Ghosh T, Ullah K, Nikam V, Park C-Y, Meng Z-D, Oh W-C (2013b) The characteristic study and
sonocatalytic performance of CdSe–graphene as catalyst in the degradation of azo dyes in
aqueous solution under dark conditions. Ultrason Sonochem 20:768–776. https://doi.org/10.
1016/j.ultsonch.2012.09.005
Grimme S (2004) Accurate description of van der Waals complexes by density functional theory
including empirical corrections. J Comput Chem 25:1463–1473
Grimme S (2006) Semiempirical GGA-type density functional constructed with a long-range
dispersion correction. J Comput Chem 27:1787–1799
Gu L, Wang J, Zou Z, Han X (2014) Graphitic-C 3 N 4 -hybridized TiO 2 nanosheets with reactive {001}
facets to enhance the UV- and visible-light photocatalytic activity. J Hazard Mater 268:216–223
Guo S, Dong S (2011) Graphene nanosheet: synthesis, molecular engineering, thin film, hybrids,
and energy and analytical applications. Chem Soc Rev 40:2644–2672
Guo H-L, Wang X-F, Qian Q-Y, Wang F-B, Xia X-H (2009) A green approach to the synthesis of
graphene nanosheets. ACS Nano 3:2653–2659
Guo J, Zhu S, Chen Z, Li Y, Yu Z, Liu Q, Li J, Feng C, Zhang D (2011) Sonochemical synthesis of
TiO 2 nanoparticles on graphene for use as photocatalyst. Ultrason Sonochem 18:1082–1090
Guo J, Wang R, Tjiu WW, Pan J, Liu T (2012) Synthesis of Fe nanoparticles@graphene composites
for environmental applications. J Hazard Mater 225:63–73. https://doi.org/10.1016/j.jhazmat.
2012.04.065
Gupta VK, Ali I, Saleh TA, Nayak A, Agarwal S (2012) Chemical treatment technologies for wastewater recycling-an overview. RSC Adv 2:6380–6388
Hao L, Song H, Zhang L, Wan X, Tang Y, Lv Y (2012) SiO 2 /graphene composite for highly
selective adsorption of Pb (II) ion. J Colloid Interface Sci 369:381–387. https://doi.org/10.1016/
j.jcis.2011.12.023
He F, Fan J, Ma D, Zhang L, Leung C, Chan HL (2010) The attachment of Fe 3 O 4 nanoparticles to
graphene oxide by covalent bonding. Carbon 48:3139–3144
Hernandez Y, Nicolosi V, Lotya M, Blighe FM, Sun Z, De S, McGovern IT, Holland B, Byrne M,
Gun’Ko YK, Boland JJ, Niraj P, Duesberg G, Krishnamurthy S, Goodhue R, Hutchison J,
Scardaci V, Ferrari AC, Coleman JN (2008) High-yield production of graphene by liquid-phase
exfoliation of graphite. Nat Nanotechnol 3:563–568. http://www.nature.com/nnano/journal/v3/
n9/suppinfo/nnano.2008.215_S1.html
Heyd J, Scuseria GE, Ernzerhof M (2003) Hybrid functionals based on a screened Coulomb
potential. J Chem Phys 118:8207–8215
Hitoki G, Ishikawa A, Takata T, Kondo JN, Hara M, Domen K (2002) Ta 3 N 5 as a novel visible
light-driven photocatalyst (λ < 600 nm). Chem Lett 31:736–737
Hoffmann MR, Martin ST, Choi W, Bahnemann DW (1995) Environmental applications of
semiconductor photocatalysis. Chem Rev 95:69–96
Hohenberg P, Kohn W (1964) Inhomogeneous electron gas. Phys Rev 136:B864–B671
Hontoria-Lucas C, López-Peinado A, López-González JD, Rojas-Cervantes M, Martin-Aranda R
(1995) Study of oxygen-containing groups in a series of graphite oxides: physical and chemical
characterization. Carbon 33:1585–1592
Hou H, Zhou R, Wu P, Wu L (2012) Removal of Congo red dye from aqueous solution with
hydroxyapatite/chitosan composite. Chem Eng J 211:336–342
Hummers WS, Offeman RE (1958) Preparation of graphitic oxide. J Am Chem Soc 80:1339–1339.
https://doi.org/10.1021/ja01539a017
Ismail AA, Geioushy R, Bouzid H, Al-Sayari SA, Al-Hajry A, Bahnemann DW (2013) TiO 2
decoration of graphene layers for highly efficient photocatalyst: impact of calcination at
different gas atmosphere on photocatalytic efficiency. Appl Catal B 129:62–70
Jiao L, Wang X, Diankov G, Wang H, Dai H (2010) Facile synthesis of high-quality graphene
nanoribbons. Nat Nanotechnol 5:321–325
Kapilashrami M, Zhang Y, Liu Y-S, Hagfeldt A, Guo J (2014) Probing the optical property and
electronic structure of TiO 2 nanomaterials for renewable energy applications. Chem Rev
114:9662–9707
Katsnelson MI (2007) Graphene: carbon in two dimensions. Mater Today 10:20–27
28
F. Opoku et al.
sonocatalytic performance of CdSe–graphene as catalyst in the degradation of azo dyes in
aqueous solution under dark conditions. Ultrason Sonochem 20:768–776. https://doi.org/10.
