ChemistrySelect
·
2024
·Vol. 9
·期 28
·e202401039
·
IF 1.9
Xueqi Wang,Kai Li,Fei Wang,Lei Shi,Shuangyou Bao,Jiacheng Bao,Xin Sun
Graphical In this study, we prepared the thermally modified copper slag catalyst CS-CaO-900 and applied it to a pilot-scale Fenton-like denitrification system. In single-factor experiments, the effects of six factors, namely inlet NO concentration, H 2 O 2 concentration, catalyst dosage, reaction temperature, L/G ratio, and pH value, on desulfurization and denitrification were investigated. Through analysis of the experimental results, the three factors that had the greatest impact on the maximum denitrification efficiency, namely pH value, H 2 O 2 concentration, and reaction temperature, were selected. The response surface methodology was employed to investigate the significance of the three factors and optimize the parameters, and it was finally determined that the initial pH of the slurry had the greatest impact on the maximum denitrification efficiency, followed by the H 2 O 2 concentration. At the same time, the combination of initial slurry pH and reaction temperature, initial slurry pH and H 2 O 2 concentration also had a large impact on the maximum denitrification efficiency, and the combination of reaction temperature and H 2 O 2 concentration had a non-significant impact on the denitrification efficiency. And through the model optimization to get the best parameters, denitrification experiments under this parameter to achieve the maximum denitrification efficiency of 91.5 %, for further industrial application to provide reference and guidance. In this study, Response Surface Methodology (RSM) was employed to optimize the experimental factors influencing the simultaneous removal of NOx and SO 2 in a spray tower wet scrubbing experiment. Thermally modified copper slag (CS-CaO-900) was prepared by heat treating the original copper slag. The performance of CS-CaO-900 in the synchronized removal of NOx and SO 2 was then evaluated in an expanded experimental setup. Based on single-factor experimental results, the Box-Behnken design of RSM was used to optimize the reaction parameters in a two-stage sequential reactor (bubbling reactor + spray tower). NOx removal efficiency was modeled as a function of reaction temperature, pH, and H 2 O 2 concentration. Regression curves provided a visual representation of the interaction effects among these parameters on NOx removal efficiency in the thermally modified copper slag/H 2 O 2 composite slurry. This study elucidates the characteristics of each parameter under wet scrubbing conditions and provides essential data for industrial applications.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
FUEL
·
2022
·
IF 8.035
K. Radhakrishnan,P. Senthil Kumar,Gayathri Rangasamy,L. Praveen Perumal,S. Sanaulla,S. Nilavendhan,V. Manivasagan,K. Saranya
Plastic production has increased globally, and many of these plastic items are no longer in use. The plastic wastes end up as garbage, disposed of in landfills, or scattered, posing major health and environmental risks. In terms of sustainability, converting plastic trash into fuels or any other better option, individual monomers, is a far more environmentally friendly waste management option than landfill dumping. Nearly 1.3 billion metric tonnes of plastic are produced annually as businesses strive to meet the demands of consumers. Plastic is made through a process called polymerization, in which hydrocarbons are rearranged into new molecules. These hydrocarbons often have a high molecular mass, and they may also contain other chemicals to boost their performance. Plastic is a useful material because, among other things, it is durable, lasts a long time, is inexpensive, and has many other benefits. Because plastic can take decades to degrade if left alone, effective waste plastic disposal should be a top priority for every-one. Yet, growing industrialization and urbanization have contributed to a discernible rise in fuel demand. Finding renewable energy sources to replace fossil fuels is now a critical global priority. Plastics-to-gasoline conversion provides a means to solve both of these problems. By applying intense heat (more than 370 °C) and an oxygen-free environment, pyrolysis thermochemically decomposes organic materials. The byproducts of pyrolysis are carbon black, hydrocarbons, and pyrolysis oil. This review focuses on pyrolysis as it is the most popular and efficient method for turning polymers into fuels in comparison with other methods. This review comprises the knowledge of different types of plastics and their properties. The major discussion was focused on pyrolysis methods for recycling plastics. To have better knowledge competitive recycling method were discussed. The optimization parameter for recycling process, by-products of plastics, advantages and disadvantages of pyrolysis process are discussed to identify the drawbacks and research gaps. The pyrolysis method are potential for addressing waste plastic management and highlights the need for a reliable alternative fuel source.
