and 1 O 2 ). More importantly, the photocatalytic activity kept almost constant during five cycles, confirming the significant anti-photocorrosion of GO-Fe 3 O 4 @SiO 2 @CdS. This work provides some new insights into the removal of PAHs with high-ring numbers in the natural water environment.
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 ORGANOMETALLIC CHEMISTRY
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2021
·
IF 2.369
Yingpeng Huo,Jiwen Hu,Yuanyuan Tu,Zhenzhu Huang,Shudong Lin,Xiaojiong Luo,Chao Feng
Reported herein is a magnetically separable heterogeneous nano catalyst Fe 3 O 4 @SiO 2 -biIMI- PtCl 2 , which is prepared by firstly applying a SiO 2 coating onto readily synthesized magnetite nanoparticles via the hydrolysis condensation of tetraethyl orthosilicate (TEOS) under basic conditions, then modifying it using aminopropyl triethoxysilane and bis(imidazole) aldehyde, and finally incorporating a PtCl 2 complex via coordination chemistry. The chemical structure and morphology of the nanocatalyst as well as the valence state and content of platinum within this catalyst were carefully characterized. This catalyst can mediate the hydrosilylation between 1-octene and hydrosilane, with the conversion of 1-octene reaching up to 99%, and it shows good regioselectivity as only β-adducts are identified. In addition, this catalyst can be reused for at least 5 cycles. The hydrosilylation reaction between different olefins and hydrosilanes can also be efficiently mediated by Fe 3 O 4 @SiO 2 -biIMI-PtCl 2 .
研究领域:
催化
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材料科学
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有机化学
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 16
·7503-7511
·
IF 3.925
Ying Peng,Xiaowen Zhang,Xiaoyan Wu,Mi Li,Yu Zhang,Chaochao Zhou,Yilong Hua
The combination of magnetic nanoparticles and metal–organic frameworks (MOFs) has demonstrated their potential for pollutant sequestration. In this work, Fe3O4@SiO2@UiO-66 core–shell magnetic microspheres were synthesized and used for the removal of U(VI) from an aqueous environment. The characterization via transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectrometry (FT-IR), vibrating sample magnetometry (VSM), thermogravimetric analysis (TGA) and nitrogen adsorption porosimetry proved that the Fe3O4@SiO2@UiO-66 core–shell nanocomposite was successfully prepared. Batch experiments were conducted to study the effects of initial pH, shaking time and temperature on the uranium sorption efficiency. The isotherm and kinetic data were accurately described by the Langmuir and pseudo-second-order models. The maximum adsorption capacity was calculated to be 616.5 mg g−1 for U(VI) by fitting the equilibrium data to the Langmuir model. Various thermodynamic parameters were evaluated, which indicated the endothermic and spontaneous nature of adsorption. Thus, the excellent adsorption capacity and sensitive response of the Fe3O4@SiO2@UiO-66 core–shell magnetic microspheres to a magnetic field make them a promising candidate for the removal of uranium(VI) from aqueous solutions.
研究领域:
环境科学
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材料科学
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纳米技术
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化学工程
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 7
·1885-1891
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IF 3.307
Su Yu,Shao Chenggang,Huang Xielin,Qi Jinxia,Ge Renshan,Guan Huaqin,Lin Zhenkun
A new type of magnetic nanoparticles (MNPs), as the absorbents of bisphenol A (BPA), was prepared by functionalization of Fe 3 O 4 @SiO 2 with BPA-specific aptamer in this work. ssDNA aptamer was immobilized on the Fe 3 O 4 @SiO 2 surface through biotin-avidin interactions, playing a role of the specific probe for BPA. The resultant materials (Apt-MNPs) exhibited outstanding magnetic responsibility and can be separated efficiently by the magnetic field. Experimental results also showed that Apt-MNPs had large adsorption capacity and high competitive selectivity for the targeted compound BPA. Furthermore, Apt-MNPs were adopted as the specific absorbents to extract and enrich BPA from human serum and urine samples. Therefore, an efficient detection method of BPA was developed in combination with high-performance liquid chromatography (HPLC). The linearity of the method was over a range of 5–10,000 ng mL −1 with a correlation coefficient of 0.99997, and the limit of detections (LODs) for serum and urine were 2.0 and 1.0 ng mL −1 , respectively. The recoveries of BPA in the spiked human serum and urine samples were 90.8 ± 7.3% (RSD) and 92.3 ± 1.5%, respectively. Our results demonstrated that Apt-MNPs were high-performance adsorbents for extracting and enriching BPA, resulting in fast and efficient detection of BPA in serum and urine samples.
Aptamer-MNPs were effective for BPA separation from serum and urine
研究领域:
分析化学
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环境科学
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材料科学
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生物技术
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DOI
PubMed
高影响因子
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