Journal of Cleaner Production
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2020
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IF 7.246
Jiwen Yang,Guozhao Ji,Yuan Gao,Weng Fu,Muhammad Irfan,Lan Mu,Yulin Zhang,Aimin Li
Adsorptive removal by porous carbon materials has been considered an attractive technique to treat wastewater polluted by antibiotics. To produce porous biochar with high-yield and high-performance for chloramphenicol adsorption, this study prepared biochar from peanut shells using ammonium polyphosphate via pyrolysis . The combined effects of the main process parameters on biochar production were studied to determine the optimum operating conditions by response surface methodology based on Box-Behnken design. Low-dose ammonium polyphosphate has a significant positive effect on the yield, surface functional groups, pore volume, and surface area of biochar. This is caused by the richness of nitrogen and phosphorus in ammonium polyphosphate and its flame retardant property. The high-yield biochar with a surface area of 979 ± 25 m 2 /g was obtained at a mass ratio of ammonium polyphosphate/peanut shell of 0.55, at 650 °C with a retention time of 60 min. The as-prepared biochar exhibited excellent adsorption performance with a monolayer chloramphenicol adsorption capacity of 423.7 mg/g. This was due to the high surface area, micropores formed by nano-sized particles, and richness of N- and P-containing functional groups. The characterization before and after chloramphenicol adsorption indicated micro-pore-filling, Van der Waals force , π-π interaction, and hydrogen-bonding interaction are the main adsorption mechanisms of chloramphenicol adsorption on as-prepared biochar. This study offered new insights on the preparation of biochar from waste biomass for application in wastewater treatment .
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Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 23
·5976-5984
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IF 4.696
Yubin Song,Shoujun Zhu,Shitong Zhang,Yu Fu,Li Wang,Xiaohuan Zhao,Bai Yang
Carbon dots (CDs) are one of the advancing fluorescent materials, which draw increasing attention in both theoretical research and practical applications. However, the clear chemical structure and photoluminescence (PL) mechanism of CDs is still an open debate, which limits the development of CDs. Because of the diversity of CDs, it is highly important to clarify this issue for specific CDs models. Herein, a type of CDs, made from citric acid with extremely high quantum yield, is investigated. Through the separation of the CDs, a type of bright blue fluorophore (IPCA) was discovered. IPCA and its derivatives were investigated and they were proven to contribute to the molecular state PL. Other components in the CDs were related to the carbon core state PL, which included polymer clusters and nanosized carbon cores. We conclude that this type of CDs contained complex components and multiple PL centers and that an independent fluorophore strongly affects the PL properties of the CDs. These two conclusions can potentially be true for similar CDs.
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POLYMER DEGRADATION AND STABILITY
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2015
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IF 3.163
De-Ming Guo,Xiang-Quan Chen,Liang Tang,Jia-Ning Wu,Teng Fu,Xiao-Lin Wang,Xiu-Li Wang,Li Chen,Yu-Zhong Wang
In order to avoid potential environmental and safety problems caused by conventional flame retardants , we synthesized the flame-retardant-element-free copolyesters via chemically incorporating the structural units of bisphenol A and bisphenol F into the PET main chain via melt polymerization, respectively. The chemical structures of resulting copolyesters were confirmed by 1 H NMR and 13 C NMR spectroscopy. Interestingly, though there exists only a small structural difference between bisphenol A and bisphenol F, those two kinds of copolyesters show different thermal stabilities, pyrolysis behaviours and flame retardant performances. Pyrolysis-GC/MS tests were performed to investigate the pyrolysis mechanism of the copolyesters, and the results showed that the “Ar–CH 2 –Ar” structure units (bisphenol F) would lead to rearrangement reactions at high temperature, ultimately forming the phenanthrene ring structures; whereas “Ar–C(CH 3 ) 2 −Ar” structure units (bisphenol A) could not. The corresponding specific pyrolysis processes are proposed. Thermogravimetric analysis (TGA) results indicated that these rearrangement reactions would most likely occur in the solid state of the copolyesters and made them have high residues. Cone calorimeter measurements, LOI and vertical UL-94 tests were used to characterize the flame-retardant properties of the copolyesters, and the results proved that the copolyesters containing bisphenol F had better flame retardancy, more char formation and less melt drippings than those containing bisphenol A due to the rearrangement reactions.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Yunyun Dong,Lin Gu,Chenghuan Wang,Yuchang Du,Wang Bo,Hongmei Du,Yanlan Wang,Jinsheng Zhao
The preparation of non-noble metal catalysts with performance in the oxygen reduction reaction (ORR) comparable or superior to platinum-based catalysts remains challenging. In the present study, hexaazatriphenylenehexacarbonitrile (HAT-CN), which is rich in both cyano groups and pyrazine units, was used as the precursor and then cyclotrimerized into a covalent triazine-based framework with a macrocyclic structure containing abundant complexation sites for transitional metal ions. Subsequently, a series of non-platinum Co N C type catalysts (HAT-CN-Co/C) were prepared, and then pyrolyzed at different temperatures (700 °C, 800 °C, and 900 °C). The pyrolysis treatment endowed the catalysts with activated Co-N x sites, large pore sizes and high specific surface areas, which can promote oxygen transfer and accelerate the ORR catalytic process. It is found that the catalyst (HAT-CN-Co/C-800) obtained from pyrolysis at 800 °C possessed the best ORR activity and followed the four- electrons transfer pathway; the onset potential of ORR was determined as 0.972 V vs reversible hydrogen electrode (RHE), very close to that of Pt/C (0.993 V vs RHE), and the half-wave potential (0.895 V vs RHE) was significantly higher than that of Pt/C (0.859 V vs RHE). Furthermore, the HAT-CN-Co/C-800 catalyst showed good durability (83.2 % current retention after 28000 s) and significant methanol tolerance with good application potential as a substitute for the platinum-based ORR catalyst in fuel cell.
