1. W. Francis, Coal, Its Formation and Composition, 2nd ed., Edward Arnold, London, UK, 1961.
  2. A.S. Azmi, S. Yusup, S. Muhamad, The influence of temperature on adsorption capacity of Malaysian coal, Chem. Eng. Process., 45 (2006) 392–396.
  3. S.S. Idris, N.A. Rahman, K. Ismail, A.B. Alias, Z.A. Rashid, J.A.M.J. Mohd, Investigation on thermochemical behaviour of low rank Malaysian coal, oil palm biomass and their blends during pyrolysis via thermogravimetric analysis (TGA), Bioresour. Technol., 101 (2010) 4584–4592.
  4. A.U. Ambun, Malaysia’s Coal Resource: Opportunities and Challenges, Department of Mineral and Geosciences Malaysia, Sarawak, 2003. Available at: SeminarP123.html (Accessed 8 December 2003).
  5. C.B. Lim, Environmental Protection in Coal Utilization and Its Problems at Sultan Salahuddin Abdul Aziz Power Station, Kapar, National Energy Corporation, 1991.
  6. J. Xu, L. Chen, H. Qu, Y. Jiao, J. Xie, G. Xing, Preparation and characterization of activated carbon from reedy grass leaves by chemical activation with H3PO4, Appl. Surface Sci., 320 (2014) 674–680.
  7. A.H. Jawad, R.A. Rashid, K. Ismail, S. Sabar, High surface area mesoporous activated carbon developed from coconut leaf by chemical activation with H3PO4 for adsorption of methylene blue, Desal. Wat. Treat., 74 (2017) 326–335.
  8. A.H. Jawad, S. Sabar, M.A.M. Ishak, L.D. Wilson, S.S.A. Norrahma, M.K. Talari, A.M. Farhan, Microwave-assisted preparation of mesoporous activated carbon from coconut (Cocos nucifera) leaf by H3PO4-activation for methylene blue adsorption, Chem. Eng. Commun., 204 (2017) 1143–1156.
  9. A.H. Jawad, R.A. Rashid, M.A.M. Ishak, L.D. Wilson, Adsorption of methylene blue onto activated carbon developed from biomass waste by H2SO4 activation: kinetic, equilibrium and thermodynamic studies, Desal. Wat. Treat., 57 (2016) 25194–25206.
  10. A.H. Jawad, M.A.M. Ishak, A.M. Farhan, K. Ismail, Response surface methodology approach for optimization of color removal and COD reduction of methylene blue using microwave-induced NaOH activated carbon from biomass waste, Desal. Wat. Treat., 62 (2017) 208–220.
  11. F. Marrakchi, M.J. Ahmed, W.A. Khanday, M. Asif, B.H. Hameed, Mesoporous-activated carbon prepared from chitosan flakes via single-step sodium hydroxide activation for the adsorption of methylene blue, Int. J. Biol. Macromol., 98 (2017) 233–239.
  12. L. Gao, F. Dong, Q. Dai, G. Zhong, U. Halik, D. Lee, Coal tar residues based activated carbon: preparation and characterization, J. Taiwan Inst. Chem. Eng., 63 (2016) 166–169.
  13. R. Acosta, V. Fierro, A.M. Yuso, D. Nabarlatz, A. Celzard, Tetracycline adsorption onto activated carbons produced by KOH activation of tyre pyrolysis char, Chemosphere, 149 (2016) 168–176.
  14. A.H. Jawad, N.F.H. Mamat, M.F. Abdullah, K. Ismail, Adsorption of methylene blue onto acid-treated mango peels: kinetic, equilibrium and thermodynamic, Desal. Wat. Treat., 59 (2017) 210–219.
  15. E. Yagmur, M. Ozmak, Z. Aktas, A novel method for production of activated carbon from waste tea by chemical activation with microwave energy, Fuel, 87 (2008) 3278–3285.
  16. Q.S. Liu, T. Zheng, N. Li, P. Wang, G. Abulikemu, Modification of bamboo-based activated carbon using microwave radiation and its effects on the adsorption of methylene blue, Appl. Surf. Sci., 256 (2010) 3309–3315.
  17. X. Wang, X. Liang, Y. Wang, X. Wang, M. Liu, D. Yin, Y. Zhang, Adsorption of copper (II) onto activated carbons from sewage sludge by microwave-induced phosphoric acid and zinc chloride activation, Desalination, 278 (2011) 231–237.
