WATER RESEARCH
·
2024
·
IF 11.4
Zhongmiao Wang,Xintong Lin,Kun Yang,Daohui Lin
Despite the crucial role of photodegradation in the environmental transformation of organic pollutants, the photodegradation process of organic pollutants irreversibly absorbed on biochar colloids (BCCs) remains poorly understood. This study investigated the photodegradation processes and mechanisms of 2,4,4′-trichlorobiphenyl (PCB28) adsorbed on BCCs released from bulk biochars derived from bamboo chips at pyrolysis temperatures of 300, 500, and 700 °C. Results show that BCCs-adsorbed PCB28 could be degraded under simulated solar illumination (95–105 mW·cm −2 ) but at decreased photodegradation rates compared to the dissolved PCB28. The inhibition effect of BCCs on the PCB28 photodegradation increased with increasing pyrolysis temperature. After adsorptive binding to BCCs, the half-life of PCB28 (0.1 mg/L) was prolonged from 2.65 h for the dissolved PCB28 alone in deionized water to 7.48, 40.67, and 81.82 h in the presence of BCC300, BCC500, and BCC700 (5.0 mg/L), respectively. Mechanistically, the photodegradation of adsorbed pollutants was regulated by the photogenerated free radicals and surface functional groups of the low-temperature BCCs, as well as the defects and direct electron transfer capabilities of the high-temperature BCCs; PCB28 adsorbed on the low-temperature BCCs accepted electrons from persistent free radicals under light illumination, which led to PCB28 dechlorination, followed by ring-opening oxidation through hydroxyl radical attack, ultimately resulting in progressive mineralization; singlet oxygen caused preferential ring opening of adsorbed PCB28 on the high-temperature BCCs, preceding dechlorination. The photodegradation of BCCs-adsorbed PCB28 remained significant though more or less being inhibited under the effects of water pH, ionic strength, dissolved organic matters (humic acid and fulvic acid), and in natural water samples. These findings contribute to a better understanding of the structural properties of BCCs that impact phototransformation processes of adsorbed pollutants and facilitate an accurate assessment of the environmental risk associated with biochar application.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2024
·
IF 15.8
Yujin Li,Yu Mei,Yujie Huang,Xue Zhong,Zhenglei Geng,Zidong He,Hanrui Ding,Wentao Deng,Guoqiang Zou,Tongchao Liu,Xiaobo Ji,Khalil Amine,Hongshuai Hou
The carbon coating strategy has emerged as an indispensable approach to improve the conductivity of polyanionic cathodes. However, owing to the complex reaction process between precursors of carbon and cathode, establishing a unified screening principle for carbonaceous precursors remains a technical challenge. Herein, we reveal that carbonaceous precursor pyrolysis chemistry undeniably influences the formation process and performance of Na3V2(PO4)3 (NVP) cathodes from in situ insights. By investigating three types of carbonaceous precursors, it is found that O/H-containing functional groups can provide more bonding sites for cathode precursors and generate a reducing atmosphere by pyrolysis, which is beneficial to the formation of polyanionic materials and a uniform carbon coating layer. Conversely, excessive pyrolysis of functional groups leads to a significant amount of gas, which is detrimental to the compactness of the carbon layer. Furthermore, the substantial presence of residual heteroatoms diminishes graphitization. In this case, it is demonstrated that carbon dots (CDs) precursors with suitable functional groups can comprehensively enhance the Na+ migration rate, reversibility, and interface stability of the cathode material. As a result, the NVP/CDs cathode displays outstanding capacity retention, maintaining 92% after 10,000 cycles at a high rate of 50 C. Altogether, these findings provide a valuable benchmark for carbon source selection for polyanionic cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 11
·A2415
