References
  -  A. Nasar, F. Mashkoor, Application of polyaniline-based
    adsorbents for dye removal from water and wastewater — a
    review, Environ. Sci. Pollut. Res., 26 (2019) 5333–5356. 
 
	-  Y. Chen, P. Pötschke, J. Pionteck, B. Voit, H.S. Qi, Fe3O4
    nanoparticles grown on cellulose/GO hydrogels as advanced
    catalytic materials for the heterogeneous fenton-like reaction,
    ACS Omega, 4 (2019) 5117–5125. 
 
  -  A.L. Zhang, L.Y. Zhu, Z.D. Nan, Ni-doped Fe3O4 nanoparticles
    coupled with SnS2 nanosheets as 0D/2D heterogeneous catalyst
    for photo-Fenton reaction, Mater. Chem. Phys., 224 (2019)
    156–168. 
 
  -  L.J. Xu, Y.J. Yang, W.Y. Li, Y.J. Tao, Z.G. Sui, S. Song, J. Yang,
    Three-dimensional macroporous graphene-wrapped zerovalent
    copper nanoparticles as efficient micro-electrolysispromoted
    Fenton-like catalysts for metronidazole removal, Sci.
    Total Environ., 658 (2019) 219–233. 
 
  -  L. Wang, J.J. Hou, S.Z. Liu, A.J. Carrier, T. Guo, Q.S. Liang,
    D. Oakley, X. Zhang, CuO nanoparticles as haloperoxidase-mimics:
    chloride-accelerated heterogeneous Cu-Fenton chemistry
    for H2O2 and glucose sensing, Sens. Actuators, B, 287 (2019)
    180–184. 
 
  -  A. Hassani, G. Çelikdağ, P. Eghbali, M. Sevim, S. Karaca,
    Ö. Metin, Heterogeneous sono-Fenton-like process using
    magnetic cobalt ferrite-reduced graphene oxide (CoFe2O4-rGO)
    nanocomposite for the removal of organic dyes from aqueous
    solution, Ultrason. Sonochem., 40 (2018) 841–852. 
 
  -  J.F. Qu, T.H. Che, L.B. Shi, Q.H. Lu, S.T. Qi, A novel magnetic silica
    supported spinel ferrites NiFe2O4 catalyst for heterogeneous
    Fenton-like oxidation of rhodamine B, Chin. Chem. Lett., 30
    (2019) 1198–1203. 
 
  -  Y.F. Diao, Z.K. Yan, M. Guo, X.D. Wang, Magnetic multi-metal
    co-doped magnesium ferrite nanoparticles: an efficient visible
    light-assisted heterogeneous Fenton-like catalyst synthesized
    from saprolite laterite ore, J. Hazard. Mater., 344 (2018) 829–838. 
 
  -  M.R. Heidari, R.S. Varma, M. Ahmadian, M. Pourkhosravani,
    S.N. Asadzadeh, P. Karimi, M. Khatami, Photo-Fenton like
    catalyst system: activated Carbon/CoFe2O4 nanocomposite
    for reactive dye removal from textile wastewater, Appl. Sci.,
    9 (2019) 963. 
 
  -  W. Wang, Q. Zhu, F. Qin, Q.G. Dai, X.Y. Wang, Fe doped
    CeO2 nanosheets as Fenton-like heterogeneous catalysts for
    degradation of salicylic acid, Chem. Eng. J., 333 (2018) 226–239. 
 
  -  A. Kalam, A.G. Al-Sehemi, M. Assiri, G. Du, T. Ahmad,
    I. Ahmad, M. Pannipara, Modified solvothermal synthesis of
    cobalt ferrite (CoFe2O4) magnetic nanoparticles photocatalysts
    for degradation of methylene blue with H2O2/visible light, Res.
    Phys., 8 (2018) 1046–1053. 
 
  -  P.A. Vinosha, S.J. Das, Investigation on the role of pH for the
    structural, optical and magnetic properties of cobalt ferrite
    nanoparticles and its effect on the photo-Fenton activity, Mater.
    Today:. Proc., 5 (2018) 8662–8671. 
 
