Removal of chromium ion (III) from aqueous solution by manganese oxide and microemulsion modified diatomite

Turning the volume down on heavy metals using tuned diatomite. A review of diatomite and modified diatomite for the extraction of heavy metals from water

“…Thus Li et al [17] used two types of modified diatomites (by microemulsion and manganese oxide). The chemical composition of the unmodified material, determined by X-ray fluorescence gave the following percentages: SiO 2 , 71.…”

Polyethyleneimine functionalized mesoporous diatomite particles for selective copper recovery from aqueous media

“…To date, there have been a number of studies of DE material-based adsorption of Cu and other heavy metals (e.g., nickel, mercury, chromium) from aqueous media [17,[21][22][23][24][25][26][27][28][29][30]34]. Another recent study has also reported on the removal of Cu(II) from synthetic electroplating rinse water by using PEI impregnated ion-exchange resin [35].…”

“…), their abundance in nature and low cost are most desirable. These essential characteristics have also led to the current, rapidly growing interest in its application to water purification [17,[21][22][23][24]. For instance, the adsorption behaviour of heavy metal ions (e.g., Ni(II), Pb(II), Cu(II), Cd(II) and Th(IV)) and organic contaminants onto pristine and modified DE particles from aqueous solutions under different conditions (e.g., pH and temperature), have been investigated [25][26][27][28][29][30].…”

Manganese oxide incorporated ferric oxide nanocomposites (MIFN): A novel adsorbent for effective removal of Cr(VI) from contaminated water

“…Almost identical range of G 0 values for adsorption of Cr(VI) on different adsorbents were reported by other researchers. The values of G 0 for binding of Cr(VI) were reported as −0.44 KJ mol −1 at 303 K with bentonite [70], −3.72 to −4.81 KJ mol −1 with Al 2 O 3 [71,72], −6.26 to −8.96 KJ mol −1 at 293-323 K with Al-Mg mixed metal oxides [73,74] even though much higher magnitude of G 0 (−40 KJ mol −1 ) was observed for modified clay materials [56]. Higher the negative values of G 0 (−30 to −40 KJ mol −1 ), higher would be the possibility of binding Cr(VI) with the active sites of adsorbents through hydrogen bonding and subsequently, chemisorption would be favored to some extent [75].…”