Heterogeneous catalytic wet peroxide oxidation of simulated phenol wastewater by copper metal–organic frameworks

Abstract

Two different porous copper metal–organic frameworks (Cu-MOFs) named as Cu3(BTC)2 and Cu(BDC) were synthesized and applied as heterogeneous catalysts for the catalytic wet peroxide oxidation (CWPO) of simulated phenol wastewater (100 mg L−1).

Yolk‐Shell Structured Fe3O4 @ Copper Silicate as Catalyst for Catalytic Degradation of Methylene Blue

“…It can be seen clearly that the MB removal efficiency increases with the increase in the temperature. This is because the higher temperature results in the greater reaction rate (Eq.1, 2) and more available oxidizing radicals are generated . The MB removal efficiency using H 2 O 2 ‐FtCS combination catalysts is higher than 90% after the reaction time of 60 min when the temperature is above 40 °C.…”

“…The volume of H 2 O 2 used in the experiments is controlled in the range of 0.1 to 0.8 mL, according to the theoretical value of 0.18 mL that the100 mg/L MB solution (100 mL) to be mineralized completely needs. Due to the decomposition reaction of H 2 O 2 itself (Eq.4) and the existence of the key component HO⋅ with a short life, the amount of H 2 O 2 used is larger than that commonly used . However, it is not wise to add a large amount of H 2 O 2 into the system because it would result in waste and more importantly the excess of H 2 O 2 can cause the degradation rate decline according to Eq.…”

“…This is because the higher temperature results in the greater reaction rate (Eq.1, 2) and more available oxidizing radicals are generated. [7] The MB removal efficiency using H 2 O 2 -FtCS combination catalysts is higher than 90% after the reaction time of 60 min when the temperature is above 40°C. The removal efficiency could reach almost 100% at 70°C or 80°C even after 30 min.…”

“…Due to the decomposition reaction of H 2 O 2 itself (Eq.4) and the existence of the key component HO⋅ with a short life, the amount of H 2 O 2 used is larger than that commonly used. [7] However, it is not wise to add a large amount of H 2 O 2 into the system because it would result in waste and more importantly the excess of H 2 O 2 can cause the degradation rate decline according to Eq. 5 and 6.…”

“…[4] The refractory organics can be oxidized completely via interacting with HO⋅ generated by oxidants in a catalytic oxidation process in which the catalysts play a vital role. [5] Many kinds of transition metal copper-based catalysts have been investigated, such as CuS, [6] copper metal organic framework, [7] CuFe 2 O 4 , [8] iron-copper bimetallic nanoparticles, [9] which all show good catalytic performance for the degradation of organics. Besides, it has been found that the materials with magnetic yolk-shell structures have attractive properties, e. g. large surface area, functional outer shell, magnetic inner core, and low density.…”