References

  1. J. Zhu, C. Tang, J. Wei, Z. Li, M. Laipan, H. He, X. Liang, Q. Tao, L. Cai, Structural effects on dissolution of silica polymorphs in various solutions, Inorg. Chim. Acta, 471 (2018) 57–65.
  2. C. Tang, J. Zhu, Z. Li, R. Zhu, Q. Zhou, J. Wei, H. He, Q. Tao, Surface chemistry and reactivity of SiO2 polymorphs: a comparative study on α-quartz and α-cristobalite, Appl. Surf. Sci., 355 (2015) 1161–1167.
  3. R.K. Iler, The Chemistry of Silica, Solubility, Polymerization, Colloid and Surface Properties, and Biochemistry, John Wiley and Sons, New York, 1979.
  4. W-T. Tsai, K.-J. Hsien, C.-W. Lai, Chemical activation of spent diatomaceous earth by alkaline etching in the preparation of mesoporous adsorbents, Ind. Eng. Chem. Res., 43 (2004) 7513–7520.
  5. A. Modrzejewska-Sikorska, F. Ciesielczyk, T. Jesionowski, Synthesis and characterization of precipitated CuO·SiO2 oxide composites, Pigm. Resin Technol., 41 (2012) 71–80.
  6. H.E. Chalandar, H.R. Ghorbani, H. Attar, S.A. Alavi, Antifungal effect of copper and copper oxide nanoparticles against penicillium on orange fruit, Biosci. Biotechnol. Res. Asia, 14 (2017) 279–284.
  7. A. Azam, A.S. Ahmed, M. Oves, M.S. Khan, A. Memic, Sizedependent antimicrobial properties of CuO nanoparticles against Gram-positive and -negative bacterial strains, Int. J. Nanomed., 7 (2012) 3527–3535.
  8. A.P. Cano, A.V. Gillado, A.D. Montecillo, M.U. Herrera, Copper sulfate-embedded and copper oxide-embedded filter paper and their antimicrobial properties, Mater. Chem. Phys., 207 (2018) 147–153.
  9. M.T. Yagub, T.K. Sen, S. Afroze, H.M. Ang, Dye and its removal from aqueous solution by adsorption: a review, Adv. Colloid Interface, 209 (2014) 172–184.
  10. K.S. Bharathi, S.T. Ramesh, Removal of dyes using agricultural waste as low-cost adsorbents: a review, Appl. Water Sci., 3 (2013) 773–790.
  11. T. Ngulube, J.R. Gumbo, V. Masindi, A. Maity, An update on synthetic dyes adsorption onto clay-based minerals: a state-ofart review, J. Environ. Manage., 191 (2017) 35–57.
  12. Y.S. Al-Degs, M.I. El-Barghouthi, A.H. El-Sheikh, G.M. Walker, Effect of solution pH, ionic strength, and temperature on adsorption behavior of reactive dyes on activated carbon, Dyes Pigm., 77 (2008) 16–23.
  13. A.A. Adeyemo, I.O. Adeoye, O.S. Bello, Adsorption of dyes using different types of clay: a review, Appl. Water Sci., 7 (2017) 543–568.
  14. D. Karadag, E. Akgul, S. Tok, F. Erturk, M.A. Kaya, M. Turan, Basic and reactive dye removal using natural and modified zeolites, J. Chem. Eng. Data, 52 (2007) 2436–2441.
  15. Jumaeri, E. Kusumastuti, S.J. Santosa, Sutarno, Adsorption of crystal violet dye using zeolite A synthesized from coal fly ash. IOP Conf. Series: Mater. Sci. Eng., 172 (2017) 1–8.
  16. T.R. Barbosa, E.L. Foletto, G.L. Dotto, S.L. Jahn, Preparation of mesoporous geopolymer using metakaolin and rice husk ash as synthesis precursors and its use as potential adsorbent to remove organic dye from aqueous solutions, Ceram. Int., 44 (2018) 416–423.
  17. A.A. Siyal, M.R. Shamsuddin, M.I. Khan, N.E. Rabat, M. Zulfiqar, Z. Man, J. Siame, K.A. Azizli, A review on geopolymers as emerging materials for the adsorption of heavy metals and dyes, J. Environ. Manage., 224 (2018) 327–339.
  18. I. Anastopoulos, G.Z. Kyzas, Agricultural peels for dye adsorption: A review of recent literature, J. Mol. Liq., 200, Part B (2014) 381–389.
  19. M.M. Allingham, J.M. Cullen, C.H. Giles, S.K. Jain, J.S. Woods, Adsorption at inorganic surfaces. II. Adsorption of dyes and related compounds by silica, J. Appl. Chem., 8 (1958) 108–116.
  20. S. Chakrabarti, B.K. Dutta, On the adsorption and diffusion of Methylene Blue in glass fibers, J. Colloid Interface Sci., 286 (2005) 807–811.
  21. A. Krysztafkiewicz, S. Binkowski, T. Jesionowski, Adsorption of dyes on a silica surface, Appl. Surf. Sci., 199 (2002) 31–39.
  22. S. Kaneko, Adsorption of several dyes from aqueous solutions on silica-containing complex-oxide gels, Sep. Sci. Technol., 17 (1981) 1499–1510.
