In this work, we reported a novel green chemistry method for the synthesis of novel Pd NPs-PTH-CNTs hybrid material. Effect of PTH on the size and dispersion degree of Pd NPs was investigated and correlated with composite catalytic activity in the ORR and amaranth electro-photodegradation. The catalytic activity of Pd NPs-PTH-CNTs material is compared with control materials Pd NPs-PTH and Pd NPs-CNTs. PTH incorporation as reducing agent in the deposition of Pd NPs over CNTs promoted the control of particle size and improved their dispersion over the whole CNT surface; also, increase 50% more ORR catalytic activity in the production of H2O2 with the decrease of Pd particle size. This improvement allowed to remove 95% of amaranth with a lower current consumption in the electro-photodegradation. It should be highlighted the green chemistry approach through the synthesis of nanocomposites by ecofriendly methods in one step. (C) 2018 Elsevier Ltd. All rights reserved.