Advances in Chemical Engineering: Photocatalytic by Hugo I. De Lasa

By Hugo I. De Lasa

The cross-fertilization of physico-chemical and mathematical principles has an extended ancient culture. This quantity of Advances in Chemical Engineering is nearly thoroughly devoted to a convention on 'Mathematics in Chemical Kinetics and Engineering' (MaCKiE-2007), which was once held in Houston in February 2007, bringing jointly approximately forty mathematicians, chemists, and chemical engineers from 10 international locations to debate the appliance and improvement of mathematical instruments of their respective fields.

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Removal of mercuric species in aqueous solutions is difficult because they are hard to be bio- or chemically degraded. , 2002). , 2002). Mercury transformation by heterogeneous photocatalysis with semiconductors (including electrodes, micro- and nanoparticles) such as ZnO, TiO2, WO3 under UV, visible irradiation, and even solar light has been reported in a series of papers. , 2002; 50 Marta I. , 2004). It was concluded that the removal efficiency depends strongly on pH, that the reaction is inhibited by oxygen and that there is an enhancement by organic donors.

However, it is not possible to distinguish between simultaneous or consecutive steps. In closing, important advances have been performed after 1999 on Hg(II) photocatalysis, especially concerning the highly toxic organomercuric compounds. , 2002), it is worthwhile to remark that remediation of Hg(II) in aqueous solutions is hard to attain completely, because of the low levels needed to avoid toxicity (in the order of mg LÀ1). Thus, very sensitive analytical tools must be used to control the concentration of species in the solution.

CO2 þ H2 O ð29Þ It is also possible to consider a simultaneous Hg(II) reduction and oxidation of the organic moiety, taking place on the initial organomercurial. However, it is not possible to distinguish between simultaneous or consecutive steps. In closing, important advances have been performed after 1999 on Hg(II) photocatalysis, especially concerning the highly toxic organomercuric compounds. , 2002), it is worthwhile to remark that remediation of Hg(II) in aqueous solutions is hard to attain completely, because of the low levels needed to avoid toxicity (in the order of mg LÀ1).

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