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RISS 인기검색어
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- 저자 : SHAOMING HUANG (검색결과 4 건)
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Optimization of photocatalytic degradation of Cefradine using a “green” goethite/H2O2 system
Ruiping Li,Shaoming Hong,Xiaocong Li,Bin Zhang,Hailin Tian,Yingping Huang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
An environmental friendly photocatalyst, goethite in the presence of H2O2, was used to remove Cefradinefrom aqueous solution. Four factors were examined using Box–Behnken Design and results wereanalyzed by response surface method. H2O2 concentration had the largest effect on Cefradine removaland the optimal reaction conditions were: H2O2 concentration, 4 mmol/L; solution pH, 5; goethitedosage, 1.2 g/L and illumination time, 9 h. Experimental data on Cefradine removal under optimalconditions closely coincided with model predictions, validating the model. Hydroxyl radicals ( OH) andsuperoxide anion were involved in the Cefradine photodegradation process and that OH makes thelarger contribution.
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ZHI YANG,HUAGUI NIE,XUEMEI ZHOU,ZHEN YAO,SHAOMING HUANG,XIAOHUA CHEN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.4
Nebulized spray pyrolysis (NSP) offers ease of scaling into an industrial scale process method for large-scale CNT synthesis. In the method, ultrasonic frequency plays an important role in the formation of well-aligned carbon nanotubes (CNTs). In this work, we obtain well-aligned CNTs with high quality by optimizing ultrasonic frequency via the NSP method. SEM, TEM and HRTEM results show that the aligned CNTs obtained under an ultrasonic frequency of 1.8 MHz have good alignment, uniform nanotube length (~200 μm), high density and no trace of other carbon nanoparticles. The Raman spectra result further confirms that the aligned CNTs have a high graphitization degree. Furthermore, we find that ultrasonic frequency is an important factor in determining the nanotube diameter. The higher the ultrasonic frequency, the smaller the nanotube diameter. This rule may be very helpful in the preparation of large-scale well-aligned CNTs with high quality and diameter-controlled at low cost.
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Growth of Single-Walled Carbon Nanotubes from Well-Defined POSS Nanoclusters Structure
Yunyun Liu,Yali Hu,Qiran Cai,Xiangju Xu,Yin Chen,SHAOMING HUANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.1
High-quality single-walled carbon nanotubes (SWNTs) with narrow diameter distribution can be generated from well-defined Si8O12 nanoclusters structure which form from thermal decomposition of chemically modi¯ed polyhedral oligomeric silsesquioxane (POSS). The nanosized SixOy particles were proved to be responsible for the SWNT growth and believed to be the reason for the narrow diameter distribution of the as-grown SWNTs. This could be extended to other POSS. The SWNTs grown from the nanosized SixOy particles were found to be semiconducting enriched SWNTs (s-SWNTs). A facile patterning technology, direct photolithography, was developed for generating SWNT pattern, which is compatible to industrial-level fabrication of SWNTs pattern for device applications. The metal-free growth together with preferential growth of s-SWNTs and patterning in large scale from the structure-defined silicon oxide nanoclusters not only represent a big step toward the control growth of SWNTs and fabrication of devices for applications particularly in nanoelectronics and biomedicine but also provide a system for further studying and understanding the growth mechanism of SWNTs from nanosized materials and the relationship between the structure of SWNT and nonmetal catalysts.
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ZHI YANG,HUAGUI NIE,XUEMEI ZHOU,ZHEN YAO,SHAOMING HUANG,XIAOHUA CHEN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.3
The precursory carbon source is one of the key parameters which govern the formation of carbon nanotubes (CNTs). In this work, by selecting four homologous series, namely n-pentane, n-hexane, n-heptane and n-octane, as investigated targets, we comparatively study the relationship between thermodynamic properties of the precursory carbon source and formation of aligned CNTs. We find that all of these alkanes are favored for the growth of aligned CNTs in a suitable growth environment. But only n-heptane can yield the aligned CNTs with relatively high quality, high yield and narrow diameter distribution. Furthermore, after considering the link between thermodynamic properties of the precursory carbon source and the morphology characteristic of the nanotube samples, we find that the Gibbs free energy and formation enthalpy of precursory carbon sources play critical roles in the nanotube formation. In additions some possible explanations are proposed to better understand these phenomena. These rules will be very helpful in making clearer the formation mechanism from the precursory carbon sources to the CNTs, and preparing large-scale aligned CNTs with diameter control at low cost.
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