研究领域:
环境科学
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能源工程
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DOI
高影响因子
Processes
·
2021
·Vol. 9
·期 11
·1923
·
IF 2.847
Bo Wang,Qiaowen Yang
Every year, large amounts of selective catalytic reduction (SCR) catalysts with losing catalytic activity and failing to be regenerated need to be regenerated, which will result in acute pollution. Recycling valuable metals from spent SCR catalysts can not only solve environmental problems, but also save resources. The process of sodium roasting and water leaching is able to effectively extract vanadium (V) and tungsten (W) from spent SCR catalysts. To improve the efficiencies of V and W, different sodium additives were first investigated in the roasting process. The results revealed that the process of NaCl-NaOH composite roasting and water leaching showed superior leaching efficiencies of V and W, which can reach 91.39% and 98.26%, respectively, and simultaneously, it can be found that adding low melting point NaOH promoted mass transfer as compared with the melting points of different sodium additives. Next, a single-factor experiment was conducted to investigate different roasting conditions, such as roasting temperature, roasting time, mass ratio of sodium additive and catalyst, and mass ratio of NaCl and NaOH, on the leaching efficiencies of V and W. Then, a three-level and four-factor orthogonal experiment and a weight matrix analysis were used to optimize the roasting parameters. The results showed that roasting temperature had the most significant effect on the leaching efficiencies of V and W, and the optimal roasting conditions were as follows: the roasting temperature was 750 °C, the roasting time was 2.5 h, the mass ratio of sodium additive and catalyst was 2.5, and the mass ratio of NaCl and NaOH was 1.5. Under the optimal roasting conditions, the leaching efficiencies of V and W were 93.25% and 99.17%, respectively. The results of XRD analysis inferred that VO2coming from the decomposition of VOSO4in spent SCR catalysts may first oxidize into V2O5and then react with sodium additives to produce NaVO3. The formation of titanium-vanadium oxide ((Ti0.5V0.5)2O3) was a part reason of hindering the leaching of vanadium. With the increase of roasting temperature, TiO2converted into Na2Ti3O7, which indicated that the main structure of the catalyst was destroyed, and simultaneously, more characteristic peaks of sodium metavanadate and sodium tungstate appeared, thus enhancing the leaching of V and W. Finally, it can be seen that the process of NaCl-NaOH roasting and water leaching remained higher leaching efficiencies of V and W and lower roasting temperature by comparing with leaching efficiencies of V and W in different processes of recycling SCR catalyst. The process of NaCl-NaOH composite roasting and water leaching provided a strategy with a highly efficient and clean route to leach V and W from spent SCR catalyst. The orthogonal experiment and weight matrix analysis in our study can be used as a reference to optimize the reaction conditions of a multiple indexes experiment.
研究领域:
环境科学
·
冶金工程
✓ 已验证
DOI
高影响因子
APPLIED SOIL ECOLOGY
·
2025
·
IF 5
Luan Zhou,Tongxin Wang,Weijie Song,Wanting Ling,Xuwen Chen
An effective Fenton oxidation technology was developed to degrade PAHs in the soil, and fluorene (FLU), phenanthrene (PHE), fluoranthene (FLA) and pyrene (PYR) were selected as primary pollutants. This research presented a systematic approach to optimize the key operational parameters, such as reaction time, H 2 O 2 concentration, Fe 2+ /H 2 O 2 addition ratio, pH value, and soil-water ratio, those factors altogether affected the generation of • OH and the overall degradation efficiency of PAHs. The optimized parameter combination of Fenton technology suitable for PAHs degradation in complex soil environments was proposed. The key parameters were as follows: soil-water ratio was 2:1, pH was 3, H 2 O 2 concentration was 11 % of the total system, Fe 2+ /H 2 O 2 addition ratio was 1/8, and reaction time was 24 h. The degradation percentages for FLU, PHE, FLA and PYR were 75.4 %, 66.2 %, 60.8 % and 93.7 % in this optimized system, respectively. As the reaction time increased, the degradation efficiency of PAHs by Fenton technology reached the maximum until it became stable or slightly decreased. Appropriate H 2 O 2 concentration and Fe 2+ /H 2 O 2 addition ratio were conducive to the maximum generation of • OH, thus improving the degradation efficiency of PAHs. The pH value significantly influenced the degradation of PAHs, and the soil-water ratio had important effects on the Fenton oxidation process. By optimizing these conditions, a more thorough and profound assessment of the Fenton technology's applicability in treating actual-world PAHs-polluted soils was achievable, and it was expected to reduce the restoration cost. Meanwhile, it also contributed to the development of more efficient and sustainable soil remediation strategies.
