Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 31
·12304-12310
·
IF 0
Dahu baiyila,Xiaohui Wang,Xin Li,Bao sharileaodu,Xiaotian Li,Liang Xu,Zongrui Liu,Limei Duan,Jinghai Liu
TiO2 nanofibers integrating space-separated magnetic nanoparticles and heterostructures have been fabricated to construct multifunctional photocatalysts with excellent photocatalytic activity and magnetic recoverability. The electrospinning technique has been employed to prepare the Fe3O4-embedded TiO2 (Fe3O4@TiO2) magnetic nanofibers. TiO2/CdS heterostructures (Fe3O4@TiO2/CdS) formed by depositing CdS nanoparticles onto the Fe3O4@TiO2 nanofibers have been obtained by a hydrothermal process. The heterostructures improve the photocatalytic activity and widen the range of solar light response. Under visible light irradiation, the photocatalytic activity of the Fe3O4@TiO2/CdS nanofibers is 5.11 times higher than that of the Fe3O4@TiO2 nanofibers and is 1.22 times than that of CdS nanoparticles. In addition, it exhibits a slight increase under simulated solar light with the photocatalytic degradation ratio 1.1 times higher than that under visible light. The loading amounts of CdS only have effects on the photocatalytic activity under visible light and simulated solar light. The Fe3O4@TiO2/CdS nanofiber exhibits a saturation magnetization strength of 1.572 emu g−1 and can be effortlessly separated and recovered by applying a contactless magnetic field. The cycling stability is durable after magnetic separation and recycling.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
Journal of Water Process Engineering
·
2025
·
IF 6.7
Ying Xu,Shuili Yu,Zhiqiang Fan,Xingli Ji,Cong Huang,Zheng Xu,Rui Liu,Chao Jiang
Bromate (BrO 3 − ), a carcinogenic and regulated disinfection by-product, poses a persistent challenge to drinking water safety due to its high solubility and chemical stability. In this work, a noble-metal-free Fe 3 O 4 /TiO 2 /Bi photocatalyst was successfully prepared and subsequently applied for BrO 3 − reduction under ultraviolet light. The ternary composite design enables cooperative functionality among the components, where Fe 3 O 4 facilitates charge transfer and magnetic separability, Bi 0 acts as a hole scavenger, and TiO 2 serves as the primary photoactive material. Characterization results confirmed the successful formation of the heterostructure with enhanced charge separation properties. The composite containing 5 wt% Bi exhibited the highest activity, achieving 99 % BrO 3 − removal within 25 min at pH 7.0, with a pseudo-first-order rate constant of 0.185 min −1 , which is 11.8 times that of pure TiO 2 . The enhanced photocatalytic performance is ascribed to the synergistic effect between Bi, Fe 3 O 4 and TiO 2 . Bi 0 nanoparticles functioned as hole acceptors to suppress recombination, while Fe 3 O 4 facilitated electron transport and provided magnetic separability. The photocatalyst retained high activity over five consecutive cycles with negligible metal leaching and performance loss. In addition, its effectiveness was verified in tap water containing typical inorganic ions and dissolved organic matter, demonstrating moderate inhibition but maintaining BrO 3 − reduction capability. This study provides a cost-effective, magnetically recoverable, and noble-metal-free photocatalyst with improved charge separation efficiency and recovery feasibility, offering practical potential for BrO 3 − mitigation in drinking water treatment.
研究领域:
环境科学
·
材料科学
·
水处理技术
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xuan Liu,Jie Chao,Feifei Guo,Liangliang Chang,Zengzhe Xi
To address rapid carrier recombination and low magnetic separation efficiency in piezocatalysis, Gd/Ni co-doped BiFeO3 nanoparticles were synthesized via a sol–gel method. Rietveld refinement confirmed lattice distortion and secondary phase formation at high doping levels. Gd/Ni doping induces a phase transition in BFO from rhombohedral to orthorhombic, with the Pnma proportion reaching 84.15% at x = 0.09. Gd/Ni co-doping induced 12.7% oxygen vacancy concentration, suppressing electron–hole recombination, while enhanced Dzyaloshinskii–Moriya interaction increased saturation magnetization by 17.85-fold (magnetic recovery > 95%). The optimized sample (x = 0.09) achieved 80.94% ofloxacin degradation in 120 min (twice that of pristine BiFeO3), retaining 71.53% efficiency after 4 cycles. Radical trapping and EPR identified ˙OH and ˙O2− as dominant species, revealing a ferroelectric–piezoelectric synergistic mechanism. This work provides a strategy for designing magnetically recoverable piezocatalysts for complex wastewater treatment.
研究领域:
环境催化
·
功能材料学
·
纳米材料
·
环境化学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2022
·Vol. 10
·期 2
·476-488
·
IF 9.473
Xiaolei Zhang,Bin Liu,Tao Wei,Zongming Liu,Jinkai Li
Micromotors, which combine nanotechnology with autonomous movement, have attracted extensive interest in the field of environmental monitoring and remediation. However, it is still a challenge to develop a facile method to prepare a multifunctional micromotor for simultaneously detecting and removing organic pollutants from water. Herein, we report a novel magnetically controllable Janus micromotor with peroxidase-like activity for simultaneous colorimetric detection and degradation of hydroquinone (HQ). Such polyethylene glycol (PEG) modified Janus micromotor was composed of calcined manganese(II) acetate modified Fe3O4@polyacrylic acid (PAA) and ferric oxide (Fe3O4) nanoparticles. The obtained Janus micromotors (P-FM JMMs) have a unique asymmetric structure and exhibit autonomous motion with a maximum speed of 95.2 ± 3.02 μm s−1 in the presence of 100 mM H2O2. Combining the advantages of autonomous motion and superior peroxidase-like activity, P-FM JMMs as effective micromotors were established for dynamic sensitive colorimetric detection of HQ with a detection limit of 0.0923 μM and rapid degradation of HQ via excellent Fenton-like activity in water. In addition, such Janus micromotors also could achieve effective magnetic recovery to reduce water pollution. The strategy provides a new insight for the future multifunctional task allocation of micromotors on demand.
