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- 저자 : Guangxu Zhang (검색결과 4 건)
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Dingkun Yuan,Kang Zhang,Lijian Wang,Lingfeng Jin,Xutao Guo,Guangxue Zhang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
Biomass is carbon-neutral and has the carbon-negative potential if combined with carbon capture andstorage (CCS). This study investigated the thermochemical conversion to high-purity hydrogen of a typicallignite (BYH) and seaweed biomass (BS) with carbon capture in a designed fixed-bed reactor at moderateconditions (1 atm, 873 K). High-purity hydrogen of 486.91–801.5 ml/g-blends with suppressed CO2formation was produced in the alkaline gasification. The alkali can decompose the coal/biomass molecularstructures, in-situ capture CO2 and control the gases to high-purity H2 (80.1%–93.2%). The synergisticeffect of coal and biomass changes the gas evolution behaviors and impacts the chemical structures of thechar. The abundant SiO2 and Al2O3 in the coal can inhibit the catalytic activities of earth alkali metals inthe biomass, but not much. These results are significant to the future development of low-carbon renewableenergy techniques.
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Efficient removal of methylene blue in aqueous solution by freeze-dried calcium alginate beads
Yafei Zhao,Hongsong Zhang,Guangxue Liu,Zonggao Hu,Rouwen Guan,Bing Zhang 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
Novel porous calcium alginate beads were prepared via crosslinking of calcium followed by freeze drying for investigating the adsorption performance for methylene blue. These beads possessed reduced shrinkage, highly porous lamellar structure and high specific surface area, and exhibited enhanced adsorption capacity and much faster adsorption rate compared to the non-porous beads obtained with conventional oven drying method. Methylene blue adsorption capacity increased with increasing of initial concentration and pH, while decreased with increasing of temperature. The adsorption process fitted well with the pseudo-second-order kinetic model and the Langmuir isotherm. The maximum adsorption capacity was 961.5mg g−1 at 298.15 K. After eight successive adsorption-desorption cycles, the adsorption capacity had negligible decrease. Owing to the high adsorption capability, rapid adsorption rate, easy recovery and reusability, the freeze-dried beads imply a prospective, biodegradable and attractive adsorbent for removing contaminants from wastewater.
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A RIF Based Mapping of RDB2RDF
Ying Chen,Zhuoming Xu,Yuyan Ni,Guangxu Cao,Shiqing Zhang 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.6
Mapping RDB to RDF (i.e., RDB2RDF) is the key to constructing the Semantic Web, hence has been an active research field during the last decade. Many technically heterogeneous RDB2RDF tools resulted in non-interchangeable and unreusable RDB2RDF mapping descriptions. In 2009, the W3C RDB2RDF Incubator Group Report once strongly suggested that the RDB2RDF mapping language be expressed in rules as defined by the W3C Rule Interchange Format (RIF) Working Group, because rules are an effective way to express mappings between information models, and RIF, as part of the infrastructure for the Semantic Web, is now a standard for exchanging rules among Web rule systems. This paper addresses the issue of RIF-based RDB2RDF mapping and proposes a database semantics-driven, RIF Production Rule Dialect (RIF-PRD) based mapping description approach. The work includes defining a set of generic RIF-PRD mapping rules for RDB2RDF, developing a prototype mapping engine called RIFD2RME (stands for RIF-based RDB2RDF Mapping Engine), and conducting case study experiments with the prototype. The experimental results indicate that the proposed mapping approach is achievable and effective.
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Xiangshan Li,Yong Zhu,Dachuan Xia,Zhanke Wang,Guangxu Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
A novel amino-anchored sulfonic acid functional heteropolyacid ionic liquid ([NHSO]3PW12O40) wasdesigned, synthesized and used as a catalyst in the Baeyer-Villiger (BV) oxidation of cyclohexanone tosynthetic e-caprolactone (e-CL). The catalyst was well characterized by FT-IR, XRD, 1H NMR, XPS, TGDTAand SEM analysis methods, which showed that the tungsten phosphate anion (PW12O403) was successfullymodified from the sulphonate-functionalised IL precursor NHSO and formed a new hydrogenbond between the introduced –NH2 group and PW12O403. The combined effect of ionic bonds and hydrogenbonds contributed to the good stability of the catalyst. Catalyst activity evaluation experiments confirmedthat [NHSO]3PW12O40 exhibited superior performances such as a cyclohexanone conversion of86% and e-CL yield and selectivity of 82% and 95%, respectively. Furthermore, [NHSO]3PW12O40 couldbe recovered by simple treatment and the activity of the catalyst did not decrease significantly after fivereplicae experiments. In addition, the reaction kinetics and mechanism of the catalyst were investigatedand a simple validation was given in conjunction with the bond energy changes of the catalyst during thereaction. The innovative of the green, stable and high-performance functionalised heteropolyacid IL catalystprovides a new solution for the efficient production of e-CL.
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