SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Xin Chen,Ming Zhang,Haowei Qin,Jiancheng Zhou,Quanhao Shen,Ke Wang,Wenshuai Chen,Maochang Liu,Naixu Li
The perovskite-type LaFeO 3 serves as a promising photo-Fenton-like catalyst, but its low adsorption ability and catalytic activity inhibit the effective removal of ofloxacin. Herein, the LaFeO 3 and lignin-biochar composites were fabricated by a facile sol–gel pyrolysis route. As compared with LaFeO 3 nanoparticles, the LaFeO 3 /lignin-biochar composites showed better adsorption and degradation ability due to the synergistic effect between LaFeO 3 nanoparticles and lignin-biochar. Compared with LaFeO 3 , the adsorption capacity of LaFeO 3 /lignin-biochar for ofloxacin increased from 0.72 to 30.4 mg·g −1 . Importantly, this catalyst exhibited the improved degradation efficiency of ofloxacin during 75 min (95.6 % for LaFeO 3 /lignin-biochar Vs 53.4 % for LaFeO 3 ) as the adsorption process was combined with the photo-Fenton-like process. Notably, the lignin-biochar in the LaFeO 3 /lignin-biochar composites decreased the bandgap of LaFeO 3 nanoparticles from 2.10 eV to 1.79 eV due to the interface interaction between LaFeO 3 and lignin-biochar, facilitating the enhanced photo-Fenton-like activity. The hydroxyl radicals that were generated in the photo-Fenton-like process effectively induced the oxidative degradation of ofloxacin, which was confirmed by free radical capture experiments and ESR characterization. Moreover, the photo-Fenton-like degradation pathway of ofloxacin was proposed according to LC-MS analyses, and the toxicity analysis of degradation intermediates was further carried out. Hence, the LaFeO 3 /lignin-biochar composite was a promising photo-Fenton-like catalyst to eliminate ofloxacin via coupling of adsorption and photo-Fenton-like processes.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Haihong Liu,Yumin Zhang,Huiping Shao,Zheng Yan,Xin Ke
In this work, the co-precipitation method was used to prepare Fe-doped BiOCl-modified materials for visible photocatalytic degradation of ofloxacin in water by taking advantage of the property that the acidic nature of FeCl 3 ·6H 2 O dissolved in water can improve the surface structure of the materials. In order to improve the problems of BiOCl’s poor absorption of visible light and high compounding rate of electron-hole pairs, the transition atom Fe is introduced to add impurity energy levels in BiOCl, which effectively reduces the bandgap width of the material and promotes the photogenerated electron migration of the material, and it is calculated that after modification, the band gap of the material can be reduced to 2.79 eV, which is a decrease of 0.32 eV compared to the original BiOCl (3.11 eV). Fe acts as an electron trap to capture electrons in electron-hole pairs and slows down their complexation with holes, effectively enhancing the stability of carrier separation in the material. Through free radical quenching experiments and ESR assays, it is understood that superoxide radicals are one of the free radicals needed in that act in the reaction process, indicating that the efficient electron capture enables the electrons to better react with adsorbed oxygen to generate superoxide radicals, which enhances the oxidizing ability of the system. Meanwhile, the degradation ability of modified materials on ofloxacin has been studied. Compared to the original BiOCl, under the condition of adding 50 mg/100 mL, the degradation ability of modified materials on ofloxacin has significantly improved. After 100 min of light exposure, the degradation efficiency of OFL·(10 mg/L) increased from 26.10% to 88.02%.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Guanshu Zhao,Jing Ding,Fanyang Zhou,Xueqi Chen,Liangliang Wei,Qingwei Gao,Kun Wang,Qingliang Zhao
Inefficient utilization of photo-induced charge carriers and low recyclability are limitations for photocatalyst to get access to the practical application. A novel ternary BiVO 4 /g-C 3 N 4 /NiFe 2 O 4 composite with dual Z-scheme heterojunction was successfully developed and constructed to enhance the separation of photo-induced charge carriers and the absorption range of visible light. The structure, composition, morphology, magnetic, and optical properties of this photocatalyst were investigated comprehensively. The photocatalytic performance, mechanism, and pathway of ofloxacin degradation under visible light were studied. Results indicated that the internal interaction between different semiconductors presented the successful fabrication of ternary composite, and its red shift of adsorption range of visible light contributed to an enhancement of photocatalytic ability. The as-prepared ternary composite