Abstract
Pyridine is a toxic component in industrial wastewater, which is difficult to remove using conventional methods. In this study, the cost-effective coke powder was used to remove pyridine from a pyridine simulation wastewater. The removal efficiency and adsorption capacity of pyridine reached up to 67.32% and 0.4488 mg/g, respectively, at a coke powder concentration of 60 mg/L and an adsorption time of 30 min. The pyridine removal efficiency and adsorption capacity of coke powder reached saturation when the initial concentration was 40 mg/L. The pH of 2–12 in the solution was found to have little effect on the pyridine adsorption process of coke powder, while the coke powder with lower ash content was of better adsorbability for pyridine. The coke powder was regenerated by heat treatment, and reused for pyridine adsorption. It was found that the pyridine removal efficiency slightly decreased after nine times of reuse, in addition to a small cumulative weight loss rate of coke powder. Adsorption isotherm analysis showed that the adsorption of pyridine by coke powder could be well described by the Freundlich isothermal adsorption model, indicating multi-molecular layers mainly dominated the adsorption of pyridine on the surface of coke powder.
Highlights
Pyridine is often used as a chemical raw material in industry
Pyridine and its derivatives have been widely used in agriculture as agricultural pesticides and herbicides, and enter the environment through industrial activities related to pharmaceuticals, textile manufacturing, and chemical synthesis
The properties of the coke powder used for this study were analyzed using the XRF and XRD, and the results are shown in Table 2 and Figure 1
Summary
Pyridine is often used as a chemical raw material in industry. It mainly comes from coal tar and coal gasification [1]. The removal rate of pyridine reached up to 65% without adjusting acidity and alkalinity at a treatment time of 60 min and a coking coal concentration of 30 g/L. The results showed that coke powder could effectively adsorb fluoride with the adsorption capacity of 20 mg/g and a removal rate of fluoride of 66.7% at the optimum condition (temperature of 289 K, oscillator speed of 150 r/min, pH of 5, treatment time of 120 min, the coke powder concentration of 10 g/L, and the fluoride concentration of 60 mg/L). This paper studies the treatment of pyridine-containing wastewater using coke powder It was investigated the effect of coke powder concentration, contact time, initial pyridine concentration, ash content in coke powder, solution pH, and the reuse of coke powder after adsorption on the pyridine removal.
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