Role of Cu x O-Anchored Pyrolyzed Hydrochars on H 2 O 2 -Activated Degradation of Tetracycline: Effects of Pyrolysis Temperature and pH

作者：Dun Fu, Tonni Agustiono Kurniawan, Herong Gui, Heng Li, Songbao Feng, Qingbiao Li, Yuanpeng Wang · 发表于：Industrial & Engineering Chemistry Research · 年份：2022 · DOI：10.1021/acs.iecr.2c01100 · 被引用次数：54 · 研究领域：Advanced oxidation water treatment、Advanced Photocatalysis Techniques、Environmental remediation with nanomaterials

This study investigated the effects of pyrolysis temperature on the physicochemical properties of pyrolyzed hydrochars (PHCs) and H 2 O 2 -catalyzed tetracycline (TC) degradation in a combined treatment with PHC and Cu x O@PHCs. The effects of pH on TC degradation by Cu x O@PHCs were also evaluated in the presence of H 2 O 2 and compared with that by Cu x O@GAC. To analyze their physicochemical changes due to the oxidant, the carbocatalysts were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) analysis, and Fourier transform infrared (FTIR) spectroscopy. To sustain its cost-effectiveness, spent Cu x O@PHC700 was regenerated using NaOH. Based on the characterization results, increasing the pyrolysis temperature from 300 to 700 °C enlarged their specific surface area and pore volume. The X-ray diffraction (XRD) analysis revealed that the Cu anchored in the carbocatalyst existed as Cu 2 O/CuO. The H 2 O 2 -catalyzed degradation by Cu x O@PHC700 (0.231 min –1 ) was faster than that by Cu x O@PHC500 (0.107 min –1 ), Cu x O@PHC300 (0.013 min –1 ), and Cu x O@GAC (0.041 min –1 ) ( p ≤ 0.05; analysis of variance (ANOVA)). The maximum TC removal was achieved by Cu x O@PHC700 at pH 6 due to the H-bonding and Cu-bridging effects between the Cu-loaded carbocatalyst and TC molecules in solutions. Treated effluents could meet the maximum discharge limit standard of 1 mg/L set by the local legislation. After the first regeneration...