exhibited highest photocatalytic removal rate constant for ofloxacin, which was 3.8, 16.3 and 71.2 times as much as that of the pure BiVO 4 , pure g-C 3 N 4 and pure NiFe 2 O 4 , respectively. The five successive recycling experiments exhibited the high photocatalytic stability of the as-prepared catalyst, with simple recovery operation due to its magnetic property. The holes and superoxide radicals dominated the photocatalytic degradation process of pollutants. A dual Z-scheme heterojunction other than conventional heterojunction was responsible for the enhancement on redox capacity and the separation of charge carriers. Different transformation products during ofloxacin photocatalytic degradation were identified and transformation pathway was put forward. This study provides a promising strategy on the application of visible-light-driven photocatalysts in water treatment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Yuxuan Yang,Yanxiao Chi,Kunlun Yang,Zengshuai Zhang,Peng Gu,Xueli Ren,Xiaorui Wang,Hengfeng Miao,Xinhua Xu
A green, low-cost, high-performance Fe/N co-doped biochar material (Fe-N@C) was synthesized using salvaged cyanobacteria without other extra precursors for peroxymonosulfate (PMS) activation and ofloxacin (OFX) degradation. With the increased pyrolysis temperature, the graphitization degree, the specific surface area and the corresponding groups like OH, COO etc. for Fe-N@C tended to increase, resulting in a greater OFX adsorption. However, the total amount of Fe-N X and graphitic nitrogen groups in the Fe-N@C composites was firstly increased and then decreased, which reached the highest at 800 °C (Fe-N@C-800). All these changes of functional species ascribed to the strong interaction between Fe, N and C led to the highest defect degree of Fe-N@C-800, resulting the highest OFX removal efficiency of 95.0 %. OFX removal experiments indicated the adsorption process promoted the total OFX degradation for different functional groups on Fe-N@C composites separately dominated the process of OFX adsorption and PMS catalysis. Radical quenching and electron paramagnetic resonance (EPR) measurements proved free radical and non-free radical pathways participated in Fe-N@C/PMS system. The non-free radicals based on 1 O 2 and high-valent iron-oxo species played a more important role in OFX degradation, leading to the minimal effect of co-existing anions and the high universality for other antibiotic pollutants. Fe-N X was utilized as the main catalytic sites and graphitic nitrogen contributed more to the electron transfer for PMS activation, whose synergistic effect efficiently facilitated OFX degradation. Finally, the possible degradation route of OFX in the Fe-N@C-800/PMS system was proposed. All these results will provide the new insights into the intrinsic mechanism of Fe/N species in carbon-based materials for PMS activation.
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CHEMOSPHERE
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2020
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IF 5.778
He Guo,Zhen Li,Siying Lin,Dongsheng Li,Nan Jiang,Huijuan Wang,Jiangang Han,Jie Li
Herein, degradation of ofloxacin (OFX) by pulsed discharge plasma (PDP) coupled with multi-catalysis using graphene-Fe 3 O 4 nanocomposites was inspected. The graphene-Fe 3 O 4 nanocomposites were prepared by hydrothermal synthesis, and their morphology, specific surface area, chemical bond structure and magnetic property were characterized systematically. Compared with sole Fe 3 O 4 , the specific surface area of graphene-Fe 3 O 4 nanocomposites increased from 26.34 m 2 /g to 125.04 m 2 /g. The prepared graphene-Fe 3 O 4 nanocomposites had higher paramagnetism and the magnetic strength reached 66.05 emu/g, which was prone to separate from solution. Graphene-Fe 3 O 4 nanocomposites could further accelerate OFX degradation compared to sole Fe 3 O 4 . When graphene content was 18 wt%, graphene-Fe 3 O 4 nanocomposites exhibited the highest catalytic activity , and the removal efficiency of OFX enhanced from 65.0% (PDP alone) to 99.9%. 0.23 g/L dosage and acid solution were beneficial for OFX degradation. Higher stability of graphene-Fe 3 O 4 nanocomposites could be maintained although four times use. Graphene-Fe 3 O 4 nanocomposites could catalyze H 2 O 2 and O 3 to produce more ·OH. The degradation products of OFX were identified by liquid chromatography mass spectrometry (LC-MS) and ion chromatography (IC). According to the identified products and discrete Fourier transform (DFT), the degradation pathway was inferred. Further toxicity assessment of products manifested that the toxicity of oral rat 50% lethal dose (LD 50 ) and the developmental toxicity of OFX were reduced.
