The textile industry contributes to dye waste, one of which is methylene blue. Methylene blue is a cationic base dye with a heterocyclic structure with the chemical formula C16H18N3SCl. It is toxic and difficult to degrade naturally. Therefore, a photodegradation method is needed to reduce this dye. In this study, a composite material based on areca nut (Areca catechu L.) peel hydrochar impregn…