Journal of Environmental Sciences
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2020
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IF 4.302
Junxiang Guo,Yuran Li,Jin Xiong,Tingyu Zhu
To clarify the effect of coking dust, sintering dust and fly ash on the activity of activated carbon for various industrial flue gas desulfurization and denitrification, the coupling mechanism of the mixed activated carbon and dust was investigated to provide theoretical reference for the stable operation. The results show that coking dust had 34% desulfurization efficiency and 10% denitrification efficiency; correspondingly, sintering dust and fly ash had no obvious desulfurization and denitrification activities. For the mixture of activated carbon and dust, the coking dust reduced the desulfurization and denitrification efficiencies by blocking the pores of activated carbon, and its inhibiting effect on activated carbon was larger than its own desulfurization and denitrification activity. The sintering dust also reduced the desulfurization efficiency on the activated carbon while enhancing the denitrification efficiency. Fly ash blocked the pores of activated carbon and reduced its reaction activity. The reaction activity of coking dust mainly came from the surface functional groups, similar to that of activated carbon. The reaction activity of sintering dust mainly came from the oxidative property of Fe 2 O 3 , which oxidized NO to NO 2 and promoted the fast selectively catalytic reduction (SCR) of NO to form N 2 . Sintering dust was activated by the joint action of activated carbon, and both had a coupling function. Sintering dust enhanced the adsorption and oxidation of NO, and activated carbon further promoted the reduction of NO x by NH 3 ; thus, the denitrification efficiency increased by 5%-7% on the activated carbon.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Wanting Zou,Wenhua Zhang,Yilin Pi,Yunsheng Zhang,Yuan Chen,Lei Zhang
Solid wastes, such as municipal solid waste incineration fly ash (MSWI FA) and tailings, contain a large number of harmful components, which makes harmless and recycling treatment a challenge. Through high-temperature reconstruction, the solid waste containing heavy metals is prepared into glass-ceramics, which is an effective method to realize the harmless and resource utilization of solid waste. In this work, glass-ceramics were successfully prepared by using MSWI FA, waste glass, and lead-zinc tailings. The utilization rate of solid waste reached 91.74%. The coupling mechanism of heavy metals with Fe as the dominant factor and Zn, Cu, and Pb coexisting was explored. The results showed that the critical threshold of sintering temperature was 1000 °C. The properties of glass-ceramics can be greatly optimized when the temperature was higher than 1000 °C. Fe played a leading role in the migration and solidification process. Because of its higher displacement capacity, Fe was preferentially solidified in the form of hedenbergite and magnetite. Zn, Cu, and Pb solidified in the form of (Mg,Fe,Zn,Cu)Fe 2 O 4 and Pb 2+ respectively. The order of stabilization effect was Fe > Zn > Cu > Pb. All leaching concentrations of heavy metals were lower than the standard threshold, even if the heavy metals reached 20 wt%.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2013
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IF 2.596
De zhan Ye,Ming hua Zhang,Ling ling Gan,Qi ling Li,Xi Zhang
In order to improve lignin-based materials’ utilization, the grafting mechanism of lignin was studied by investigating hydrogen peroxide (H 2 O 2 ) initiator's effect on the structure of eucalyptus lignosulfonate calcium (HLS). HLS was treated by low content of H 2 O 2 (H 2 O 2 /HLS wt = 1%, 2%, 4%) under various reaction temperature and time. Changes in HLS structure were investigated by difference UV, UV, FTIR, 1 H NMR, GPC and intrinsic viscosity. The results showed that though phenolic hydroxyl group (Ph-OH) of HLS was not oxidated to the quinoid structure, its content still decreased after treated by H 2 O 2 initiator. Meanwhile, the new aryl–alkyl ether structures and increased average molecular weight were observed. A radical coupling mechanism for the decreasing Ph-OH group's content was proposed, which radicals may terminate between phenoxy and benzyl radicals. In addition, the cleavage of methoxyl-aryl ether made a decline in the content of syringyl units, while that of guaiacyl, p -hydroxyphenyl units and free aromatic C-5 hydrogen increased when HLS reacted with H 2 O 2 .
研究领域:
林产化学与工业
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材料科学
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DOI
PubMed
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Yongjun Shen,Yunli Wang,Kaixia Fan
ABSTRACT Acid turquoise blue A (ATBA) is treated by the combined dielectric barrier discharge (DBD) plasma and AC supported CuO (CuO/AC). CuO/AC is prepared by incipient wetness impregnation method. X-ray diffraction, N 2 adsorption/desorption isotherm, and scanning electron microscope are used to characterize the CuO/AC. Interactive effects of initial pH, conductivity value, input power, and CuO/AC dosage on the decolorization rate of ATBA are investigated. The predicted decolorization rate of ATBA reaches to 97.12% under the optimal condition, only have 1.95% error compared with the experimental value (95.87%). The possible coupling mechanisms of combined DBD plasma and CuO/AC are proposed.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2025
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IF 7.3
Jialing Luo,Suling Wei,Yufeng Xie,Junlang Qiu,Xiaolin Niu,Na Luo,Yanpeng Gao,Yuemeng Ji,Taicheng An
The widespread use of chloramination as a disinfection strategy has raised concerns about the formation of harmful disinfection byproducts (DBPs), highlighting the urgent need to elucidate the underlying transformation mechanisms. In this study, we integrated non-targeted screening, organic synthesis, and quantum chemical calculations to investigate the chloramination mechanism of preservative methylparaben and assess the toxicological impacts of the resulting DBPs. In addition to chlorinated products, two novel transformation products, the coupled (C-MeP) and hydroxylated (OH-MeP) products were identified, and the structure of C-MeP was confirmed through synthesized standards. Quantum chemical calculations reveal that the formation of C-MeP is driven by electron transfer, generating radicals that promote C-C bond coupling, while OH-MeP is likely formed by an addition-hydrolysis pathway. The formation of chlorinated products occurs through electrophilic substitution, facilitated by water molecules, and may undergo coupling to form chlorinated products with a biphenyl structure. Toxicity assessments indicate that coupled products exhibit greater negative effects on the gastrointestinal and cardiovascular system compared to parent pollutant. These findings highlight the need to expand the focus of chloramination disinfection beyond traditional chlorinated DBPs, emphasizing the ecological and health implications of novel products including coupled byproducts.
