Effect of Silica on the Ultrasonic/Persulfate Process for Degradation of Acid Black 1 in Aqueous Solutions

Abstract

Azo dyes are the greatest classes of synthetic dyes, which are widely used in the textile industries. This study aimed at examining Acid Black 1 (AB1) removal from aqueous solution thermal activated persulfate using silica (SiO2). The effects of operational parameters such as initial pH, initial concentration of AB1, SiO2 dosage, and persulfate concentration were investigated and the chemical oxygen demand content was considered as a response. The results indicated that the removal efficiency had a direct relationship with concentration of SiO2 and persulfate up to their optimum values, and was inversely correlated with the alkaline pH and elevated concentrations of AB1. Moreover, the removal efficiency was increased significantly by increasing the silica concentration from 25 mg/L to 100 mg/L. Ultimately, AB1 was completely removed after 45 minutes.

Convenient pH-responsive removal of Acid Black 1 by green l-histidine/iron oxide magnetic nanoadsorbent from water: performance and mechanistic studies

“…7 Certain azo dyes may release carcinogenic aromatic amines and mutagenic end products. 8 They may cause skin allergy and affect the respiratory, reproductive and digestive systems of animals and humans. 9 The color in water also reduces sunlight penetration and dissolved oxygen, posing a considerable threat to the aquatic biota.…”

Application of a Moving Bed Biofilm Reactor in Removal of Ciprofloxacin From Real Hospital Effluent: Effect of Operational Conditions

“…The presence of pharmaceuticals, particularly antibiotics, in aquatic environments has been a growing concern over the past decade (1). These compounds, which are special group of micropollutants, cause environmental contamination through waste disposal of industries as point sources for example and agricultural runoff as non-point sources (2).…”