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FUEL
·
2025
·
IF 7.5
Xingping Kai,Lesheng Wang,Tianhua Yang,Wenwen Yan,Zhaowei Liu,Bingshuo Li,Tao Zhang,Rundong Li
The extraction of lignin-derived pyrolysis oils has received much attention as a potential alternative to conventional petroleum-based fuels and chemicals. This study presented a one-step synthesis approach to prepare Fe-Ni bimetallic-modified lignin-based biochar (xFe-yNi/LC) catalysts, and investigated the effects of bimetallic interactions on aromatic hydrocarbon formation and its pathways during the ex-situ catalytic fast pyrolysis of enzymatically hydrolyzed lignin. The results demonstrated that the combination of Fe and Ni not only modified the porous structure of the catalyst but also formed Fe-Ni alloy, regulating the content of Lewis acid sites to enhance aromatic hydrocarbon production. When the catalyst was 20Fe-5Ni/LC, the Lewis acid site content reached a maximum of 38.68 μmol/g. Additionally, the aromatic hydrocarbon content reached a peak value of 19.06 area% when the ratio of lignin to 20Fe-5Ni/LC was 1:2. This represented an improvement of 47.98 % compared to the lignin pyrolysis without the catalyst. The bimetallic catalyst exhibited excellent thermal stability, with the aromatic hydrocarbon content still achievable at 8.66 area% after four cycles of experiments.
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高影响因子
FUEL
·
2025
·
IF 7.5
Zhengzhi Zhang,Honglei Yan,Zhanku Li,Muxin Liu,Jingchong Yan,Weidong Zhang,Zhicai Wang,Zhiping Lei,Shibiao Ren,Hengfu Shui
Understanding the structural characteristics of high-sulfur coking coals is essential for the effective use of high-sulfur coals. In this study, thermal dissolution was employed to separate the Duizhen high-sulfur coking coal (DZ) into an extract (DZE) and a residue (DZR). The influence of the structural differences between DZE and DZR on sulfur migration behavior was further investigated, and the quality of the cokes from co-pyrolysis of DZ with DZE and DZR was evaluated. The results indicate that DZE is rich in aliphatic chain structures and oxygen-containing functional groups, whereas DZR retains a higher content of aromatic matrix and ash. DZE promotes the migration and transformation of sulfoxides and thiophenes by releasing reactive H and enhancing mass transfer. In contrast, the highly aromatic structure of DZR tends to bind with reactive sulfur species, forming stable sulfur-containing compounds, which thereby inhibits the release of H 2 S. Functioning as both a hydrogen donor and a binder modifier, DZE not only enhances synergistic desulfurization during co-pyrolysis but also contributes to improved coke quality. Although DZF also supports desulfurization to some extent, its limited caking properties and elevated ash content adversely affect the structural integrity and overall quality of the resulting coke. This study further explored the synergistic effects occurring during the co-pyrolysis process, revealing how the distinct structural features of the separated fractions influence sulfur migration behavior. This study provides theoretical basis and technical pathways for the clean and efficient conversion and resource utilization of high-sulfur coal.
