JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2022
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IF 6.437
Li Xiang,Haowen Li,Qipeng Qu,Fawei Lin,Beibei Yan,Guanyi Chen
Heavy oil residue (HOR) as a kind of oil-containing wastes (OW) is suitable to be treated by pyrolysis to obtain valuable products. However, the recovered products remain poor quality due to much heavy fractions in feedstock. This paper employed two typical steel wastes, i.e. iron-rich rolling sludge (FOS) and steel slags (SS), for catalytic pyrolysis of HOR to upgrade pyrolytic products. FOS and SS additions both effectively decreased the temperature of HOR pyrolysis stage and the activation energy . Compared with SS, FOS addition enhanced the yield of CH 4 and H 2 , leading to higher heating values for pyrolytic gases. However, insufficient FOS couldn’t provide enough energy to trigger the conversion of macromolecules as well as the cracking of short-chain alkanes and alkenes . In terms of pyrolytic oil, SS addition greatly improved the content of light fractions and exhibited stronger selectivity in reforming of alkanes into alkenes, while FOS addition promoted aromatization. Furthermore, Fe-doping carbon materials with different valent Fe and abundant defects were obtained through pyrolysis of HOR/FOS and HOR/SS. Combined with their magnetic properties, the separation of materials from contaminants and subsequent cycle utilization could be achieved. Subsequently, the addition of different Fe compounds validated the promotion of zero-valent Fe on aromatization while Fe 2 O 3 on alkenes production as well as Fe oxides would offer active oxygen species to participate in the pyrolysis reaction. However, model Fe compounds were hard to simulate catalytic behaviors of FOS and SS in gas production due to the complex components of steel wastes. This paper provides a novel perspective for upgrading all products from HOR pyrolysis and opens a path for simultaneous disposal of multiple solid wastes.
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高影响因子
DESALINATION
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2022
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IF 11.211
Xiangyunxiu Meng,Ruiwen Luo,Guijie Guo,Yulin Li,Hui Fang,Peng Bai,Jiafei Lyu,Xianghai Guo
Adsorption has been expected to be promising for boron-containing water treatment , boron resources recovery and boron isotopic separation. Although metal-organic frameworks have been demonstrated to be potential adsorbent candidates, in-depth investigation of the structure-performance relationship remains insufficient. Herein, the performance and mechanism of boron adsorption and isotopic separation were systematically investigated with isostructural MOFs. Six isomorphic MIL-100(M) materials with metal species from the third main group (Al, Ga and In) and the fourth period (Sc, Cr and Fe) were solvothermally synthesized as boron adsorbents. Superior boron isotopic separation factors ( S ) with 10 B preference and comparable boron adsorption capacity ( Q ) were observed through batch boron adsorption experiments, where MIL-100(Al) exhibited the highest S of 1.618 and MIL-100(Sc) achieved the largest Q of 8.74 g-B/mol-MOF. A high correlation between metal atomic radius and performance was revealed and a plausible mechanism was proposed for boron adsorption and isotopic separation involving the important role of the metal center through post-adsorption characterization. This study will pave the way for designing boron adsorbents with improved properties and promote the efficient utilization of boron resources in water.
