Variation in performance of surfactant loading and resulting nitrate removal among four selected natural zeolites

Fluoride Sorption Efficiency of Vermiculite Functionalised with Cationic Surfactant: Isotherm and Kinetics

“…The same mechanism was discovered in other anionic adsorption studies such as Senturk et al [22], Kumar et al [54], Onyango et al [20], Yu et al [17], Wang et al [28], Asgari et al [26], Aroke et al [19], and Slimani et al [29], amongst others. The formation of a positively charged bilayer on the clay surface was responsible for fluoride attraction [26,55]. Further study by Haggerty [56] also confirms this fact, as it states emphatically that sorption onto positively charged admicelle formation is a major mechanism for anionic component removal by an organomodified adsorbent.…”

Removal of nitrate from aqueous solution using cetylpyridinium bromide (CPB) modified zeolite as adsorbent

“…Schick et al [15] reported that the maximum adsorption capacity for nitrate on surfactant HTAB modified Bulgaria zeolite derived from the Langmuir isotherm model was found to be 87 mmol/kg. Guan et al [16] investigated the nitrate removal performance of USA, Croatia, China and Australia zeolites modified by surfactant HTAB and found that the maximum adsorption capacities derived from the Langmuir isotherm model for these SMZs were 56, 45, 24 and 24 mmol/kg, respectively. It was evident that the maximum monolayer nitrate adsorption capacity of CPB modified zeolite was higher than that of HTAB modified zeolite reported in previous literatures.…”

“…In recent years, different studies on the performance of HTAB modified zeolites in removing different oxyanions such as chromate [8,10], arsenate [9], antimonate [12] and phosphate [13] have been conducted. Some investigations on nitrate adsorption onto HTAB modified zeolites have also been conducted [14][15][16]. However, to our knowledge, the adsorption of nitrate on CPB modified zeolite has not been investigated previously.…”

Batch adsorptive removal of benzoic acid from aqueous solution onto modified natural vermiculite: Kinetic, isotherm and thermodynamic studies

“…As it has been reported in the literature [25][26][27][28][29], employing cationic surfactants with concentrations higher than the critical micelle concentration (CMC) results in forming a so-called patchy bilayer of the surfactants with outward pointing head groups on the solid surface. As shown schematically in Fig.…”