CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Kangmeng Zhu,Xisong Wang,Mengzi Geng,Dong Chen,Heng Lin,Hui Zhang
Wood-based biochars were fabricated at different pyrolysis temperatures of 400–700 °C and used to activate peroxydisulfate (PDS) for the degradation of clofibric acid (CA). Biochar pyrolyzed at 700 °C (BC700) showed more excellent catalytic performance toward CA removal (97.8% in a 60 min reaction) than other BCs. The BC700/PDS process performed efficiently at initial pH range of 4.0–9.0. The effects of PDS concentration and BC700 dosage on CA removal were also examined. Radical quenching experiments and electron paramagnetic resonance (EPR) spectra were applied to identify the reactive radicals generated in the BC700/PDS system. The role of persistent free radicals (PFRs), oxygen functional groups and π-π * transitions in aromatic rings of BC700 for the PDS activation was explored. The reaction intermediates of CA were identified by liquid chromatography–mass spectrometry (LC–MS) and the corresponding degradation pathway was proposed. This study contributes to the development of green materials for sustainable remediation of organic contaminants in water and provides support for further studies.
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 3
·750-757
·
IF 2.726
Zhang Ziqi,Wang Hanbo,Li Yuxin,Xie Minggang,Li Chunguang,Lu Haiyan,Peng Yu,Shi Zhan
Hydrogen is one of the most desirable alternatives to fossil fuels due to its renewability and large energy density. Electrochemical water splitting, as an environmental-friendly way to produce H 2 of high-purity, is drawing more and more attention. Conductive nitrogen-doped carbon frameworks derived from metal-organic frameworks(MOFs) have been applied as promising electrocatalysts thanks to their superior conductivity, numerous active sites and hierarchical porous structures. However, traditional uncontrolled pyrolysis will lead to aggregation or fusion of the metal sites in MOFs or even cause collapse of the three-dimensional structures. Herein, we provide a confinement pyrolysis strategy to fabricate a CoCu bimetallic N-doped carbon framework derived from MOFs, which exhibits satisfactory catalytic performance with overpotentials of 199 mV towards hydrogen evolution reaction and 301 mV towards oxygen evolution reaction to reach 10 mA/cm 2 in an alkaline solution. This work presents further inspirations for preserving the original skeleton of MOFs during high temperature pyrolysis in order to obtain more stable and efficient electrocatalyst.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Wenjun Wu,Jiuhong Wei,Shihua Zheng,Jun Liu,Guojie Zhang,Ying Wang,Huihui Wang,Guoqiang Li,Yuqiong Zhao
The combustion of fossil fuels has led to excessive CO 2 emissions and severe climate impacts, making efficient CO 2 capture an urgent priority. Although chemical activation can enhance the CO 2 adsorption performance of biochar, its extensive use often entails environmental, equipment, and cost challenges. In this study, we present an innovative bio-templating strategy to synthesize hierarchically porous, heteroatom-enriched biochars derived from waste bamboo shoot shells and starch, using K 2 CO 3 as an activator and yeast as the bio-template. This method significantly reduces activator consumption compared with conventional activation processes. The optimized biochar, BAS 0.5 KC-800, exhibited exceptional CO 2 adsorption capacities of 5.15 mmol/g at 0 ℃ and 3.38 mmol/g at 25 ℃. Structural analysis revealed that its high specific surface area (1186 m 2 /g) and micropore volume (0.55 cm 3 /g) provide abundant CO 2 adsorption sites. Furthermore, the bio-templating process successfully introduced N and O heteroatoms into the carbon framework. These functional groups enhance the affinity between biochar and CO 2 through electronic interactions, ensuring excellent adsorption stability over multiple adsorption–desorption cycles. Isotherm and kinetic analyses indicate that CO 2 adsorption proceeds via a multilayer diffusion-controlled mechanism. Moreover, density functional theory (DFT) calculations reveal that N dopants facilitate CO 2 capture through hydrogen bonding, whereas O atoms strengthen dipole–quadrupole interactions. Overall, this study presents a sustainable and cost-effective approach to produce high-performance CO 2 adsorbents from waste biomass and provides comprehensive mechanistic insights into how heteroatom doping promotes CO 2 capture efficiency.
