Removal of cadmium from aqueous solutions using clinoptilolite: Influence of pretreatment and regeneration

The effect of different extractants on lead desorption from a natural mineral

“…These ions should be considered as competitive in desorption-ion exchange processes (Eqs. (9), (14) and (16)), Table 2) [27]. Consequently, ion exchange of metals is favored at low pH values.…”

“…A profound understanding and a more detailed interpretation of the application of desorption is crucial for the development of new analytical procedures. Some of desorption approaches, such as acid washing with HCl, HNO 3 and H 2 SO 4 have been developed and adopted as standard methods for the pretreatment of zeolites and clays [10,14] (in order to remove surface dust and impurities) or as an activation process (to increase the specific surface area) [15][16][17]. Recently, different chemical reagents (NaCl, KCl, HCl, NaNO 3 , NaCO 3 , and NaOH) were applied for heavy metal extraction from natural minerals [14,[18][19][20][21].…”

Use of clinoptilolite for the immobilization of heavy metal ions and preparation of autoclaved building composites

“…Clinoptilolite was transformed into sodium form to increase its the efficiency in ion-exchange [2,4,24]. It was mixed with 2 M solution of NaCl, weight ratio ca.…”

Heavy metals adsorption by nanozeolites: effect of sodium hexametaphosphate

“…These types of zeolites have been used for removal of heavy metals from solutions and wastewaters. Removal of arsenic (Bilici Baskan and Pala 2011), zinc (Dimirkou 2007), copper (Doula 2007;Doula and Dimirkou 2008), lead (Erdal 2009), manganese Yavuza et al 2003), cobalt (Yavuza et al 2003, cadmium (Gedik and Imamoglu 2008;Gutiérrez-Segura et al 2012) and nickel (Rodríguez-Iznaga et al 2000;Yavuz et al 2003) from aqueous solution have been studied in several researches. Recently, using nanoparticles of zeolites has been extended due to their advantages in comparison with their microparticles (Charkhi et al 2010).…”