Xunxun Li,Yaru Wang,Dongyun Chen,Jun Xiao,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Oxygen vacancies have been verified to be an important factor in the catalytic oxidation of VOCs. Herein, we report that surface-modified Co/Ce hexagonal nanosheets have excellent catalytic activity, stability, and water resistance. The introduction of cerium increases the oxygen storage capacity of the catalyst. In this work, the best catalyst (1.00 wt % Pd Co/Ce = 4/1) showed the highest catalytic activity for VOC oxidation (T90(toluene) = 160 °C, T90(benzene) = 156 °C). Combining XPS and O2-TPD data, it has been demonstrated that the introduction of cerium increases the adsorbed oxygen concentration of the catalyst. The oxidation of toluene and benzene over the 1.00 wt % Pd Co/Ce = 4/1 catalyst obeys the Langmuir–Hinshelwood (L–H) mechanism.
Mingge Wu,Qianqian Li,Cheng Chen,Guijin Su,Maoyong Song,Bohua Sun,Jing Meng,Bin Shi
The high-efficiency photocatalytic debromination of hexabromocyclododecane (HBCD) as new POPs and discovery of involved mechanisms remain a challenge. Herein, challenging Pd-anchored hollow-rod-like-g-C 3 N 4 (Pd/HR-g-C 3 N 4 ) was constructed as visible-light-driven photocatalyst. Complete destruction of (±)-α, (±)-β and (±)-γ-HBCD with 92.6 % bromine-removal was achieved at 60 min in optimal system of anaerobic methanol-water (70:30) mixture with 0.5 % Pd/HR-g-C 3 N 4 , being superior to most studied HBCD catalytic systems. The higher photocatalytic reduction performance is contributed to enhanced photoexcited-carriers separation and more negative conduction band arising from distinctive 1D-cavity of HR-g-C 3 N 4 , and surface-atomically dispersed Pd. A never-reported degradation pathway in which hydrodebromination and addition ring-opening synergistically occur is proposed according to identified products of ten saturated chain alkanes, C 12 H 19 Br 5 and C 12 H 19 Br 7 . Ulteriorly, hydride-transfer resulted in rapid hydrodebromination of HBCD over Pd/HR-g-C 3 N 4 , where H chiefly derives from methanol instead of water although they synergistically promoted e − utilization. This provided a valuable sight into the cost-effective pollution-removal of HBCD.
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