Structural characterisation of Arquad® 2HT-75 organobentonites: Surface charge characteristics and environmental application

► Arquad® 2HT-75 is comparatively less toxic and inexpensive surfactant. ► Increasing Arquad® 2HT-75 loadings give rise to various organobentonite structures. ► The organobentonites produce positive zeta potential at TOC contents above 28.1%. ► Zeta potential values decrease with increasing suspension pH. ► Multiple mechanisms of partitioning, physio-sorption and chemisorption control adsorption.