研究领域:
环境科学
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毒理学
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计算化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Catalysis
·
2025
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IF 13.1
Yang Chen,Diwen Zhou,Yongli Chang,Yunzhao Xu,Hongqiao Lin,Lizhi Wu,Yu Tang,Chengyi Dai,Xingang Li,Lisheng Guo,Ting Qiu,Li Tan
The utilization of Rh-based catalysts in the direct production of ethanol from CO2 has been a subject of significant interest. However, to date, the precise active sites responsible for ethanol generation and the C–C coupling mechanism remain elusive. In this study, we present a Rh-based catalyst featuring nanoscale Rh–Fe alloy sites, which achieved an ethanol selectivity of 49.1% among all hydrocarbon and oxygenate products (CO excluded) under relatively mild reaction conditions (3.0 MPa, 200 °C, with a low metal loading of ≤1 wt %). The formation of ethanol proceeds via the HCOO* pathway with a CO insertion mechanism occurring at the alloy sites with a specific cluster size, where CH2* and CO* act as the crucial intermediates for C–C coupling. The electron interaction within the Rh–Fe alloy sites effectively reduces the energy barrier for the formation of the CH2CO* intermediate, thereby facilitating the production of ethanol. In contrast to the Rh–Fe alloy sites, the geminal-dicarbonyl binding configuration of CO* intermediates on Rh single sites favors the generation of byproducts such as methane and methanol, rather than ethanol. This research offers insights into the active sites and reaction mechanism of hydrogenation of CO2 to ethanol, thus enhancing the efficient utilization of Rh-based catalysts.
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2022
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IF 8.431
Jin Zhang,Hao Yu,Weijian Xu,Hongyu Shi,Xiaohong Hu,Jiang Xu,Liping Lou
Sulfidized nanoscale zerovalent iron (S-nZVI) was a promising material for degrading halogenated contaminants, but the easy aggregation limits its application for in-situ groundwater remediation . Hence, S-nZVI was decorated onto modified biochar (mBC) to obtain better dispersity and reactivity with florfenicol (FF), a widely used antibiotic. Uniform dispersion of S-nZVI particles were achieved on the mBC with plentiful oxygen-containing functional groups and negative surface charge. Thus, the removal rate of FF by [email protected] was 2.5 and 3.1 times higher than that by S-nZVI and [email protected] , respectively. Adsorption and dechlorination of FF showed synergistic effect under appropriate mBC addition (e.g., C/Fe mass ratio = 1:3, 1:1), probably due to the enrichment of FF facilitates its reduction. In contrast, the contact between FF and S-nZVI could be hindered under more mBC addition, significantly decrease the reduction rate of FF and the reduction capacity of per unit Fe 0 . In addition, sulfur dose altered the surface species of surface Fe and S, and removal rates of FF correlated well with surface reductive species, i.e., FeS ( r = 0.90, p < 0.05) and Fe 0 ( r = 0.98, p < 0.01). These mechanistic insights indicate the importance of rational design for biochar supported S-nZVI, which can lead to more efficient FF degradation.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
✓ 已验证
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2024
·Vol. 70
·期 9
·e18497
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IF 3.5
Jiacheng You,Jiangping Chen,Shunli Liu,Huihuang Fang,Fulan Zhong,Yu Luo,Lilong Jiang
The protonic ceramic fuel cells (PCFCs) can convert the chemical energy of fuel directly into electric power, with the advantages of high efficiency and alternative fuel range at intermediate temperatures. Ammonia has been regarded as a promising fuel for PCFCs due to its carbon-free and hydrogen-rich properties, high volumetric energy density and easy storage/transportation. However, the performance of ammonia PCFCs (NH 3 -PCFCs) is far inferior to the hydrogen PCFCs (H 2 -PCFCs) because of the sluggish and complex kinetics at anodes. In this study, we established an elementary reaction kinetic model for NH 3 -PCFCs, investigated the effect of reaction parameters, anode components and reaction partition, and explored the coupling mechanism between the ammonia decomposition and electrochemical reaction. Importantly, the ammonia decomposition and electrochemical reaction can be flexibly regulated by adjusting anode parameters, then affecting the performance ratio of NH 3 -PCFCs and H 2 -PCFCs. The detailed rate-determining steps were further identified by experimental and model analysis. Thus, the ammonia/hydrogen performance ratio of the cell can exceed 95% at 550°C after accelerating the ammonia decomposition reaction. Our work provides insights into the kinetics in NH 3 -PCFCs for improving their performance with optimization.
研究领域:
化学工程
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电化学
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材料科学
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能量转换
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）