Bisphenol A removal on TiO₂-MoS₂-reduced graphene oxide composite by adsorption and photocatalysis

Bisphenol A (BPA) is a well-known, representative endocrine disruptor chemical, which can cause adverse effects on human health and environment. In this work, we prepared TiO 2 -MoS 2 -reduced graphene oxide (denoted as TiO 2 -MoS 2 -RGO) ternary hybrid photocatalyst to remove it by adsorption and photocatalysis. The prepared photocatalyst were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD). The mass ratio of MoS 2 in the composite was optimized. The results indicated that the anatase TiO 2 and MoS 2 were anchored on the reduced graphene oxide, and the optimum mass ratio of MoS 2 in TiO 2 -MoS 2 -reduced graphene oxide was 1.0% (denoted as TiO 2 -1MoS 2 -RGO). Under the same photocatalytic degradation condition, BPA adsorption removal ratios over TiO 2 , P25, TiO 2 -1MoS 2 , TiO 2 -RGO and TiO 2 -1MoS 2 -RGO were 0.75%, 0.79%, 2.30%, 24.00% and 22.10%, photocatalytic degradation removal ratios were 17.20%, 19.90%,27.33%, 26.30% and 40.30% and the total removal ratios were 17.95%, 21.69%, 29.66%, 50.30% and 62.40%, respectively. The results indicated that TiO 2 -1MoS 2 -RGO exhibited highest adsorption and photocatalytic degradation activity among them and the introduction of MoS 2 in the TiO 2 -RGO can reduce the electron-hole pair combination and enhance photocatalytic activity of TiO 2 for BPA greatly.