8 research outputs found
Adsorption of Cd, Cu, Ni and Zn in tropical soils under competitive and non-competitive systems
Prediction of chromatographic retention of metal complexes from stability constants measured by ion chromatography
Sorption behavior of heavy metal pollutants onto shales and correlation with shale geochemistry
Seawater zinc/polypyrrole-air cell possessing multifunctional charge-discharge characteristics
An environmentally friendly cell using polypyrrole-air regenerative cathode and zinc as anode is investigated in the 3% sodium chloride solution. The cell can operate in different charge and discharge mode. Polypyrrole can be reoxidized (doped) with chloride anions either by using dissolved oxygen or by an external power supply, e.g., small photovoltaic cell. In that way, after discharge, capacity retaining can be achieved by using seawater as the electrolyte. During low discharge rate, the delicate balance between solid state diffusion-controlled dedoping and chemical oxidation of polypyrrole produced by hydrogen peroxide is achieved, generating stable voltage plateau. The cell is proposed to operate as a power supply for different sensor devices in two modes. In the low discharge mode (10-20 mA g(-1)), it can be used for data acquisition, and at the fast discharge mode (up to 2 A g(-1)) for collecting data transmission