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高影响因子
TRIBOLOGY INTERNATIONAL
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2021
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IF 4.872
Jian Wu,Yanlong Luo,Yifeng Chen,Xiaohua Lu,Xin Feng,Ningzhong Bao,Yijun Shi
Ionic liquids (ILs) are very potential lubricant additives for their strong adsorption and tribochemical reactions at the interface. In this work, poly(ionic liquid) of PImC 6 NTf 2 is used as lubricant additive in base oil of PEG, which can reduce the wear volume by around 65 times under 2.5 GPa. The lubricity is much more advantageous than the geminal dicationic IL of BIm 5 -(NTf 2 ) 2 . The adsorption strength of lubricants is studied by employing the microcalorimeter to evaluate the adsorption heat, AFM to test the adhesion force, and molecular dynamics simulation to calculate the interfacial binding energy. As a result, the adsorption strength of PImC 6 NTf 2 is obviously higher than BIm 5 -(NTf 2 ) 2 , and the lubricity is strongly dependent on the adsorption strength of ILs.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Xiaoming Wang,Qianqian Peng,Xilin Zhang,Xucheng Lv,Xin Wang,Yongzhu Fu
Refractory high-entropy alloy nanocomposites (HEA-NPs) are important class of materials with unique structure and potential applications. Although several synthetic methods have been reported, developing novel routes to prepare nanoscale HEA-based catalysts facilely is still urgently desired. This work takes advantage of confinement assisted arc and plasma shock (APS) to prepare a series of HEA-NPs by regulating the type and proportion of metal precursors. The phase constitutes and morphology of the HEA-NPs are fully characterized. The prepared refractory HEA-NPs possesses five highly dispersed metal components, including titanium (Ti), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo) and simultaneously exhibits an uniform hexagonal morphology of nanocrystals . By taking advantage of its unique corrosion resistance , TiNbTaCrMo HEA-NPs can function as a promising candidate for electrocatalytic hydrogen evolution reaction (HER) in natural seawater . And its catalytic performance after alloying is significantly enhanced compared with the elemental metal. Theoretically, the promoted HER activity can be attributed to the strong adsorption for the various metal components in HEA-NPs caused by the upshifting d -band center close to the Fermi level . Furthermore, this confinement strategy can be further extended to synthesize other HEA-NPs. Our strategy provides a novel method to synthesize various HEA-NPs for further catalytic application.
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PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2021
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IF 9.642
Jingyang Luo,Wei Du,Siqin Chu,Yulu Xu,Qin Zhang,Le Zhang,Xiaoshi Cheng,Wenxuan Huang,Jiashun Cao,Yinglong Su
The occurrence of antibiotic resistance genes (ARGs) in waste activated sludge (WAS) fermentation was investigated with persulfate (PS)-based treatment. ARGs affiliated with multidrug ( mex P), macrolide ( bla OXA-129 ), tetracycline ( tet B), sulfonamide ( sul 1), and vancomycin ( van RG) types were significantly decreased by PS/Fe treatment. Mechanistic investigations revealed that PS/Fe possessed oxidating potential and exhibited devastating effects on WAS fermentation. First, PS/Fe promoted cell structure damage, which facilitated ARGs release from potential hosts. A co-occurrence network analysis indicated that Fe/PS suppressed the proliferation of potential host bacteria. In addition, the PS/Fe treatment induced the decreased abundance of certain functional genes involved in pathways associated with ARGs dissemination. Finally, variation partitioning analysis demonstrated that the microbial community structure exhibited more vital effects on ARGs fates than physicochemical factors ( i.e., pH and ORP) and gene expression ( i.e., two-component system). This work provided a deeper understanding of the critical factors used to determine ARGs fates during WAS fermentation.
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PubMed
高影响因子
WASTE MANAGEMENT
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2021
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IF 7.145
Junya Zhang,Tiedong Lu,Hui Zhong,Peihong Shen,Yuansong Wei
It is unadvisable to discuss the antibiotic resistance genes (ARGs) reduction in anaerobic digestion (AD) system neglecting its main purpose-methane production. The methane production improvement coupling with antibiotic resistance genes (ARGs) reduction in anaerobic digestion (AD) by zero valent iron (ZVI) were simultaneously investigated. Whether the role of ZVI on the ARGs fate was random or specific was clarified through the high-throughput qPCR (HT-qPCR). Results indicated that ZVI improved methane production and ARGs reduction by 23.9% and 25.0%, respectively. The improved methane production was associated with chemical reaction and variances of microbial community caused by ZVI, where DIET between Petrimonas , Clostridium and Syntrophomonas , Methanosarcina was established along with ACAS being enriched. ZVI specifically, not randomly, facilitated the reduction of aminoglycoside resistance genes of antibiotic inactivation and tetracycline resistance genes of ribosomal protection proteins. The specifical reduction could be attributed to enzyme activity inhibition and intracellular ionic disturbance caused by higher amounts of ZVI, although most of ARGs fate could be well explained by microbial community which contributed the most to ARGs dynamics as a whole. ZVI-based AD was a promising way for the improvement of methane production coupling ARGs reduction.
