TY - JOUR

T1 - Photomineralization of recalcitrant wastewaters by a novel magnetically recyclable boron doped-TiO2-SiO2 cobalt ferrite nanocomposite as a visible-driven heterogeneous photocatalyst

AU - Zangeneh, H.

AU - Zinatizadeh, A.A.

AU - Feyzi, M.

AU - Zinadini, S.

AU - Bahnemann, D.W.

N1 - Funding information: The authors would like to thank Kermanshah’s Municipal Water and Wastewater Company (Grant no.: 14579/94/129 ) for their full financial support. The authors also thank the Razi University Research Council for support of this work.

PY - 2018/10

Y1 - 2018/10

N2 - In this work, different recalcitrant organic compounds including biologically treated palm oil mill effluent (POME), diazinon and paraquat dichloride and natural dye from algal growth in Solaymanshah's dam was degraded using a novel highly efficient magnetically visible driven photocatalyst (boron doped TiO 2-SiO 2 cobalt ferrite) which was synthesized by a sol gel hydrothermal method. The prepared nanocomposites were characterized by UV-vis diffuse reflectance (DRS) spectroscopy, X-ray diffraction (XRD), photoluminescence (PL), Fourier transform infrared (FT-IR), field emission scanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM) analyses. The results revealed that boron doped-TiO 2-SiO 2 cobalt ferrite nanocomposite not only expanded the response region to the visible light but also reduced recombination of the photoinduced e -/h + pairs. The effects of various parameters, such as COD concentrations (300-800 mg/l), photocatalyst concentration (1.5-3.5 g/l) and pH (3-11) on the photocatalytic process were also evaluated. The COD contents was completely removed for the biologically treated POME, paraquat dichloride, diazinon, natural dye from algal growth in Solaymanshah dam's after 4/5, 3/5, 3 and 2/5 h, respectively at optimum conditions (initial COD concentration of 300 mg/l, catalyst loading 2/5 g/l and pH of 3). Furthermore, the magnetic nanocomposite can be easily recovered and separated with an extra magnet with a small loss of 0.01-0.05 g/l corresponding to 0.4-2 %. After being reused for three times, the reduction of COD removal efficiency of the natural dyes, diazinon, paraquat dichloride and biologically treated POME was about 1, 1, 3 and 4%, respectively that confirmed the photocatalytic stability of nanocomposite.

AB - In this work, different recalcitrant organic compounds including biologically treated palm oil mill effluent (POME), diazinon and paraquat dichloride and natural dye from algal growth in Solaymanshah's dam was degraded using a novel highly efficient magnetically visible driven photocatalyst (boron doped TiO 2-SiO 2 cobalt ferrite) which was synthesized by a sol gel hydrothermal method. The prepared nanocomposites were characterized by UV-vis diffuse reflectance (DRS) spectroscopy, X-ray diffraction (XRD), photoluminescence (PL), Fourier transform infrared (FT-IR), field emission scanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM) analyses. The results revealed that boron doped-TiO 2-SiO 2 cobalt ferrite nanocomposite not only expanded the response region to the visible light but also reduced recombination of the photoinduced e -/h + pairs. The effects of various parameters, such as COD concentrations (300-800 mg/l), photocatalyst concentration (1.5-3.5 g/l) and pH (3-11) on the photocatalytic process were also evaluated. The COD contents was completely removed for the biologically treated POME, paraquat dichloride, diazinon, natural dye from algal growth in Solaymanshah dam's after 4/5, 3/5, 3 and 2/5 h, respectively at optimum conditions (initial COD concentration of 300 mg/l, catalyst loading 2/5 g/l and pH of 3). Furthermore, the magnetic nanocomposite can be easily recovered and separated with an extra magnet with a small loss of 0.01-0.05 g/l corresponding to 0.4-2 %. After being reused for three times, the reduction of COD removal efficiency of the natural dyes, diazinon, paraquat dichloride and biologically treated POME was about 1, 1, 3 and 4%, respectively that confirmed the photocatalytic stability of nanocomposite.

KW - Magnetic CoFe O nanoparticles

KW - Recalcitrant compounds

KW - Separable visible driven photocatalyst

KW - Wastewater treatment under sun light

UR - http://www.scopus.com/inward/record.url?scp=85054767135&partnerID=8YFLogxK

U2 - 10.1016/j.jece.2018.10.001

DO - 10.1016/j.jece.2018.10.001

M3 - Article

VL - 6

SP - 6370

EP - 6381

JO - Journal of Environmental Chemical Engineering

JF - Journal of Environmental Chemical Engineering

IS - 5

ER -