  -  L.X. Zhang, Y.X. Sun, W.B. Jia, S.S. Ma, B. Song, Y. Li, H.F. Jiu,
    J.W. Liu, Multiple shell hollow CoFe2O4 spheres: synthesis,
    formation mechanism and properties, Ceram. Int., 40 (2014)
    8997–9002. 
 
  -  X.F. Wu, W. Wang, F. Li, S. Khaimanov, N. Tsidaeva, M. Lahoubi,
    PEG-assisted hydrothermal synthesis of CoFe2O4 nanoparticles
    with enhanced selective adsorption properties for different
    dyes, Appl. Surf. Sci., 389 (2016) 1003–1011. 
 
  -  M.P. Reddy, A.M.A. Mohamed, X.B. Zhou, S. Du, Q. Huang,
    A facile hydrothermal synthesis, characterization and magnetic
    properties of mesoporous CoFe2O4 nanospheres, J. Magn.
    Magn. Mater., 388 (2015) 40–44. 
 
  -  B. Paul, D.D. Purkayastha, S.S. Dhar, One-pot hydrothermal
    synthesis and characterization of CoFe2O4 nanoparticles and
    its application as magnetically recoverable catalyst in oxidation
    of alcohols by periodic acid, Mater. Chem. Phys., 181 (2016)
    99–105. 
 
  -  M. Vadivel, R.R. Babu, K. Sethuraman, K. Ramamurthi,
    M. Arivanandhan, Synthesis, structural, dielectric, magnetic
    and optical properties of Cr substituted CoFe2O4 nanoparticles
    by co-precipitation method, J. Magn. Magn. Mater., 362 (2014)
    122–129. 
 
  -  M. Vadivel, R.R. Babu, K. Ramamurthi, M. Arivanandhan,
    CTAB cationic surfactant assisted synthesis of CoFe2O4 magnetic
    nanoparticles, Ceram. Int., 42 (2016) 19320–19328. 
 
  -  S. Ayyappan, J. Philip, B. Raj, A facile method to control the
    size and magnetic properties of CoFe2O4 nanoparticles, Mater.
    Chem. Phys., 115 (2009) 712–717. 
 
  -  K. Praveena, B. Radhika, S. Srintah, Size effects on structural
    and magnetic properties of CoFe2O4 nanoparticles prepared
    by co-precipitation method, AIP Conf. Proc., 1447 (2012)
    289–290. 
 
  -  M. Vadivel, R.R. Babu, K. Ramamurthi, M. Arivanandhan,
    Effect of PVP concentrations on the structural, morphological,
    dielectric and magnetic properties of CoFe2O4 magnetic
    nanoparticles, Nano-Struct. Nano-Objects, 11 (2017) 112–123. 
 
  -  M. Vadivel, R.R. Babu, M. Arivanandhan, K. Ramamurthi,
    Y. Hayakawa, Role of SDS surfactant concentrations on the
    structural, morphological, dielectric and magnetic properties of
    CoFe2O4 nanoparticles, RSC Adv., 5 (2015) 27060–27068. 
 
  -  W.Y. Fu, S.K. Liu, W.H. Fan, H.B. Yang, X.F. Pang, J. Xu,
    G.T. Zou, Hollow glass microspheres coated with CoFe2O4 and
    its microwave absorption property, J. Magn. Magn. Mater.,
    316 (2007) 54–58. 
 
  -  Z. Ding, W. Wang, Y.J. Zhang, F. Li, J.P. Liu, Synthesis,
    characterization and adsorption capability for Congo red of
    CoFe2O4 ferrite nanoparticles, J. Alloys Compd., 640 (2015)
    362–370. 
 
  -  J.K. Rajput, G. Kaur, CoFe2O4 nanoparticles: an efficient
    heterogeneous magnetically separable catalyst for “click”
    synthesis of arylidene barbituric acid derivatives at room
    temperature, Chin. J. Catal., 34 (2013) 1697–1704. 
 
  -  L.L. Lv, Q. Xu, R. Ding, L. Qi, H.Y. Wang, Chemical synthesis of
    mesoporous CoFe2O4 nanoparticles as promising bifunctional
    electrode materials for supercapacitors, Mater. Lett., 111 (2013)
    35–38. 
 