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高影响因子
CHEMOSPHERE
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2021
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IF 7.086
Shuxuan Wu,Sheng Deng,Zhifei Ma,Yuhui Liu,Yu Yang,Yonghai Jiang
Zero-valent iron (ZVI), with high reduction capacity and cost effectiveness, has been widely used as an activator for persulfate in remediation of organic pollutants. However, the existence of inherent iron oxide shell blocked the transfer of proton and further reduced its reactivity. In present study, a novel persulfate (PS) activator BZVI@OA was synthesized via ball milling ZVI with oxalic acid dihydrate. Scanning electron microscope , X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectrometry and Time-of-flight secondary ion mass spectroscopy confirmed the original low proton conductive oxidation shell was replaced by a high proton conductive FeC 2 O 4 shell. The generated shell significantly improved persulfate activated capacity, through which degradation rates of various contaminants were enhanced for 1.64 to 2.33 times. Dissolved oxalate was proved to form complexes with iron ions, dramatically reduced the potential difference and relieved the blocked cyclic conversion. Electron paramagnetic resonance and quenching experiments confirmed an inner sphere adsorption of PS on FeC 2 O 4 ·2H 2 O shell which facilitated the peroxide bonds cleavage, leading high efficiency of ROS generation. The accelerated proton transition was confirmed with AC impedance method, resulting in fast and elevated surface bound Fe 2+ for persulfate decomposition into active species. Furthermore, BZVI@OA/PS system demonstrated high tolerance over wide initial pH range and promising reusability within 6 cycles. This work clarifies an effective strategy for developing efficient modified ZVI as a PS activator for organic pollutant degradation in water.
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高影响因子
POWDER METALLURGY
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2022
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IF 2.228
Ying Zhang,Meng Xiao,Yi-min Zhou,Yi-fu Shen
The eutectic FeNiCoCrTi0.6Nb0.4 high-entropy alloy coating (HEAC) is annealed in Argon at 450°C, 850°C and 1050°C to investigate the thermal stability. The results show that annealed coatings are all composed of BCC solid solution and Laves phase with no production of new phases. The fine eutectic cells can be maintained at a higher temperature in that continuous intracellular coarsening does not occur until annealing at 1050°C. With the increase of annealing temperature, the microhardness and wear resistance of FeNiCoCrTi0.6Nb0.4 coating increase first and then decrease slightly. Especially, the microhardness of FeNiCoCrTi0.6Nb0.4 annealed at 1050°C is only 6.03% lower than that of unannealed one, and the wear rate is only 10.70% higher than that of unannealed one, which strongly indicates that eutectic FeNiCoCrTi0.6Nb0.4 HEAC has excellent thermal stability and can be well applied in high-temperature environments.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Hongwei Pang,Lijie Liu,Ziang Bai,Ruixing Chen,Hao Tang,Yawen Cai,Shujun Yu,Baowei Hu,Xiangke Wang
Surface sulfidation has become a desirable technique to enhance the physicochemical properties of nanoscale zero-valent iron (NZVI) and improve the decontamination efficiency for organic pollutants. However, the macroscopic elimination performance and microscopic reaction mechanism of sulfide NZVI (SNZVI) towards organic matters remains uncovered. Herein, we fabricated SNZVI via one-step dithionite-method and applied it for heterogeneous Fenton-like elimination of 2,4-Dichlorophenol (DCP). The sulfidation technique greatly improved the stability, specific area, oxidized resistance, hydrophobicity, and functionality. The efficiency of degradation (86.3%) was approximately 7 times higher than adsorption (12.6%) under N 2 condition, indicating the promising potential of SNZVI in environmental governance. Moreover, Fenton-like reaction and reactive oxygen species (ROS) were confirmed to dominate the degradation process, and the generated radicals had priority to degrade DCP rather than corroded SNZVI. Furthermore, the result of gas chromatography-mass spectrometry (GC–MS) confirmed that DCP was mainly decomposed into harmless alkanes and inorganic matters, which significantly reduced the perniciousness of DCP. Overall, this research bridged the knowledge gap between organic pollutant removal and the advanced oxidation reaction of NZVI-based materials after surface sulfidation.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Yang Zong,Hua Zhang,Yufei Shao,Wenjie Ji,Yunqiao Zeng,Longqian Xu,Deli Wu
Periodate (PI)-based advanced oxidation processes have recently received increasing attentions. Herein, PI was readily activated by nano zero-valent iron (nZVI) and subsequently led to the enhanced oxidation of organic contaminants , with the removal performance of sulfadiazine (SDZ) in the nZVI/PI process even higher than that in the nZVI/peroxydisulfate process under identical conditions. Kinetic experiments indicated that the decay of SDZ was susceptible to the dosage of nZVI and PI, but was barely affected by pH values (4.0–7.0) under buffered conditions, suggesting the promising performance of the nZVI/PI process in a relatively wide pH range. Selective degradation of contaminants and 18 O-isotope labeling assays collectively demonstrated that iodate radical ( • IO 3 ), high-valent iron-oxo species (Fe(IV)) and hydroxyl radical ( • OH) were responsible for the abatement of organic contaminants . More importantly, due to the relatively weak steric hindrance effect of PI, PI easily adsorbed on the surface of nZVI and no iron leaching was detected throughout the reaction, implying that PI activation induced by nZVI was a surface-mediated process. Besides, PI was not transformed into harmful reactive iodine species. This study proposed an environmental-friendly approach for PI activation and shed new lights on the PI-based processes.