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高影响因子
FUEL
·
2023
·
IF 7.4
Shanshan Shao,Yu Cao,Zian Ye,Xiaohua Li,Huiyan Zhang,Rui Xiao
This work proposes an effective method for the utilization of agricultural residues and red mud (RM) to produce the carbonyl platform compounds for the synthesis of high-value biofuels. The carbonyl platform compounds were synthesized by catalytic upgrading of pyrolysis vapor from holocellulose over RM composite catalyst. The maximized yield of aldehydes and ketones was obtained with the cellulose-to-hemicellulose mass ratio of 3:2, which was consistent with that of bagasse. Two types of RM were selected for the carbonylation of pyrolysis vapors, in which the type prepared by Bayer process containing more Fe 2 O 3 exhibited better carbonylation performance. The ZrO 2 -loaded RM composite catalyst was prepared, and it was found that the yield of aldehydes and ketones was greatly boosted. Finally, RM composite catalysts supported by five individual metal oxide were prepared, the correlation between the oxidizability of catalyst and the aldehyde/ketone mole ratio was established, and it was revealed that the stronger oxidizability of the composite catalysts was usually accompanied with the decreased aldehydes/ketones mole ratio. Biomass and RM wastes were used as resources in this study, this waste-to-energy idea contributes to optimizing the utilization of waste and promoting the production of biofuels.
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Processes
·
2022
·Vol. 10
·期 4
·618
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IF 3.352
Qing Guo,Hongmei Tang,Lu Jiang,Meiqing Chen,Nengwu Zhu,Pingxiao Wu
In this study, bone char pretreated with hydrogen peroxide and traditional pyrolysis was applied to remove Cd2+from aqueous solutions. After hydrogen peroxide pretreatment, the organic matter content of the bone char significantly decreased, while the surface area, the negative charge and the number of oxygen-containing functional groups on the bone char surface increased. After being pyrolyzed, the specific surface area and the negative charge of the material were further improved. The adsorption kinetics and isotherms of Cd2+adsorption were studied, and the influence of solution pH and the presence of ionic species were investigated. The experimental results showed that the samples with lower crystallinity exhibited less organic matter content and more surface oxygen-containing functional groups, resulting in stronger adsorption capacity. After being treated with hydrogen peroxide and pyrolyzed at 300 °C, the maximum adsorption capacity of bone char was 228.73 mg/g. The bone char sample with the lowest adsorption capacity(47.71 mg/g) was pyrolyzed at 900 °C without hydrogen peroxide pretreatment. Ion exchange, surface complexation, and electrostatic interactions were responsible for the elimination of Cd2+by the bone char samples. Overall, this work indicates that hydrogen peroxide-treated pyrolytic bone char is a promising material for the immobilization of Cd2+.
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CHROMATOGRAPHIA
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2024
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IF 1.2
Huang Zhongping,Wu Ermiao,Shi Dongliang,Zhang Jingkun,Shen Zhenlu,Zheng Ruixing,Shen Jian
The quantification analysis of microplastics (MPs) in bottled water, purified tap water and branded table salt was executed by double-shot pyrolysis–gas chromatography/mass spectrometry (Py–GC/MS), and the concentration was expressed as a mass concentration, which was more suitable for the data comparison. MPs including polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polycarbonate (PC), polypropylene (PP), polystyrene (PS) and polyethylene (PE) were separated by filtration with glass fiber filter membranes. After being folded, the whole glass filter membrane containing MPs was transferred into a pyrolysis cup directly to avoid the sample loss during transfer. The characteristic pyrolysates were used to identify and quantify PMMA, PET, PC, PP, PS and PE. The linear relationships were found between the polymer weight amount and peak areas of each characteristic pyrolysates with the correlation coefficients larger than 0.993. The intra-day precisions of the pyrolysates for peak areas were 0.56–18.94%, and the inter-day variability was 8.47–19.88%. The recovery values of the spiked standards were in a range of 81.5–114.5%. MPs in bottled water, purified tap water and branded table salt samples were successfully quantified by the proposed Py–GC/MS method. For four brands of bottled water samples, 0.088 μg/L PET was found in one sample. PP was detected in all purified tap water samples from five brands with the concentrations between 0.028 and 0.489 μg/L, and PE was detected in purified tap water samples from two brands with the concentrations between 0.194 and 1.26 μg/L. As for nine table salt samples, PP were found in a range of 4.00–182.80 μg/100 g salt in eight table salt samples. Due to the high content of MPs in purified tap water samples and large daily consumption, the estimated daily intake (EDI) of MPs from purified tap water was calculated. The estimated daily intakes (EDIs) for adults are 2.57 ng PP/kg/d and 4.17 ng PE/kg/d from purified tap water; the EDIs for children are 5.63 ng PP/kg/d and 9.11 ng PE/kg/d from purified tap water.