  -  H.X. Zhang, H.R. Li, Z.J. Wang, B. Li, X.W. Cheng, Q.F. Cheng,
    Synthesis of magnetic CoFe2O4 nanoparticles and their
    efficient degradation of diclofenac by activating persulfate via
    formation of sulfate radicals, J. Nanosci. Nanotechnol., 18 (2018)
    6942–6948. 
 
  -  R. Qin, F. Li, W. Jiang, L. Liu, Salt-assisted low temperature
    solid state synthesis of high surface area CoFe2O4 nanoparticles,
    J. Mater. Sci. Technol., 25 (2009) 69–72. 
 
  -  Z. Jiao, X. Geng, M.H. Wu, Y. Jiang, B. Zhao, Preparation
    of CoFe2O4 nanoparticles by spraying co-precipitation and
    structure characterization, Colloids Surf., A, 313 (2008) 31–34. 
 
  -  K.K. Senapati, C. Borgohain, P. Phukan, Synthesis of highly
    stable CoFe2O4 nanoparticles and their use as magnetically
    separable catalyst for Knoevenagel reaction in aqueous medium,
    J. Mol. Catal. A: Chem., 339 (2011) 24–31. 
 
  -  A.A. Al-Kahtani, M.F.A. Taleb, Photocatalytic degradation
    of Maxilon C.I. basic dye using CS/CoFe2O4/GONCs as a
    heterogeneous photo-Fenton catalyst prepared by gamma
    irradiation, J. Hazard. Mater., 309 (2016) 10–19. 
 
  -  X. Chen, Z. Wu, D. Liu, Z. Gao, Preparation of ZnO photocatalyst
    for the efficient and rapid photocatalytic degradation of azo
    dyes, Res. Lett., 12 (2017) 143. 
 
  -  H.Y. Li, Y.L. Li, L.J. Xiang, Q.Q. Huang, J.J. Qiu, H. Zhang,
    M.V. Sivaiah, F. Baron, J. Barrault, S. Petit, S. Valange, Heterogeneous
    photo-Fenton decolorization of Orange II over
    Al-pillared Fe-smectite: response surface approach, degradation
    pathway, and toxicity evaluation, J. Hazard. Mater., 287 (2015)
    32–41. 
 
  -  A. Khataee, P. Gholami, B. Vahid, Catalytic performance of
	  hematite nanostructures prepared by N2 glow discharge
    plasma in heterogeneous Fenton-like process for acid red
    17 degradation, J. Ind. Eng. Chem., 50 (2017) 86–95. 
 
  -  F.F. Dias, A.A.S. Oliveira, A.P. Arcanjo, F.C.C. Moura,
    J.G.A. Pacheco, Residue-based iron catalyst for the degradation
    of textile dye via heterogeneous photo-Fenton, Appl. Catal., B,
    186 (2016) 136–142. 
 
  -  H.C. Lan, A.M. Wang, R.P. Liu, H.J. Liu, J.H. Qu, Heterogeneous
    photo-Fenton degradation of acid red B over Fe2O3 supported
    on activated carbon fiber, J. Hazard. Mater., 285 (2015) 167–172. 
 
  -  Z. Jia, J. Kang, W.C. Zhang, W.M. Wang, C. Yang, H. Sun,
    D. Habibi, L.C. Zhang, Surface aging behaviour of Fe-based
    amorphous alloys as catalysts during heterogeneous photo
    Fenton-like process for water treatment, Appl. Catal., B, 204
    (2017) 537–547. 
 
  -  X.G. Shi, A. Tian, J.H. You, H. Yang, Y.Z. Wang, X.X. Xue,
    Degradation of organic dyes by a new heterogeneous Fenton
	  reagent-Fe2GeS4 nanoparticle, J. Hazard. Mater., 353 (2018)
    182–189. 
 
  -  Y. Ahmed, Z. Yaakob, P. Akhtar, Degradation and mineralization
    of methylene blue using a heterogeneous photo-Fenton catalyst
    under visible and solar light irradiation, Catal. Sci. Technol.,
    6 (2016) 1222–1232. 
 
