SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chengfang Zhang,Zhenyu Song,Chao Li,Qinglong Liu,Jingchun Tang
In the actual polluted environment, the composite pollution system was usually composed of heavy metals and organic pollutants, especially Cr(VI) and chlorophenols often co-existed in industrial wastewater. In this study, a composite material consisting of multilayer graphene carbon shells coated with nZVI (gBC@nZVI) with various excellent properties was applied to deal with the composite system of Cr(VI) and 2,4-dichlorophenol (2,4-DCP) coexisting in the wastewater, and the intrinsic mechanism for the simultaneous removal of heavy metals and organic pollutants was systematically investigated. The results showed that in the composite pollution system (Cr(VI) = 20 mg/L, 2,4-DCP = 15 mg/L), complete removal of Cr(VI) could be achieved in 60 min, while 2,4-DCP achieved 95.2 % removal, with the contribution of oxidative degradation being 76.4 %. It was found that during the efficient adsorption and reduction of Cr(VI) by gBC@nZVI, the generation of the metastable intermediate Cr(V) was verified by probe compounds, electron spin resonance and UV–visible spectroscopy, and further experiments demonstrated that the generation of •OH was closely related to Cr(V) and promoted the oxidative degradation of the coexisting 2,4-DCP. Quenching experiments with the addition of specific scavengers indicated that •OH was the active species directly dominating the oxidative degradation of 2,4-DCP, whereas Cr(V) was indirectly involved in the degradation of 2,4-DCP by promoting the generation of •OH. In addition, the increase of solution pH negatively affected the degradation of 2,4-DCP in the composite polluted system, mainly due to the hindered generation of •OH in the alkaline environment. This work provided theoretical support for the promising application of gBC@nZVI in real environments contaminated with a combination of Cr(VI) and chlorophenols.
研究领域:
环境科学
·
水处理技术
·
污染控制
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Xinyue Gu,Jie Mei,Jiahao Lai,Siying Lv,Jing Yang,Shihai Cui,Sen Chen
In view of the deterioration of the environment and the shortage of resources, it is necessary to develop efficient photocatalysts for the degradation of organic pollutants. Herein, a novel and environmentally friendly ZnNb 2 O 6 /g-C 3 N 4 heterojunction nanocomposite was synthesized by calcination-hydrothermal method successfully. The chemical and physical capabilities of the material were characterized by various kinds of analytical instruments. Compared with ZnNb 2 O 6 and g-C 3 N 4 , ZnNb 2 O 6 /g-C 3 N 4 showed the strongest photocatalytic activity. The nanomaterial was used in the removal of the pollutant 2,4-DCP. The effects of degradation conditions were discussed including component ratio, material dosage, initial analyte concentration, pH and salinity. After 180 min’ simulated sunlight illumination, the removal efficiency of 2,4-DCP (10 mg/L) reached 95.7% under the optimum condition. Furthermore, the possible photocatalytic mechanisms were discussed according to four aspects: (i) The conformation of the active species; (ii) The calculation of valence and conduction band; (iii) The analysis Z-scheme heterojunction mechanism; (iv) The speculation of feasible photocatalytic paths. In conclusion, the ZnNb 2 O 6 /g-C 3 N 4 (ZC-7) nanocomposite has the least recombination rate of electron-hole pairs and the highest photocatalytic efficiency.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Guoguan Liu,Shan Zhong,Lishan Zhang,Hangyu Shi,Qian Zhang,Xuan Ru,Yifu Li
This work successfully synthesized Bi@Bi 2 WO 6 with oxygen vacancies (OVs) through chemical etching and systematically revealed the coupling mechanism between OVs and piezoelectric effects. In the piezo-photocatalytic degradation of 2,4-dichlorophenol (2,4-DCP), the 0.1al-BBW sample exhibited the best performance, with an apparent rate constant of 0.05468 min −1 . ERS and PFM characterizations revealed that abundant OVs were introduced by etching, leading to lattice modification and improved piezoelectric polarization. According to density functional theory (DFT) results, the piezoelectric field optimizes charge localization at OVs, strengthens band coupling, reduces carrier recombination, and facilitates the activation of H 2 O and O 2 . Furthermore, Mott-Schottky results and stress-induced simulations (0–8 %) confirmed that both piezoelectric polarization and OVs contribute synergistically to energy band restructuring. Pathway analysis showed that 1 O 2 and h + were the dominant reactive species driving the two main routes of 2,4-DCP decomposition. Overall, this work offers mechanistic insights into OVs coupling with piezoelectric and presents a viable strategy for designing advanced piezo-photocatalysts with multifunctional capabilities.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
