In this paper, a TiO 2 /Ru-IrO 2 bifacial electrode constituted of TiO 2 nanotubes and Ru-IrO 2 coating was prepared and used for the degradation of 2,4-dichlorophenol (2,4-DCP) under UV light irradiation. The TiO 2 /Ru-IrO 2 bifacial electrode exhibited a synergetic effect on the degradation of 2,4-DCP with the pseudo-first-order rate constant of 0.1664 min −1 , which was 3.6 and 5.7 times higher than that of TiO 2 electrode and Ru-IrO 2 electrode, respectively. Influencing factors on the degradation of 2,4-DCP were investigated and the removal of 2,4-DCP was favored at basic condition, higher cell voltage, NaCl concentration and ion strength. In addition, the bifacial electrode also exhibited high efficiency for the photoelectrocatalytic treatment of landfill leachate and 59% of COD was removed with initial COD of 850 mg/L. The bifacial electrode exhibited good stability and showed the promising potential for practical treatment of wastewater.
Zhihong Yin,Liandong Zhu,Fan Mo,Shuangxi Li,Dan Hu,Ruoyu Chu,Chenchen Liu,Chaozhen Hu
Cu (II) is one of the most harmful heavy metals in the environment, due to the hazardous effects to aquatic organisms, plants, animals, and human beings. In this work, a novel modified magnetic biochar (MBC@APTES-PAMAM) was prepared by PAMAM dendrimer for the removal of Cu (II). The analysis of structural properties identically demonstrated that the abundant -NH 2 groups were successfully loaded onto magnetic biochar surfaces. The sorption kinetics process of Cu (II) onto MBC@APTES-PAMAM was better fitted by the pseudo-second-order model. Langmuir isotherm model was better described for Cu (II) sorption process. MBC@APTES-PAMAM showed outstanding performances on Cu (II) removal, and the maximal adsorption amount was 251.81 mg/g. Adsorption experiment indicated that MBC@APTES-PAMAM had a higher Cu (II) removal efficiency under the pH range from 2 to 8. The adsorption capacity of Cu (II) onto MBC@APTES-PAMAM was decreased in the presence of competing ions. The existence of surfactant and humic acid had great influences on Cu (II) adsorption process. The Cu (II) adsorption mechanism was connected to the -NH 2 by complexation reaction, due to the increased electrostatic attraction and bridging influences. In addition, MBC@APTES-PAMAM also exhibited comparable removal performances for COD (70.82%), TN (71.10%), TP (100%), NH 3 N (55.03%) and Cu (II) (99.68%) in the practical treatment of landfill leachate. Overall, MBC@APTES-PAMAM is a green, low-cost, and high efficiency adsorbent for Cu (II) removal.
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