Cu2O@TiO2 core-shell microspheres for naphthalene oxidation

Abstract

New Cu 2 O@TiO 2 core-shell microspheres were successfully prepared for the rst time in this paper. The XRD, N 2 adsorption-desorption, SEM, TEM, EDX and XPS characterizations were utilized to investigate the physical and chemical properties. The liquid phase oxidation of naphthalene was also carried out to test their catalytic performance. The characterization results indicating that the Cu 2 O microspheres were rstly formed by hydrothermal treatment and the rutile TiO 2 coating on the surface would be formed by the hydrolysis of tetrabutyl titanate. The Cu 2 O@TiO 2 -5.0 catalyst with the molar ratio of copper to titanium species as high as 5.0 has the largest surface area and maximum pore volume resulting from the integrated microspheres with rougher surface thickness of about 6.3 nm, and it showed higher catalytic performance in the naphthalene liquid phase oxidation. Naphthalene conversion of 43.2%, 1, 4naphthoquinone selectivity of 26.7% and phthalic anhydride selectivity of 53.4% can be obtained, and it only slightly decreased even after repeated use for 5 times. The method would provide a valuable theoretic reference for the hindrance of Cu 2 O rapid deactivation and the industrial application of the naphthalene oxidation to produce high valuable chemicals.

Microwave-assisted synthesis of oxygen vacancy associated Bi–TiO2 nanocomposite for degradation of rhodamine B under visible light irradiation

“…Thus, semiconductor-induced photodegradation is a promising method for solving these challenges. [15][16][17] Various semiconductors are proven to be favorable for the photocatalyst process, such as TiO 2 , 18 CdS, 19 Fe 2 O 3 , 20 Bi 2 WO 6 , 21 ZnIn 2 S 4 , 22 Cu 2 O, 23 and g-C 3 N 4 . 24,25 Among these semiconductors, TiO 2 is the most studied because of its excellent thermal and chemical stability, remarkable photocatalytic activity, economical price, and low toxicity.…”