Titanium dioxide, as environmental (decontamination) photocatalyst, is increasingly gaining importance in the removal of organic pollutants from water and air, as well. Different methods can be used for obtaining TiO 2 catalyst, but sol-gel and hydrothermal methods are most commonly used for the synthesis and modification of TiO 2. The properties of nanostructured materials such as crystal phase, surface features and electronic structures can be changed with doping. In this paper, the influence of Fe and Zn as dopants on the physico-chemical properties of TiO 2 catalyst will be presented based on the reported literature data. Usually applied instrumental techniques for the materials characterizations are X-ray diffraction (XRD), SEM, TEM, FTIR and UV-vis spectroscopy. The removal efficiency of various organic pollutants (organic dyes, antibiotics, pesticides, xenobiotics) is determined by the characteristics and dosage of the catalyst, nature and initial concentration of pollutants, pH, oxidants addition, light intensity and wavelength.

A method for glucose determination with glucose oxidase is proposed in which the redox catalyst Na-molybdate-KI replaces peroxidase. Whole blood (100 μΐ) may be used after deproteinization; serum or plasma (10 μΐ) can be analyzed directly. The color is stable for at least 30 minutes after stopping the reaction. Es wird eine Methode zur Bestimmung von Glucose mit Glucoseoxidase vorgeschlagen, bei der der Redoxkatalysator Na-Molybdat/KI Peroxidase ersetzt. Vollblut (100 μΐ) wird nach Enteiwei ung, Serum bzw. Plasma (10 μΐ) direkt analysiert. Der gebildete Farbstoff ist nach Abstoppen der Reaktion mindestens 30 Minuten stabil.

The TiO 2 /carbonized materials in composites provide a synergistic effect of adsorption and photocatalysis. The activated carbon or carbonized material can be prepared using various raw materials that present agricultural waste. The most commonly used process for the preparation of the activated carbon (AC)/carbonized material is chemical activation. Chemical activation produces the activated carbon with a good surface area and pore system, which contributes to better adsorption of organic pollutants. The TiO 2 /AC composite materials can be prepared by sol-gel, hydrothermal and metal organic chemical vapor deposition (MOCVD) techniques. The most commonly used techniques for characterization of the TiO 2 /AC materials are XRD, BET, TG Analysis and UV-Vis DRS, and will therefore be discussed in this paper. The TiO 2 /AC composite materials have shown significant efficiency in removal of organic pollutants from aqueous solutions. The adsorption process of organic pollutants can be affected by various process parameters that will be observed in this paper.