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JOURNAL OF CHROMATOGRAPHY A
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2018
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IF 3.716
Xue Xiao,Jia Wu,Zhenqun Li,Li Jia
Chiral separation of low concentrations of pharmaceuticals in biofluids is a challenge task. In this study, a method is developed to enantioseparate trace amount of racemic ofloxacin in urine and bovine blood by combining magnetic solid phase extraction (MSPE) and chiral capillary electrophoresis (CE). Poly(3,4-dihydroxyphenylalanine) modified magnetic nanoparticles (polyDOPA-MNPs) are prepared and used as the adsorbents in MSPE to extract ofloxacin. The polyDOPA-MNPs are spherical, about 130 nm in diameter and the polyDOPA shell is about 3 nm. The extraction process of polyDOPA-MNPs for ofloxacin includes 2 min adsorption and 2 min desorption with the assistance of sonication. Under the optimized MSPE conditions (3 mg polyDOPA-MNPs as adsorbents, sample pH 7.0, 75% (v/v) AcOH in methanol as eluent, adsorption time 2 min, desorption time 2 min), the extraction efficiency of ofloxacin is 95%. In chiral CE, pressure-assisted field-enhanced sample injection (PA-FESI) is developed to improve the detection sensitivity of ofloxacin enantiomers. The MSPE/PA-FESI chiral CE method demonstrates a good linearity in the concentration range of 0.01–0.06 μg/mL, with a detection limit as low as 0.29 ng/mL. The feasibility of the method is verified by the successful determination of trace amounts of ofloxacin enantiomers in spiked urine and bovine blood samples.
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TALANTA
·
2024
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IF 5.6
Menglin Wang,Xiaodan Zheng,Zhima Yangcuo,Shiqi Zhang,Lingfang Xie,Qihong Cai
The synergistic effect of sodium dodecyl sulfate (SDS) and Mg 2+ could significantly enhance the fluorescence intensity of enoxacin (ENO) at λ ex /λ em = 269.2 nm/385.6 nm, ofloxacin (OFL) at λ ex /λ em = 290.8 nm/466.2 nm and tetracycline hydrochloride (TCH) at λ ex /λ em = 372.6 nm/514.8 nm. Moreover, when the wavelength difference (Δλ) was chosen 135 nm, the synchronous fluorescence spectra of the three antibiotic complexes could be well separated and the interference of the samples matrix were eliminated primely. Therefore, only one synchronous fluorescence scan was needed to simultaneously determine the three antibiotics. Based on these facts, a synchronous fluorescence spectrometry combining fluorescence sensitization for highly sensitive and selective determination of ENO, OFL and TCH residues in wastewater was developed for the first time. The experimental results showed that the concentrations of ENO, OFL and TCH in the range of 0.5–550 ng mL −1 , 1–1500 ng mL −1 and 10–5500 ng mL −1 showed a good linear relationship with fluorescence intensity. The limits of detection were 0.0599 ng mL −1 , 0.115 ng mL −1 and 0.151 ng mL −1 , respectively. The recoveries of the actual sample were 87.50%–99.99 %, 93.00%–98.50 % and 85.70%–98.42 %, respectively. Overall, the novel synchronous fluorescence spectrometry established in the experiment has the advantages of high sensitivity, good selectivity, fast detection speed and high accuracy. It has been successfully applied to the detection of residual amounts of ENO, OFL and TCH in wastewater with satisfactory results.
