Degradation of furfural in aqueous solution using activated persulfate and peroxymonosulfate by ultrasound irradiation.

Authors:

Majid Kermani Mehdi Farzadkia Maryam Morovati Mahmoud Taghavi Saeid Fallahizadeh Razieh Khaksefidi Samira Norzaee

J Environ Manage 2020 Jul 22;266:110616. Epub 2020 Apr 22.

Department of Environmental Health Engineering, Iranshahr University of Medical Sciences, Iranshahr, Iran. Electronic address:

Furfural is a toxic compound that can cause many problems for human health and the environment. In this study, we addressed the degradation of furfural in aqueous solution using the activated persulfate (SPS) and peroxymonosulfate (PMS) through the ultrasonic (US) wave. Besides, the effect of various parameters (pH, oxidizing dose, initial furfural concentration, US frequency, Inorganic anions concentration, and scavenger) on SPS + US (SPS/US) and PMS + US (PMS/US) processes were examined. The results showed, in order to furfural removal, the US had excellent efficiency in activating SPS and PMS, as in SPS/US and PMS/US processes, 95.3% and 58.4% of furfural (at 25 mg/L concentration) was decomposed in 90 min, respectively. The furfural degradation rate increased with increasing oxidizing dose and US frequency in both SPS/US and PMS/US processes. Considering the synergistic effect, the best removal rate has occurred in the SPS/US process. In the SPS/US and PMS/US processes, furfural removal increased at natural pH (pH 7), and the presence of inorganic anions such as NO and Cl had negative effects on furfural removal efficiency. Also CO and HCO acted as a radical scavenger in the SPS/US process but these anions in the PMS/US process produced more SO radicals, and subsequently, they increased the furfural degradation rate. The results also showed that the predominant radical in the oxidation reactions is the sulfate radical. This study showed that the SPS/US and PMS/US processes are promising methods for degrading organic pollutants in the environment.

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http://dx.doi.org/10.1016/j.jenvman.2020.110616	DOI Listing

July 2020

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Authors:

Kirill Fedorov Maksymilian Plata-Gryl Javed Ali Khan Grzegorz Boczkaj

J Hazard Mater 2020 10 19;397:122804. Epub 2020 May 19.

Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, 80-233, Gdańsk, 11/12 Narutowicza Str., Poland. Electronic address:

This study investigated - for the first time - the simultaneous degradation of benzene, toluene, ethylbenzene and o-xylene (BTEX) by persulfate (PS) and peroxymonosulfate (PMS) activated by asphaltenes (Asph) under ultrasound (US) irradiation. Advantageous properties such as high thermal stability, low production cost and extensive availability make asphaltenes as an appealing carbonaceous material for heterogeneous catalysis. The application of asphaltenes in PS/US increased the degradation of BTEXs from 31%, 34%, 35%, 32%-78%, 94%, 98% and 98%, while the removal of these compounds in PMS/US system was improved from 26%, 27%, 24%, 20%-76%, 91%, 97%, 97%, respectively. Read More

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