Cathodic photoprocesses on titania films and in aqueous suspensions

Simultaneous removal of metal ions and linear alkylbenzene sulfonate by combined electrochemical and photocatalytic process

“…Concentrations of Zn ++ and Ni ++ decreased by 15% and 8%, respectively, in the first hour and leveled off thereafter. This is in line with reported literature where a 16% removal of Zn ++ was attributed to adsorption on TiO 2 surface [22]. Also, it has been reported that Zn ++ adsorption increased in the presence of organic compounds [23].…”

A surface science perspective on TiO2 photocatalysis

“…Examples of metal cation systems examined in the literature include: Ag + [524,525,[1105][1106][1107][1108][1109][1110][1111][1112][1113][1114][1115][1116][1117][1118]; Au 3+ [1117,[1119][1120][1121]; Cd 2+ [1122][1123][1124]; Cr 6+ [233,1119,[1125][1126][1127][1128][1129][1130][1131][1132][1133][1134][1135][1136][1137][1138][1139][1140]; Cu 2+ [1119,1125,1128,1130,1135,[1141][1142][1143]…”

“…Numerous groups have also shown that these potentials can be shifted (to increase or decrease activity) by pH, by electrolyte concentration or by coadsorbates. Kabra and coworkers [1125,1141,1142] The boundary region between active and inactive metal cations in the assessment of Rajeshwar et al [1119] is the TiO 2 CB minimum position. However, potential energy can be lost due to electron trapping (see Section 2.4), which places an additional limitation on the reductive power of TiO 2 .…”

Kinetic and equilibrium investigation of Cu(II) removal by Co(II)-doped iron oxide nanoparticle-immobilized in PVA–alginate recyclable adsorbent under dark and photo condition

“…In order to balance the charges, the electron on the semiconductor would initiate the electrostatic attraction to draw all the positive cations in the solution to it surface, which cause simultaneous adsorption of Cu(II) and H + formed after the degradation of organic scavengers [45,52]. According to Rajeshwar et al [53], after the adsorption process, whether the sorbent would be chosen to be reduced or not was very much dependent on its standard reduction potential. The more positive the standard reduction potential, the easier would be for the sorbent to be reduced.…”