Abstract Exploration of efficient and stable photocatalysts to mimic natural leaves for the conversion of atmospheric CO 2 into hydrocarbons utilizing solar light is very important but remains a major challenge. Herein, we report the design of four novel metal–salen‐incorporated conjugated microporous polymers as robust artificial leaves for photoreduction of atmospheric CO 2 with gaseous water. Owing to the rich nitrogen and oxygen moieties in the polymeric frameworks, they show a maximum CO 2 adsorption capacity of 46.1 cm 3 g −1 and adsorption selectivity for CO 2 /N 2 of up to 82 at 273 K. Under air atmosphere and simulated solar light (100 mW cm −2 ), TEPT‐Zn shows an excellent CO yield of 304.96 μmol h −1 g −1 with a selectivity of approximately 100%, which represents one of the best results in terms of organic photocatalysts for gas‐phase CO 2 photoreduction so far. Furthermore, only small degradation in the CO yield is observed even after 120‐h continuous illumination. More importantly, a good CO yield of 152.52 μmol g −1 was achieved by directly exposing the photocatalytic reaction of TEPT‐Zn in an outdoor environment for 3 h (25–28°C, 52.3 ± 7.9 mW cm −2 ). This work provides an avenue for the continued development of advanced polymers toward gas‐phase photoconversion of CO 2 from air.
Abstract The great demand for visible‐light‐induced catalysts with high photocatalytic performance has stimulated extensive interest in constructing g‐C 3 N 4 ‐based Z‐Scheme heterojunctions. In this research work, the g‐C 3 N 4 /Bi 2 O 3 Z‐Scheme heterojunction by precipitation‐hydrothermal method was constructed, and characterized by various techniques. The g‐C 3 N 4 /Bi 2 O 3 ‐1 composite exhibited a transient photocurrent response approximately 7 and 5 times higher than that of bare g‐C 3 N 4 and Bi 2 O 3 , respectively, and showed higher visible photocatalytic activity with 99.8 % degradation of methylene blue (MB) within 75 min. Meanwhile, the pH effect on the photocatalytic degradation of MB was investigated. Radicals trapping experiments showed that •OH free radical played a predominant role for the degradation of MB, EPR analysis confirmed the presence of superoxide radicals, which combined with the band structure of the composites, confirmed the Z‐Scheme of the heterojunction. A possible mechanism for photocatalytic degradation of MB dyes in g‐C 3 N 4 /Bi 2 O 3 ‐1 composites was also proposed. This study provided a new avenue for the development of novel g‐C 3 N 4 ‐based Z‐Scheme heterojunction materials with prospective applications in the fields of energy and environment.
'/%3e%3cuse xlink:href='%23a' transform='rotate(23.036 .093 25.536)'/%3e%3cuse xlink:href='%23a' transform='rotate(45.87 1.273 16.18)'/%3e%3cuse xlink:href='%23a' transform='rotate(69.945 .996 12.078)'/%3e%3cuse xlink:href='%23a' transform='rotate(20.66 -19.689 31.932)'/%3e%3c/svg%3e)
'/%3e%3cuse xlink:href='%23a' transform='rotate(144 450 300)'/%3e%3cuse xlink:href='%23a' transform='rotate(216 450 300)'/%3e%3cuse xlink:href='%23a' transform='rotate(288 450 300)'/%3e%3c/svg%3e)
'/%3e%3cuse xlink:href='%23a' transform='translate(288.889 -214.211)'/%3e%3cuse xlink:href='%23a' transform='translate(108 342.749)'/%3e%3cuse xlink:href='%23a' transform='translate(469.189 342.749)'/%3e%3c/svg%3e)