Ozone catalytic oxidation capacity of Ti‐Co@Al₂O₃ for the treatment of biochemical tailwater from the coal chemical industry

Abstract

A Ti‐Co@γ‐Al2O3 composite catalyst was prepared using impregnation and sol‐gel methods to degrade biochemical tailwater from the coal chemical industry, and its preparation conditions (active component doping ratio, load times, and calcination temperature) were optimized through single‐factor experiments. The surface properties of the Ti‐Co@γ‐Al2O3 composite catalyst and the crystal structure characteristics of the catalytically active components were characterized via scanning electron microscopy–energy dispersive spectrometry, X‐ray diffraction, and X‐ray fluorescence. The effects of reaction time, initial pH, ozone aeration, and catalyst dosage on degradation performance were investigated through an experiment on the catalytic ozonation degradation of biochemical tail water. Results showed that the optimal conditions were as follows: reaction time of 30 min, pH of 8.2, ozone aeration of 30 mg/min, and catalyst dosage of 20 g/L. The total phenol and total organic carbon removal rates for biochemical tailwater were 66.1% and 57.6%, respectively, in the catalytic system. The mechanism of degradation of organic pollutants by catalytic ozonation was investigated by adding tert‐butanol to the catalytic ozone oxidation system. The degradation of chemical oxygen demand in biochemical tailwater was caused primarily by the synergy between the Ti‐Co@γ‐Al2O3 catalyst and ozone. Practitioner points Ti‐Co/γ‐Al2O3 catalyst was prepared for the catalytic oxidation of biochemical tail water. The optimal removal rates of total phenol and TOC were 67.7% and 58.8%, respectively. The organic matter was degraded rapidly and efficiently after 5 min of ozone catalytic oxidation reaction. It provides theoretical guidance for the practical application of ozone catalytic oxidation.

Evaluation of fluoride adsorption in solution by synthetic Al2O3/CeO2: A fixed‐bed column study

“…According to the XRD analysis (Figure 1a), there are three main diffraction peaks of the Al 2 O 3 at 2θ = 36.8°, 46.1°, and 66.8°, respectively, which match with the crystal phase of γ‐Al 2 O 3 (Sun et al, 2020). The intensity of the three main peaks decreased obviously on the modified sample, indicating that the cerium oxide was well dispersed on the surface of the Al 2 O 3 after impregnation and roasting.…”

Research Progress of Iron-Based Catalysts in Ozonation Wastewater Treatment

“…Due to the full gas–liquid–solid three-phase contact, the volume mass transfer coefficient is increased, and the rate of ozone decomposition in the system to produce hydroxyl radicals is accelerated. However, when the amount of ozone is excessive, the three-phase equilibrium is broken, and the residence time of ozone in water is correspondingly increased, which reduces the utilization rate of ozone and reduces the production efficiency . As a result, there are several factors to think about when investigating ozone dose.…”

“…However, when the amount of ozone is excessive, the three-phase equilibrium is broken, and the residence time of ozone in water is correspondingly increased, which reduces the utilization rate of ozone and reduces the production efficiency. 97 As a result, there are several factors to think about when investigating ozone dose. First, the catalytic ozone reaction that breaks down wastewater involves multiple phases, including solid, liquid, and even gaseous ones.…”

Oxygen Reduction Reaction in the Field of Water Environment for Application of Nanomaterials

“…Not only can it efficiently catalyze the generation of hydroxyl radicals, but it can also reduce the risk of secondary pollution and is very popular as a catalytic material that is convenient for recycling. The Ti-Co @γ-Al 2 O 3 compound catalyst prepared by Wenquan Sun et al [63] used impregnation and soluble-gel to degrade biochemical tailings from the coal chemical industry and achieved impressive results. When biochemical tailings were used to catalyze ozone oxidation degradation experiments, the results show that the best conditions for degradation performance were: reaction time is 30 min, pH is 8.2. ozone flux is 30 mg/min, and catalyst usage is 20 g/L.…”

“…In this section, some issues worth exploring are highlighted and a future direction on nanocatalysts is also provided. The problem of water environment pollution and the development and utilization of water resources have important guiding significance [ 17 , 63 ]. The flow of nanomaterials into the environment may have a profound impact on living things.…”