  18. R.A. Rashid, A.H. Jawad, M.A.M. Ishak, N.N. Kasim, KOH-activated carbon developed from biomass waste: adsorption equilibrium, kinetic and thermodynamic studies for Methylene blue uptake, Desal. Wat. Treat., 57 (2016) 27226–27236.
  19. F. Aci, M. Nebioglu, M. Arslan, M. Imamoglu, M. Zengin, M. Kuecuekislamoglu, Preparation of activated carbon from sugar beet molasses and adsorption of methylene blue, Fresenius Environ. Bull., 17 (2008) 997–1001.
  20. A.H. Jawad, A.F. Alkarkhi, N.S.A. Mubarak, Photocatalytic decolorization of methylene blue by an immobilized TiO2 film under visible light irradiation: optimization using response surface methodology (RSM), Desal. Wat. Treat., 56 (2015) 161–172.
  21. A.H. Jawad, M.A. Islam, B.H. Hameed, Cross-linked chitosan thin film coated onto glass plate as an effective adsorbent for adsorption of reactive orange 16, Int. J. Biol. Macromol., 95 (2017) 743–749.
  22. N.S.A. Mubarak, A.H. Jawad, W.I. Nawawi, Equilibrium, kinetic and thermodynamic studies of Reactive Red 120 dye adsorption by chitosan beads from aqueous solution, Energy Ecol. Environ., 2 (2017) 85–93.
  23. M.A. Jamaluddin, K. Ismail, M.A.M. Ishak, Z. Ab Ghani, M.F. Abdullah, M.T.U. Safian, N.I.N. Mohd Hakimi, Microwaveassisted pyrolysis of palm kernel shell: optimization using response surface methodology (RSM), Renew. Energy, 55 (2013) 357–365.
  24. M. Ahmedna, W.E. Marshall, R.M. Rao, S.J. Clarke, Use of filtration and buffers in raw sugar colour measurements, J. Sci. Food Agric., 75 (1997) 109–116.
  25. K.S.W. Sing, D.H. Everett, R.A.W. Haul, L. Moscou, R.A. Pierotti, J. Rouquerol, T. Siemienewska, Reporting physisorption data for gas–solid systems, Pure Appl. Chem., 57 (1985) 603–619.
  26. Y. Guo, K. Yu, Z. Wang, H. Xu, Effects of activation conditions on preparation of porous carbon from rice husk, Carbon, 41 (2000) 1645–1687.
  27. K.Y. Foo, B.H. Hameed, Porous structure and adsorptive properties of pineapple peel based activated carbons prepared via microwave assisted KOH and K2CO3 activation, Microporous Mesoporous Mater., 148 (2012) 191–195.
  28. K.Y. Foo, B.H. Hameed, Utilization of oil palm biodiesel solid residue as renewable sources for preparation of granular activated carbon by microwave induced KOH activation, Bioresour. Technol., 130 (2013) 696–702.
  29. K.Y. Foo, B.H. Hameed, Preparation of oil palm (Elaeis) empty fruit bunch activated carbon by microwave-assisted KOH activation for the adsorption of methylene blue, Desalination, 275 (2011) 302–305.
  30. K.Y. Foo, B.H. Hameed, Utilization of rice husks as a feedstock for preparation of activated carbon by microwave induced KOH and K2CO3 activation, Bioresour. Technol., 102 (2011) 9814–9817.
  31. H. Deng, G. Li, H. Yang, J. Tang, J. Tang, Preparation of activated carbons from cotton stalk by microwave assisted KOH and K2CO3 activation, Chem. Eng. J., 163 (2010) 373–381.
  32. K.Y. Foo, B.H. Hameed, Microwave-assisted preparation of oil palm fiber activated carbon for methylene blue adsorption, Chem. Eng. J., 166 (2011) 792–795.
  33. K.Y. Foo, B.H. Hameed, Preparation and characterization of activated carbon from pistachio nut shells via microwaveinduced chemical activation, Biomass Bioenergy, 35 (2011) 3257–3261.
  34. J. Laine, A. Calafat, Factors affecting the preparation of activated carbons from coconut shell catalized by potassium, Carbon, 29 (1991) 949–953.
