Preparation and characterization of mesoporous g-C 3 N 4 /SiO 2 material with enhanced photocatalytic activity
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Preparation and characterization of mesoporous g-C3N4/ SiO2 material with enhanced photocatalytic activity Li Peng1, Zi-wei Li1, Ren-rong Zheng1, Hui Yu1,a)
, Xiang-ting Dong1
1
School of Chemistry & Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, People’s Republic of China Address all correspondence to this author. e-mail: [email protected]
a)
Received: 4 February 2019; accepted: 8 March 2019
Composite materials include various components with different structures, which cooperatively increase their properties and extend their application. In this study, the graphitic carbon nitride (g-C3N4) guest material was assembled into the porous of the SiO2 aerogel, which was prepared during the gel process. By this way, the g-C3N4 could be absolutely encapsulated into the porous of the disordered porous SiO2 aerogel. The prepared g-C3N4/SiO2 composite had a loose porous structure and exhibited the much higher photocatalytic activity to the photodegradation of rhodamine B (RhB) under visible light. The disordered porous structure enhanced photocatalytic activity, and the degradation rate reached to 96.42% in 90 min under the irradiation of visible light, which could be attributed to its high surface area and effective electron–hole separation rate. The catalyst had the much higher stability and could be easily recycled utilization. The prepared composites could be applied to degrade organic pollutants in wastewater.
Introduction The mesoporous silicon dioxide has been concerned for its high adsorption capacity, high chemical stability, modification property, and controllable aperture morphology. Many effective means have been discovered to synthesize the mesoporous silicon dioxides [1, 2, 3]. Since the MCM-41 synthesis [4], many morphology mesoporous materials have been synthesized. Yu et al. synthesized particular symmetrical mesoporous silicon dioxide sphere [5]. The mesoporous materials have large surface area, regular arrangement, and adjustable pores [6, 7]. These properties make mesoporous silicon dioxide an ideal hosts for the adsorption sites of active molecules, and it has been devised in some fields, such as applications in battery and photocatalysis. In addition, a large number of electrons are bound to the inside and outside surfaces of the pores of mesoporous SiO2, which effectively inhibit fleetly recombination of photogenerated electron– hole pairs. This porous structure facilitates the production of active sites, and improves the efficiency of catalytic. Similarly, this specific surface area expanding idea was also applied in the field of absorbing waves [8, 9]. The porous silicon dioxides are crystalline or amorphous materials with uniform mesoporous.
ª Materials Research Society 2019
Since Fujishima and Honda’s report [10], the researches on semiconductor-based photocatalysis has been motivated, and the metal oxide nanomaterials have been used to clean up organic pollutants through photodegradation. Semiconductorbased photocatalysis has attracted increasing a
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