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Biomass Conversion and Biorefinery
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2025
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IF 4.1
Sun Zhonghe,Yang Qianhui,Zhu Mingxin,Pan Shunlong,Zhou Hua
In the penicillin fermentation production industry, a large amount of waste bacterial residue is generated annually, posing significant potential risks to the environment. Currently, the most common method of disposal, incineration, wastes a considerable amount of biomass resources. This study utilizes penicillin fermentation bacterial residue as the raw material to prepare two types of high-performance magnetic biochar activated by KOH/K 2 FeO 4 (K 2 FeO 4 -BC, KOH/K 2 FeO 4 -BC) for the adsorption of ofloxacin. The results indicate that the addition of KOH effectively improves the biochar’s adsorption performance for ofloxacin. The BET specific surface areas of the two materials are 777.88 m 2 ·g −1 and 846.16 m 2 ·g −1 , respectively. The average mesopore diameter of KOH/K 2 FeO 4 -BC is 5.34 nm, and the mesopore volume accounts for over 99.5% of the total pore volume. At 298K, the saturated adsorption capacity of KOH/K 2 FeO 4 -BC for ofloxacin is 289.86 mg·g −1 . The experiment demonstrates that the adsorption behavior of ofloxacin on KOH/K 2 FeO 4 -BC is more consistent with the Freundlich model and the second-order kinetic model. KOH/K 2 FeO 4 -BC achieves rapid removal of ofloxacin, with the adsorption removal effect reaching over 95% of adsorption saturation within 30 min. Repeated use experiments show that after five cycles, KOH/K 2 FeO 4 -BC retains 56.71% of its initial adsorption performance. Graphical abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Xuan Liu,Jinliang Huang,Liangliang Chang,Zengzhe Xi,Baoyue Cao,Chunsheng Zhou,Xiaowei Cui
The study compares single-crystal-derived BiFeO 3 (BFO) particles (BFOsc, from flux-TSSG bulk → cleavage-controlled ball milling) with nanoparticles BFO (BFOsg, from tartaric-acid-assisted sol-gel) under fixed nominal composition, thereby eliminating extrinsic complications from doping and heterointerfaces. It demonstrates that BFOsc delivers a mass-normalized pseudo-first-order rate of k = 0.758 min −1 g −1 for ofloxacin under simultaneous visible light and ultrasound, which is 27% higher than that of BFOsg (0.597 min −1 g −1 ), despite a ~ 9-fold lower specific surface area (0.69 vs 6.30 m 2 /g), and affords 61.77% removal within 120 min. Rietveld XRD, PFM/KPFM, PL/TRPL, photoelectrochemistry and spin-trapping EPR collectively show that the long-range ferroelectric domains, low grain-boundary density and dilute isolated oxygen vacancies in BFOsc sustain a more coherent bulk piezoelectric built-in field, suppress non-radiative recombination and enhance ·O 2 − and ·OH generation. DFT further predicts stronger O 2 adsorption (−0.68 eV vs −0.54 eV) and larger model charge transfer (0.78|e| vs 0.67 |e| under charged injection). The work attributes the performance ceiling of BFO piezo-photocatalysis primarily to crystalline integrity and domain order rather than geometric surface area, offering an intrinsic structure-property guideline for multiferroic perovskite water remediation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Yanling Liu,Xiao Wei,Yurou Ye,Xiaping Zhu,Ping Zhao,Wei Ren
The key to building an efficient photo-Fenton system lies in designing and preparing materials with dual photocatalytic and Fenton reaction activities to achieve effective synergy between the two processes, thereby significantly improving the degradation efficiency of organic pollutants. In this work, the CdS-loaded Fe-doped graphitic carbon nitride (CdS/Fe-g-C 3 N 4 ) with a type-II heterojunction was prepared in situ using a hydrothermal approach and employed as an efficient photo-Fenton catalyst for degrading antibiotics. Under optimized conditions (pH 2.0, catalyst concentration of 1.0 g/L and 800 μL of 0.1 mol/L H 2 O 2 ), the system achieves a degradation rate of 95.49% for 100 mg/L OFL within 80 min, with a rate constant (k) of 0.0447 min -1 . This is 22.35 times