Effect of nonmetals (B, O, P, and S) doped with porous g-C3N4 for improved electron transfer towards photocatalytic CO2 reduction with water into CH4
Effect of nonmetals (B, O, P, and S) doped with porous g-C3N4 for improved electron transfer towards photocatalytic CO2 reduction with water into CH4
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DOI：
10.1016/j.chemosphere.2021.131765
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发表时间：
2021-08-06
期刊：
影响因子：
8.8
通讯作者：
Praserthdam, Piyasan
中科院分区：
文献类型：
--
作者：
Arumugam, Malathi;Tahir, Muhammad;Praserthdam, Piyasan
将二氧化碳（CO2）光催化转化为气态烃燃料是除了减少温室气体排放之外生产可再生燃料的有利方式。本工作采用尿素固相缩聚法制备了非金属（B、O、P和S）掺杂的石墨碳氮化物（g-C3 N4），并在紫外光照射下将其用于光催化CO2还原为急需的甲烷（CH 4）。各种物理化学表征结果揭示了B、O、P和S元素在gC 3 N4基质中的成功掺入。照射7小时后，S掺杂g-C3 N4还原CO2的最大CH 4产率为55.10 nmol/（mLH2O.gcat）。该甲烷产量比B、O、P和裸g-C3 N4样品高1.9、1.4、1.7和2.4倍。S的掺杂并没有增加g-C3 N4样品的比表面积和光子吸收能力，但这种显著的改善显然是由于有效的电荷分离和迁移。观察到的结果表明，非金属元素的掺杂提供了改善的电荷分离，是提高光催化剂性能的有效途径。本工作为设计用于可再生燃料生产的非金属掺杂g-C3 N4光催化剂提供了一种吉祥的方法，并有望用于其他能源应用。
Photocatalytic conversion of carbon dioxide (CO2) into gaseous hydrocarbon fuels is an auspicious way to produce renewable fuels in addition to greenhouse gas emission mitigation. In this work, non-metals (B, O, P, and S) doped graphitic carbon nitride (g-C3N4) was prepared via solid-state polycondensation of urea for photocatalytic CO2 reduction into highly needed methane (CH4) with water under UV light irradiation. The various physicochemical characterization results reveal the successful incorporation of B, O, P, and S elements in the gC3N4 matrix. The maximum CH4 yield of 55.10 nmol/(mLH2O.gcat) over S-doped g-C3N4 has been obtained for CO2 reduction after 7 h of irradiation. This amount of CH4 production was 1.9, 1.4, 1.7, and 2.4-folds higher than B, O, P and bare g-C3N4 samples. The doping of S did not enlarge the surface area and photon absorption ability of the g-C3N4 sample, but this significant improvement was evidently due to effective charge separation and migration. The observed results imply that the doping of non-metal elements provides improved charge separation and is an effective way to boost photocatalyst performance. This work offers an auspicious approach to design non-metal doped g-C3N4 photocatalysts for renewable fuel production and would be promising for other energy application.