Abstract
Sea urchin-like cuprous oxide with hollow glass microsphere as core was prepared using sodium sulfite as the reducing agent and sodium acetate-acetic acid as buffer solution in copper sulfate solution. Methyl orange was selected as degradation target for photocatalytic experiments. The photocatalytic activities were investigated by visible spectro- photometer. Photocatalytic kinetics parameters were studied by the Langmuir-Hinshelwood model and Arrhenius formula. It was observed that the sea urchin-like morphology dramatically improved the photocatalytic activity of cuprous oxide. The photo-degradation belongs to the first-order reaction and the maximum degradation rate could reach 94.37%. The activation energy and pre-exponential factor are 41.18 KJ·mol-1 and 1.07 × 106, respectively. After seven times recycling, the sample still showed high photo-catalytic efficiency and stability.
Highlights
Dye wastewater with the characteristics of complex composition, high color and emissions, high toxicity and poor biodegradability has serious polluted the environment
Compared with diffrentCu2O list in Table 1, sea urchin-like Cu2O showed much higher photocatalytic activity due to the three reasons. (a) Needle-like whiskers increase the surface area that determined by BET method is 3.3961 m2/g
While the BET surface areas of the octahedral morphology and the truncated octahedral morphology are 0.0308 m2/g and 0.1819 m2/g, respectively [13]. (b) The large area exposure of the Cu2O whiskers, in which visible light can occur numerous times of reflection and diffuse reflection, augments the adsorption ability and utilization rate of visible light. (c) The width size of crystal whiskers of the sea urchin-like Cu2O is only about 100 nm, so OH species formed could reach the surface of the crystal whiskers to oxidize methyl orange (MO)
Summary
Dye wastewater with the characteristics of complex composition, high color and emissions, high toxicity and poor biodegradability has serious polluted the environment. Cu2O with various morphologies, such as nanosize spheres [6], sea urchin-like [7], porous octahedron [8], nanowires [9] [10], bi-pyramids [11] star-like and flower-like [12], has been synthesized by different techniques. (2016) Kinetics Study on Photocatalytic Degradation of Methyl Orange Catalyzed by Sea Urchin-Like Cu2O. Various kinetics parameters including the reaction rate constants, the activation energy, the pre-exponential factor and the reaction order were obtained and the stability property of the sea urchin-like Cu2O was studied
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Materials Science and Chemical Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
