Composition-dependent dual halide anion-doped bismuth terephthalate hybrids for enhanced pollutants removal

Six dual halide anions made from the combinations of NaF, NaCI, NaBr and Nal, each with 0.25 equiv relative to the molar of Bi(NO3)(3), were doped into bismuth terephthalate by a one-pot synthesis method. The hybrid doped by NaF and Nal shows excellent adsorption and significantly enhanced visible-light degradation of rhodamine B. The photodegradation efficiency of this dual halides doped hybrid is approximately 2.2-10 times enhancement in compared to those of similarly single halide doped hybrids. The higher photodegradation activity was attributed to its composition, a regularly lamellar morphology, higher surface-to-volume ratio and an extended light absorption edge. Moreover, O-2, OH and h+ are found to be important active species involved in photodegradation process. The dual halide anions doped bismuth terephthalate hybrids reported in the present work are promising visible-light catalysts for organic pollutants removal. (C) 2016 Elsevier Inc. All rights reserved.