研究领域:
环境科学
·
纳米技术
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 26
·1-16
·
IF 2.8
Wei Qian,Zheng Meng
Microplastics (MPs) pose significant environmental and health risks, and conventional disposal methods often suffer from inefficiency and potential ecological harm. Photocatalytic degradation has emerged as a promising solution. However, traditional TiO 2 -based photocatalysts are limited by high electron–hole recombination rates, narrow visible light absorption, and poor reusability. In this study, we develop and optimize a Fe 3 O 4 @TiO 2 /Ag nanocomposite for the efficient degradation of polyethylene (PE) MPs with facile recovery. The synergistic integration of Fe 3 O 4 and Ag with TiO 2 enhances visible light absorption and mitigates charge carrier recombination. Notably, the Fe 3 O 4 @TiO 2 /Ag nanocomposite exhibits a degradation efficiency of 15.54%, outperforming Fe 3 O 4 @TiO 2 (12.63%) and pristine TiO 2 (1.15%). Moreover, the composite maintains its performance over five consecutive cycles, underscoring its durability. The degradation efficiency of Fe 3 O 4 @TiO 2 /Ag was further optimized using response surface methodology. Overall, the developed Fe 3 O 4 @TiO 2 /Ag nanocomposite exhibits excellent photocatalytic efficiency, magnetic recoverability, and long-term stability, highlighting its potential for practical applications in mitigating microplastic pollution.
研究领域:
环境科学
·
材料工程
·
纳米技术
·
化学工程
·
污染控制
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2021
·Vol. 24
·期 1
·271-284
·
IF 10.182
Xiuzheng Zhuang,Jianguo Liu,Shurong Zhong,Longlong Ma
Amines with functional groups are widely used in the manufacture of pharmaceuticals, agricultural chemicals, and polymers but most of them are still prepared through petrochemical routes. The sustainable production of amines from renewable resources, such as biomass, is thus necessary. For this reason, we developed an eco-friendly, simplified, and highly effective procedure for the preparation of a non-toxic heterogeneous catalyst based on earth-abundant metals, whose catalytic activity on the reductive amination of furfural or other derivatives (more than 24 examples) proved to be broadly available. More surprisingly, the cobalt-supported catalyst was found to be magnetically recoverable and reusable up to eight times with an excellent catalytic activity; on the other hand, the gram-scale tests catalyzed by the same catalyst exhibited the similar yield of the target products in comparison to its smaller scale, which was comparable to the commercial noble-based catalysts. Further results from a series of analytical technologies involving XRD, XPS, TEM/mapping, and in situ FTIR revealed that the structural features of the catalyst are closely in relation to its catalytic mechanisms. In simple terms, the outer graphitic shell is activated by the electronic interaction as well as the induced charge redistribution, enabling the easy substitution of the –NH2 moiety toward functionalized and structurally diverse molecules, even under very mild industrially viable and scalable conditions. Overall, this newly developed catalyst introduces the synthesis of amines from biomass-derived platforms with satisfactory selectivity and carbon balance, providing cost-effective and sustainable access to the wide applications of reductive amination.
研究领域:
催化
·
化学工程
·
材料科学
·
可持续化学
·
纳米技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Nana Xiong,Peng Wan,Guocheng Zhu,Fubing Xie,Shengnan Xu,Chuanqu Zhu,Andrew S. Hursthouse
A series of environmental and health problems caused by the release of large quantities of antimony into the water environment have received wide social concern in a number of regions worldwide. Finding a feasible treatment technology is the best choice for the sustainable remediation of antimony pollution. A novel nano-modified chitosan (NMCS) was prepared by grafting iron oxide nanoparticles (Nano-Fe 3 O 4 ) and carboxylate metal organic frameworks (MOFs) denoted as MIL-100(Fe) onto chitosan. The NMCS before and after adsorption was characterized by analytical tools including Fourier transform infrared and X-ray photoelectron spectroscopy. Batch experiments with variable NMCS dose, solution pH, and competing anions were used to evaluate the most efficient way to remove Sb (III) from aqueous solutions. The results showed that removal efficiency increased with the increase of the NMCS concentration and solution pH, respectively. The maximum removal efficiency of Sb(III) was 96.8%, at pH 11 with 1.5 g/L of NMCS when treating a Sb(III) model solution of 10 mg/L, which is much higher than that with Nano-Fe 3 O 4 or MOFs. Compared with the efficient removal of Sb(III) under acid conditions, NMCS has a higher removal efficiency under alkaline conditions. The effect of common anions such as sulfate, carbonate, nitrate and chloride ions, on the removal of Sb(III), was minor. The removal of Sb(III) could be clearly described by pseudo-second order sorption kinetics and Freundlich isotherm, which suggested inner-sphere surface binding mechanisms. The presence of Sb (III) on NMCS was confirmed by an X-ray photoelectron spectroscopic analysis, and those functional groups binding to Sb (III) were identified using Fourier transform infrared analysis. The ability of NMCS to be regenerated was good and further enhanced by the possibility of magnetic recovery. Overall, the findings tested in this study showed that the NMCS developed can effectively remove Sb(III) from aqueous solutions and can be effectively recovered and reused.
研究领域:
环境科学
·
水处理
·
材料科学
·
纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）