The in situ synthesis method was used to grow Co-based one-dimensional MOF Co-PYDC (CP) on a pre-synthesized TiO2/TiOF2 (TOF) material which was used to treat tetracycline antibiotic wastewater. Through the degradation of tetracycline hydrochloride (TCH) under simulated sunlight, the photocatalytic activity of the synthesized samples was investigated. The results showed that the 5% CP/TOF photocatalyst exhibited the best photocatalytic performance on tetracycline hydrochloride degradation. The adsorption efficiency of TCH was 48% in the dark reaction for 0.5 h, and the removal efficiency reached 85% under 1.5 h simulated sunlight, which was much higher than those of TOF and CP monomers. Among them, the prepared 5% CP/TOF nanocomposite had a lower bandgap energy (2.63 eV), a larger specific surface area (52.01 m−2 g−1) and a lower electron–hole recombination rate. The synthesized CP/TOF photocatalyst showed promising application potential in antibiotic wastewater treatment. Moreover, the detected superoxide radical was the main active species, which further explained the degradation pathway and catalytic mechanism of the CP/TOF photocatalytic degradation of TCH, following the z-type heterojunction model. In this study, a CP/TOF composite material for photocatalytic degradation of tetracycline wastewater was designed and developed, which provided experimental methods and ideas for the practical treatment of wastewater.
Jiaxin Qu,Xueqian Wang,Langlang Wang,Bowen Xu,Ping Ning,Yixing Ma,Yibing Xie,Rui Cao,Qiang Ma
A nonmetallic N-doped Zr/Ti-based catalyst was prepared to investigate the effect of N addition on catalytic performance for carbon disulfide (CS 2 ) hydrolysis. The characterization of the catalyst indicated that doped N atoms were present as interstitial N in the TiO 2 lattice, resulting in an increase in the number of basic sites of the catalyst from 1.64 to 2.37 and from 0.68 to 2.53 for weakly basic and strongly basic sites, respectively. In addition, the doping of N promoted the formation of OH groups, which were favorable for the hydrolysis of CS 2 , from water (H 2 O) adsorbed on the catalyst, thus greatly improving the performance of catalytic CS 2 hydrolysis. However, N doping reduced the amount of chemisorbed oxygen on the catalyst surface from 44.7% to 33.4%, thus decreasing the oxidation reaction of the hydrolysis product H 2 S and improving the stability of the catalyst. CS 2 hydrolysis reaction activity and catalyst lifetime were tested. The experimental results demonstrated that the catalytic CS 2 hydrolysis performance was greatly improved after N doping, and the temperature to obtain 100% conversion was reduced from 180 °C to 130 °C. Selectivity to H 2 S was greatly improved with N-doped catalysts. Furthermore, the resistance of the catalyst to sulfate was improved. Nonmetallic N-doped Zr/Ti-based catalysts offer a new strategy for blast furnace gas desulfurization.
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