The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adsu.201700165.
PhotocatalysisSoluble Cr(VI) species are commonly generated in various industries. It is important to develop strategies for their removal from the industrial effluent stream as well as in wastewater treatment plants. [1] According to the latest standards for drinking water quality set by the World Health Organization, [2] the total chromium content in potable water should less than 0.05 mg L −1 . For industrial wastewater discharge, the total chromium emission limiting value is 1.5 mg L −1 and that for Cr(VI) is 0.5 mg L −1 according to the Chinese standard GB8978-1996. Chromium is one of the most important strategic materials that is widely used in metallurgical industry, refractory materials, and chemical industry. The removal, recovery, and recycling of chromium from chromium-containing wastewater is of strategic importance for environment protection and resource recycling.
This
work presents a strategy to convert the Cr(VI) pollutant in
wastewater into active Cr catalysts in one step by simultaneous photoreduction
and deposition using ZrO2 nanoparticles as the photocatalyst
and support. Both highly dispersed Cr(0) and Cr2O3 were found on the surface of the resultant Cr/ZrO2 catalyst
after UV irradiation. After photoreduction treatment, no residual
chromium was detected in post-treated water. The resultant Cr/ZrO2 was found to be an active catalyst for selective dehydrogenation
of ethane. It is slightly more stable and active than that prepared
by the impregnation method. The interconversion between the structures
of Cr–O–Cr and CrO should be the active site
for oxidative dehydrogenation of C2H6 with CO2. An ethylene yield as high as 17.0% was achieved at 650 °C.
This work proved that producing supported metal catalysts from the
corresponding metal contaminated wastewater via proper one-step procedure,
such as photoreduction treatment, is a feasible strategy to meet the
ever-increasing stringent environmental requirements with better economic
efficiency.
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