  -  X.X. Tang, Y. Liu, Heterogeneous photo-Fenton degradation
    of methylene blue under visible irradiation by iron tetrasulphophthalocyanine
    immobilized layered double hydroxide
    at circumneutral pH, Dyes Pigm., 134 (2016) 397–408. 
 
  -  J. Zhang, F.-T. Hu, Q.-Q. Liu, X. Zhao, S.-Q. Liu, Application
    of heterogenous catalyst of tris(1,10)-phenanthroline iron(II)
    loaded on zeolite for the photo-Fenton degradation of
    methylene blue, React. Kinet. Mech. Lett., 103 (2011) 299–310. 
 
  -  F. Ji, C.L. Li, J.H. Zhang, L. Deng, Heterogeneous photo-Fenton
	  decolorization of methylene blue over LiFe(WO4)2 catalyst,
    J. Hazard. Mater., 186 (2011) 1979–1984. 
 
  -  K. Chanderia, S. Kumar, J. Sharma, R. Ameta, P.B. Punjabi,
    Degradation of Sunset Yellow FCF using copper loaded bentonite
	  and H2O2 as photo-Fenton like reagent, Arabian J. Chem.,
    10 (2017) S205–S211. 
 
  -  B. Kakavandi, A. Takdastan, S. Pourfadakari, M. Ahmadmoazzam,
    S. Jorfi, Heterogeneous catalytic degradation of organic
    compounds using nanoscale zero-valent iron supported on
    kaolinite: mechanism, kinetic and feasibility studies, J. Taiwan
    Inst. Chem. Eng., 96 (2019) 329–340. 
 
  -  J. Singh, S. Sharma, Aanchal, S. Basu, Synthesis of Fe2O3/TiO2
    monoliths for the enhanced degradation of industrial dye and
    pesticide via photo-Fenton catalysis, J. Photochem. Photobiol.,
    A, 376 (2019) 32–42. 
 
  -  L.J. Di, H. Yang, T. Xian, X.G. Liu, X.J. Chen, Photocatalytic
    and photo-Fenton catalytic degradation activities of Z-scheme
    Ag2S/BiFeO3 heterojunction composites under visible-light
    irradiation, Nanomaterials (Basel), 9 (2019) 399. 
 
  -  P.A. Vinosha, L.A. Mely, G.I.N. Mary, K. Mahalakshmi,
    S.J. Das, Study on cobalt ferrite nanoparticles synthesized
    by co-precipitation technique for photo-Fenton application,
    Mech. Mater. Sci. Eng. J., 9 (2017), doi:10.2412/mmse.36.49.466. 
 
  -  X.L. Liang, Y.H. Zhong, S.Y. Zhu, L.Y. Ma, P. Yuan, J.X. Zhu,
    H.P. He, Z. Jiang, The contribution of vanadium and titanium
    on improving methylene blue decolorization through heterogeneous
    UV-Fenton reaction catalyzed by their co-doped
    magnetite, J. Hazard. Mater., 199 (2012) 247–254. 
 
  -  X.Y. Jiang, L.L. Li, Y.R. Cui, F.L. Cui, New branch on old tree:
	  green-synthesized RGO/Fe3O4 composite as a photo-Fenton
    catalyst for rapid decomposition of methylene blue, Ceram. Int.,
    43 (2017) 14361–14368. 
 
  -  Y.Y. Liu, W. Jin, Y.P. Zhao, G.S. Zhang, W. Zhang, Enhanced
    catalytic degradation of methylene blue by α-Fe2O3/graphene
    oxide via heterogeneous photo-Fenton reactions, Appl. Catal.,
    B, 206 (2017) 642–652. 
 
  -  K.M. Reza, A. Kurny, F. Gulshan, Photocatalytic degradation
    of methylene blue by magnetite+H2O2+UV process, J. Environ.
    Sci. Dev., 7 (2016) 325. 
 
  -  J.R. Kim, E.S. Kan, Heterogeneous photo-Fenton oxidation of
    methylene blue using CdS-carbon nanotube/TiO2 under visible
	  light, J. Ind. Eng. Chem., 21 (2015) 644–652.