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产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 5
·2533-2550
·
IF 1.843
Chen Wei,Bao Zhichang,Zhou Zhiming
A series of non-precious bimetallic NiM x /SiO 2 (M = Zn or Co) catalysts with a fixed Ni loading of 5 wt% and different molar ratios of M/Ni (0.004–1.97) were prepared by glucose pyrolysis and applied to the selective hydrogenation of phenylacetylene. The properties of the catalysts were characterized by N 2 physisorption, CO chemisorption, ICP-OES, TGA, XRD, HRTEM, XPS, and DRIFTS. The activity and selectivity of the bimetallic catalysts could be tuned by varying the Zn/Ni and Co/Ni molar ratios, which were almost independent of the metal particle size (with a similar size of 4.1–5.5 nm), but predominantly determined by the geometric and/or electronic effects of the catalysts. Among all the catalysts studied, NiZn 0.05 /SiO 2 and NiCo 0.09 /SiO 2 presented higher selectivity to styrene (86.3% and 88.0%, respectively) at above 99% conversion of phenylacetylene. The high selectivity of the former was attributed to the geometric and electronic effects of the Ni–Zn alloy, while the latter was due to the geometric effect caused by the addition of Co. The activity and selectivity of NiCo 0.09 /SiO 2 were maintained during six consecutive cycles, indicating its good stability in the selective hydrogenation of phenylacetylene.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Qiaoyan Shang,Jifa Xiao,Yan Li,Wenge Liu,Xiaojuan Liu,Guanwei Cui,Xifeng Shi,Shuqian Xia,Bo Tang
Biomass pyrolysis oil is considered to be a promising alternative to fossil energy for the synthesis of high value-added chemicals and fuels. 2-Methoxy-4-methyl phenol (MMP), 4-ethylphenol (EP), 3,5-dimethylphenol (DMP), and m-Cresol (MC) are the important phenolic compounds in pyrolysis oil. The investigation of phase equilibrium is crucial to design separation processes. In this work, the isobaric vapor–liquid equilibrium (VLE) experiment, correlation, and estimation of binary systems (cyclohexane + MMP/EP/DMP/MC) were investigated. The experimental data were verified by the Herington test and van Ness test, and all were thermodynamically consistent entirely. The binary energy interaction parameters were obtained by correlating the experimental data using NRTL, Wilson, and UNIQUAC activity coefficient models. The average absolute relative deviations (ARD %) of T, x1, and y1 correlated by NRTL, Wilson, and UNIQUAC models for four binary systems are below 0.2. In addition, the VLE data were correlated and estimated by the UNIFAC-DMD model. The new interaction parameters of the C–CH2 group in the UNIFAC-DMD model were obtained and used to estimate cyclohexane + DMP systems. The ARD % of T and y1 for cyclohexane + DMP systems were 1.02 and 0.43, respectively. The estimation accuracy of UNIFAC-DMD with new parameters was significantly improved.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Ge Zhu,Mengran Gao,Kejun Bi,Shanshan Zhao
The magnetic biochar is prepared for ciprofloxacin removal by adsorption, photocatalytic degradation and activation peroxodisulfate degradation. The magnetic biochar contains the ZnO, Fe 3 O 4 and FeNi with abundant pore structure, based on characterization analysis. According to Langmuir model analysis, the adsorption amount of ciprofloxacin is 505.16 mg/g. The adsorption mechanism analysis indicates that the surface functional group of magnetic biochar contributes to ciprofloxacin removal from wastewater. The magnetic biochar can be used as the photocatalyst for photocatalytic degradation of ciprofloxacin with removal of the 99.43 %. The ciprofloxacin can be also removed in the activation peroxodisulfate degradation system by reactive oxygen species. The magnetic biochar has excellent reusability in ciprofloxacin removal process. Bio-oil and bio-gas are produced by recycling of pyrolysis gas in the magnetic biochar preparation process. The bio-oil and bio-gas are rich in furfural and H 2 , respectively. Besides, the heating value of bio-gas is 12.35 MJ/Nm³.
