Photocatalytic behavior of biochar-modified carbon nitride with enriched visible-light reactivity.

Abstract:

:Ultra-thin layered structures and modified bandgaps are two efficient strategies to increase the photocatalytic performance of various materials for the semiconductor industry. In the present study, we combined both strategies in one material to form carbon-doped graphitic carbon nitride (g-C3N4) nano-layered structures by the method of melamine thermal condensation, in the presence of different mass ratios of biochar. The characterization showed that the composite with the best ratio retained the g-C3N4 polymeric framework and the bond with g-C3N4. The biochar was established via π-π stacking interactions and ether bond bridges. The π-conjugated electron systems provided from biochar can elevate charge separation efficiency. The ultra-thin structure also curtailed the distance of photogenerated electrons migrating to the surface and enlarge specific surface area of materials. The presence of carbon narrowed the bandgap and increased light absorption at a wider range of wavelengths of g-C3N4. The biochar/melamine ratio of 1:15 presented the best performance, 2.8 and 5 times faster than g-C3N4 degradating Rhodamine and Methyl Orange, respectively. Moreover, the catalyst presented a good stability for 4 cycles. In addition to that, biochar from waste biomass can be considered a sustainable, cost-effective, and efficient option to modify g-C3N4-based photocatalysts.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Meng L,Yin W,Wang S,Wu X,Hou J,Yin W,Feng K,Ok YS,Wang X

doi

10.1016/j.chemosphere.2019.124713

subject

Has Abstract

pub_date

2020-01-01 00:00:00

pages

124713

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(19)31943-5

journal_volume

239

pub_type

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