Reductive decolorization of acid blue 113 azo dye by nanoscale zero-valent iron and iron-based bimetallic particles

Abstract

In this study, effectively reductive decolorization of wastewater with synthesized C.I. Acid Blue 113 (AB113) was obtained by nanoscale particles of zero-valent iron (NZVI), bimetallic iron/nickel (nFe/Ni) and iron/zinc (nFe/Zn) which were prepared in the laboratory with large surface area and reductive potential. The particle size was identified less than 100 nm by field emission scanning electron microscope (FESEM) that nickel was homogeneously distributed with iron element by FESEM mapping for nFe/Ni sample. Moreover, the surface areas of bimetallic nanoparticle samples such as nFe/Ni and nFe/Zn were significantly increased than that of NZVI. The effects of experimental variables such as nanoparticle dosage, initial dye concentration, and metal composition on AB113 decolorizing were investigated. From the results, the synthesized AB113 wastewater of high color and total organic carbon (TOC) was successfully reductive decolorized using three iron-based nanoparticle samples. The optimal conditions were obtained the best color removal efficiencies in 30 min while an initial dye concentration of 100 mg l −1 and nFe/Ni dosage of 0.2 g l −1 . Besides, a modified pseudo-first-order kinetic equation was developed to describe the color removal efficiency affected by both initial dye concentration and nanoparticle dosage. The higher nanoparticle dosage, the higher color and TOC removal efficiencies were obtained within the nanoparticle dosage of 0.2 g l −1 . Furthermore, among three iron-based nanoparticle samples, nFe/Ni preformed the best color and TOC removal as well as durability.

Development of sustainable acid blue 113 dye adsorption system using nutraceutical industrial Tribulus terrestris spent

“…The techniques, methods and procedures reported in literature for the remediation of AB113 dye can be broadly classified into biological-cum-chemical [13,20,21,28,51] electrocoagulation [39], physical methods using UV radiations [36,44,[46][47][48], photocatalytic degradation [66,74], low frequency ultrasound assisted degradation [40], nanomaterials [49] and use of inorganic materials including activated carbons [16,34,42,43,45,63]. Nevertheless, huge initial cost in installing operational plant, high-operational cost, regeneration problem, secondary pollutants, sensitivity to variations in wastewater input, interference by some wastewater constituents, and residual sludge generation are some associated problems in these methods [11,61].…”

Rapid reductive degradation of azo and anthraquinone dyes by nanoscale zero-valent iron

“…NZVI has been used for the removal of various textile dyes. Azo dyes like Acid Blue A, Methyl Orange, Sunset Yellow (Rahman et al 2014), Reactive Yellow K-RN (Mao et al 2015), Acid Blue 113 (Shu et al 2016), Reactive Black 5, Reactive Red 198, and Blue Black R were treated NZVI and with Pd and TiO 2 nanoparticles (Satapanajaru et al, 2011). Azo dye Congo Red treatment with NZVI was reported and the end products were demineralized with added Fenton reaction (Shih and Tso, 2012).…”

Synthesis of microsize Fe/Cu bimetallic particles using in situ acid‐mediated coating: Application on decolorization of azo dye acid orange 7

“…In the literature, it is clear that the deposition of Cu onto the surface of Fe 0 facilitates the oxidation of Fe 0 due to the high potential difference between Cu and Fe [27], which induces the release of sufficient number of electrons to generates surfaceabsorbed atomic hydrogen ([H] abs ), hydrogen peroxide (H 2 O 2 ), and hydroxyl radical (OHÁ) in solution under both anoxic and aerobic conditions, as given in Eqs. (6)(7)(8)(9)(10), resulting in improved decolorization efficiency [11,12]. Figure 3a presents the variation of decolorization efficiency (C t /C 0 ) as function of reaction time for 30 min at different ratios of TML Cu , illustrating that the decolorization performance of AO7 is highly dependent on TML Cu .…”

“…On the other hand, when the initial pH was further increased from 6.5 to 8.0, the decolorization efficiency and k obs significantly declined to 85.47% and 0.0660 min 21 (R 2 50.9922), respectively. Under alkaline condition, the hydroxyl ion (OH -) promotes precipitation, which would significantly enhance the formation of passivation layers on the surface of mFe/Cu-BPs, resulting in a decreased decolorization efficiency due to the reduced/ absence of contact rate between mFe/Cu-BPs and AO7 [10,34]. Similar phenomena were observed in the degradation of 2,4-dichlorophenol and methyl orange using Ni/Fe nanoparticles [33] and bentonite-supported nanoscale Fe/Ni bimetals [34], respectively.…”