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DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Liqiang Zhang,Ningmin Zhu,Chaochao Wang,Rongzheng Cui,Riyi Lin
Two-step catalytic pyrolysis of Nannochloropsis sp (NS) was conducted with SBA-15 and ZSM-5. Thermogravimetric analyzer (TG) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) were used to investigate the effects of SBA-15 and ZSM-5 on the two-step pyrolysis of NS. The comparative study showed that ZSM-5 and SBA-15 had different effects on the pyrolysis characteristic of NS because of their different property. ZSM-5 had no effects on the kinetic mechanism, but SBA-15 obviously changed DTG curves and the reaction order of the low temperature pyrolysis stage. SBA-15 increased the contents of amines and alkanes to 19.40% and 5.62% in the first step compared with those of the one-step pyrolysis (1.95% and 1.83%). Due to the stronger acid sites, ZSM-5 improved the content of olefins (33.79%) and esters (10.79%) in the first step and the contents of nitriles (11.75%) and aromatic hydrocarbons (31.01%) in the second step compared with those of one-step pyrolysis (10.61%, 5.41%, 0.00%, 8.42%). Acid catalyst had no positive effects on the generation of N-heterocyclic compounds. This study is expected to provide a reference for the efficient pyrolysis utilization of microalgae.
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高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2024
·
IF 5.3
Wen-luan Xie,Bin Hu,Xiao Yang,Ji Liu,Zhi-mo Fang,Kai Li,Yang-wen Wu,Bing Zhang,Qiang Lu
Phosphoric acid is an effective and widely used catalyst for biomass pyrolysis, with significant catalytic impact on the pyrolytic reactions and product distribution. However, its fundamental catalytic mechanism in lignin pyrolysis remains unclear. In this work, we proposed and investigated three possible H 3 PO 4 -assisted pyrolysis mechanisms, i.e., hydrogen-bond-induced decomposition, phosphoric-acid-assisted hydrogen transfer (H 3 PO 4 -AHT), and phosphorolysis, and carefully discussed them through theoretical calculations, electronic structure analyses, catalytic pyrolysis experiments using the β -O-4 linked lignin model. The results indicated that the H 3 PO 4 -AHT mechanism played a dominant role in lignin catalytic pyrolysis, superior to the other two mechanisms. The phosphoric acid molecule could take advantage of its unsaturated P = O and saturated P −OH groups for hydrogen donation and acceptance in concerted H 3 PO 4 -AHT reactions. Alternatively, it could also participate in concerted intermolecular hydrogen transfer with the active hydroxyl group as a mediator. The C β −O bond cleavage could be significantly enhanced by effectively reducing the tension of the transition state ring, leading to the generation of more phenol and styrene in pyrolysis experiments. Due to the inhibition of hydrogen abstraction, C α −C β breakage of β -O-4 linkage, side chain removal of primary products, etc., the formation of other products in phosphoric acid catalytic pyrolysis of β -O-4 linked lignin was restrained. This H 3 PO 4 -AHT catalytic mechanism was also confirmed to be conductive to tautomerism, elimination, dehydration, α -O-4 linkage fracture, β -1 linkage fracture, and other important decomposition reactions in lignin pyrolysis. The understanding of these mechanisms provides valuable insights into the role of phosphoric acid in lignin pyrolysis and may guide the development of effective biomass catalytic conversion methods.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Yanlong Jia,Mengyan Wang,Bolun Li,Jiang Liu,Xueping Song,Min Wu,Yongjun Yin
To solve the long-term environmental pollution caused by black liquor and waste plastics, and achieve high-value utilization, the method about co-pyrolysis of black liquid solid and waste plastics (Polypropylene, Polyethylene) catalyzed by Mo-Ni/HZSM-5 to prepare high-quality bio-oil is studied. The results found that hydrocarbons increased from 14.92% to 42.03% as Polyethylene was co-pyrolyzed with BLS, and hydrocarbons increased from 14.92% to 41.75% as Polypropylene was co-pyrolyzed with BLS, adding plastics can significantly improve the hydrocarbons yield of black liquor. Mo-Ni/HZSM-5 acts as a hydro deoxidizer in the pyrolysis of black liquid and waste plastics, the total hydrocarbons of black liquid solid, black liquid solid& Polypropylene, black liquid solid & Polyethylene increased by 6%, 78%, and 45%, respectively. An appropriate increase of pyrolysis temperature can promote the co-pyrolysis of BLS with PP, and BLS with PE, and can increase the yield of hydrocarbons. Compared with black liquor’s pyrolysis, the yield of hydrocarbons can be increased by 59.65% and 24.52% as Polyethylene or Polypropylene is adapted to pyrolysis with black liquid solid, respectively, the high-quality bio-oil is obtained because of a large number of hydrocarbons and high hydrogen content.
