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Preparation and characterization of BiOCl/TiO2/MMT composite materials

Tuo Biyang, Shi Xiulong, Tian Jinwang, Wang Jianli

Materials Science Poland

2023

Vol. 41, No. 2

354--367

To broaden the light response range of TiO2 and improve its photocatalytic activity, BiOCl/ TiO2 /MMT composite materials (BTMC) with outstanding photocatalytic performance were prepared by the sol-gel method with montmorillonite (MMT) as the supporting material, tetrabutyl titanate as titanium source and, bismuth nitrate pentahydrate as the bismuth source. The properties of the prepared materials were characterized by X-ray diffractometer (XRD), surface and porosity analysis (BET), scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), X-ray photoelectron spectrometry (XPS), and ultraviolet-visible diffuse reflection spectroscopy (UV-Vis DRS). When the Bi/Ti molar ratio was 20%, the composite material exhibited a slit mesoporous structure, and its specific surface area was 109.02 m2/g, with optimum photocatalytic activity. TiO2 and BiOCl formed the type-II heterojunction on the surface of MMT, which facilitates the transfer of photogenerated electrons and holes, thus enhancing the photocatalytic activity of BTMC-20. The results of this study indicated that BTMC-20 is a promising photocatalytic composite material and has better photocatalytic properties under visible light.

Dynamic analysis and experiment of underactuated double-pendulum anti-swing device for ship-mounted jib cranes

Wang Jianli, Liu Kexin, Wang Shenghai, Chen Haiquan, Sun Yuqing, Niu Anqi, Li Haolin

Polish Maritime Research

2022

nr 4

145--154

This paper proposes a three degrees of freedom parallel anti-swing method by the main and auxiliary cables to address the problems related to underactuated double-pendulum anti-swing for a ship-mounted jib crane. By analysing the dynamic coupling relationship between the swing of the hook and the payload, it seeks to establish an accurate dynamic model of the anti-swing device under the ship’s rolling and pitching conditions, and discusses the influence of ship excitation, the crane state, load posture and anti-swing parameters on the in-plane and out-of-plane swing angles. The analysis shows that the primary pendulum reduces the in-plane angle by 90% and the out-of-plane angle by 80%, the in-plane angle of the secondary pendulum is reduced by 90%, and the out-of-plane angle is reduced by 80%. The reliability of the simulation data is verified through experiments.