Benzoic acid is a flake or needle like crystalline with a smell of benzene or formaldehyde, usually made by selective oxidation of toluene.
Toluene is obtained by a series of oxidation processes. Benzoic acid is an important food preservative, and is also used in medicine, dye carriers, plasticizers, spices and antibacterial agents. In the traditional chemical process, the production of benzoic acid from toluene requires selective oxidation of toluene under severe conditions, such as high temperature, high pressure, and acidic solvents. Generally speaking, the process is costly and polluting.
Tungstate is a kind of photocatalyst which is widely used in industrial wastewater treatment, but some scholars have made use of the principle of petal type bismuth tungstate photocatalyst to produce benzoic acid. Because bismuth tungstate can use oxygen as oxidant to catalyze the oxidation of toluene and its derivatives, thereby simplifying the preparation of benzoic acid and reducing pollution.
In the process of studying the oxidation of benzoic acid by catalytic oxidation of toluene with bismuth tungstate, it is found that the petal like bismuth tungstate powder has the highest activity. By means of X ray diffraction, scanning electron microscopy, UV Vis absorption spectra and experimental results indicate that surface flower like bismuth tungstate powder showed the best activity for the oxidation of toluene and it is likely to be the largest surface area has a relationship. Because Bi2WO6 is excited by light, electrons are excited by light and leave holes that form electron hole pairs, these photogenerated electron hole pairs give rise to stronger oxidation and reduction signals because of their strong redox power, while electrons and holes play a corresponding role in the oxidation of toluene, thus facilitating the reduction.
In recent years, bismuth tungstate has become a new force for environmental protection because of its good photocatalytic performance, but it is rare in the application of catalysts, the reduction of benzoic acid with bismuth tungstate not only provides a new idea for the oxidation and reduction of toluene, but also provides an effective method for the green production of benzoic acid.
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