Treatment of hydroxy-naphthol blue, methylene blue, and trypan blue by electro Fenton process in aqueous solution with or without sparging air

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发表日期：

2024年4月29日

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Faiçal Gaied,
Boulbaba Louhichi,
Wissem Hamdi,
Nourredine Hamdi,
Boulbaba L’Taief,
Mohamed Razak Jeday

摘要

Abstract

The use of dyes in the textile industry poses significant environmental challenges, prompting a heightened focus on physical, chemical, and electrochemical processes for wastewater treatment. This research advocates for the remediation of methylene blue (MB), hydroxy naphthol blue (HNB), and trypan blue (TB) through the electro-Fenton (EF) procedure in aqueous media using iron anodes. To enhance the effectiveness of this technique, the integration of sparging air (SA) was introduced. In the EF process, the destruction of chemical oxygen demand (COD) for MB, TB, and HNB reached 89%, 89%, and 93%, respectively. With the incorporation of SA, the EF process further improved the degradation of COD for MB, TB, and HNB to 93%, 94%, and 97%, respectively. The specific electrical energy consumption (SEEC) reached 2.4, 0.8, and 1.99 kWh kg⁻¹ COD for the 89% reduction of MB and TB and 92% reduction of HNB can be achieved through EF + SA. These results underscore the significant potential of the proposed process in treating wastewater from the textile industry.

Highlights

In the EF process, COD destruction for MB, TB, and HNB reached 89%, 89%, and 93%, respectively.

With SA added, EF demonstrated improved COD degradation rates of 93%, 94%, and 97% for MB, TB, and HNB.

SEEC measured at 2.4, 0.8, and 1.99 kWh.kg-1 COD for reducing 89% of MB and TB and 92% of HNB through EF+SA.

These findings underscore the substantial capability of the suggested EF+SA process for efficiently addressing wastewater treatment in the textile industry.

Graphical abstract