Spectroscopic and electric properties of C.I. Mordant Blue 29: a theoretical and experimental study

Zerzucha, Piotr; Pytlakowska, Katarzyna; Kocot, Karina

doi:10.1039/c3nj00505d

Cited by 2 publications

(2 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, it is likely attributable to electrostatic interaction or complex formation between CAS and clay mineral surfaces at those pH values, as has been noted previously between anionic azo dyes and HNTs [14]. Interestingly, highly acidic CAS solutions (dominating species H 5 L + , Scheme 1) [56] and CAS-aluminum complexes [69][70][71] have adsorption maxima at ~544-546 nm. Thus, it can be postulated that the supernatant samples contained residual CAS-clay colloidal particles at pH 6-6.5, and the complex formation between CAS and aluminum was sufficiently intense to become visible in the UV spectra.…”

Section: Effect Of Ph On the Combined Dye Removal Processmentioning

confidence: 77%

See 1 more Smart Citation

Efficient entrapment and separation of anionic pollutants from aqueous solutions by sequential combination of cellulose nanofibrils and halloysite nanotubes

Selkälä

Suopajärvi

Sirviö

et al. 2019

Chemical Engineering Journal

View full text Add to dashboard Cite

The synergistic combination of different nanomaterials for improved performance in environmental applications such as the removal of aqueous micropollutants has attracted increasing interest in recent years. This study demonstrates a novel sequential adsorptionaggregation concept that harnesses tubular halloysite nanotubes (HNTs) and flexible cellulose nanofibrils (CNFs) for the removal of a small, anionic dye molecule, chrome azurol S, from water. Hollow HNTs were first allowed to interact with the aqueous dye solution, after which the dye-loaded colloidal nanotubes were aggregated and separated from the water phase with cationized CNFs. The combination of 25 mg CNFs with 1 g HNTs at pH 7 resulted in efficient removal of dye (80%) and turbidity (~100%) and the removal of dye was further promoted in 2 more acidic conditions (within the pH range of 6-8.5) because of the attractive electrostatic interactions. Cationic CNFs not only enabled the separation of dye-loaded clay particles from the water phase through a rapid aggregation but also participated in dye removal through adsorption (~20%). In comparison with nano-sized HNTs, the dye removal performance of micro-sized and chemically similar kaolin was poor (43%). Given the good availability of both HNTs and CNFs and the low consumption of the more expensive component (i.e., CNFs) in the process, the concept is straightforward, readily applicable, environmentally benign, and potentially costeffective.

show abstract

Section: Effect Of Ph On the Combined Dye Removal Processmentioning

confidence: 77%

“…Scheme 1. The structure of chrome azurol S, its dissociation species, and the corresponding colors [56]. The highlighted species HL 3− corresponds to the presented chemical structure.…”

Section: Raw Materials and Chemicalsmentioning

confidence: 99%