1016/j.ultsonch.2012.09.005
Grimme S (2004) Accurate description of van der Waals complexes by density functional theory
including empirical corrections. J Comput Chem 25:1463–1473
Grimme S (2006) Semiempirical GGA-type density functional constructed with a long-range
dispersion correction. J Comput Chem 27:1787–1799
Gu L, Wang J, Zou Z, Han X (2014) Graphitic-C 3 N 4 -hybridized TiO 2 nanosheets with reactive {001}
facets to enhance the UV- and visible-light photocatalytic activity. J Hazard Mater 268:216–223
Guo S, Dong S (2011) Graphene nanosheet: synthesis, molecular engineering, thin film, hybrids,
and energy and analytical applications. Chem Soc Rev 40:2644–2672
Guo H-L, Wang X-F, Qian Q-Y, Wang F-B, Xia X-H (2009) A green approach to the synthesis of
graphene nanosheets. ACS Nano 3:2653–2659
Guo J, Zhu S, Chen Z, Li Y, Yu Z, Liu Q, Li J, Feng C, Zhang D (2011) Sonochemical synthesis of
TiO 2 nanoparticles on graphene for use as photocatalyst. Ultrason Sonochem 18:1082–1090
Guo J, Wang R, Tjiu WW, Pan J, Liu T (2012) Synthesis of Fe nanoparticles@graphene composites
for environmental applications. J Hazard Mater 225:63–73. https://doi.org/10.1016/j.jhazmat.
2012.04.065
Gupta VK, Ali I, Saleh TA, Nayak A, Agarwal S (2012) Chemical treatment technologies for wastewater recycling-an overview. RSC Adv 2:6380–6388
Hao L, Song H, Zhang L, Wan X, Tang Y, Lv Y (2012) SiO 2 /graphene composite for highly
selective adsorption of Pb (II) ion. J Colloid Interface Sci 369:381–387. https://doi.org/10.1016/
j.jcis.2011.12.023
He F, Fan J, Ma D, Zhang L, Leung C, Chan HL (2010) The attachment of Fe 3 O 4 nanoparticles to
graphene oxide by covalent bonding. Carbon 48:3139–3144
Hernandez Y, Nicolosi V, Lotya M, Blighe FM, Sun Z, De S, McGovern IT, Holland B, Byrne M,
Gun’Ko YK, Boland JJ, Niraj P, Duesberg G, Krishnamurthy S, Goodhue R, Hutchison J,
Scardaci V, Ferrari AC, Coleman JN (2008) High-yield production of graphene by liquid-phase
exfoliation of graphite. Nat Nanotechnol 3:563–568. http://www.nature.com/nnano/journal/v3/
n9/suppinfo/nnano.2008.215_S1.html
Heyd J, Scuseria GE, Ernzerhof M (2003) Hybrid functionals based on a screened Coulomb
potential. J Chem Phys 118:8207–8215
Hitoki G, Ishikawa A, Takata T, Kondo JN, Hara M, Domen K (2002) Ta 3 N 5 as a novel visible
light-driven photocatalyst (λ < 600 nm). Chem Lett 31:736–737
Hoffmann MR, Martin ST, Choi W, Bahnemann DW (1995) Environmental applications of
semiconductor photocatalysis. Chem Rev 95:69–96
Hohenberg P, Kohn W (1964) Inhomogeneous electron gas. Phys Rev 136:B864–B671
Hontoria-Lucas C, López-Peinado A, López-González JD, Rojas-Cervantes M, Martin-Aranda R
(1995) Study of oxygen-containing groups in a series of graphite oxides: physical and chemical
characterization. Carbon 33:1585–1592
Hou H, Zhou R, Wu P, Wu L (2012) Removal of Congo red dye from aqueous solution with
hydroxyapatite/chitosan composite. Chem Eng J 211:336–342
Hummers WS, Offeman RE (1958) Preparation of graphitic oxide. J Am Chem Soc 80:1339–1339.
https://doi.org/10.1021/ja01539a017
Ismail AA, Geioushy R, Bouzid H, Al-Sayari SA, Al-Hajry A, Bahnemann DW (2013) TiO 2
decoration of graphene layers for highly efficient photocatalyst: impact of calcination at
different gas atmosphere on photocatalytic efficiency. Appl Catal B 129:62–70
Jiao L, Wang X, Diankov G, Wang H, Dai H (2010) Facile synthesis of high-quality graphene
nanoribbons. Nat Nanotechnol 5:321–325
Kapilashrami M, Zhang Y, Liu Y-S, Hagfeldt A, Guo J (2014) Probing the optical property and
electronic structure of TiO 2 nanomaterials for renewable energy applications. Chem Rev
114:9662–9707
Katsnelson MI (2007) Graphene: carbon in two dimensions. Mater Today 10:20–27
28
F. Opoku et al.