and 3.49 times higher than those of the CdS/Fe-g-C 3 N 4 +H 2 O 2 system and the light+CdS/Fe-g-C 3 N 4 system, respectively. The photocatalyst retained relatively high photocatalytic activity after 7 cycles, and it is appropriate for degrading many kinds of quinolone antibiotics. Mechanistic studies indicate that the type-II heterojunction formed between CdS and Fe-g-C 3 N 4 drives the directional migration of photogenerated electrons from the conduction band of CdS to that of Fe-g-C 3 N 4 , facilitating the reduction of Fe 3+ to Fe 2+ and significantly accelerating the generation of active radicals (∙OH). Analysis via mass spectrometry (MS) and the T.E.S.T. toxicity assessment software indicates that OFL undergoes stepwise transformation into a series of low-toxicity or non-toxic intermediates during degradation. This research provides a feasible and effective way to treat wastewater with high-concentrations of antibiotics in the industrial field.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Qian Guo,Zuxin Xu,Wenhai Chu,Yingying Zhou,Xiaoting Gao,Cheng Ye
Sewer overflows are a potential source of emerging contaminants to urban waters, posing a threat to ecosystems and human health. Herein, the performance and mechanism of ferrate(Ⅵ) (Fe(Ⅵ))/peroxymonosulfate (PMS), Fe(Ⅵ)/peroxydisulfate (PDS), and Fe(Ⅵ)/percarbonate (SPC) for the degradation of ofloxacin (OFL) in overflows were comparatively investigated. These systems achieved efficient degradation of OFL and the removal of conventional pollutants. Particularly, Fe(Ⅵ)/PMS showed better degradation performance for OFL with a degradation efficiency of 98.8 %. The dominant reactive oxygen species for OFL degradation in the Fe(Ⅵ)/PMS, Fe(Ⅵ)/PDS, Fe(Ⅵ)/SPC systems were singlet oxygen ( 1 O 2 ), sulfate radical (SO 4 · - ), and hydroxyl radical (·OH), respectively. High-valent iron species played an important role in the Fe(Ⅵ)/PMS and Fe(Ⅵ)/PDS systems. Notably, the synergistic effect of oxidation and in-situ coagulation played a key role in OFL degradation, which determined the superior performance of Fe(Ⅵ)/PMS. The formed flocs with Fe-O-P bond acted as a highway to promote the electron transfer from OFL to PMS, resulting in the efficient degradation of OFL in Fe(Ⅵ)/PMS system. Moreover, a same degradation pathway of OFL was found, and the toxicity of the degradation products was reduced, especially in the Fe(Ⅵ)/PMS system. This study provided a new strategy for overflows treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yanning Zheng,Dankui Liao,Bimei Xie,Jinlei Sun,Jianhua Sun,Zhangfa Tong,Guangzhi Zhou
Effective removal of antibiotic residues from water is crucial for maintaining balance and cleanliness in the ecological environment. To achieve this, we conducted a study on the development of a highly efficient catalyst from the in-situ growth of Fe 3 O 4 nanoparticles on nitrogen-doped hollow porous carbon spheres (Fe 3 O 4 @N-HollCS). We controlled the in-situ growth time to optimize its performance. Material characterization and theoretical calculations revealed that the improved catalytic performance of Fe 3 O 4 @N-HollCS is due to electron transfer from the graphitic-N in N-HollCS to the catalytic interface of Fe 3 O 4 nanoparticles. Fe 3 O 4 @N-HollCS, with an ordered mesoporous structure and high specific surface area, had remarkable adsorption capacity for NOR antibiotics, with an enrichment efficiency exceeding 60% within 10 min. Moreover, the Fe 3 O 4 @N-HollCS degraded more than 90% of fluoroquinolone antibiotics, especially norfloxacin (NOR), which was eliminated within 60 min. The Fe 3 O 4 @N-HollCS also exhibited stable catalytic recycling ability within 10 magnetic separations. Fukui function predicted the sensitive sites of NOR, and we proposed potential degradation pathways. Ecological structure activity relationship model evaluation showed that the intermediate produced by Fe 3 O 4 @N-HollCS degradation of NOR has low levels of ecotoxicity. Overall, Fe 3 O 4 @N-HollCS catalysts have great potential for antibiotic wastewater treatment.
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