title: New insights on degradation of methylene blue using thermocatalytic reactions catalyzed by low-temperature excitation.
abstract: Although photocatalysis has been actively surveyed on removing organic pollutants in ultraviolet (UV) environment, because of lacking UV in solar exposure, photodegradation is difficult to be considerably degraded in conventional exposure condition. In this work, an innovative approach was proposed to compensate for it, which was developed in model wastewater using thermal sensitizer at room temperature. At the optimal component condition, the removal rate of adsorption and thermocatalytic degradation processes can reach the highest level of 82.07% solely response to temperature in the dark. Moreover, the kinetics of degradation rate was modeled considering that it was found similarly to Langmuir-Hinshelwood behavior, and a tentative mechanism was objectively established, describing reasonably well in line with the experimental results. On the other hand, it was found that high amount of methylene blue (MB) adsorbed onto thermal sensitizer was of unambiguous importance to subsequent thermocatalytic performance. Briefly, all above suggest that the feasibility to the thermodegradation route has been successfully verified under room temperature excitation. Herein the insight into degradation pattern of dye over thermal excitation may further enlarge applications for wastewater treatment.
authors.affiliation: School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China. lxg@swust.edu.cn
authors.forename: Xuegang
authors.initials: X
authors.lastname: Luo
authors.forename: Sizhao
authors.initials: S
authors.lastname: Zhang
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Lin
mesh_terms: D000327:Adsorption; D002384:Catalysis; D003080:Cold Temperature; D004396:Coloring Agents / Q000737:chemistry; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry*; D010782:Photolysis; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D008751:Methylene Blue; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Adsorption; Mechanism; Methylene blue; Thermal sensitizer; Thermocatalytic degradation