Coexistence of adsorption and coagulation processes of both arsenate and NOM from contaminated groundwater by nanocrystallined Mg/Al layered double hydroxides

Extremely high arsenic removal capacity for mesoporous aluminium magnesium oxide composites

“…However, after adsorption of AsIJV) at pH 3 or adsorption of AsIJIII) at pH 7, the Al/Mg ratio in the meso-80Al20Mg-400 was changed to 9.3 and 9.9 respectively, indicating the leaching of Mg from the surface (some in situ formed MgIJOH) 2 dissolved) during the adsorption process, similar to the observation in the reported MgAl layered double hydroxides. 66 Two research groups revealed the interaction of arsenate/ arsenite with commercial bulky AlIJOH) 3 and MgO, respectively, by using extended X-ray adsorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) techniques. 48,60 AsIJV) was bound to AlIJOH) 3 by bidentate binucleate As-O-Al bonding.…”

Enhanced removal for humic-acid (HA) and coagulation process using carbon nanotubes (CNTs)/polyalumium chloride (PACl) composites coagulants

“…In view of decreasing cost, the coagulation process using coagulants which had larger removal efficiency would be a very widely used method for the removal of HA molecules. There are many materials which could be used for the adsorption of HA [22][23][24][25]. Carbon nanotubes (CNTs) are relatively new adsorbents that have been proven to possess great potential in removing many kinds of pollutants such as organic matter from aqueous solutions [26][27][28].…”

Adsorption of arsenate on lanthanum-impregnated activated alumina: In situ ATR-FTIR and two-dimensional correlation analysis study

“…The World Health Organization (WHO) and the U.S. Environmental Protection Agency (EPA) have successively proposed a more restricted guideline for As in drinking water from 50 mg/L to 10 mg/L [3]. Thus, new technologies and materials for efficient removal of As from water are urgently demanded.…”