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RISS 인기검색어
- 검색키워드
- 저자 : Hongming Long (검색결과 3 건)
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Yuping Sun,Zhengwu Pan,Hongming Long,Siu Wing Or,S. L. Ho,Chao Feng,Xianguo Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.3
We describe in this report a wet chemical reduction synthetic strategy for synthesizing urchin-like Ni microspherical structures, in which the nanowires self-assembled by Ni nanoparticles with the size of 5–20 nm are assembled in a radial form from the center to the surface of the spherical oriented arrays. Urchin-like Ni microspherical structures exhibit the strong magnetic natural resonance peak at 7.0 GHz and superior magnetic loss at 2–18 GHz, originated from relatively high anisotropy energy of urchin-like shape. Electromagnetic absorption measurements show that the urchin-like Ni microspherical structures possess outstanding microwave absorption performance at 2–18 GHz. An optimal reflection loss of –21.98 dB can be observed at 17.4 GHz with a matching thickness of 1.4 mm and the effective absorption (below –10 dB, 90% absorption) bandwidth is 5 GHz (12–17 GHz) with a thickness of 1.7 mm. The excellent microwave absorption performance may be attributed to the good impedance, large attenuation constant and novel magnetic loss ability.
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Shaojie Wu,Mingyang Li,Lili Xin,Hongming Long,Xiangpeng Gao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
Conventional photocatalysts for environmental applications are mainly transitional metal compounds orprecious metal nanoparticles, which suffer from weak pollutant adsorption performance, thus limitedtheir applications for high concentrated wastewaters. In this study, asynchronous cross-linked triethylenetetraminemodified sodium alginate (CFTS) was used as photocatalyst for the simultaneouslycatalytic degradation of Cr(VI) and metronidazole (MNZ). Experimental results suggested that asynchronouscross-linking and triethylenetetramine modification have dramatically enhanced the chemicalstability as well as the adsorption and photocatalytic behavior of the material. The grafted amino functionalgroups and cross-linked Fe3+ ions can promote the rapid separation and transfer of electrons, thusreducing the recombination rate of photo-generated electron-hole pairs. The optimum removal rate of Cr(VI) has reached 99.5 % and MNZ can be completely removed within 20 and 30 min at pH 1.0 under UVlight irradiation, respectively. The removal mechanism of Cr(VI) by CFTS is the synergistic effect of electrostaticadsorption and photocatalytic reduction, while photocatalytic oxidation dominated the degradationprocess of MNZ. Moreover, the removal efficiency can be enhanced in the binary solution ofthese two pollutants due to the utilization of photo generated electron-hole pairs, which provides newpathways in the treatment of complicated pharmaceutical and domestic sewage wastewaters.
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Junchao Xu,Xiangyang Zhang,Yunlan Sun,Hongming Long,Zhimin Zheng 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.12
Pyrolysis is a very potential sludge treatment technology that is low-cost and environmentally friendly; particularly, the pyrolysis sewage sludge char (SC) can be used as a catalyst support. To improve the NO conversion efficiency of sludge char based catalysts, they were activated by potassium hydroxide and phosphoric acid, respectively. The catalysts of activated sludge char with or without Mn-Ce impregnation in the application of NO removal by lowtemperature SCR were investigated. The higher NO conversion efficiency of sludge char based Mn-Ce catalysts at low temperature were obtained. Compared with the 59% NO conversion efficiency of Mn-Ce/SC catalyst, the conversion efficiency of catalyst supported on KOH activated char (SCK) achieved 89% at 220 oC and of catalyst supported on H3PO4 activated char (SCP) reached 87% at 240 oC. The catalysts were analytically characterized using N2 adsorptiondesorption, XRD, FTIR, NH3-TPD and XPS measurements. The higher specific area, excellent dispersion of Mn-CeOx and more Brønsted acid sites are responsible for the higher NO conversion efficiency of Mn-Ce/SCK, while the higher NO conversion efficiency of Mn-Ce/SCP is enhanced by more Brønsted acid sites, oxygen-containing and some unique phosphorus-containing oxygen functional groups. It indicates that sludge char activated by KOH and H3PO4 is a potential low-temperature catalyst support.
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