  35. Q. Jiang, M.Z. Qu, G.M. Zhou, B.L. Zhang, Z.L. Yu, A study of activated carbon nanotubes as electrochemical super capacitors electrode materials, Mater. Lett., 57 (2002) 988–991.
  36. M.D. Pavlović, A.V. Buntić, K.R. Mihajlovski, S.S. Šiler- Marinković, D.G. Antonović, Ž. Radovanović, S.I. Dimitrijević- Branković, Rapid cationic dye adsorption on polyphenolextracted coffee grounds—a response surface methodology approach, J. Taiwan Inst. Chem. Eng., 45 (2014) 1691–1699.
  37. A.H. Jawad, M.A. Nawi, Characterizations of the photocatalytically-oxidized cross-linked chitosanglutaraldehyde and its application as a sub-layer in the TiO2/CS-GLA bilayer photocatalyst system, J. Polym. Environ., 20 (2012) 817–829.
  38. J. Coates, Interpretation of Infrared Spectra, A Practical Approach, R.A. Meyers, Ed., Encyclopedia of Analytical Chemistry, John Wiley & Sons Ltd., Chichester, 2000, pp. 10815–10837.
  39. M.N. Nawi, A.H. Jawad, S. Sabar, W.S.W. Ngah, Photocatalyticoxidation of solid state chitosan by immobilized bilayer assembly of TiO2–chitosan under a compact household fluorescent lamp irradiation, Carbohydr. Polym., 83 (2011) 1146–1152.
  40. B. Hayati, N.M. Mahmoodi, Modification of activated carbon by the alkaline treatment to remove the dyes from wastewater: mechanism, isotherm and kinetic, Desal. Wat. Treat., 47 (2012) 322–333.
  41. M.A. Islam, S. Sabar, A. Benhouri, W.A. Khanday, M. Asif, B.H. Hameed, Nanoporous activated carbon prepared from karanj (Pongamia pinnata) fruit hulls for methylene blue adsorption, J. Taiwan Inst. Chem. Eng., 74 (2017) 96–104.
  42. S. Chakraborty, S. Chowdhury, P. Das Saha, Adsorption of Crystal Violet from aqueous solution onto NaOH-modified rice husk, Carbohydr. Polym., 86 (2011) 1533–1541.
  43. M.V. Lopez-Ramon, F. Stoeckli, C. Moreno-Castilla, F. Carrasco-Marin, On the characterization of acidic and basic surface sites on carbons by various techniques, Carbon, 37 (1999) 1215–1221.
  44. I. Langmuir, The adsorption of gases on plane surfaces of glass, mica and platinum, J. Am. Chem. Soc., 40 (1918) 1361–1403.
  45. H. Freundlich, Ueber die adsorption in Loesungen (Adsorption in solution), Z. Phys. Chem., 57 (1906) 385–470.
  46. M.J. Temkin, V. Pyzhev, Recent modifications to Langmuir isotherms, Acta Physiochim. URSS, 12 (1940) 217–222.
  47. S. Lagergren, Zur theorie der sogenannten adsorption geloster stoffe, K. Sven. Vetensk.akad. Handl., 24 (1898) 1–39.
  48. Y.S. Ho, G. McKay, Sorption of dye from aqueous solution by peat, Chem. Eng. J., 70 (1998) 115–124.
  49. G. Karaçetin, S. Sivrikaya, M. Imamoğlu, Adsorption of methylene blue from aqueous solutions by activated carbon prepared from hazelnut husk using zinc chloride, J. Anal. Appl. Pyrolysis, 110 (2014) 270–276.
  50. M.J. Jaycock, G.D. Parfitt, Chemistry of Interfaces, Ellis Horwood Ltd., Onichester, 1981.
  51. K.E. Noll, V. Gounaris, W.S. Hou, Adsorption Technology for Air and Water Pollution Control, Lewis Publishers, Chelsea, MI, 1992, pp. 21–22.
  52. Y. Yu, Y.Y. Zhuang, Z.H. Wang, Adsorption of water-soluble dye onto functionalized resin, J. Colloid Interface Sci., 242 (2001) 288–293.
  53. D.D. Asouhidou, K.S. Triantafyllidis, N.K. Lazaridis, K.A. Matis, S.S. Kim, T.J. Pinnavaia, Sorption of reactive dyes from aqueous solutions by ordered hexagonal and disordered mesoporous carbons, Microporous Mesoporous Mater., 117 (2009) 257–267.