Removal of ammonia nitrogen in aquaculture wastewater by composite photocatalyst TiO₂/carbon fibre

Abstract

In this study, TiO2/Carbon fibre (CF) composite photocatalyst was prepared by sol‐gel method, and its characterization was analysed by SEM and XRD. Under the ultraviolet light, the effects of various single factors on the removal of ammonia nitrogen from aquaculture wastewater by TiO2/CF were discussed. Orthogonal experiments were performed to determine the most beneficial conditions for ammonia nitrogen removal. When the dosage of TiO2/CF was 2.0 g/L, the initial concentration of ammonia nitrogen was 30 mg/L, the calcination temperature was 600°C, the concentration of H2O2was 0.8 g/L, the illumination time was 1 hr, TiO2/CF had excellent performance of remove ammonia nitrogen. The results show that compared with the treatment of ammonia nitrogen by CF or TiO2, TiO2/CF was more effective in the removal of ammonia nitrogen. TiO2/CF composite material was applied to the treatment of ammonia nitrogen in marine aquaculture wastewater for the first time, which provides a scientific and effective treatment method for photocatalytic technology in later industrial treatment process.

Integrated Hydrogen Peroxide, Sono, and Heterogeneous Photocatalysis Technologies: A Novel Technique for Ammonia and Phosphorus Removal in Real Poultry Slaughterhouse Wastewater

“…When the pH is increased to 10, the concentration of ammonium ions and the decomposition of ammonia by radical oxidation both decrease. US improve the removal efficiency of free volatile ammonia as the pH increases (Yu et al, 2021). Wang et al (2008) and Xu et al (2005) declared that the optimal pH range for ammonia-N removal was between 8 and 11.…”

“…Therefore, it is likely that the surface of the photocatalyst underwent a significant ammonium coating, especially in the early stages of the process when ammonium ions were abundant and radical oxidation was expected to occur. This coating may hinder the excitation of photogenerated electronhole pairs and the subsequent generation of • OH and • O 2 -, thereby diminishing the efficiency of ammonium nitrogen removal (Wang et al, 2008;Yu et al, 2021).…”

Methods for the Detection and Remediation of Ammonia from Aquaculture Effluent: A Review

“…88.64% removal efficiency was achieved using 0.5g/L chitin/ZnO(2:3) photocatalyst at irradiation time of 2 h and 500 • C calcinations temperature. Yu et al [87] synthesized and treated ammonia with TiO 2 /carbonfibre (CF) nanocomposite, TiO 2 and carbon fibre photocatalysts from aquaculture wastewater. Parameters such as dosage, calcination temperature of the adsorbent, etc, were studied.…”

Photocatalytic performance of biochar-modified TiO2(C/TiO2) for ammonia–nitrogen removal

“…10 Specically, TiO 2 has notable advantages, including stable chemical properties, high photocatalytic activity, nontoxicity, strong oxidizing ability, and low cost. 11,12 It is the most used conventional photocatalyst and has shown good achievements in treating NH 3 -N pollutants in water. 7 There are some research reports conrming that NH 3 -N can be removed efficiently by TiO 2 photocatalysts from aqueous solutions.…”