Adsorption behavior of mercury over hydrated lime: Experimental investigation and adsorption process characteristic study

Calcium hydroxide recycled from waste eggshell resources for the effective recovery of fluoride from wastewater

“…Among them, the sharp peak at 3633 cm −1 and the broad peak at 3440 cm −1 are attributed to the bending vibrations of –OH from Ca(OH) 2 and crystalline hydrate, respectively. 31,32 A higher relative intensity peak at 3633 cm −1 can be found in the aged samples but not in calcined samples at 800 or 900 °C, which is in agreement with the XRD result that more Ca(OH) 2 is generated by aging treatment. The peaks at 1411 and 1050 cm −1 and the peaks at 709 and 2513 cm −1 in ES800 and AES800 belong to the vibrations of C–O bonds.…”

“…33 Moreover, the peaks at 2976, 2859, and 1791 cm −1 are attributed to the C]O bonds from CO 3 2− , and the abovementioned bands indicate the presence of CaCO 3 in ES800 and AES800. 31 However, the peaks belonging to CaCO 3 are not found in the sample calcined 900 C, which could be explained by a lower relative peak intensity. Moreover, the sharp bands at 871 cm −1 correspond to the Ca-O bond, and the broad peaks at 498 cm −1 are from the Ca]O bonds.…”

Post-synthetic thiol modification of covalent organic frameworks for mercury(II) removal from water

“…Among the numerous techniques for this purpose, adsorption is a promising method to address this environmental challenge [ 6 , 7 ]. However, the application of conventional adsorbents such as activated carbon [ 8 ], clay [ 9 ], hydrated lime [ 10 ], and biosorbents [ 11 ] is limited because they have low Hg(II) adsorption capacities and selectivity. Therefore, suitable adsorbents need to be developed with fast kinetics, high adsorption capacities, and excellent selectivity for effective removal of Hg(II) from aqueous solutions.…”

Dye contaminated wastewater treatment through metal–organic framework (MOF) based materials

“…19 A recent study shows that ease of use and great efficiency make adsorption one of the most effective advanced wastewater treatments for removing dangerous inorganic and organic contaminants from effluents. 20,21 Dye removal through the adsorption process using activated carbon, 22 nanoporous silica, 23 clay materials, 24 and biomaterials 25 has proven to be the most simple and economical method. But this conventional method faces the problem of formation of a large amount of residue and poor selectivity of adsorbents.…”