WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 83
·期 8
·2038-2050
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IF 1.915
Li Changyu,Sheng Yanqing
Vivianite crystallization is a promising route for phosphorus (P) recovery from P-rich wastewater. However, organic matter (OM) in wastewater may influence vivianite formation. In this study, the effects of four representative OMs, glucose, bovine serum albumin (BSA), humic acid (HA) and sodium alginate (SA), on P recovery by vivianite were investigated. The results showed that P recovery efficiency was inhibited by HA and SA, declining by 3.7% and 12.1% under HA (100 mg/L) and SA (800 mg/L), respectively. BSA, HA and SA affected the aggregated form of vivianite crystals. Vivianite particle size decreased in the presence of HA and SA. Subsequent mechanistic exploration indicated that the complexation between the OM and Fe 2+ was the main cause of P recovery efficiency reduction. The coprecipitation of HA and SA with vivianite could reduce the zeta potential on the crystal surface, resulting in a smaller particle size. The nucleation sites provided by BSA and SA could transfer vivianite from single plate-like agglomerate to multilayer plate-like agglomerate. This study provided a better understanding of P recovery by vivianite from OM-rich wastewater. Glucose, BSA, HA and SA affected vivianite crystallization from wastewater. OM might reduce P recovery rate by competition adsorption of Fe 2+ . The morphology of vivianite crystals were different under SA and BSA. Negative correlation presented between OM and Fe/P ratios during crystallization.
研究领域:
环境科学
·
水处理技术
·
材料科学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Haiyang Hu,Bingnan Song,Yang Lei
Phosphonates are widely used scale inhibitors, but the residual phosphonates in drainage are challenging to remove because of their chelating capacity and resistance to biodegradation. Here, we reported a highly efficient and robust Fe-electrocoagulation (Fe-EC) system for phosphonate removal. Surprisingly, we found for the first time that phosphonates like NTMP were more efficiently removed under anoxic conditions (80% of total soluble phosphorus (TSP) in 4 min) than oxic conditions (0% of TSP within 6 min) in NaCl solution. A similar phenomenon was observed when other phosphonates, such as EDTMP and DTPMP, were removed, highlighting the importance of iron complexation and floc formation toward phosphonate removal with Fe-EC. We also showed that the removal efficiency of NTMP by electrochemically in-situ formed flocs (97%) was much higher than post-adsorption systems (ex-situ, 40%), revealing that the growth of flocs consumed the active site for NTMP adsorption. Beyond the removal of TSP, 10 % of NTMP-P was also degraded after the electrolysis phase, evidenced by the evolution of phosphate-P. However, this did not happen in anoxic or chemical coagulation processes, which confirms the formation of reactive oxygen species via Fe(II) oxidation in the oxic Fe-EC system. The primary removal mechanism of phosphonates is due to their complexation with iron (hydr)oxide generated in the Fe-EC system by forming a Fe-O-P bond. Encouragingly, the Fe-EC system exhibits comparable or even better performance in treating phosphonate-laden wastewater (i.e., cooling water). Our preliminary cost calculation suggests the proposed system (€ 0.009/m 3 ) has a much lower OPEX under oxic conditions than existing approaches. This study sheds light on the removal mechanism of phosphonate and the treatment of phosphonate-laden wastewater by playing with the iron complexion and flocs formation in classical Fe-EC systems.
研究领域:
环境工程
·
水处理
·
化学工程
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Zhongxiang Bai,Tingdan Deng,Nini Luo,Li Yang,Jingjiang Wei,Pan Wang,Yuanlai Fang,Xulin Yang,Kun Yang,Kun Jia,Qingyuan Wang
Superhydrophobic/superoleophilic sponges with hierarchical biomimetic surfaces hold great potential for application in oil/water separation. However, the process of coupling hierarchical rough structures with hydrophobic chemical groups to fabricate biomimetic superhydrophobic surfaces remains tedious and complicated, making industrial promotion challenging. Herein, we developed an oxidation-mediated kinetic strategy to fabricate a biomimetic interlayer on melamine sponge (MS) skeletons. Initially, the precursor tannic acid-Fe II (TA-Fe II ) complexes were oxidized to interface-active TA-Fe III species. This transformation facilitated the controlled deposition of a biomimetic coating with precise spatial and temporal regulation. Subsequently, octadecylamine modification was employed to impart superhydrophobic properties to the functionalized sponge. Compared with the TA-Fe III mediated hydrophobic sponge by discrete assembly and layer-by-layer self-assembly, the intermediate layer generated by continuous oxidative growth of the TA-Fe II system features a hierarchical spherical rough morphology and demonstrates superior hydrophobicity, achieving a water contact angle of 165°. In addition, the modified sponge exhibits excellent hydrophobic properties in a wide range of application environments, and has excellent oil/water separation performance in both static and dynamic operating environments. It is expected that this simple and effective biomimetic superhydrophobic coating preparation process can provide a reference for applications based on superhydrophobic surfaces.
研究领域:
材料科学
·
化学工程
·
表面工程
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jianbin Deng,Shiqi Gao,Mengqi Liu,Weiquan Xie,Guang-Yu Pan
To better treat bacteria-infected wounds and promote healing, new wound dressings must be developed. In this study, we obtained PA@Fe by chelating iron trivalent ions (Fe 3+ ) with protocatechualdehyde (PA), which has a catechol structure. Subsequently, we reacted it with ethylene glycol chitosan (GC) via a Schiff base reaction and loaded vancomycin to obtain an antibacterial Gel@Van hydrogel with a photothermal response. The as-prepared Gel@Van hydrogel exhibited good injectability, self-healing, hemostasis, photothermal stability, biocompatibility, and antioxidant and antibacterial properties. Moreover, Gel@Van hydrogel achieved highly synergistic antibacterial efficacy through photothermal and antibiotic sterilization. In a mouse skin-damaged infection model, Gel@Van hydrogel had a strong ability to promote the healing of methicillin-resistant Staphylococcus aureus ( MRSA )-infected wounds, indicating the great potential application value of Gel@Van hydrogel in the field of treating and promoting the healing of infected wounds.
研究领域:
材料科学
·
生物医学工程
·
伤口护理
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Yang Li,Bo He,Jinbin Lin,Baoxue Zhou,Francesco Parrino,Mingce Long
Polymerization-based abatement of phenolic pollutants triggered by thermally activated sodium peroxydisulfate (PDS) is an effective remediation approach characterized by low oxidant consumption but restricted by narrow reaction conditions and risk of overoxidation of the organics. In particular, the polymerization is ineffective for recalcitrant phenolics and at low temperature, low initial concentration of phenolics, and high PDS dosage. The present contribution demonstrates that adding ferric chloride significantly enhances the removal efficiency, polymerization ratio, and PDS utilization efficiency, especially under the unfavorable conditions mentioned above. In the FeCl3-enhanced heat/PDS system, polymerization is promoted by iron-phenolic complexes, which favor the generation of more stable radical monomers through ligand to metal charge transfer. The ferrous ions thereby formed can accelerate PDS activation, thus synergistically contributing to polymerization. In comparison to the conventional mineralization-based advanced oxidation technologies, this process exhibits significantly higher oxidant utilization efficiency under a broad range of conditions, reducing PDS consumption by 85% when used for the treatment of real coking wastewater. Results highlight the great potentiality of this technology for the removal of phenolic pollutants and bring fundamental insights for low-carbon emission and sustainable remediation of industrial wastewater.
研究领域:
环境化学
·
水处理
·
高分子科学
·
氧化工艺
·
工业废水修复
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）