Now showing 1 - 2 of 2
  • Publication
    Intermolecular mechanistic treatment of recalcitrant environmental pollutants: Azo, benzene, naphthalene and vinyl sulfone
    A new class of coagulant, from natural resource namely laterite soil has demonstrated efficiency in degrading a wide range of industrial organic pollutants into simple hydrocarbon structures or less toxic compounds. The composition study revealed the relative Si/Al/Fe: 0.57/0.33/0.10 ratios in laterite soil and surface morphology of laterite soil were investigated to analyze the fundamental degradation that drive the decolorization of Reactive Black 5 (RB 5). The interfacial and colloid aspects of laterite soil colloidosomes and dye particles were distinguished with the corresponding mechanism of coagulation–flocculation process. RB5 structure was destabilized by activation of laterite soil colloidosomes through charge neutralization and subsequent siloxane polymerization through enhancement of siloxanes monomers. This research also evaluated the rate laws and reaction mechanism for each of the main chemical network strands of RB 5. The result implied that all the chemical network strands followed the pseudo first order of reactions. Research approach has utilized Fourier Transform Infrared Spectroscopy, Gas Chromatography Mass Spectrometry and Ultraviolet–visible Spectrophotometry (FTIR, GCMS and UV–vis) to study the degradation intermediates structure, chemical derivatives and final products after coagulation–flocculation process.
  • Publication
    Corrosion Control by Using Zinc as Sacrificial Anode Cathodic Protection in Geopolymer Concrete
    ( 2020-01-01) ;
    Noratikah Md Zin
    ;
    Siti Aisyah Abd Razak
    ;
    Azmi Rahmat
    ;
    ;
    This research is about the corrosion control by using zinc as sacrificial anode cathodic protection in geopolymer concrete that is produced by the reaction of fly ash, fine aggregate, and coarse aggregate with an alkaline activator. Geopolymer is an alternative to the ordinary Portland cement (OPC) due to environmental friendly, low cost production, and workability. Tests are carried out on mild steel bar which embedded in 100 mm × 100 mm × 100 mm cube of geopolymer concrete. The potential values of the steel bar embedded in geopolymer concrete have been conducted by open circuit potential (OCP) testing. From the result obtained, the potential values of sacrificial anode cathodic protection samples were lower than control samples for 7 and 28 days cured which −0.967 V and −1.389 V, respectively. From Pourbaix diagram, the control samples were located at passivity region, while the SACP samples were located at immunity region.
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