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Zhu, Gangqiang,Hojamberdiev, Mirabbos,Zhang, Shaolin,Din, Syed Taj Ud,Yang, Woochul Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.467 No.-
<P><B>Abstract</B></P> <P>In order to further improve its photocatalytic activity, the BiOI microspheres were activated by a synchronous coupling of Bi metal and graphene under solvothermal conditions. The effects of the synthesis temperature (160–200 °C) on crystallinity, morphology, and photocatalytic activity were studied in particular. As expected, the ternary Bi-BiOI/graphene photocatalyst synthesized at 180 °C exhibited higher photocatalytic activity for NO oxidation removal under visible light irradiation than individual BiOI, and binary Bi-BiOI and BiOI/graphene composites. The photocatalytic efficiency for the NO removal of the ternary Bi-BiOI/graphene photocatalyst synthesized at 180 °C reached 51.8% within 30 min of visible light irradiation. The enhanced photocatalytic activity of the ternary Bi-BiOI/graphene photocatalyst is attributed to (I) the efficient transfer of photo-generated electrons from BiOI and Bi to graphene, leading to the effective separation of the photo-generated electron-hole pairs and (II) the surface plasmon resonance effect of Bi nanoparticles in the composite photocatalyst. Furthermore, the results of the scavenger experiments and DMPO-ESR spin-trapping measurements reveal that O<SUB>2</SUB> <SUP>−</SUP> radical species play the most critical role and holes serve as a secondary active species in the oxidative removal process of NO by 180BOI/GR composite under visible light irradiation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ternary Bi-BiOI/graphene photocatalyst was synthesized by solvothermal method. </LI> <LI> The composite photocatalyst can harness from visible to NIR spectrum. </LI> <LI> Bi-BiOI/graphene shows efficient photocatalytic activity for NO oxidation removal. </LI> <LI> O<SUB>2</SUB> <SUP>–</SUP> radical species play the most critical role in the photocatalytic process. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Shahlo S. Daminova,Zukhra C. Kadirova,Khasan T. Sharipov,Olga V. Stoyko,Stanislav A. Chepulsky,Adewale Adewuyi,Mirabbos Hojamberdiev 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.55 No.-
The extraction and sorption of copper from wastewaters can be improved by applying solvent- impregnated resins (SIRs) with chelating organic extractant. The SIRs are capable of increasing the sorption capacity of expensive ion-exchange resin in order to enhance the performance of traditional liquid–liquid extraction by organic solvents thus reducing copper pollution in water. In this present study, macroporous non-ionogenic styrene-divinylbenzene polymeric sorbent (Porolas) matrix was impregnated with diisopropyldithiophosphoric acid (DIPDTP) to enhance Cu2+ sorption in aqueous system. The influence of pore-filling degree (0–100%) by DIPDTP on copper sorption from aqueous chloride solution (pH = 1.95–10.7) was also evaluated. Higher degree of pore-filling by DIPDTP led to a significant decrease of the specific surface area (SBET) of the DIPDTP-Porolas sorbents, confirming an effective impregnation. The Cu2+ adsorption isotherm fitted well for Freundlich isotherm, and the maximum KF (8.45 g L1) was obtained for 50% DIPDTP-Porolas with 97–99% Cu2+ uptake due to the formation of Cu2+–complexes, CuCltL2-t(HL)q. The Cu2+ adsorption kinetic followed pseudo-second-order kinetic model at pH = 4–5 while the Lemna minor ecotoxicity test revealed absence of toxic secondary pollution of wastewater. The DIPDTP-impregnated Porolas was found to be an efficient sorbent for simple, safe, and environment-friendly extraction of Cu2+ from industrial wastewaters using small amount of organic solvent.