催化
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Yixuan Bao,Yuping Zhang,Shilei Wang,Xuemei Liu,Jun Ma,Xiaoting Li,Yang Liao
The widespread use of 2,4-dichlorophenol (2, 4-DCP) in the paper manufacturing, dye synthesis, textile processing, and agriculture applications has led to its persistent accumulation in the ecosystems, posing significant risks to environmental safety and human health. This study developed a MIL-101(Fe)-derived porous carbon material for efficient degradation of 2, 4-DCP through potassium persulfate (PDS)-based advanced oxidation processes. Characterization demonstrated that the synthesized material, compared with its MIL-101(Fe) precursor, possessed enhanced specific surface area and pore size distribution, which could synergistically promote both adsorption and catalytic degradation of 2, 4-DCP. The optimized 700Fe-C/PDS system (0.3 g/L catalyst, 0.5 mM oxidant) achieved 95.99 % degradation rate for 50 mg/L 2, 4-DCP within 90 min, showing rapid degradation ability. Notably, the material maintained >94.34 % degradation efficiency for 2, 4-DCP after five times of reuse without requiring pH adjustment, highlighting exceptional stability and practical applicability. Reactive oxygen species quenching experiments and electron paramagnetic resonance (EPR) analysis elucidated that both radical and non-radical pathways contributed to the degradation process, with 1 O 2 playing a dominant role in the system. Furthermore, the catalyst demonstrated remarkable generalizability, eco-friendliness and effectively degradation for 2, 4-DCP in real municipal wastewater effluent and other organic pollutants including tetracycline, ciprofloxacin, acetamiprid, and sulfamethoxazole. This work provides an efficient, stable, and easily recyclable catalytic material, offering a new strategy for addressing diverse organic contaminants in complex water matrices.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Zhendong Fu,Feng Guo,Jiahe Qiu,Runchi Zhang,Mingxu Wang,Liping Wang
2-Methylimidazole (MIM) is a classic organic ligand that shows excellent thermal stability and chemical robustness and is widely used in ZIFs. Recently, transformations of MOFs have been realized by using metals or ligands. In this study, we propose a new strategy—adjusting MIM by extending the alkyl chain length —to change the properties of related MOFs. Furthermore, we used copper as the metal core to replace zinc to mimic the active sites of laccases (electron transfer between copper and imidazole ring). As a result, the nanostructures transformed from nanoleaves to nanovesicles, which changed the Cu(II)/Cu(I) ratio from 3.7 to 1.7, as well as the lattice constant (decreased the diffraction angle) and enzyme-like activity (inhibition). In addition, we revealed that superoxidase anions were the main factors responsible for its laccase-like activity. We applied it to detect and discriminate phenolics. Laccase-mimicking activity was best at pH 7.0. When compared to protein laccase, the Cu-MeIm nanozyme had a greater Vmax at the same mass concentration. It was used to identify and distinguish phenolics. In the presence of Cu-MeIm nanozymes, the linear range is 0.1–2 mM and the detection limit of 2,4-DCP is 0.034 mM.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
生物化学
·
酶学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chengfang Zhang,Jingchun Tang,Feilong Gao,Chen Yu,Song Li,Honghong Lyu,Hongwen Sun
The defects of easy agglomeration and oxidation of nano zero valent iron (nZVI) limit its large-scale application in industry, especially in the field of environmental remediation. In this study, the iron nanoparticles encapsulated by graphene nano-shells which anchored on the surface of carbon substrate (nZVI@gBC) were synthesized by a one-step carbothermal reduction method aided by Tetrahydrofuran. When the mass ratio of carbon source to iron source is 2:3 and the carbothermic reduction temperature is 700 °C, stabilized nZVI @gBC can be successfully synthesized with a high iron loading rate of 32.5%. The multilayer graphene shell can effectively prevent the rapid passivation and agglomeration of the nZVI core, and the electronic interaction between the iron nanoparticles core and the graphene carbon shell further enhances the catalytic activity and stability of nZVI@gBC. Therefore, due