To avoid deficiencies of traditional electrocoagulation process, electrocoagulation process powered by renewable photovoltaic energy has been directly employed to remove Ni from wastewater. Results show that under the solar irradiation intensity (SII) of 750 - 30 W/sq m, Al electrode has higher Ni removal efficiency (NRE) than graphite and Ti and its NRE was almost 100% in 40 min. An optimum distance of 20 mm was determined for the electrode gap. NRE in 40 min almost decreased from 99.6% to 78.8% when initial Ni2+ concentration increased from 100 to 300 mg/L. Under the SII of 610 - 40 W/sq m, ...
