Enhanced removal of p-nitrophenol from aqueous media by montmorillonite clay modified with a cationic surfactant

Organophilic bentonites obtained by microwave heating as adsorbents for anionic dyes

“…The percentages of total mass losses between 298-1200 K were higher for organobentonites than pristine bentonite. The first mass loss associated with the desorption of interlayer water was lower for the organobentonites (<1%) than the pristine sample, which was attributed to the hydrophilic character of the samples after the organofunctionalization (Moslemizadeh et al, 2016;Santos et al, 2018). The thermal elimination of alkyl surfactants proceeded at temperatures above 473 K. The second, third, fourth and fifth events in the TG curves of the hybrids were attributed to loss of the surfactant moieties and are in agreement with the literature (Park et al, 2011;Zhu et al, 2012;Taleb et al, 2018).…”

“…This fact was associated with the different interactions between the surfactants and bentonite as the concentration of organic moieties increased (Teppen and Aggarwal, 2007;Park et al, 2011;Taleb et al, 2018). The last mass loss for all hybrids (~2.0%, above 799 K) was attributed to the dehydroxylation of the solid Santos et al, 2018).…”

“…The first mass loss (2.3%) for pristine bentonite between 298-383 K was attributed to the desorption of external and interlayer water (Park et al, 2011;Ma et al, 2015;Santos et al, 2018) and the second loss of 5% between 560 -1126 K was associated with the dehydroxylation of bentonite. The percentages of total mass losses between 298-1200 K were higher for organobentonites than pristine bentonite.…”

“…groups(Ouellet-Plamondon et al, 2014; Acisli et al, 2017;Martinez-Costa et al, 2017;Santos et al, 2018) and suggest the presence of the ammonium moieties on the bentonite(Acisli et al, 2017).For all of the hybrids, both C-H stretching bands were sharp and intense without alterations in the wavenumbers. Other new bands were observed at 1475 cm -1 and 725 cm -1 and were assigned to the scissoring and rocking bending of CH 2 , respectively(Ouellet-Plamondon et al, 2014;Martinez-Costa et al, 2017;Lazorenko et al, 2018;Santos et al, 2018). The CH 2 scissoring band normally overlaps with the CH 3 antisymmetrical bending band, which occurs in the same region(Lin-Vien et al 1995).…”

Usage Potential of Sawdust as a Forest Industry Waste For Treatment of Colored Effluents

“…The biosorption capacity decreased with increasing amount of biosorbent. The reduction in the dye removal potential of biosorbent could be attributed to the unsaturation of biosorption sites and/or the particle aggregation of biosorbent [1,7].…”