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Gao Yan,Liang Xilong,Han Shuangping,Wu Liang,Zhang Guofeng,Qin Chengbing,Bao Shanxia,Wang Qiang,Qi Lele,Xiao Liantuan 한국탄소학회 2020 Carbon Letters Vol.30 No.2
Carbonaceous materials are considered as potential adsorbents for organic dyes due to their unique structures which provide high aspect ratios, hydrophobic property, large efcient surface area, and easy surface modifcation. In this work, graphene nanoribbons (GNRs) were prepared by atomic hydrogen-induced treatment of single-walled carbon nanotube (SWCNTs), which inspire the idea of cutting and unzipping the SWCNTs carpets with the modifed in molecules prevent because of the unfolding of the side-walls. The unfolded spaces and uniform vertical arrangement not only enhance the active surface area, but also promote the electrostatic and π–π interactions between dyes and GNRs. The improved adsorption capacity of GNRs beyond original SWCNTs can be determined by the adsorption kinetics and isotherm, which are evaluated through adsorption batch experiments of the typical cationic methylene blue (MB) and anionic orange II (OII) dye, respectively. It is shown that the adsorption kinetics follow a pseudo second-order model while the adsorption isotherm could be determined by Langmuir model. The results reveal that the maximum adsorption capacities of GNRs for MB and OII are 280 and 265 mg/g, respectively. The GNRs present the highly efcient, cost efective, and environmental friendly properties for the commercial applications of wastewater treatment.
Zhifeng Shang,Yingke Ren,Guoquan Nie,Xilong Ma,Xing Gao 한국전기전자재료학회 2024 Transactions on Electrical and Electronic Material Vol.25 No.2
Two-dimensional/three-dimensional (2D/3D) hierarchical structure has attracted extensively attention in recent years due to their stability and the enhanced open-circuit voltage of perovskite solar cells. However, the solution processed thin 2D perovskite layers on the surface of 3D perovskites would lead to undesirable intermixing between the two phases, impeded carrier transport. Here, we present a novel approach for fabricating 2D perovskite on 3D perovskite using vapor-assisted solution deposition. Unlike what is normally observed in solution-processed 3D/2D systems, a flat interface formed in the 2D/3D bilayer heterostructure. The vapor-deposited 2D perovskite capping layer promotes efficient electron and hole separation processes and significantly restrain non-radiative charge recombination. This innovative stable and low-cost architecture will enable the timely commercialization of perovskite solar cells.
Liu Bin,Yang Hongrun,Lv Huanwen,Li Lan,Gao Xilong,Zhu Jianping,Jing Futing 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.7
A new method of X-ray source spectrum estimation based on compressed sensing is proposed in this paper. The algorithm K-SVD is applied for sparse representation. Nonnegative constraints are added by modifying the L1 reconstruction algorithm proposed by Rosset and Zhu. The estimation method is demonstrated on simulated spectra typical of mammography and CT. X-ray spectra are simulated with the Monte Carlo code Geant4. The proposed method is successfully applied to highly ill conditioned and under determined estimation problems with a good performance of suppressing noises. Results with acceptable accuracies (MSE < 5%) can be obtained with 10% Gaussian white noises added to the simulated experimental data. The biggest difference between the proposed method and the existing methods is that multiple prior knowledge of X-ray spectra can be included in one dictionary, which is meaningful for obtaining the true X-ray spectrum from the measurements.