研究领域:
环境科学
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污染治理
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DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.8
Tian-qiong Peng,Yanfei Wang
In this study, amino modified mesoporous silica (HMS-TEEPA-TEA) was used for the first time to remove uranium (VI) from aqueous solution. The synthesized HMS-TEEPA-TEA was characterized by SEM, EDS, FTIR, BET and XPS techniques. The present work attempted to optimize and compare the adsorption process parameters like pH, adsorbate concentration, and adsorbent dose using Box-Behnken designs of response surface methodology. The adsorption amount and removal rate reached 337.26 mg/g and 99.57%, respectively. Model P> F < 0.0001 in this experiment (generally P > F < 0.05 is considered significant), indicating that the model is extremely significant and can be considered as highly referable for its predicted response values. The fit of the data to the Langmuir isotherm and the proposed secondary kinetics indicates that the adsorption process is monolayer and chemical in nature. The effect of copper on HMS-TEEPA-TEA adsorption is more complex than other background ions. The removal of uranium (VI) by HMS-TEEPA-TEA remained above 80% for four consecutive experiments with repeated adsorbent use. The results indicate that HMS-TEEPA-TEA is an effective adsorbent for the removal of uranium (VI) from aqueous solutions with the advantages of low cost, high availability and easy production.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2023
·Vol. 107
·期 3
·548-559
·
IF 2.5
Pan Zixin,Liang Xiaoping,Yan Su,Zeng Jing,Bai Jinshuo,Zhang Dequan,Yang Guixiang,Liu Zhifeng
Electrochromic glass, one of the green energy-saving building materials, get more and more attention. The advancement of efficient ion storage film become a hot topic of research. The porous V 2 O 5 ion-storage film was prepared by sol-gel method using polyethylene glycol (PEG) as the pore-former. The peak current of porous V 2 O 5 films heated at 300 °C increased substantially due to the volatility temperature of PEG at 285 °C. The mutual effects of the PEG content, heat treatment temperature, and heat treatment time on the structure and electrochromic properties of porous V 2 O 5 film were investigated by the response surface method (RSM). The results show that the influence extent on ion storage is: heat treatment temperature > PEG content > heat treatment time. Under optimized process parameters of PEG content 6.2 g/100 mL sol, heat treatment time 4 h, heat treatment temperature 310 °C, the porous V 2 O 5 film exhibited excellent ion storage capacity (87.28 mC·cm −2 ). The electrochromic device (ECD) with optimized porous V 2 O 5 ion-storage film as the counter electrode of electrochromic WO 3 film has been successfully assembled, which shows fascinating performance with high optical contrast (87.8% at 550 nm) and fast response time (bleaching/coloring: 4.5/3.7 s). Graphical Abstract
研究领域:
材料科学
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能源技术
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DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2024
·
IF 1.6
Ming Hao,Tianyi Zhang,Xiaodong Hu,Zhijun Chen,Bo Yang,Yanbo Liu,Xiaoxiao Wang,Yong Liu
Conjugated electrospinning is an exciting way to prepare nanoyarns. However, all currently reported preparations of nanofiber yarns by conjugated electrospinning use needles, which can cause discontinuous yarn production due to plugging needles during the preparation process. Herein, a novel disc treated with rounded corners as the spinneret of conjugated electrospinning was developed to spin continuously twisted nanofiber yarn to overcome the existing problems. First, finite element analysis was used to optimize the parameters of the disc. The disc exhibited the optimal field strength distribution on the spinning surface when the disc rounding angle was 0.7, and the coefficient of variation value of the field strength was only 12.6%. After that, we optimized the effect of spinning parameters on yarn yield by central composite design. In addition, the impact of spinning parameters on fiber morphology was also investigated. Under the optimized parameters, it is possible to spin continuously at a 360 m/h speed for at least 1 h without breaking. This innovative approach provides a novel idea for continuously producing nanofiber yarns.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
