Mercury removal from aqueous solutions of HgCl2 by heterogeneous photocatalysis with TiO2

Mercury Removal from Aqueous Solution by Mixed Mineral Systems I. Reactivity and Removal Kinetics

“…For successful treatment of water containing mercury using mineral systems, a full understanding of the reactivity and the kinetic reaction partners to the reactive sites of mercury sorbents is required [13][14].The removal of mercury from aquatic systems is controlled by the speciation, mobility, ionic size of the sorbing ions, sorbate composition, sorbent solubility, sorbent particle size, sorbent surface charge, surface area of the mineral sorbent, solution dilution and H+/ − M exchange stoichiometry [15][16].…”

Surface-Modified Photocatalysts

“…In the removal of cations from solution, the system pH controls the speciation in solution and the interfacial electron transfer. The photocatalytic removal of Hg(II) from aqueous solutions of HgCl 2 using TiO 2 as catalyst showed that the overall process strongly depended on pH, being enhanced as the pH was increased [46]. At pH 10, an efficient removal of Hg(II) was achieved even in the absence of organic additives, attaining final mercury concentrations in solution at trace levels (μg L À1 ).…”

Integrating photochemical vapor generation with photo-oxidation trapping for effective mercury removal from polluted water and its on-line monitoring

“…Moreover, a large amount of mercury-containing sludge is produced, which may be more danger to the environment and the human being. To overcome these drawbacks, photocatalytic reduction using a nano-catalyst or ultrasound-promoted reduction of inorganic mercury to mercury vapor (Hg 0 ) for its removal has been reported [25,26]. These methods not only used relatively expensive nanomaterials but also direct release Hg 0 and possibly the nano-catalyst to the atmosphere and the environmental water.…”