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Microwave-assisted modification of activated carbon with ammonia for efficient pyrene adsorption
Xinyu Ge,Zhansheng Wu,Zhilin Wu,Yujun Yan,Giancarlo Cravotto,Bang-Ce Ye 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
With the aim to enhance the adsorption properties of polycyclic aromatic hydrocarbons (PAHs) fromaqueous solutions, coal-based activated carbon (CAC) was modified with three different protocols: (i)ammonia treatment (A-CAC), (ii) microwave radiation (M-CAC) (iii) and combined microwave radiationin the presence of ammonia (MA-CAC). The original CAC and all the modified samples were characterizedby SEM, nitrogen adsorption–desorption, Boehm method, point of zero charge, FTIR and XPS. The surfacearea increased from 764.96 to 1293.78 m2/g for CAC and MA-CAC, whereas the total oxygen-containinggroups decreased from 1.57 to 0.25 mmol/g. The pyrene adsorption capacity of all the modified sampleswas higher than CAC and the adsorption process for pyrene to the equilibrium needed only 40 min. Adsorption of pyrene on CAC and MA-CAC varies from the monolayer to multilayer process. The filmdiffusion could control the adsorption rate of pyrene onto carbons. The adsorption capacity of the CACand modified samples had a good positive correlation with surface area, carboxyl groups, and lactonesgroups. The modified samples, especially MA-CAC, showed an enhanced adsorption of pyrene openingthe way to a more general application as efficient adsorbent for PAHs contaminant.
Sensorless Control of the Switched Reluctance Motor Based on the Sliding-Mode Observer
Li Xinyu,Liu Jiayu,Ge Lefei,Zhong Jixi,Huang Jiale,Zhao Yuchen,Song Shoujun 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
To upgrade the application of switched reluctance motors (SRMs) for more electric aircraft, this paper presents a method with sensorless control based on the flux-linkage data from the finite element method. First, a calibration strategy is employed to obtain the flux-linkage characteristics. Then, a sliding-mode observer is used to realize the sensorless control of the SRM. The proposed method only requires the flux-linkage of the SRM at aligned and unaligned rotor positions from the experiment which takes a low-measurement effort to get the rotor position and has better accuracy in position and speed estimation than the FEM. Experimental results verify the accuracy and effectiveness of the proposed method.
Pengfei Chen,Xiaoquan Dai,Pingxing Xing,Xinyue Zhao,Qingle Zhang,Shifeng Ge,Jianxiao Si,Leihong Zhao,Yiming He 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Novel SnSe/g-C3N4 photocatalysts were one-step synthesized via a microwave heating assisted process in35 min with SnSe and melamine as precursors. The as-synthesized SnSe/g-C3N4 worked very well in H2evolution via photocatalysis. Under simulated sunlight, the best SnSe/g-C3N4 sample displayed a H2-production velocity of 1064 mmol g 1 h 1, which is 1.8 folds faster than that of neat g-C3N4. Similarpromotion effect was also observed under visible light. To reveal the nature behind the highphotoactivity, a thorough investigation was performed. XRD and XPS experiments proved the binaryconstitution of the composite. DRS experiment demonstrated that the addition of SnSe improved thephotoabsorption performance. N2-adsorption analysis showed that the SnSe/g-C3N4 photocatalystpresented similar surface area as g-C3N4. TEM experiments showed that some bulk SnSe werespontaneously decomposed to nanoparticles andfinely dispersed in g-C3N4 during the microwaveheating process. These SnSe nanoparticles were believed to be the active phase and constructed aheterojunction structure with g-C3N4, resulting in the enhanced charge separation. This conclusion wasconsidered as the key factor leading to the high H2-evolution performance and was further confirmed bythe PL, EIS, and PC experiments. The present work provides a feasible and rapid method for theconstruction of g-C3N4 based photocatalysts.
Fei Tian,Zhansheng Wu,Yujun Yan,Xinyu Ge,Yanbin Tong 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.7
A microwave-assisted synthetic method to form a series of AC/TiO2 for application as photocatalytic degradation of formaldehyde (HCHO) is presented. The influence of prepared conditions such as microwave power, microwave time, and the ratio of activated carbon and titanium dioxide sol (AC/TiO2-sel) on the degradation of HCHO was investigated. HCHO conversion of 58.68% was achieved by AC/TiO2 at microwave power of 700W for 15 min with AC/TiO2-sel ratio of 1 : 2, which maintained multiple properties including high content of anatase and TiO2 largely distributed on AC without reunion, and possessed abundant functional groups for degradation. The influence of operation parameters on the degradation was also investigated: increasing dosage of catalyst and decreasing the initial concentration of HCHO could increase the conversion of HCHO. Acidic conditions can promote degradation effect. Stronger intensity of UV irradiating could improve efficiency of photocatalytic conversion of HCHO.