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

Journal of hazardous materials (2012-10-16)
Yanhong Tang, Shenglian Luo, Yarong Teng, Chengbin Liu, Xiangli Xu, Xilin Zhang, Liang Chen
ABSTRACT

A new photocatalyst, Ag nanoparticles (NPs) and reduced graphene oxide (RGO) co-decorated TiO(2) nanotube arrays (NTs) (Ag/RGO-TiO(2) NTs), was designed and facilely produced by combining electrodeposition and photoreduction processes. The structures and properties of the photocatalysts were characterized. The ternary catalyst exhibited almost 100% photocatalytic removal efficiency of typical herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) from water under simulated solar light irradiation. The photodegradation rate toward 2,4-D over Ag/RGO-TiO(2) NTs is 11.3 times that over bare TiO(2) NTs. After 10 successive cycles with 1600 min of irradiation, Ag/RGO-TiO(2) NTs maintained as high 2,4-D removal efficiency as 97.3% with excellent stability and easy recovery, which justifies the photocatalytic system a promising application for herbicide removal from water.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
2,4-Dichlorophenoxyacetic acid, ≥95%, crystalline
Supelco
2,4-D, PESTANAL®, analytical standard
Sigma-Aldrich
2,4-Dichlorophenoxyacetic acid, 97%
Supelco
2,4-D, certified reference material, TraceCERT®
Supelco
2,4-D, PESTANAL®, analytical standard
Supelco
2,4-D solution, certified reference material, 5000 μg/mL in acetonitrile