Removal of methyl orange from aqueous solution by natural clay / 由 Muhammad Ariff Abd. Aziz author, Aishah Abdul Jalil author, Sugeng Triwahyono author, Nur Hanis Hayati Hairom, 1984- author, Nurul Aini Mohamed Razali, 1984- author, Siti Hazirah Adam, 1986- author, International Conference of Workshops on Basic of Applied Scinces (2nd : 2009 : Johor)