MOLECULES
·
2013
·Vol. 18
·期 11
·14258-14267
·
IF 2.428
Huan Liu,Chao Lin,Zhen Ma,Hongbo Yu,Shenghu Zhou
Fe3O4spheres with an average size of 273 nm were prepared in the presence of CTAB by a solvothermal method. The spheres were modified by a thin layer of SiO2, and then coated by mesoporous SiO2(m-SiO2) films, by using TEOS as a precursor and CTAB as a soft template. The resulting m-SiO2/Fe3O4spheres, with an average particle size of 320 nm, a high surface area (656 m2/g), and ordered nanopores (average pore size 2.5 nm), were loaded with gold nanoparticles (average size 3.3 nm). The presence of m-SiO2coating could stabilize gold nanoparticles against sintering at 500 °C. The material showed better performance than a conventional Au/SiO2catalyst in catalytic reduction ofp-nitrophenol with NaBH4. It can be separated from the reaction mixture by a magnet and be recycled without obvious loss of catalytic activity. Relevant characterization by XRD, TEM, N2adsorption-desorption, and magnetic measurements were conducted.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jingzhen Wang,Linlin Zang,Libin Wang,Yutong Tian,Zhiyu Yang,Yumei Yue,Liguo Sun
Photocatalytic degradation is an effective technique for removing antibiotics from contaminated water . The kernel of photocatalytic degradation lies in the design and preparation of high-performance and recyclable catalysts. Herein, magnetic porous cobalt ferrite/reduced graphene oxide (CF/rGO) balls were prepared by calcination of spherical composites obtained via modified microfluidic method for effective photocatalytic degradation of oxytetracycline (OTC). The strong interfacial interaction between rGO and cobalt ferrite nanoparticles in porous balls enhanced electron transfer , charge separation and light absorption . Porous spherical structure was favorable for light harvesting. The catalyst could rapidly and efficiently absorb OTC. These characteristics were beneficial to the enhancement of photocatalytic efficiency. The optimized sample (CF/rGO-0.2) exhibited an excellent apparent rate constant (0.0410 min −1 ) for OTC degradation under visible light irradiation, which was 3.73 times that of CF/rGO-0 (0.0110 min −1 ). CF/rGO-0.2 had excellent stability in cycle experiments and could be quickly recovered by magnets. The trapping experiments showed that hole (h + ) and superoxide radicals (·O 2 - ) acted an extremely important role in degradation of OTC, thus suggesting a possible photocatalytic reaction mechanism. This work provides a potential photocatalyst for antibiotic removal from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL SCIENCES
·
2023
·
IF 1.6
Xu Yang,Liu Yue,Luo Yu,Xu Xinlin,Li Yingying,Zhao Lin,Li Tiantian,Zhang Yan,He Peng,Mou Xiaoming
Lysozyme (LYS) is a widely used bacteriostatic enzyme. In this paper, we built a sensitive and accurate Raman biosensing platform to detect trace amounts of LYS. The method is based on magnetic spherical nucleic acid formed by a combination of LYS aptamer (Apt) and magnetic beads (MBs). Meanwhile, this method utilizes a dual enzyme-assisted nucleic acid amplification circuit and surface-enhanced Raman scattering (SERS). In this sensing strategy, which is based on the specific recognition of Apt, magnetic spherical nucleic acids were associated with SERS through a nucleic acid amplification circuit, and the low abundance of LYS was converted into a high-specificity Raman signal. Satellite-like MB@AuNPs were formed in the presence of the target, which separated specifically in a magnetic field, effectively avoided the interference of complex sample environment. Under the optimal sensing conditions, the concentration of LYS exhibited a good linear relationship between 1.0 × 10 –14 and 5.0 × 10 –12 M and the limit of detection was as low as 8.3 × 10 –15 M. In addition, the sensor strategy shows excellent accuracy and sensitivity in complex samples, providing a new strategy for the specific detection of LYS. Graphical abstract
研究领域:
生物化学
·
分析化学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 1
·015504
·
IF 1.62
Meng Li,Jianjun Li,Xujie Peng,Tianyu Hu,Liting Zhang,Xin Rong,Changguo Xue,Linfeng Xu
Owing to the synergetic characteristics of effective adsorption and magnetic separation, adsorption using magnetic adsorbents was regarded as one of the most promising methods for synthetic dye removal. Herein, a green, cheap, and efficient magnetic adsorbent was synthesized by a simple chemical oxidation in situ polymerization method. Processed coal-fly-ash magnetic spheres (CMS) were employed as the magnetic core material. A polyaniline (PANI) layer was covered on the CMS@SiO2 surface to form a core–shell structural magnetic adsorbent, CMS@SiO2@PANI. Careful investigations showed that the PANI layer was composed of nanorods of dozen nanometers in width and several microns in length, which forms an interconnected network and covers the overall surface of the core. The saturation magnetization of CMS@SiO2@PANI is as high as 30.99 emu·g−1, enabling efficient magnetic separation. It showed high selective adsorption for various synthetic dyes. The highest adsorption capacity for cationic dyes Methyl Orange and Congo Red was tested as 216.72 and 413.49 mg g−1 at pH 3, respectively, while that for anionic dyes Methylene Blue and Rhodamine B were 108.65 and 41.49 mg g−1 at pH 11, respectively. Systematic adsorption studies suggest that the pH value of the water has a significant influence on the surface properties of PANI, as well as the molecular structure and functional groups of the dyes. This could affect the interaction between PANI and dye molecules significantly. Thus, the multiple-dye adsorption performance of CMS@SiO2@PANI could be adjusted by adjusting the pH value. The adsorption kinetics and isothermal simulation results show that the dye adsorption is dominated by the monolayer chemical adsorption, and electrostatic attraction plays a vital role in the adsorption process. The multiple-dye adsorption of CMS@SiO2@PANI could be explained as a two-step process.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 35
·11788-11793
·
IF 7.393
Mengqi Xiao,Jingjing Liu,Zhijie Chen,Wenxuan Liu,Chengcheng Zhang,Yingying Yu,Chaoran Li,Le He
Photonic crystal supraparticles (PCSs) obtained by self-assembly of colloidal building blocks hold promise for applications in various areas. The majority of PCSs are based on isotropic colloidal spheres, fundamentally limiting their structural and functional diversity. Herein we demonstrate the magnetic assembly of Janus PCSs with increased complexity from a colloidal mixture of nonmagnetic spheres and magnetic ellipsoids. The key to this strategy is the use of non-uniform magnetic fields to simultaneously induce the phase separation of binary particles and assist the subsequent crystallization of anisotropic magnetic ellipsoids. Due to their different crystalline structures, the nonmagnetic and magnetic regions of Janus PCSs exhibit isotropic and anisotropic optical properties, respectively. Moreover, the structural colour can be tuned by magnetically controlling the orientation of supraparticles. Our study not only produces multi-functional PCSs with novel structures and properties but also provides a new model system for understanding the colloidal assembly of binary mixtures.
研究领域:
材料科学
·
纳米技术
·
光学
·
胶体化学
✓ 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）