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高影响因子
ENERGY
·
2024
·
IF 9
Yuxuan Xing,Jingchun Huang,Zhenqi Wang,Wei Hu,Minghou Xu,Yu Qiao
This study focused on the effect of oxygen (0–15 %) and 5 % CaO addition on the organic-S control and transformation behavior during pyrolysis (400–600 °C) of sludge under the conditions relevant to smoldering combustion. The results show that oxygen inhibits the total emission of gaseous sulfur (decreased by 25.6–36.9 %). At low temperatures (<500 °C), oxygen enhances the oxidation of aliphatic-S, aromatic-S/thiophene-S, and sulfide-S, leading more sulfur retains in the form of sulfone-S and sulfate-S in char products, also migrates to water-soluble products (especially sulfone-S). At high temperatures (>500 °C), the formed sulfur species in char products mainly further decompose into water-soluble sulfone-S, and partially generate SO 2 . After the addition of CaO during oxidative pyrolysis, the synergistic promotion effect on the sulfur fixation in char products is found, mainly due to the generation of more amount of stable sulfone-S and sulfate-S in char products. This leads to a decrease in gaseous sulfur by 12.4–14.6 % and an increase in sulfur content of char products by 31.3–202.9 %.
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FUEL
·
2024
·
IF 6.7
Guozhang Chang,Shanshan Dai,Huifen Kang,Jie Li,Yong Liu,Jian Zhang,Qingjie Guo
Limited knowledge regarding the controlled preparation of aromatic hydrocarbons (AHs) via catalytic pyrolysis of individual organic components hinders high yields of lignocellulosic biomass-based AHs. This report describes a systematic investigation of AHs generation following catalytic pyrolysis of organic components referring to cellulose, xylan, and lignin. Results show that in a programmed-heating process (20 °C/min), a (Ca-Fe)/HZSM-5 catalyst promoted the degradation of cellulose, xylan, and lignin with respective increment ratios of 24.56 %, 17.29 % and 19.45 %, and significantly increased the release of benzene during the pyrolysis of cellulose and xylan. In a fast-heating process (20 °C/ms), Ca-Fe alone presented a positive effect on bio-oil yield from cellulose, whereas HZSM-5 and (Ca-Fe)/HZSM-5 afforded high bio-oil yields from all three components. Notably, Ca-Fe and HZSM-5 exhibited synergistic effects on the bio-oil and AHs yields following cellulose pyrolysis, and on AHs yield following xylan pyrolysis. Alcohols, aldehydes, and furans were suitable precursors for generating AHs via pyrolysis of both cellulose and xylan. Lignin conversion to AHs involved various potential reaction pathways, including dehydration-deoxygenation-aromatization and dehydration-hydrodeoxygenation. The orders of (Ca-Fe)/HZSM-5 catalyzed pyrolysis of individual components towards AHs generation were xylan > cellulose > lignin. The presence of Ca-Fe particles inhibited deactivation of HZSM-5 in pyrolysis of a cellulose/xylan/lignin mixture.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Zhen Sun,Maonan Ran,Guan Zhang
Solar-driven photocatalytic water splitting for hydrogen production is gaining dramatic interests, however, efficiencies are still not satisfied to make it technically applicable in large scale. Herein, we have observed unconventional high-temperature effects on the change of intrinsic photophysical properties of semiconductors, and demonstrated dual synergistic photothermal effects in promoting hydrogen evolution from water reduction and cellulose pyrolysis at high temperature with metal oxides catalysts. Particularly, Zn/ZnO species deposited TiO 2 (Zn-TiO 2 ) catalyst showcased exceptional thermal-assisted photocatalytic H 2 production from water reduction along with cellulose decomposition at 573 K with quasi apparent quantum efficiency of nearly 100 % under 365±10 nm irradiation and solar to hydrogen (STH) efficiency of 2.72 %. In situ spectroscopic characterizations at 573 K corroborated that the absorption spectrum of Zn-TiO 2 could be extended into the near-infrared region (beyond 1200 nm), and electron-hole pair recombination is curbed and migration of photogenerated charge carriers within the catalyst is remarkably promoted at high temperature. In addition, experimental analysis and molecular dynamics simulations unraveled the synergistic photo-assisted thermal effects for cellulose pyrolysis, and delineated potential pathways for cellulose conversion at high temperature under light irradiation. This work paves the way for efficient utilization of whole solar spectrum for achieving sustainable water splitting and biomass waste utilization.
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高影响因子
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