JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Li-Zhi Huang,Junpeng Li,Weiguo Chen,Jia Deng,Fang Zhang
Ni organic complexes are widely used in industrial production, posing severe threats to the natural environment and human health. In this work, we found that Ni (0) formed by the decomplexation and reduction of typical Ni organic complexes (Ni-EDTA) on the surface of carbon felt cathode. The formed Ni(0) as a catalytic site generates atomic hydrogen (H•) with strong reductive reactivity via electron transfer. H• not only accelerates the oxygen activation to form H 2 O 2 on carbon felt cathode, but also reacts with H 2 O 2 to generate strong oxidative hydroxyl radicals (HO•) and singlet oxygen ( 1 O 2 ). Under the attack of multiple active species, 95.5 % of Ni-EDTA is removed, and the removal efficiencies of total organic carbon (TOC) and dissolved Ni reach 43.8 % and 77.1 % after 120 min of electrolysis at −2.0 V (vs. Ag/AgCl). The redox synergistic reaction, initiated by the formation of Ni(0) on the carbon felt cathode, demonstrates excellent stability in treating real Ni plating wastewater. This approach eliminates the need for additional chemical reagents and prevents the release of heavy metals. Our findings offer a novel strategy for leveraging the self-transformation of Ni organic complexes to generate various active species for electrochemical treatment of Ni plating wastewater.
研究领域:
环境科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Song Chen,Lin Tang,Haopeng Feng,Yaoyu Zhou,Guangming Zeng,Yue Lu,Jiangfang Yu,Xiaoya Ren,Bo Peng,Xiaocheng Liu
The adsorbability on the carbonaceous cathode plays an important role in electro-Fenton systems but does not obtain enough attention. In this work, various carbon felts were obtained with different adsorption property by using the method of KOH activation at different temperatures to explore the influence of adsorption on the degradation efficiency of tetracycline (TC). The results of morphology characterization, nitrogen adsorption-desorption tests, XPS and FTIR analysis revealed that the surface area of carbon felt was improved, and the oxygen-containing functional groups on the surface were increased via KOH method with significantly enhanced adsorption capacity. In the batch experiment of TC electro-Fenton degradation, the carbon felt with better adsorption capacity tended to get higher degradation and mineralization efficiency. With the KOH activation process, CF-900 (carbon felt at 900 °C for 1 h) exhibited the best TC adsorption property for the removal of TC within 30 min (initial concentration: 80 mg/L). Meanwhile, the constant of reaction rate for TC degradation at the CF-900 is 0.0648 min −1 . It is higher than that (0.012 min −1 ) obtained at the raw carbon felt (∼5 times of enhancement). There are also synergistic effects between adsorption and degradation performance on some other organic pollutants. In addition, the degradation pathway was also studied by the methods of solid-phase extraction and high performance liquid chromatography-mass spectrometry (HPLC). From the obtained results, it is shown that good adsorbability is favorable for degradation in the homogeneous electro-Fenton system.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yujiao Long,Hongna Li,Xuan Xing,Jinren Ni
This study presented a significant enhanced removal of Microcystis aeruginosa by simple addition of Fe 2+ at circumneutral pH in the electrochemical system with boron-doped diamond (BDD) anode and carbon felt (CF) cathode. Results showed that over 99.9% of the M. aeruginosa cells were removed in 60 min when 0.2 mM Fe 2+ was added to the system. The pseudo-first order rate constant for BDD-CF-Fe 2+ system was almost 15 times higher than that (0.005 min −1 ) for BDD-CF system. The excellent performance of the BDD-CF-Fe 2+ system over the BDD-CF system was observed over a wide range of pH from 3 to 9. Based on the evolution of Fe 2+ /Fe 3+ , pH, H 2 O 2 and OH, mechanism of enhanced removal of M. aeruginosa was revealed in the BDD-CF-Fe 2+ system. H 2 O 2 was electrochemically generated through reduction of dissolved oxygen on the surface of the CF cathode, and the added Fe 2+ was rapidly adsorbed and precipitated also on the CF cathode. Comparisons of BDD-CF-Fe 2+ , BDD-CF-Fe 3+ and BDD-CF-Fe 2+ /Fe 3+ systems proved that the electrochemical reduction of Fe(III) to Fe(II) could guarantee the sustainable cycle between Fe(II) and Fe(III). Through heterogeneous electro-Fenton reactions, much higher amount of OH would be continuously generated compared with the BDD-CF system. Thereby, the lipid peroxidation on the cell membrane of M. aeruginosa was intensified through the addition of Fe 2+ . Moreover, the degradation of intracellular microcystin was remarkably accelerated, and the extracellular microcystin was controlled more safely due to Fe 2+ addition. This study provided an alternative method to enhance the electrochemical mitigation of cyanobacteria-polluted waters.
