Wet air oxidation of cresylic spent caustic - A model compound study over graphene oxide (GO) and ruthenium/GO catalysts.

Title Wet air oxidation of cresylic spent caustic - A model compound study over graphene oxide (GO) and ruthenium/GO catalysts.
Authors A.S. Barge; P.D. Vaidya
Journal J Environ Manage
DOI 10.1016/j.jenvman.2018.01.066
Abstract

Wet air oxidation (WAO) is a candidate technique for the effective treatment of spent caustic wastewater. In this work, cresols were chosen as model compounds to represent cresylic spent caustic wash. Graphene oxide (GO) is a promising catalyst as well as support for the wet oxidation process, due to its unique structure and properties. For the first time, GO and ruthenium supported on graphene oxide (Ru/GO) were employed for WAO of cresylic isomers. The aforesaid materials were synthesized by modified Hummer's method and characterized using scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) analysis. The performance of the investigated materials for WAO of cresols was studied in a slurry reactor. The best reaction conditions for GO were 175?°C and 0.69?MPa Opressure. Total organic carbon (TOC) degradation achieved at these conditions was 54.9, 48.9 and 61.2% for o-cresol, m-cresol and p-cresol, respectively. The amount of TOC degradation obtained by using Ru/GO at the same reaction conditions was 66.4, 53.4 and 73.9% for o-cresol, m-cresol and p-cresol, respectively. It was found that the order of reactivity for cresols was p-cresol?>?o-cresol?>?m-cresol. Finally, kinetics of TOC destruction during CWAO of p-cresol over GO was described using a two-step power law model.

Citation A.S. Barge; P.D. Vaidya.Wet air oxidation of cresylic spent caustic - A model compound study over graphene oxide (GO) and ruthenium/GO catalysts.. J Environ Manage. 2018;212:479489. doi:10.1016/j.jenvman.2018.01.066

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Ruthenium

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Carbon

See more Carbon products. Carbon (atomic symbol: C, atomic number: 6) is a Block P, Group 14, Period 2 element. Carbon Bohr ModelThe number of electrons in each of Carbon's shells is 2, 4 and its electron configuration is [He]2s2 2p2. In its elemental form, carbon can take various physical forms (known as allotropes) based on the type of bonds between carbon atoms; the most well known allotropes are diamond, graphite, amorphous carbon, glassy carbon, and nanostructured forms such as carbon nanotubes, fullerenes, and nanofibers . Carbon is at the same time one of the softest (as graphite) and hardest (as diamond) materials found in nature. It is the 15th most abundant element in the Earth's crust, and the fourth most abundant element (by mass) in the universe after hydrogen, helium, and oxygen. Carbon was discovered by the Egyptians and Sumerians circa 3750 BC. It was first recognized as an element by Antoine Lavoisier in 1789.

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