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Thermodynamics experiments. Concentrations of exogenous chromium solution (Cr6 +) were 10, 25, 50, 100, 150, 200, 250 mg/L, respectively. 45-µm polytetrafluoroethylene membrane filter, and finally the content of Cr in residual solutions after adsorption was analyzed by Atomic Absorption Spectrophotometer (AAS). 1mol/L) into 100 ml centrifugal tube respectively, the assay conditions of oscillation, sustain, centrifuge , measure methods were as same as adsorption test. Each sample was analyzed three times and the resulting average value was adopted.
Non water-soluble porphyrins were used in this research. In order to improve the solubility of porphyrins, Tween-80 as a proper surfactant was introduced. Different volumes of surfactants have different influence on the interaction between porphyrins and metal ions. 3. 6 ml, the absorbance reached to maximum. 6 ml. 24 Contaminated Sites Remediation Fig. 3. The effection of surface to the absorbance Absorption spectra. 4. 7nm, resepectively. Comparing to TPP, it was not difficult to find that the Soret peak were redshifted and the width of peak amplified by different amounts, which were positive correlated with the number of hydroxyl groups on porphyrin ring.
Resources, conservation and recycling, 52 (2008) 843-858. 44 Contaminated Sites Remediation . , Extended producer responsibility: a tool for achieving sustainable development. J Land Use Environ Law, 19(2004) 503–23. . , Comparative analysis of EPR programmes for small consumer batteries: case study of the Netherlands, Switzerland and Sweden. IIIEE Report 2002: 9. The international institute for industrial environmental economics, IIIEE, Lund University. 2002. . Hainault T, Smith DS.