研究领域:
环境科学
·
微生物学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Nguyen Trung Dung,Le Thuy Duong,Nguyen Thi Hoa,Vu Dinh Thao,Le Viet Ngan,Nguyen Nhat Huy
In this study, cobalt ferrite coated carbon felt (CoFe 2 O 4 /CF) was synthesized by solvothermal method and applied as cathode for electro-Fenton (EF) treatment of tartrazine (TTZ) in water. The materials were characterized by SEM, XRD, FTIR, CV, and EIS to explore their physical, chemical, and electrical properties. The effects of solvothermal temperature and metal content on the TTZ removal were examined, showing that 220 °C with 2 mM of Co and 4 mM of Fe precursors were the best synthesis condition. Various influencing factors such as applied current density, pH, TTZ concentration, and electrolytes were investigated, and the optimal condition was found at 8.33 mA cm −2 , pH 3, 50 mgTTZ L −1 , and 50 mM of Na 2 SO 4 , respectively. By radical quenching test, , 1 O 2 , and HO were recognized as the key reactive oxygen species and the reaction mechanism was proposed for the EF decolorization of TTZ using CoFe 2 O 4 /CF cathode. The reusability and stability test showed that the highly efficient CoFe 2 O 4 /CF cathode is very promising for practical application in wastewater treatment , especially for dyes and other recalcitrant organic compounds to improve its biodegradability .
研究领域:
环境科学
·
水处理
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Shiyu Liu,Rongchang Wang,Cuixiang Ma,Dianhai Yang,Duanxin Li,Zbigniew Lewandowski
Oxygen and reactive oxygen species (ROS) produced during algal photosynthesis are important electron acceptors in photosynthetic algal microbial fuel cell (PAMFC) cathodes. In this study, spongy and petaline ZnO– [email protected] carbon felt cathodes were first fabricated through in situ ZnO–NiO growth and further modified with reduced graphene oxide (rGO) via electrodeposition and cyclic voltammetry reduction. The structural and electrochemical properties of the ZnO– [email protected] carbon felt cathodes were characterized, and the ROS adsorption capacity of the cathodes was analyzed via temperature programmed desorption and UV spectrophotometry. The results illustrated that the optimal molar ratio of Zn to Ni was 0.2 for cathode surface modification, and the specific surface areas of spongy and petaline ZnO 0.2 – [email protected] reached 215.26 and 230.88 mg·g −1 , respectively, which were more than 200-fold higher than that of prefabricated carbon felt. The areal capacitance values of spongy and petaline ZnO 0.2 – [email protected] cathodes reached 3033.5 and 6388.92 mC·cm −2 , respectively. The ROS concentrations on the spongy and petaline ZnO 0.2 – [email protected] cathode surfaces reached 52.36 and 64.02 μmol·L −1 , respectively, which were nearly 2-fold higher than that for prefabricated carbon felt cathode. The power densities of PAMFCs using spongy and petaline ZnO 0.2 – [email protected] as cathode electrodes were 20.18 and 31.92 mW·m −2 , respectively. The improvement of electrochemical performance of PAMFCs is partially ascribed to the enhanced ROS adsorption capacity of ZnO– [email protected] cathodes. Therefore, ROS adsorption capacity is recommended as an evaluation indicator for PAMFC cathodes.
研究领域:
环境科学
·
电化学
·
材料科学
·
微生物燃料电池
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）