PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Hongyuan Liu,Xueyi Lou,Yeyao Shao,Zhichao Wang,Jiamin Xiao,Kai Cen,Dingyin Chen,Qiman Xia,Wenlong Xu,Fang Fang,Yasin Orooji,Peng Liu
To address chlorophenol wastewater pollution, immobilized mixed white rot fungi (WRF) strain microsphere was designed as a solid degradation agent. This agent uses lignin peroxidase ( LiP ), manganese peroxidase ( MnP ), and laccase ( Lac ) to degrade the wastewater. Considering the diverse physical and chemical properties of the fungal microsphere, the immobilization agent formula is optimized, and comprehensive environmental factor design response surface analysis are implemented to determine the optimal delivery conditions. Consequently, the 2,4-dichlorophenol (2,4-DCP) treatment rate and extracellular enzyme activity for a 1:1 encapsulation of T. versicolor and P. sajor-caju significantly outperform those of individual strains. The degradation efficiency reached 85.81%, with Lac activity reaching 31.2 U/mL and LiP activity reaching 29.8 U/mL. Using polyvinyl alcohol (PVA), sodium alginate (SA), and biochar as carriers, and sodium dihydrogen phosphate solution as crosslinker, with SiO 2 /zeolite as additives, the immobilized mixed fungi yielded a high-quality solid agent. This achieved a 99.33% 2,4-DCP degradation rate over 96 hours, with optimal dosage, pH, and initial 2,4-DCP concentration at 11.5 g/L, 5.5, and 40 mg/L, respectively. The degradation of 2,4-DCP by WRF selectively removes adjacent chlorine atoms to produce 4-CP, enhancing the dechlorination efficiency.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiulan Weng,Huijing Ma,Gary Owens,Zuliang Chen
Recently, bimetallic Fe-Pd nanoparticles were integrated with metal organic frameworks (MOFs) to produce a new composite catalyst with significant potential for organic contaminant removal due to enhanced adsorption and reduction. Here, 85.9 % of 2,4-dichlorophenol (2,4-DCP) was successfully removed from aqueous solution within 120 min when using a zinc-based zeolitic imidazolate framework (ZIF-8) embedded with Fe-Pd (Fe-Pd@ZIF-8). In comparison only 77.4 and 48.3 % was removed when using ZIF-8 or Fe-Pd alone. Thus, to better understand the function of composite components (ZIF-8 and Fe-Pd) in the removal of 2,4-DCP, and the specific removal mechanism involved, Fe-Pd@ZIF-8 was characterized before and after exposure to 2,4-DCP. This comparison revealed that 2,4-DCP was adsorbed onto the surface of the composite during exposure. Moreover, while ZIF-8 maintained stability following the removal of 2,4-DCP, Fe 0 was partially oxidized and Pd functioned as a catalyst in the removal process. Furthermore, kinetic studies demonstrated that the initial adsorption of 2,4-DCP conformed to a pseudo-second-order model and the subsequent reduction conformed to a pseudo-first-order model, whereas isothermal adsorption best fit the Freundlich adsorption model. This observation suggested that removal mechanism of 2,4-DCP involved both adsorption and dechlorination. Finally, Fe-Pd@ZIF-8 was applied to practically remove 2,4-DCP from wastewater, showing a 74.4 % removal efficiency which indicated that the composite was a potential new nanomaterial for practically removing organic contaminants from wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Peng He,Jianyu Zhu,Yaozong Chen,Fang Chen,Jinglei Zhu,Mengfei Liu,Ke Zhang,Min Gan
