Wastewater treatment by catalytic wet air oxidation process over Al-Fe pillared clays synthesized using microwave irradiation

doi:10.1007/s11783-017-0971-1

Front. Environ. Sci. Eng.

2018, Vol. 12

Issue (1) : 2 https://doi.org/10.1007/s11783-017-0971-1

RESEARCH ARTICLE

Wastewater treatment by catalytic wet air oxidation process over Al-Fe pillared clays synthesized using microwave irradiation

Halima Sassi^1,², Gwendoline Lafaye¹(

), Hédi Ben Amor², Abdelaziz Gannouni², Mohamed Razak Jeday², Jacques Barbier-Jr¹

¹. Institute of Chemistry of Poitiers, University of Poitiers, 86073 Poitiers Cedex 9, France
². Research Unit of Energy and Environment Gabes, National Engineering School of Gabes (ENIG), 6029 Zrig, Gabes, Tunisia

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Abstract

Tunisian clay has been successfully pillared with Al and Fe by microwave irradiation.

Microwave method reduces considerably the synthesis time and the water consumption.

AlFe-pillared clays are highly stable in the severe operating conditions of CWAO.

Oxidation takes place through a heterogeneous mechanism.

Microwave pillared-clays are good candidate for CWAO industrial water treatment.

Microwave irradiation has been used to prepare Al, Fe-pillared clays from a natural Tunisian smectite from the El Hicha deposit (province of Gabes). Chemical analysis, XRD spectra and surface properties evidenced the success of pillaring process. The obtained solids present higher surface area and pore volume than conventionally prepared Al-Fe pillared clays. The main advantages of the microwave methodology are the considerable reduction of the synthesis time and the consumption of water. The microwave-derived Al-Fe pillared clays have been tested for catalytic wet air oxidation (CWAO) of phenol in a stirred tank at 160°C and 20 bar of pure oxygen pressure. These materials are efficient for CWAO of phenol and are highly stable despite the severe operating conditions (acidic media, high pressure, high temperature). The catalyst deactivation was also significantly hindered when compared to conventionally prepared clays. Al-Fe pillared clays prepared by microwave methodology are promising as catalysts for CWAO industrial water treatment.

Keywords Water Catalytic wet air oxidation Pillared clays Microwave Phenol

Corresponding Author(s): Gwendoline Lafaye

Issue Date: 23 June 2017

Cite this article:

Halima Sassi,Gwendoline Lafaye,Hédi Ben Amor, et al. Wastewater treatment by catalytic wet air oxidation process over Al-Fe pillared clays synthesized using microwave irradiation[J]. Front. Environ. Sci. Eng., 2018, 12(1): 2.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-017-0971-1
https://academic.hep.com.cn/fese/EN/Y2018/V12/I1/2

Tab.1 Conditions for preparation of Al-Fe pillared clays

Tab.2 Aluminum and iron contents, basal spacing and specific surface area of the modified clay and of the calcined natural clay for comparison

Fig.1 X-ray diffraction patterns of the modified clay by microwave and conventional methods

Fig.2 (a) Phenol conversion and (b) abatement of total organic carbon (DTOC) over the calcined natural clay (X, continuous line) and over PIL catalysts prepared by a conventional method (empty marks, dotted lines) and by a microwave method (black marks, continuous lines)

Tab.3 Stability toward iron leaching under CWAO process of the modified clay and of the calcined natural clay for comparison

Tab.4 Phenol conversion and TOC abatement (DTOC) after 180 min of CWAO of phenol over fresh and reused PIL-AlFe20M and PIL-AlFe20 and the structural and textural properties of these catalysts

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