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Title: | Coagulation-flocculation of azo dye acid orange 7 with green refined laterite soil |
Authors: | Lau, Yen Yie Wong, Yee Shian Teng, Tjoon Tow Norhashimah, Morad Mohd Rafatullah Ong, Soon-An yswong@unimap.edu.my |
Keywords: | Acid Orange 7 Azo dye Coagulation Dye degradation Laterite soil |
Issue Date: | 15-Jun-2014 |
Publisher: | Elsevier B.V. |
Citation: | Chemical Engineering Journal, vol.246, 2014, pages 383-390 |
Abstract: | A novel degradation pathway of Acid Orange 7 (AO 7) by laterite soil in coagulation process is suggested. AO 7 has a strong azo bond links with benzene and naphthalene rings. The rings in AO 7 can be cleaved during coagulation and flocculation by laterite soil. Laterite soil rich in silica component could treat AO 7 with 98.43% color removal at pH 2. It could degrade azo dye molecule to the simplest hydrocarbon structure and non-toxic products in coagulation process through a linkage of reactions: C. N bond cleavage, desulfonation, silication, diazene reductase and polymerization. Ascertainment of the degradation pathway and products were characterized by UV-Vis and FT-IR techniques. The results show that laterite soil is bi-functional as a coagulant as well as a flocculant. Sludge Volume Index (SVI) with sludge generated as low as 21.703. mL/g provides evidence that, laterite soil has polymerization characteristic by forming n-methylsisiloxane and n-methyldisilathiane. Laterite soil detached sulfate ion in AO 7 to form n-methyldisilathiane, indirectly preventing sulfate ion to be exposed to environment. |
Description: | Link to publisher's homepage at http://www.journals.elsevier.com/ |
URI: | http://dspace.unimap.edu.my:80/xmlui/handle/123456789/42194 |
ISSN: | 1385-8947 |
Appears in Collections: | Wong Yee Shian, Assoc. Prof. Ts. Dr. |
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Coagulation-flocculation of azo dye acid orange 7 with green refined laterite soil.pdf | 19.68 kB | Adobe PDF | View/Open |
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