Controlled synthesis and photocatalytic performance of waxberry-like Ni 11 (HPO 3 ) 8 (OH) 6 microballs
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ijian Penga) School of Engineering and Technology, China University of Geosciences, Beijing 100083, People’s Republic of China
Xiuli Fub) State Key Laboratory of Information Photonics and Optical Communications, and School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, People’s Republic of China (Received 8 January 2017; accepted 4 April 2017)
Due to the increasingly severe environmental pollution problems, the development of semiconductor photocatalysts is being extensively carried out because they have exhibited high activities for the degradation of many organic and inorganic pollutants. In this study, waxberrylike Ni11(HPO3)8(OH)6 microball photocatalysts with a diameter of 10–20 lm have been successfully synthesized via a solvothermal route by using NiSO4 as a Ni-source and NaH2PO2 as a P-source in a mixture of ethylene glycol and water under the optimized conditions with a Ni:P molar ratio of 1:2 at 200 °C for 16 h. The as-prepared photocatalysts were characterized by powder X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis, Brunauer–Emmett–Teller N2 adsorption, zeta potential, ultraviolet-visible (UV–vis) absorption, and photocatalysis tests. The decolourization of organic dyes, methylene blue and rhodamine B, under ultraviolet light over the as-prepared products reveals an excellent photocatalytic performance due to the good absorption for ultraviolet light.
I. INTRODUCTION
It is well known that one of the keys to attain an excellent property of an inorganic material is to control its size and shape.1,2 Therefore, since the discovery of nanomaterials, the construction of nanosized inorganic semiconductor materials with novel morphology has attracted extensive attention, owing to their fundamental and practical importance for optoelectrochemical performance as well as many other properties.3–6 In particular, since Marcos et al.7,8 first reported the preparation of M11(HPO3)8(OH)6 (M 5 Zn, Ni, and Co) in 1993, transitional metal phosphates have received much attention on account of their rich structural chemistry and wide potential applications in ion-exchange, electrochemistry, optics, magnetism, and catalysis.9–14 Recently, increasing interest has been even paid on the synthesis of their nanostructures with specific morphology and controlled size. For example, Wen et al. prepared peony-like cobalt hydrogen phosphate hydroxide nanostructures by Contributing Editor: Akira Nakajima Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2017.154
a solvothermal method through using Co(NO3)2 and H3PO4 as the reactants in the presence of CH3NH2 and HO(CH2)2OH at 120 °C for 5 days, and carefully investigated their low-temperature magnetic properties.15 Zhang et al. reported the hydrothermal synthesis of hierarchical Ni11(HPO3)8(OH)6 superstructures by employing NaH2PO2H2O and NiCl26H2O as the reactants with the assistance of CH3COONa3H2O and polyvinylpyrrolidone at 170 °C for
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