Selective removal of Au(III) from wastewater by pyridine-modified chitosan

High value-added utilization of secondary aluminum ash & carbide slag: preparation of a high-performance adsorbent for rapid removal of fluoride from wastewater

“…It is obvious that all the samples exhibit typical IV isotherms and H1 hysteresis loops (Fig. 2a-d), conforming to IUPAC classification, 33 thus indicating a homogeneous mesoporous structure of the materials. The appearance of an H1 hysteresis loop may result from crystallization of a substance that modulates the channel.…”

Natural and Synthetic Polymers Modified with Acid Blue 113 for Removal of Cr3+, Zn2+ and Mn2+

“…In order to obtain a huge selectivity for metal ions (M X+ ) removal new chelate materials have been developed [ 1 , 2 ]. In this, natural and synthetic polymers have proven to be able in preconcentrating and separating M X+ [ 3 , 4 ]. Therefore, they contained functional groups that strongly interacted with M X+ establishing complex combinations.…”

A pyridinium-modified chitosan-based adsorbent for arsenic removal via a coagulation-like methodology

“…One such example was reported by Chen et al, where a pyridinium-moiety was graed onto the amine-group of chitosan via a linker unit. 29 However, a more direct approach is the conversion of the amine group into a pyridinium chloride moiety, according to the well-known Zincke reaction, which has been utilized to obtain such chitosan derivatives. 30,31 The Zincke reaction is envisaged to require a lower temperature and shortening of the reaction time to yield a cationic form with variable hydration properties via a lower energy synthesis (cf.…”