to the unique structure of graphene nano-shells, nZVI@gBC can be stably stored in the air for more than 80 days. In addition, nZVI@gBC exhibited superior catalytic activity in the experiment of removing 2,4-dichlorophenol (2,4-DCP) in groundwater as a persulfate activator. Notably, both the electron paramagnetic resonance (EPR) and quenching tests showed that SO 4 •− , •OH, O 2 •− and 1 O 2 were both involved in the degradation process of 2,4-DCP, and SO 4 •− were the major active species. Simultaneously, three possible degradation pathways of 2,4-DCP were deduced by GC/MS, which were caused by dechlorination, dehydrogenation or carbon–carbon bond cleavage under the attack of SO 4 •− , •OH, O 2 •− and 1 O 2 . Besides, nZVI@gBC can use the dissolved oxygen in the liquid to generate hydroxyl radicals to effectively remove 2,4-DCP without persulfate. This kind of multifunctional nZVI@gBC may become a promising iron-carbon catalyst for large-scale applications in the field of environmental remediation.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PLANT PHYSIOLOGY
·
2023
·
IF 4.3
Gang Wang,Jiali Li,Jing Ji,Lishuang Zhang,Bowen Li,Jiaqi Zhang,Xinya Wang,Wenju Song,Chunfeng Guan
Environmental pollution by 2, 4 dichlorophenol (2, 4-DCP) has become a widespread concern due to its detrimental influence on human and natural ecosystem. With the increasing accumulation of 2, 4-DCP in soil, it is of great significance to explore some appropriate approaches for enhancing plant tolerance to 2, 4-DCP stress. In the current study, a strain resistant to 2, 4-DCP was obtained from the tall fescue rhizosphere soil and named as Pseudomonas sp. JIT1. The strain JIT1 exhibited several remarkable plant growth-promoting traits, including the production of IAA, fixation of biological nitrogen and solubilization of phosphate. The inoculation of strain JIT1 significantly increased biomass, photosynthesis, antioxidant levels, chlorophyll contents and the osmotic substance contents in rice seedlings exposed to 2, 4-DCP. Meanwhile, inoculation of strain JIT1 also enhanced activities of soil alkaline phosphatase, urease, sucrase and cellulase. Moreover, under 2, 4-DCP stress, the content of allantoin in seedlings significantly increased and the pretreatment of exogenous allantoin noticeably ameliorated the negative effects caused by 2, 4-DCP stress in rice seedlings. Interesting, allantoin treatment also enhanced phosphate solubilization properties of strain JIT1. The chlorophyll contents, photosynthesis and osmotic substance further increased by combination use of strain JIT1 and allantoin, which improved the growth of seedlings, most likely to be attributed to the synergistic or additive effect between allantoin and strain JIT1. The results of this study highlight the important roles of combined use of strain JIT1 and allantoin for improving the tolerance of rice to 2, 4-DCP to stress.
研究领域:
环境科学
·
农学
·
微生物学
·
植物生理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Kai Yan,Jianqiao Liu,Jin Qin,Jingdong Zhang
Photoelectrocatalytic (PEC) technology has been considered as one of the most efficient advanced oxidation processes for wastewater treatment , but the necessity of external electric power supply limits the portability of PEC system for on-field applications. Herein, a portable solar-powered biophotoelectrocatalytic system driven by photovoltaic (PV) cells was explored for degradation of pollutant by coupling BiVO 4 /Fe 2 O 3 -deposited photoanode and horseradish peroxidase (HRP)-immobilized cathode. The integration of PV cells in this PEC device could not only avoid the necessary introduction of external electric power supply, but also improve the utilization of solar irradiation. The characterization of BiVO 4 /Fe 2 O 3 photoanode demonstrates that ultrathin Fe 2 O 3 layer on BiVO 4 electrode could facilitate the holes transfer to the surface efficiently and thus avoid charge recombination. After HRP was immobilized on the cathode, the removal efficiency for 2,4-dichlorophenol (2,4-DCP) was obviously promoted, attributed to the efficient HRP-catalyzed oxidation reaction by in-situ generated H 2 O 2 from PEC process. Under natural solar irradiation, the proposed portable biophotoelectrocatalytic device exhibited a satisfying removal efficiency of 92.0% for 100 ppm of 2,4-DCP after 3-h treatment. The intermediate products formed during the degradation process were identified by liquid chromatography-mass spectrometry, and possible 2,4-DCP degradation pathway was also proposed.
研究领域:
环境科学
·
化学工程
·
材料科学
·
可持续能源
✓ 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）