Organic pollutants and heavy metals often coexist in wastewater, their simultaneous and effective removal from wastewater has a particular significance for environmental remediation. In this study, pyrite (FeS 2 ), the most abundant iron mineral in the Earth’s crust, was selected as a catalyst to activate persulfate for the simultaneous removal of 2,4-dichlorophenol (2,4-DCP) and Cr(VI), two common contaminants in wastewater. The results indicated that 76.2% of 2,4-DCP and 80.1% of Cr(VI) were simultaneously removed within 120 min in the pyrite/persulfate system. The simultaneous removal efficiency of 2,4-DCP and Cr(VI) by the pyrite/persulfate system was influenced by the contaminant concentration, solution pH and organic acids. The radicals SO 4 ·− and ·OH were detected as the oxidative species in the pyrite/persulfate combined system using electron spin resonance (ESR) spectroscopy, and quenching experiments with methanol and tert-butanol indicated that SO 4 ·− played a predominant role in the degradation of 2,4-DCP. The radicals (SO 4 ·− and ·OH) produced from the activation of persulfate by pyrite principally contributed to 2,4-DCP disintegration, while the removal of Cr(VI) was primarily attributed to the reduction ability of pyrite. Experiments and density functional theory (DFT) calculation results indicated that Fe is the main catalytic site, and the reductive sulfides of the pyrite surface mediated Fe 2+ recovery as donors during reaction processes. This work presented a ubiquitous natural sulfide mineral with excellent catalytic performance in the heterogeneous persulfate activation, implying a new strategy in wastewater treatment for simultaneous removal of heavy metal and organic compounds.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Pengwei Yan,Jimin Shen,Shuyu Wang,Yanchi Zhou,Jing Kang,Lei Yuan,Lanbo Bi,Yabin Li,Zhonglin Chen
CuO as a heterogeneous catalyst was synthesized by calcination method and characterized via various technologies. A series of metal oxides were synthesized by the same process to compare the catalytic performance. The CuO activated peroxymonosulfate (PMS) catalytic system can effectively degrade 2, 6-dichlorophenol (2,6-DCP). The effect of the calcination temperature on CuO performance was investigated, which showed that the catalytic performance was the highest at a calcination temperature of 400 °C. The effect of various factors such as catalyst dose, PMS dose, solution pH, NOM concentration and inorganic ions (Cl − , NO 3 − , SO 4 2− and HCO 3 − ) on the removal of 2, 6-DCP were probed. SO 4 − and OH play the predominant role for the degradation of 2, 6-DCP. According to the kinetic calculation of the quantitive experiment by nitrobenzene and benzoic acid, the generation concentrations of OH and SO 4 − can reach 5.92 × 10 −13 mol/L and 7.92 × 10 −13 mol/L, respectively. The degradation mechanism of 2, 6-DCP main including OH substitution for Cl atom, ring-opening and mineralization.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xiaojun Zhou,Lingshuai Kong,Zongyu Jing,Shuqing Wang,Yongchao Lai,Meng Xie,Long Ma,Zhenyu Feng,Jinhua Zhan
In this study, superparamagnetic β-CD-MnFe 2 O 4 with a large surface area was synthesized via a facile co-precipitation method, with β-cyclodextrin (β-CD) acting as a coating agent. The as-prepared β-CD-MnFe 2 O 4 exhibited better catalytic performance than bare MnFe 2 O 4 in terms of activating peroxymonosulfate (PMS) to degrade 2,4-dichlorophenol (2,4-DCP) over a broad pH range of 5–11. Electron spin resonance spectroscopy (ESR) and free radical quenching experiments indicate that various active species (SO 4 − / OH/O 2 − / 1 O 2 ) are generated in the β-CD-MnFe 2 O 4 /PMS system and that pollutants trapped in the cyclodextrin cavity are quickly degraded. Various reaction parameters of the β-CD-MnFe 2 O 4 /PMS system and the stability of β-CD-MnFe 2 O 4 were also investigated. The results indicate that β-CD-MnFe 2 O 4 is promising for use in water purification owing to its excellent magnetic separation and recovery properties and good resistance to humic acid (HA).