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PubMed
高影响因子
WATER RESEARCH
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2021
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IF 11.236
Lin Wang,Tingting Yan,Ruijie Tang,Qian Ping,Yongmei Li,Jie Wang
In this study, nanoscale zero-valent iron (nZVI) was added to motivate the functions of all the reactive oxidation species in peracetic acid (PAA) mixture under ultraviolet (UV) irradiation, and to enhance the removal of spiramycin, which is a typical precursor of N-nitrosodimethylamine (NDMA). Spiramycin (≤ 10 mg/L) could be completely removed within 20 min under the conditions of an initial pH of 4.0, a nZVI dose of 0.02 g/L and a PAA dose of 3.0 mg/L; additionally, 95.8% and 78.8% of PAA and H 2 O 2 were consumed during the process. Electron paramagnetic resonance analysis and quenching experiments confirmed that 52.4% and 44.8% of spiramycin removal was contributed by hydroxyl radical (•OH) and carbon-centered radicals (R-C•), respectively; and Fe 2+ released from nZVI played a critical role in radicals generation. Four degradation pathways of spiramycin were proposed and verified by the density of functional theory analysis. 65.2% of the NDMA formation potential (FP) was reduced after the reaction, and its residual was mainly contributed by the undegraded intermediate of dimethylamine. The results of multiple characterizations and continuous degradation experiments indicated that nZVI was stable in the system as the removal of spiramycin was hardly influenced even if reused three times. The nZVI/UV/PAA process is a promising advanced oxidation technology not only for the removal of refractory NDMA precursors (such as spiramycin) but also for significantly lowering the NDMA FP.
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高影响因子
Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Yanping Zhang,Peng Xiangshi,Jiayu Tian,Fen Li,Xuteng Fan,Liran Ma,Ruijun Zhang
Waste waterworks sludge and walnut shell were employed to synthesize a composite catalyst consisting of Fe 0 /Fe 3 O 4 /biochar using a one-step pyrolysis process . The synthesized catalyst was applied to active peroxymonosulfate (PMS) for studying the degradation of methylene blue (MB). Various characterization results confirmed that Fe 0 and Fe 3 O 4 were distributed on the surface of composite catalyst, which had a porous structure and large specific surface area of 109.87 m 2 /g. Owning to these structural properties, the composite catalyst presented desirable catalytic capability and reusability. When 0.4 g/L PMS and 0.3 g/L composite catalyst were added into the MB solution (pH 7), 99.9% MB could be degraded within 60 min at a high reaction rate of 0.1550 min −1 , which was much better than that of zero valent iron (ZVI)/PMS system. After the three cycles, the catalyst could still maintain an MB degradation of over 68.0%. The free radical quenching experiments and electron paramagnetic resonance experiments demonstrated that SO 4 − ∙ and HO ∙ were generated during the activation of PMS. The X-ray photoelectron spectrometer analysis revealed that Fe 3 O 4 and various functional groups, such as C O were formed on the composite catalyst, and the Fe 2+ was oxidized to Fe 3+ . Furthermore, the iron leaching experiments indicated that both the homogeneous and heterogeneous reactions occurred during the catalysis of PMS using the synthesized composite catalyst. Acidity and higher temperature were conducive to the catalytic reaction . This study offers a green and sustainable route for simultaneously degrading contaminants and reusing wastes.
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高影响因子
危险品化学品经营许可证（带存储）