Efficient removal of herbicide 2,4-dichlorophenoxyacetic acid from water using Ag/reduced graphene oxide co-decorated TiO2 nanotube arrays

► The photocatalysts exhibit strong response to visible light. ► The ternary photocatalyst shows effective separation of photogenerated charges. ► The photocatalyst displays almost 100% photocatalytic removal of 2,4-D. ► The photocatalyst is easily recovered with excellent cycling stability.