A hybrid yellow nanopigment as an environmentally sound alternative to lead chromate pigment for pavement markings. (15th October 2021)

• Record Type: Journal Article
• Authors: Mahmoodi, Ali; Jiryaei, Zahra; Dadras, Ayda; Khorasani, Manouchehr; Shi, Xianming
• Is Part Of: Journal of cleaner production. Volume 319(2021)
• Publication Date: 2021-10-15
• Subjects: Hybrid nanopigment -- Montmorillonite -- Organoclay -- Lead chromate -- Cytotoxicity -- Pavement marking; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2021.128733
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: This study entails the synthesis of a series of yellow hybrid dye-clay nanopigments (DCNPs) using different yellow cationic dyes, natural, and organomodified montmorillonite. The cationic exchange reaction served as a facile, one-pot, and low-temperature transformation strategy. DCNPs are explored as a type of lead-free eco-friendly pigment to substitute for conventional lead chromate pigment (PbCrO4 ) for pavement markings. The plate-like DCNP stacks with an approximate hydrodynamic diameter of 2.1 μm were well-dispersed in paint film, forming partially intercalated/exfoliated structure. DCNPs exhibited higher thermal stability, weathering stability, and chemical stability than PbCrO4 . DCNPs featured the brilliant yellow shade in pavement marking paint, with the blue-yellow component value (b*) up to 69.9 units. The American pavement marking reference colors can be achieved with a considerably smaller amount of colorant when using DCNP, owing to its exceptional color strength. The cytotoxicity analysis revealed 91%, 66%, and 2% viability of fibroblast cells after a 48h treatment with 0.25 mg/ml natural DCNP, organoclay-based DCNP, and PbCrO4, respectively. In conclusion, the remarkable functional properties and low acute toxicity of the resulting nanopigments suggested the potential application of DCNP as a promising alternative to lead-based pigments in pavement markings. Highlights: A series of hybrid yellow nanopigments (DCNPs) were synthesized. The preparation process was simple, low-temperature, and environmentally friendly. DCNPs showed excellent thermal, chemical, and weathering stability. DCNPs showed a low acute cytotoxicity effect on fibroblast human cells.