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Yingliang Tian,Wencai Liu,Yongqiang Lu,Shibing Sun 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.5
La1-xSrxMnO3-α(LSMO) and LaMnO3+α(LMO) nanoparticle catalysts have been synthesized via a one-step molten salt route. It was found that the partial substitution of lanthanum by strontium had a promoting effect on the catalytic performance for toluene oxidation. Under the condition of toluene concentration=1000 ppm, toluene/O2 molar ratio=1/200 and the space velocity=20000 mL/(g h), the temperature required for 50% and 90% toluene combustion conversion was 150℃ and 205℃ over LSMO catalyst, respectively. It is concluded that the oxygen vacancy, the molar ratio Mn4+/Mn3+ on the surface and the specific surface area contribute to the improved catalytic performance of the LSMO nanoparticle materials via a one-step molten salt method.
Chaofan Hu,Yingliang Liu,Jianhua Rong,Qingqing Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.8
A novel strategy toward one-pot hydrothermal synthesis of copper sulfide nanoplates-decorated reduced graphene oxide (RGO–CuS) composites was developed. CuS nanoplates were successfully loaded onto the surface of RGO in the hydrothermal procedure, which was confirmed by transmission electron microscopy, UV-Vis–NIR and Raman spectroscopy. The as-synthesized RGO–CuS composites showed pronounced enhanced optical absorbance in near infrared (NR) region and higher photothermal conversion efficiency than noncomposite GO and CuS nanoplates. The RGO–CuS materials were used in photothermal ablation of cancer cells with a 980 nm laser irradiation and showed improved performance than CuS nanoplates.
Ruiheng Yue,Yingliang Liu,Shaoling Xia,Shengang Xu,Shaokui Cao 한국고분자학회 2022 Macromolecular Research Vol.30 No.7
The strengthening mechanism of graphene derivatives in the polymer composites is an interesting issue, which exhibits the excellent mechanical and tribological properties. In this case, the visual observation about the existing state of graphene nanosheets in the polymer composites is much more attractive to explain the intrinsic origin of graphene-strengthening mechanism. At present, the Raman imaging via nondestructive spectroscopic detection is an impactful tool to observe the carbonaceous materials in the graphene nanocomposites. Therefore, the Raman imaging will be applied in this work to detect the existing state of graphene oxide (GO) nanosheets in GO-hybrid polyurethane (PU)/epoxy (EP) interpenetrating polymer network (IPN) with an aim to make clear the GO-strengthening mechanism in GO-hybrid PU/EP IPN. The results obviously indicated the GO nanosheets are chemically bonded between polyurethane and epoxy, which is a key factor to mechanically strengthen GO-hybrid PU/EP IPN by transferring the polymeric stress to the GO nanosheets with high mechanical strength. Besides, the graphitization of GO nanosheets on the tribological surface of GO-hybrid PU/EP IPN is also evidently identified by Raman imaging, which provides a powerful evidence for the improvement of tribological performance in GOhybrid PU/EP IPN. This work provided the powerful visual Raman imaging proofs for the mechanically/tribologically-strengthening mechanism of GO-hybrid PU/EP IPN, including the appearance of mechanical/tribological quasi-steady state.
The simultaneous photocatalytic degradation of phenol and reduction of Cr(VI) by TiO2/CNTs
Langhuan Huang,Qizhong Chan,Xiaojing Wu,Houjin Wang,Yingliang Liu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
The main objective of this paper is to verify the potential of TiO2/CNTs in the simultaneous photocatalytic degradation of phenol and reduction of Cr(VI). From the present results it can be concluded that there is a synergistic effect between the photocatalytic degradation of phenol and reduction of Cr(VI). Under all tested conditions, the degradation of phenol and reduction of Cr(VI) were examined to follow pseudofirst-order kinetic. The rate constant of 40 mg/L of Cr(VI) was evaluated as 4.34 103 min1 in the absence of phenol, and was increased up to 9.27 103 min1 by adding 10 mg/L of phenol, and to 10.73 103 min1 by adding 15 mg/L of phenol. The presence of Cr(VI) also accelerated the degradation process of phenol, with a factor of 1.84–3 times. Such a great synergistic effect was likely to be attributed to two kinds of effects from CNTs: adsorption effect and electron trap effect. The synergistic effect induced by CNTs was also confirmed by the detection of degradation intermediates of phenol.
Jiemin Qiu,Weihao Ye,Congcong Chen,Zhiqiang Xu,Chaofan Hu,Jianle Zhuang,Hanwu Dong,Bingfu Lei,Guangqi Hu,Yingliang Liu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
UV absorbers are sustainable substances that inhibit the ultraviolet (UV) radiative degradation of polymers. In previous reports, the as-prepared carbon dots (CDs) possess only an absorption band at UVA(320–400 nm). To achieve broad-spectrum UV absorption (200–400 nm), increasing the concentrationof the CDs solution becomes common. However, a high concentration solution seriously affects the lighttransmittance due to its heavy yellow color. Furthermore, the promising organic UV absorbers cannotachieve broad-spectrum UV absorption. In this work, we initially synthesized three-component watersolublecarbon dots (OP–CDs), which delivers an excellent UV absorption (98 % UVA and 100 % UVB atthe concentration of 1.7 102 mg/mL; 99 % transmittance in visible light). Moreover, OP–CDs exhibitoutstanding stability at high temperatures and different pH. With the corporation of OP–CDs and polyvinylalcohol (PVA), a high-performance UV-shielding film was formed, leading to enhanced broadspectrumUV shielding performance and improved mechanical properties, resistance of photocatalyticactivity and anti-UV aging ability compared with pure PVA film. Notably, the PVA film remains hightransparency with the addition of OP–CDs. The study suggests that the corporation of OP–CDs and polymersis effective in anti-UV degradation.