Carminic acid modified anion exchanger for the removal and preconcentration of Mo(VI) from wastewater

Removal of Mo(VI) from aqueous solutions using sulfuric acid-modified cinder: kinetic and thermodynamic studies

“…However, the conclusions of these studies are often contradictory. For instance, Elwakeel, Atia, and Donia (2009) and Moselhy, Sengupta, and Smith (2011) showed that Langmuir isotherm equation is well suited for modeling the sorption kinetics of Mo(VI) onto various adsorbents. In the other hand, Afkhami, Madrakian, andAmini (2009), Namasivayam andSangeetha (2006) have shown Langmuir and Freundlich models were both successful in modeling the adsorption of Mo(VI) on different adsorbents.…”

Pullulan based porous semi-IPN hydrogel: Synthesis, characterization and its application in the removal of mercury from aqueous solution

“…The porosity (%) of synthesized hydrogels was determined by using a liquid replacement method [25][26][27]. For this purpose, the dried porous hydrogel (W 1 = 0.01 g) was immersed in a graduated cylinder containing a known volume (V 1 ) of ethanol overnight until no air bubbles were seen emerging from the hydrogel.…”

“…Finally, the equilibrium amount of mercury ions was determined colorimetrically, using 1,5-diphenylcarbazide as indicator through UV-vis spectrophotometer (T80+ UV-vis Spectrophotometer, Beijing PG Instrument Co. Ltd. China) at a wavelength of 532 nm. The mercury uptake (mmol/g of porous hydrogel as an adsorbent) was calculated by the following equation [27]:…”

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

“…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.…”