In order to explore the effectiveness of potassium permanganate for real wastewater treatment, a pharmaceutical wastewater was subjected to the treatment by potassium permanganate. The effect of reaction time, dosage of potassium permanganate, solution pH and ultraviolet irradiation was investigated. The results indicated that there was an optimal reaction time and potassium permanganate dosage. The COD removal efficiency achieved the highest at pH 7.0. Ultraviolet irradiation was proved to be capable of assisting the removal of organic pollutants.

The performance of UV/TiO2 (100 mg/L TiO2) process for Orange II degrdation was emphatically compared at pH 2.3, 6.9 and 11.5 by means of UV-Visible spectra, ionic chromatography, TOC, and HPLC analyses. The results revealed that the reaction intermediates were produced in different contents with the increasing reaction time due to the different pH conditions. The dye was oxidized more completely at pH 2.3 while the highest color removal percentage was achieved at pH 11.5. It was proved that active electrons, which is photo-generated along with positive holes on TiO2, not only contribute to the discoloration and mineralization of the dye due to the producing of oxidative species such as O2•- and •OOH, but also contribute to the discoloration of Orange II as reductive species. The most possible mechanism was put forward to explain the key roles of active electrons in dye degradation by UV/TiO2 process at pH 2.3 and 11.5.

In the title compound, {[Tb(C(12)H(8)NO(2))(3)(H(2)O)(2)]·H(2)O}(n), the Tb(III) cation is in an eight-coordinate environment, ligated by six carboxylate O atoms from five 3-(pyridin-4-yl)benzoate (L) ligands and by two O atoms from water molecules. The cations are bridged by the carboxylate O atoms of the L ligands to form a two-stranded polymeric chain which is assembled into a three-dimensional supramolecular network through regular interchain O-H···N hydrogen bonding. On excitation at 320 nm, the title compound displays a series of emissions, which were assigned to the characteristic electronic transitions of Tb(III).