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高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Yuexia Zhang,Chaoying Gui,Xuyan Cui,Quanxi Zhang,Xianyun Zheng,Xuansen Sun,Zhenhua Yang,Chuan Dong
In this study, citric acid-based N-doped carbon dots (N-CDs) were rapidly synthesized via open pyrolysis. A facile extraction strategy was proposed to promote the separation of N-CDs by orderly addition of toluene and water. The prepared N-CDs exhibited a high quantum yield (0.53) and excellent dispersibility in solvents of various polarities. The bright blue N-CDs were applied as a fluorescence sensor for ciprofloxacin (CIP) detection due to inner filter effect (IFE) and static quenching. The N-CDs sensor exhibited a good two-phase linear relation with CIP with a low detection limit of 0.14 µM. The sensing platform for CIP detection in milk and eye drops was further developed successfully, indicating its potential for CIP detection in real samples. N-CDs-based fluorescent ink was also prepared for anti-counterfeiting. Furthermore, the polyvinyl alcohol/N-CDs film had comparable bright fluorescence with ∼80 % color purity, which further expands the application of N-CDs as photovoltaic materials. The extraction strategy of using different-polarity solvents may open a new way for preparing amphipathic nanomaterials.
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高影响因子
FUEL
·
2024
·
IF 6.7
Yuxin Wen,Zhixian Bao,Zhengzheng Liu,Dekang Li,Haoquan Hu,Lijun Jin
Pyrolysis of waste tire (WT) is an efficient method to convert it into fuels and high-value chemicals. However, the main organic components of tire including natural rubber (NR), styrene butadiene rubber (SBR) and butadiene rubber (BR) usually exert interaction during pyrolysis . To investigate the interactions between different rubbers, individual pyrolysis and co-pyrolysis of three pure rubbers were conducted using an infrared-heating fixed-bed reactor, and the synergy during co-pyrolysis was revealed based on products distribution, tar quality and compositions from pyrolysis of pure rubber and waste tire. The results show that tar yields from rubber pyrolysis exceed 90 wt% and tar compositions are related to the molecular structures of rubbers. Co-pyrolysis between different rubbers promotes gases formation and inhibits char formation. The interaction between NR and SBR facilitates the formation of cycloolefin and chain olefin , but co-pyrolysis of SBR and BR contributes to the aromatic hydrocarbons formation. Similar tar components from pyrolysis of demineralized waste tire as those from pyrolysis of NR/SBR/BR sample indicate that waste tire pyrolysis contains individual pyrolysis and co-pyrolysis of different rubbers. The potential reaction process of WT was also proposed. The insight on interaction between different rubbers will provide a good guide for efficient pyrolysis of waste tire.
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高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Naiyu Wang,Jiebing Ai,Xiaotong Feng,Zhaowei Qu,Wei He,Xiaoqin Ma,Qiaosheng Pu
Combination of pyrolysis and microwave plasma treatment was utilized to prepare porous carbon materials using an industrial tar waste as the precursor. The results show that the treatment with microwave plasma can significantly enhance the specific surface area and pore volume of carbon prepared through pyrolysis. The specific surface area increased by 14.8 % (2419.6 m 2 g −1 to 2778.8 m 2 g −1 ) and the pore volume increased by 23.5 % (1.15 cm 3 g −1 to 1.42 cm 3 g −1 ) through only 1.5 min treatment with 1060 W of microwave plasma. The waste-derived porous carbon could be used as the electrode material of the supercapacitor and the specific capacitance enhanced by 67.9 % (178.4 F g −1 to 299.6 F g −1 at 1 A g −1 ) by the plasma treatment. The specific capacitance of the plasma treated carbon remained nearly same after 12,000 cycles of charging and discharging. In addition, due to its unique structure, the plasma treated carbon could completely eliminate methylene blue within 6 h without the use of other chemical activators, indicating its capability of waste water treatment. The work illustrates the potential of microwave plasma for activating the surface of porous carbon and provides a way to convert industrial wastes to high value materials.
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PubMed
高影响因子
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