·
IF 3.662
Lei Liu,Xinyu Fu,Guoxu Wang,Kehan Liang,Lili Zhang,Wei Wang,Aibing Chen
Carbon monolith is of particularly great interest in electrochemical applications due to its high surface area, controllable morphology and excellent electronic conductivity. Herein, a novel three-dimensional hierarchically porous carbon monolith (TD-HPCM) was synthesized by a "pyrolysis-capture" strategy. The commercial polyurethane (PU) foam concurrently acted as a template and carbon precursor. Carbonaceous organic gas pyrolyzed from PU foam was captured by mesoporous silica which coated on the branches of PU foam uniformly then converted into carbon under catalysis of Ni species at high temperature. The geometric shape and interconnected network of PU foam were preserved in TD-HPCM, with a large specific surface area (1111 m2 g−1) and uniform mesoporous size (6.7 nm). The TD-HPCM was explored as binder-free electrode in supercapacitors, with capacitance up to 162 F g−1 at 1.0 A g−1 in 6 M KOH electrolyte and favorable capacitance retention (92.7% capacitive retention after 5000 cycles). This strategy provides a controllable, energy efficient and highly repeatable method to prepare TD-HPCM with micro/meso/macroporous structures as binder-free electrodes in electrical double layer capacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Liangqi Zhang,Rui Bao,Jianhong Yi,Shengda Guo,Jingmei Tao,Caiju Li,Dong Fang,Yichun Liu,Fengxian Li
As a hybrid reinforcement, interconnected architecture of carbon nanotubes (CNT)/Tungsten (W) composite powder was designed and fabricated by spraying pyrolysis (SP) method. Subsequently, CNT-W/copper (Cu) composites were fabricated successfully by low energy ball milling (LEBM) and spark plasma sintering (SPS). The electronic conductivity , mechanical properties, micro-morphology and interface microstructure of CNT-W/Cu composites were evaluated and characterized. The results revealed that CNT with attached W were dispersed uniformly in the Cu matrix and W particles played a “pinning” role of the CNT. The 0.6 wt%CNT-W sample exhibited ultimate tensile strength 226 MPa and the elongation 33%, which were 14% and 83% higher than that of pure Cu, respectively. Besides, the 0.8 wt% CNT-W sample exhibited electrical conductivity 92.3%IACS, which is very close to that of Cu matrix (92.6%IACS). Finally, the strengthening and electric conductivity mechanisms of CNT-W in Cu matrix were considered. This study inspires a new way of synergistically reinforced metal matrix composites .
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Liang Shen,Fanfei Min,Lingyun Liu,Jinbo Zhu,Changguo Xue,Chuanchuan Cai,Wei Zhou,Chao Wang
Fossil fuel depletion, environmental concerns, and steep hikes in the price of fossil fuels make it imperative to develop alternative and renewable products to decrease oil products consumption in coal flotation process. Pyrolysis product of the waste cooking oil was proposed as a potential coal flotation collector in this paper. The gas chromatograph-mass spectrometer test and thermogravimetric method were used to study the properties of the waste cooking oil. The pyrolysis product of the waste cooking oil was used as coal flotation collector in two different ways. Thermogravimetric analysis showed that the pyrolysis of the waste cooking oil sample was mainly divided into three processes. The waste cooking oil pyrolysis product possessed strong collecting ability and better selectivity, and can replace diesel as a coal flotation collector. 79% combustible matter recovery was obtained in the presence of 1 kg/Mg DW-450 °C dosage compared with that of 68% in the presence of diesel. Better flotation results can be obtained in the presence of gaseous pyrolysis products of the waste cooking oil. With the increase of pyrolysis temperature of the waste cooking oil, the combustible matter recovery of the concentrate is increasing, while the ash content of the concentrate is showing a decreasing trend.