  23. M.N. Asl, N.M. Mahmodi, P. Teymouri, B. Shahmoradi, R. Rezaee, A. Maleki, Adsorption of organic dyes using copper oxide nanoparticles: isotherm and kinetic studies, Desal. Wat. Treat., 57 (2016) 25278–25287.
  24. R. Raghav, P. Aggarwal, S. Srivastava, Tailoring oxides of copper-Cu2O and CuO nanoparticles and evaluation of organic dyes degradation, AIP Conference Proc., 1724 (2016) 020078.
  25. A. Mazumder, R. Rano, Synthesis and characterization of fly ash modified copper oxide (FA/CuO) for photocatalytic degradation of methyl orange dye, Mater. Today- Proc., 5 (2018) 2281–2286.
  26. M. Fertani-Gmati, K. Brahim, I. Khattech, M. Jemal, Thermochemistry and kinetics of silica dissolution in NaOH solutions: Effect of the alkali concentration, Thermochim. Acta, 594 (2014) 58–67.
  27. A.L. Patterson, The Scherrer formula for X-ray particle size determination, Phys. Rev., 56 (1939) 978–982.
  28. B.H. Hameed, I.A.W. Tan, A.L. Ahmad, Adsorption isotherm, kinetic modeling and mechanism of 2,4,6-trichlorophenol on coconut husk-based activated carbon, Chem. Eng. J., 144 (2008) 235–244.
  29. K.L. Tan, B.H. Hameed, Insight into the adsorption kinetics models for the removal of contaminants from aqueous solutions, J. Taiwan Inst. Chem. Eng., 74 (2017) 25–48.
  30. K.Y. Foo, B.H. Hameed, Insights into the modeling of adsorption isotherm systems, Chem. Eng. J., 156 (2010) 2–10,
  31. R.B. Langston, E.A. Jenne, NaOH dissolution of some oxide impurities from kaolins, Clays Clay Miner., 12 (1964) 633–647.
  32. S.K. Zong, W. Wei, Z. Jiang, Z. Yan, J.J. Zhu, J. Xie, Characterization and comparison of uniform hydrophilic/hydrophobic transparent silica aerogel beads: skeleton strength and surface modification, RSC Adv., 68 (2015) 54806–55607.
  33. Munasir, Triwikantoro, M. Zainuri, Darminto, Synthesis of SiO2 nanopowders containing quartz and cristobalite phases from silica sands, Mater. Sci.-Poland, 33 (2015) 47–55.
  34. E.R. Lippincott, A. Van Valkenburg, C.E. Weir, E.N. Bunting, Infrared studies on polymorphs of silicon dioxide and germanium dioxide, J. Res. Nat. Bur. Stand., 61 (1958) 61–70.
  35. X. Su, J. Zhao, X. Zhao, Y. Guo, Y. Zhu, Z. Wang, A facile synthesis of Cu2O/SiO2 and Cu/SiO2 core–shell octahedral nanocomposites, Nanotechnology, 19 (2008) 1–8.
  36. J. Jiang, S.-H. Kim, L. Piao, The facile synthesis of Cu@SiO2 yolk–shell nanoparticles via a disproportionation reaction of silica-encapsulated Cu2O nanoparticle aggregates, Nanoscale, 7 (2015) 8299–8303.
  37. P.K. Raul, S. Senapati, A.K. Sahoo, I.M. Umlong, R.R. Devi, A.J. Thakur, V. Veer, CuO nanorods: a potential and efficient adsorbent in water purification, RSC Adv., 4 (2014) 40580–40587.
  38. Mineralogy Database. Available at: www.webmineral.com.
  39. www.saylor.org/site/wpcontent/uploads/2011/06/Ionic-Radius.pdf.
  40. R. Palanivelu, P. Manivasakan, N.R. Dhineshbabu, V. Rajendran, Comparative study on isolation and characterization of amorphous silica nanoparticles from different grades of rice hulls, Synth. React. Inorg. Met. Org. Chem., 46 (2016) 445–452.
  41. S. Sompech, T. Dasri, S. Thaomola, Preparation and characterization of amorphous silica and calcium oxide from agricultural wastes, Orient. J. Chem., 32 (2016) 1923–1928.
  42. P. Deshmukh, J. Bhatt, D. Peshwe, S. Pathak, Determination of silica activity index and XRD, SEM and EDS studies of amorphous SiO2 extracted from rice husk ash, Trans. Indian Inst. Met., 65 (2012) 63–68.
  43. J. Chen, Y. Sheng, Y. Song, M. Chang, X. Zhang, L. Cui, D. Meng, H. Zhu, Z. Shi, H. Zou, Multimorphology mesoporous silica nanoparticles for dye adsorption and multicolor luminescence applications, ACS Sustain. Chem. Eng., 6 (2018) 3533–3545.
  44. P. Hadi, J. Guo, J. Barford, G. McKay, Multilayer dye adsorption in activated carbons—facile approach to exploit vacant sites and interlayer charge interaction, Environ. Sci. Technol., 50 (2016) 5041–5049.
  45. V.K. Gupta, Suhas, Application of low-cost adsorbents for dye removal – a review, J. Environ. Manage., 90 (2009) 2313–2342.