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 10
·1690
·
IF 5.719
Wei Guo,Chang Bo,Wenjing Li,Zhiying Feng,Erli Cong,Lijuan Yang,Libin Yang
The narrow band gap and significant separation of photogenerated carriers are essential aspects in practical photocatalytic applications. Nitrogen doping usually narrows the band gap of semiconductor oxides, and it enhances photocatalytic activity. Nitrogen-doped Nb2O5was prepared by a multiple hydrothermal method. The non-metal element N inside the nanostructure, working as the trapping sites for the holes, which were effectively incorporated into the crystal lattice of Nb2O5semiconductor oxide, remarkably shorten the band gap (3.1 eV) to enhance the visible light response, effectively reducing the photoinduced electron–hole pair recombination and prolonging carrier lifetime. The multilayer coating structure with a gradient concentration distribution and the type of nitrogen doped is favorable for the migration of photoexcited carriers in the bulk of catalysts. The unique multi-layer coating with the micro-concentration gradient of doped nitrogen provides a fast separation channel and jump steps for the separation of electron–hole pairs.Keywords:photocatalysis;niobium pentoxide;photogenerated holes;degradation;2,4-dichlorophenol
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Yue Lu,Fangyi Liang,Fanzhi Qin,Linrui Zhong,Jianhong Jiang,Qi Liu,Shoujuan Zhang,Ming Yan,Changzheng Fan,Haoran Dong
The dehalogenation of organohalides has been a research hotspot in bioremediation field; however, the influence of tourmaline, a natural ore that can generate spontaneous electric field, on organohalide-respiring bacteria (OHRB) and their dechlorination process is not well known. In this study, the effect and mechanism of tourmaline on the reductive dechlorination of 2,3-dichlorophenol (2,3-DCP) by Desulfitobacterium hafniense DCB-2 T were explored. The characterization results confirmed that tourmaline had good stability and the optimal dosage of tourmaline was 2.5 g/L, which shortened the total time required for dechlorination reaction to 72 hr. Besides, tourmaline amendment also increased the proportion of 2-chlorophenol (2-CP) from 18% to 30% of end products, while that of 3-CP decreased correspondingly. The theoretical calculations showed that the bond charge of the ortho -substituted chlorine declined from -0.179 to -0.067, and that of meta -substituted chlorine increased from -0.111 to -0.129, which indicated that the spontaneous electric field of tourmaline affected the charge distribution of 2,3-DCP and was more conducive to the generation of 2-CP. Overall, tourmaline with the spontaneous electric field affected the reductive dechlorination pathway of Desulfitobacterium ,and the tourmaline-OHRB combining system might serve as a novel strategy for the bioremediation of environments polluted with chlorinated phenols.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 1
·1060-1066
·
IF 1.338
Lv Xiangying,Wang Yonghao,Wang Yongjing,Lin Zhang
The self-supported ZnS microsphere composed of interwoven nanosheets was synthesized by hydrothermal method. The as-prepared ZnS powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic activity of the fabricated ZnS powders was
evaluated by the degradation of 2,4-dichlorophenol (DCP) under UV light. Effects of DCP initial concentration, ZnS dosage, solution pH, light source, and dissolved oxygen on DCP photocatalytic degradation efficiency were investigated and optimized systematically. Results demonstrated that
53% of DCP could be effectively degraded under the optimal experimental conditions. Finally, highperformance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS) were used to analyze the degradation products. Based on the experimental results obtained, a probable degradation
pathway was proposed.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Zongtang Liu,Congcong Ding,Pingting Gao,Yunxia Xu,Yufeng Sun,Xiaoju Wen,Jingtao Dai,Zhenghao Fei
For the first time, the dechlorination of 2,6-dichlorophenol (2,6-DCP) by carbon nanotubes supported Fe/Ni nanoparticles (CNTs-Fe/Ni) was studied to explore the practicability of environmental remediation. Removal capacity of CNTs-Fe/Ni for 2,6-DCP was enhanced obviously compared to Fe/Ni due to reduced aggregation of Fe/Ni nanoparticles .The removal efficiency increased as the increase of CNTs-Fe/Ni dosage and Ni loading, whereas it decreased as the increase of 2,6-DCP concentration. Weak acidic condition was considered to be advantageous to 2,6-DCP dechlorination. The dechlorination kinetics results suggested that the 2,6-DCP removal by CNTs-Fe/Ni accorded with pseudo-first-order equation. Moreover, carbon nanotubes as support accelerated the mass transfer of 2,6-DCP from solution to catalyst surface and promoted the formation of atomic hydrogen, which also led to an enhancement of reactivity of CNTs-Fe/Ni on removing 2,6-DCP.