研究领域:
能源与燃料
·
环境科学
·
矿物加工工程
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Haiping Yang,Shuai Yan,Dingding Yao,Hao Luo,Kuo Zeng,Jun Li,Dian Zhong,Haoyu Xiao,Hanping Chen
A novel photo-thermal catalytic pyrolysis of LDPE was conducted with a solar simulator for effective and energy-conserving production. Four photothermal catalysts, including TiO 2 , NiTi(Ni/TiO 2 ), NiAl(Ni/Al 2 O 3 ) and NiTiAl(Ni/TiO 2 /Al 2 O 3 ), were prepared to study the performance on gas and carbonaceous production at variant temperatures (500 °C, 600 °C and 700 °C). NiTiAl reached carbon nanotubes(CNTs) yield of 280 mg/g plastics with simultaneous hydrogen yield of 54 mmol/g even at 700 °C. For the better understanding of light-induced carbon deposition and hydrogen evolution, pyrolysis in pure thermal mode was also carried out over NiTiAl for comparison, where H 2 production of 28 mmol/g and little carbon product was found. It turns out that the introduction of irradiation together with support component deliberately mediated the metal-support interaction in NiTiAl by certain photoelectrons transfer, which was favorable for CNTs growth and hydrogen evolution. It is expected to provide a design strategy of catalysts in solar pyrolysis of carbonaceous feedstock.
研究领域:
环境科学
·
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Kai Li,Zhu-yu Li,Cheng-Bo Zhang,Jia-qi Zhao,Li Zhao,Ji Liu,Shan-wei Ma,Qiang Lu
This study was focused on the value-increment of spent bleaching clay (SBC) to produce aromatic hydrocarbons and regenerated bleaching clay (RBC) via ex-situ catalytic pyrolysis with HZSM-5. The catalytic pyrolysis experiments were conducted to clarify the regulatory functions of pyrolytic temperature and SBC-to-HZSM-5 ratio (S/H) on the product distribution and aromatics generation. The adsorbed oil in SBC could be decomposed almost completely at 450 °C. The optimum aromatics yield of 3.49 wt% was achieved at catalytic temperature of 600 °C and S/H of 15. The solid product obtained under this condition underwent calcination at 500 °C and acid treatment successively to prepare RBC. The treatment did not affect the montmorillonite structure of clay. The RBC possessed good porous structures with newly generated micropores . The specific surface area and pore volume of RBC reached 163.32 m 2 /g and 0.29 cm 3 /g, higher than those of 146.17 m 2 /g and 0.25 cm 3 /g of fresh activated bleaching clay (ABC), indicating the better adsorption performance of RBC.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Zhenyu Chen,Lu Zhan,Zhenming Xu
Bromine removal is significant in the recycling of waste printed circuit boards (WPCBs). This study found that the critical factors limiting the debromination efficiency of conventional pyrolysis are the formation of coke impeding mass transfer and conversion of bromine into less volatile species, such as coking-Br and copper bromide. According to frontier molecular orbital analysis and thermodynamic equilibrium analysis, C–O bonds of resin are sites prone to electrophilic reactions and copper bromide in residue may undergo hydrolysis; therefore, introducing H2O during pyrolysis was a feasible method for thorough debromination. Through pyrolysis in a water vapor atmosphere, the diffusion limitation of debromination was overcome, and resin was converted into light components; thereby, rapid and deep removal of bromine was achieved. The result indicated that 99.7% of bromine was removed, and the residue could be used as a clean secondary resource. According to life-cycle assessment, pyrolysis of WPCBs in water vapor could be expected to reduce 77 Kt of CO2 emission and increase financial benefits by 60 million dollars, annually.
