Kinetic and thermodynamics of the removal of Zn2+ and Cu2+ from aqueous solution by sulphate and phosphate-modified Bentonite clay

Sorption of zinc by novel pH-sensitive hydrogels based on chitosan, itaconic acid and methacrylic acid

“…Since clay minerals are already known to be efficient sorbent of various pollutants [9][10][11][12][13][14][15][16][17][18], bentonite was also used for the Zn 2+ removal from aqueous solution [19,20].…”

CHAPTER 11. Natural Clays/Clay Minerals and Modified Forms for Heavy Metals Removal

“…Modification of bentonite using phosphate and sulfate anion salts has been carried out by Olu-Owolabi and Unuabonah. 99 Although the modification process causes the specific surface area of bentonite clays to decrease due to blockading of the pores, the CEC, as well as adsorption capacity towards bivalent zinc and copper ions, increased due to the presence of more binding sites introduced from the physisorbed sulfate and chemisorbed phosphate anions, in which the latter were preferentially adsorbed onto the Al-OH and Al-H 2 O surface functional groups of bentonite clay. Another efficient pathway to chemically tailoring the surface chemical nature of clays and clay minerals is through chemical conditioning.…”

Selective solid-phase extraction of uranium by salicylideneimine-functionalized hydrothermal carbon

“…A solid-phase extractant consists of two parts: a matrix and functional components. Commonly used materials for the matrix can be divided into the following groups: (i) minerals: such as clay [20,21], diatomite [16], and zeolite [22]; (ii) simple inorganic oxides: for instance, alumina [23] or silica [9,13]; (iii) polymers/copolymers: e.g. resins and related materials [12,24,25]; (iv) carbonaceous materials: for example, activated carbon (AC) [5,26], mesoporous carbon [27,28], carbon nanotubes (CNTs) [29], graphite and its derivatives [8]; (v) biomass or biosorbent: like chitosan [30] and brown alga [31]; (vi) others: hybrid materials/composites [11,32,33], gels [34,35], metal-organic frameworks [36], etc.…”