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.
In this study, the adsorption of the antibiotic compound tetracycline (TC) from aquaculture wastewater was investigated using lanthanum-modified carbon nanotubes (La-CNTs) prepared by impregnation method. The composition and morphology of La-CNTs were characterized by EDS, XRD, and BET analysis. Single-factor experiments were performed to investigate their effect on the adsorption of TC by La-CNTs. The adsorption kinetics and adsorption isotherms indicated that the pseudo-second-order kinetic model and Langmuir adsorption isotherm equation adequately described the adsorption behavior of La-CNTs. Moreover, the maximum adsorption capacity (Q m ) was 93.46 mg/g. The thermodynamics studies indicated that adsorption of TC by La-CNTs were endothermic and spontaneous respectively.Further, the adsorption force of La-CNTs on TC could be attributed to van der Waals force, π-π adsorbate-adsorbent interaction and electrostatic interaction. Based on these experimental results, this novel composite material shows good potential application value for the removal of TC from aquaculture wastewater.
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