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Among reported systems, polymeric carbon nitride (PCN) has demonstrated exceptional selectivity toward value\u2010added aldehydes, including formaldehyde, acetaldehyde, glyceraldehyde, and benzaldehyde. This work reviews recent progress in PCN\u2010based photocatalysts for upgrading methanol, ethanol, glycerol, and benzyl alcohol, with emphasis on modification strategies, including catalyst design and engineering that promote charge separation and surface reactivity, often achieving near\u2010quantitative selectivity. Despite these advances, low product yields remain a challenge, limited by sluggish carrier dynamics, narrow light absorption, and surface kinetics. 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