研究领域:
环境科学
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纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 8
·4563-4571
·
IF 3.108
Hefei Wang,Yongsheng Zhao,Yan Su,Tianyi Li,Meng Yao,Chuanyu Qin
The degradation process of 2,4-dichlorophenol (2,4-DCP) in aqueous solution by a Fenton-like system using calcium peroxide (CaO2) particles as a source of solid H2O2 was investigated. EDTA was added to the system to chelate iron and promote the Fenton-like reaction. The results show that 2,4-DCP can be readily degraded in a CaO2/EDTA-chelated Fe(II) system. Compared with an H2O2/EDTA-chelated Fe(II) system, 2,4-DCP degradation showed a moderate reaction rate owing to the slow dissolution process of the CaO2 particle. Complicated degradation kinetics were observed and the possible reason was revealed. The initial amount of EDTA chelated iron lost during the Fenton-like reaction was in the range 20–30%. The effects of different reaction parameters, such as initial pH, CaO2 dosage and amount of EDTA–chelated iron, on 2,4-DCP degradation were studied. According to the identification of dominant reactive species and degradation intermediates, a possible theoretical degradation pathway of 2,4-DCP was proposed.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Xiang Li,Minghua Zhou,Yuwei Pan,Liting Xu
The abatement of chlorophenols is of great environmental importance. Though Fe 0 can activate persulfate (PS) to improve performance, our findings proved that pre-magnetized Fe 0 (Pre-Fe 0 ) could significantly enhanced the degradation and dechlorination of 2,4-dichlorophenol (2,4-DCP), and this Pre-Fe 0 /PS process was more efficient than Fe(II)/PS. The Fe 0 before and after magnetization was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), suggesting the acceleration of Fe 2+ release after magnetization. The effects of some important operating parameters such as Fe 0 dosage, PS dosage, pH, and initial 2,4-DCP concentration on the 2,4-DCP degradation and dechlorination by Pre-Fe 0 /PS were investigated and compared with that of Fe 0 /PS, observing a 1.9–5.2-fold enhancement in the degradation rate of 2,4-DCP. Although SO 4 − was the dominant active species responsible for 2,4-DCP degradation in two processes, pre-magnetization could promote more OH generation. Identified by GC–MS and IC, the degradation intermediates such as 4-chlorophenol (4-CP), 2-chlorophenol (2-CP), phenol, and some carboxylic acids were detected, and possible degradation pathway was proposed. This Pre-Fe 0 /PS process was also efficient for 4-chlorophenol and chlorobenzene degradation, obtaining a 5.2 and 3.2 folds enhancement, respectively. This work demonstrated that such a Pre-Fe 0 /PS would be very promising and environmental-friendly for organics degradation and dechlorination since pre-magnetization required no extra energy source while the introduction of Pre-Fe 0 was rather simple and no need to change the present treatment system.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHOTOENERGY
·
2019
·
IF 2.026
Manqing Ai,Wenli Qin,Tian Xia,Ying Ye,Xuegang Chen,Pingping Zhang
Novel nanocomposites have been prepared by intercalating TiO2 nanoparticles into talc. The nanocomposites have been verified by X-ray diffraction (XRD) from the appearance of a characteristic diffraction peak of TiO2. Thermal behavior of the prepared samples is examined by thermogravimetric analyzer (TGA), scanning electron microscope (SEM), and energy dispersive spectrometer (EDS), which have shown no TiO2 particles on the surface of the talc. The TiO2 particles are found in the layers of talc by transmission electron microscopy (TEM) and the Brunauer-Emmett-Teller (BET) method, which have shown the increase of specific surface areas and total pore volumes and the decline of average pore diameters. As the strong adsorption ability of talc can intensify the power of photon absorption and capture-recombination carriers, more than 99.5% of 2,4-dichlorophenol can be degraded in 1 h by the nanocomposite under an ultraviolet lamp in neutral solution and room temperature after reaching adsorption equilibrium, and the result of adsorbance is in accord with the first-order kinetic. The degradation rate was maintained at about 99% after 20 times. Therefore, the prepared talc/TiO2 nanocomposite is an efficient, stable, and recyclable material for wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 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）