Decomposition of 2‐chlorophenol, 4‐chlorophenol and 2,4,6‐trichlorophenol by catalytic oxidation over cobalt and nickel impregnated SBA‐15

Abstract

This work describes the use of Co(II) and Ni(II) impregnated SBA‐15 as catalysts for the oxidative degradation of a few persistent chlorinated phenols in an aqueous medium: 2‐chlorophenol (2‐CP), 4‐chlorophenol (4‐CP) and 2,4,6‐trichlorophenol (2,4,6‐TCP). The catalysts were characterised in terms of their crystallographic features, surface topography, functional groups, thermal stability, etc. The oxidation reactions were carried out using the reaction time, concentration of chlorophenol, amount of catalyst and pH of the reaction mixture as the process variables with or without hydrogen peroxide as the chemical oxidising agent. The conversion achieved with Co/SBA‐15 for 2‐CP, 4‐CP and 2,4,6‐TCP was respectively 84.7%, 78.4% and 64.8% with H2O2 and 86.3%, 80.2% and 70.3% in the absence of H2O2. The conversion with Ni/SBA‐15 also at 353 K for 2‐CP, 4‐CP and 2,4,6‐TCP was, respectively, 82.3%, 81.9% and 64.0% at 5 h with H2O2 and 89.5%, 82.9% and 65.6% without H2O2. The reactions followed pseudo‐first‐order kinetics. The leachability study indicated that the catalysts release very little Co and Ni to water. Therefore, the possibility of water contamination through metal leaching was almost negligible. Oxidative degradation was confirmed by measuring the total organic carbon. © 2012 Canadian Society for Chemical Engineering

SBA-15 Supported Fe, Ni, Fe-Ni Bimetallic Catalysts for Wet Oxidation of Bisphenol-A

“…This might be due to the presence of metal inside the pores, which causes an increase in the scattering power within the pores, resulting in an overall loss of intensity due to phase cancellation between the pore walls and guest metal. 13,14,23,25 In high angle PXRD, the existence of major reflections corresponding to SBA-15, even after functionalization, shows that the mesoporous SBA-15 structure is retained (Figure 2) …”

Preparation of fluorine and carbon co-introduced TiO2 at low temperature with enhanced visible-light degradation performance for 2,4,6-trichlorophenol

“…Thus, more requires immediate attention and sustainable solutions are needed. Researchers have paid many efforts on 2,4,6-TCP removal from the wastewater, such as chemical oxidation, microbial degradation, photocatalytic, ion exchange resins, catalytic oxidation processes [5][6][7][8][9].…”

Facile preparation of a Ti/α-PbO2/β-PbO2 electrode for the electrochemical degradation of 2-chlorophenol

“…Owing to estrogenic, mutagenic and carcinogenic effects, 2-chlorophenol presents a threat to both the aquatic ecosystem and human health. Accordingly, the decomposition of 2-chlorophenol in wastewater has been studied by many methods such as photodegradation [2,3], chemical oxidation [4][5][6][7], and electrochemical degradation [8,9]. Among the above reported methods, electrochemical degradation is an attractive option for the decomposition of 2-chlorophenol because of its high oxidation efficiency, fast reaction rate, amenability to automation, high energy efficien-cy, cost effectiveness, and environmentally friendly attributes [10,11].…”