研究领域:
环境科学
·
化学工程
·
材料科学
·
可持续性
✓ 已验证
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Chunhao Wang,Xiang Xu,Yang Guo,Fan Zhou,Hongyu Chen,Haoyang Li,Zheng Zeng,Liqing Li
The cobalt carbide (Co2C) innovatively prepared from Co–Mn layered double hydroxide (CoMn LDH) has been investigated and evaluated toward its alternative synthesis conditions and different catalytic performances. Along with various characterization techniques, the preparation basically contains four steps (synthesis of CoMn LDH, calcination, reduction, and crystallization) that transform CoMn LDH to CoMn spinel and then to Co2C. Catalyst evaluation toward toluene pyrolysis was conducted. The sample with Co2C exhibited almost 100% conversion rate of toluene, where the resulting hydrogen yield (∼1.8%) is 6 times more than that of the blank test by using silica sand (∼0.3%), realizing the full transfer of hydrogen element from toluene to hydrogen molecule. Furthermore, based on the textural analysis and density functional dispersion correction calculation, which theoretically explained the easy accessibility of toluene to the crystal surface of Co2C(001) with a relatively high adsorption energy (about −280 kJ mol–1), it suggested that Co2C may expand more extensive applications in the field of catalysis.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2022
·Vol. 95
·期 2
·S352
·
IF 0.791
Meng Ying,Lu Shibin,Wu Yaodong,Sun Miao,Lu Haisheng,Zi Zhenfa,Sun Shengjie,Tang Hao
Abstract The porous CoO/MWCNTs and Zn/MWCNTs composites have been fabricated with the wet chemical method and pyrolysis process. For the reason of good impedance matching characteristics, CoO/MWCNTs composites with highly porous structure and dielectric loss properties present exceedingly powerful absorption ability of EM waves, which has a –44.67 dB maximum reflection loss (RL) value at 17.76 GHz at 1.5 mm sample thickness, and the absorption bandwidth below –10 dB is 14.0 GHz (4.0–18 GHz). Moreover, the filling content of the composites into paraffin matrix is merely 10 wt %, which is lower than that of most wave absorbers reported in the past. Consequently, CoO/MWCNTs composites can be used as a potentially lightweight EM wave absorbing material.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 42
·21178-21185
·
IF 9.931
Hao Chen,Xu Shi,Jianfang Liu,Kecheng Jie,Zihao Zhang,Xiaobing Hu,Yimei Zhu,Xiuyang Lu,Jie Fu,He Huang,Sheng Dai
Zeolite materials play a significant role throughout the oil refining and petrochemical industry. Microporous ZSM-5 has a high degree of crystallinity but low mass transfer, while hierarchical ZSM-5 shows a low degree of crystallinity as well as acidity. In this work, we first report the synthesis of ZSM-5 with a new morphological structure, which has nanocrystalline ZSM-5 particles on the surface of an intact ZSM-5 zeolite. This not only improved the mass transfer in microporosity but also overcame disadvantages of hierarchical ZSM-5 including low degrees of crystallinity and acidity. This new and very efficient structure with both intracrystal microporosity and intercrystal macroporosity, formed by secondary crystallization after the intact ZSM-5 zeolite was synthesized, was verified by transmission electronic microscopy, N2 adsorption and desorption, and X-ray diffraction. The obtained ZSM-5 zeolite showed a uniform size (∼200 nm), high crystallinity acidity, and a suitable hierarchical structure that exhibited excellent properties in the catalytic fast pyrolysis of cellulose to produce aromatics.
研究领域:
化学工程
·
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2017
·
IF 4.873
Jian-Fei Huang,Qing-Shan Shi,Jin Feng,Ming-Jie Chen,Wen-Ru Li,Liang-Qiu Li
The incorporation of metallic nanoparticles (NPs) into a biomass-based matrix has been intensively investigated because the obtained nanocomposites exhibited effective antibacterial activity to intractable resistance of bacteria. However, the nanocomposites present limitations, such as a multi-step preparation process and a low loading capacity of nanoparticles . A facile preparation route for the preparation of antibacterial metallic nanocomposites would be especially beneficial for industrial fabrication. In this study, we provided a facile strategy for the preparation of a rosin-derived biochar matrix loaded with silver nanoparticles (Ag NPs) as the fillers. The results demonstrated that the preparation of these rosin-derived biochar silver nanocomposites (Rc/Ag nanocomposites) was achieved by a rapid pyrolysis process and a large amount of Ag NPs were in-situ obtained and homogeneously dispersed on the matrix. More importantly, these materials exhibited satisfying antibacterial activities against E. coli and S. aureus. Thus, the Rc/Ag nanocomposites exhibit promising filler for wooden furniture against bacterial infection and could be used as a filter for indoor antibacterial air filtration .
研究领域:
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）