Adsorption/Desorption of Hg(II) on FDU-1 Silica and FDU-1 Silica Modified with Humic Acid

Inorganic nano-adsorbents for the removal of heavy metals and arsenic: a review

“…148 With that being said, the larger the ionic radius, the less likely it will remain solvated to compete with the silanols. 149 Zeta potential measurements were performed as a function of pH and the PEIsilica nanospheres had an isoelectric point around 8 due to the presence of a protonated amino group of the polymer. 148 Sorption isotherms were calculated to study the behavior of adsorption.…”

“…The nanomaterials demonstrated success for sorption of heavy metals and PAHs through electrostatic interactions and the formation of a charge transfer complex between the PAH and tertiary amino groups. 149 More tests are needed to implement these in wastewater treatment. No regenerative studies were mentioned.…”

Template-free Synthesis of Mesoporous Silica with High Specific Surface Area from Natural Halloysite and Its Application in Methylene Blue Adsorption

“…In order to further improve SSA, Shu, et al [10] introduced a short-term NaOH treat-ment on the pre-calcined halloysite, and then etched it with acid, producing mesoporous silica nanotubes with SSA as high as 608 m 2 /g. Nevertheless, the SSA is still limited compared to those of the mesoporous silica fabricated by the traditional template methods (700 m 2 /g-1000 m 2 /g) for FDU-1 [11] , SBA-15 [12] , KIT-6 [13] . Thus, it is still of urgency to develop new processes for preparing halloysite-derived mesoporous silica with further improved SSA.…”