Reaction Chemistry & Engineering
·
2023
·Vol. 8
·期 8
·1993-2000
·
IF 3.9
Shichun Weng,Wei Feng,Wenqian Wu,Zichao Guo,Junjie Li,Huanhuan Chen,Liping Chen,Wanghua Chen
3-Amino-4-amidoximinofurazan (AAOF) is an important precursor for the synthesis of high energy furazan energetic materials. The traditional batchwise synthesis approach has the shortcomings of low productivity and high possibility of thermal runaway. This article aims to develop a continuous-flow and safe synthesis approach for AAOF. To achieve this goal, the precipitation problems appearing in the oximation and cyclization reaction stages have been first tackled by diluting the hydroxylamine hydrochloride and sodium hydroxide solution with water, which also reduced the thermal risk of AAOF synthesis. The continuous-flow platform for AAOF synthesis has been established, and the continuous-flow operation parameters have been optimized. The optimal temperatures for the nitrosation–rearrangement coupling reaction, neutralization reaction, oximation and cyclization were 15 °C, 15 °C, 25 °C and 115 °C, respectively. The optimal set retention times for these four stages were 15 min, 5 min, 60 min and 10 min, respectively. The continuous-flow synthesis approach offered an optimal yield of AAOF (95%), which is comparable to the result of batch operation. The total flow rate of the whole process is 10.34 mL min−1, and the final productivity is calculated to be about 0.546 mol h−1 of AAOF. The main merits for the continuous-flow synthesis of AAOF include the following: (1) the reaction time is only one-third of that for batch operation and (2) continuous-flow operation is inherently safe due to the lower liquid holdup and stronger temperature control ability. This work is supposed to be beneficial to the continuous and safe synthesis of AAOF.
研究领域:
化学工程
·
能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
Micro & Nano Letters
·
2024
·Vol. 19
·期 3
·e12200
·
IF 1.5
Rongguang Zhang,Xun Chen,Han Wang,Jun Zeng,Xuanzhi Zhang,Xiaojie Chen
Multi-needle electrospinning is a simple and general method for mass preparation of nanofiber membrane, which has great industrial potential. However, the bending instability produced in the electrospinning process makes that the deposition uniformity of the nanofiber is still a big concern, resulting in non-uniform nanofiber membrane, which seriously affects the application of electrospun membrane in environmental filtration, new energy and medical fields. In order to improve the uniformity of nanofiber deposition in multi-needle electrospinning, an auxiliary flow field system (AFF) is proposed, which can effectively improve the uniformity of nanofiber deposition. After image processing, the uniformity of nanofiber deposition is quantified with the index of grey distribution, and the effectiveness of this method is verified. Combined with the multi-physical field analysis, the influence mechanism of cross-wind field on the uniformity of fibre deposition was revealed. By optimizing the experimental parameters, the non-uniformity of nanofiber deposition was reduced by 49.19%. Based on multi-needle electrospinning technology, a reliable idea (AFF) and experimental basis are provided for the uniform preparation of nanofiber membrane.
研究领域:
材料科学
·
环境工程
·
医学工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2019
·
IF 7.181
Yujiao Zhang,Shengli Niu,Chunmei Lu,Zhiqiang Gong,Xun Hu
This research focused on the novel, low-cost and green NaAlO 2 /γ-Al 2 O 3 heterogeneous nanocatalyst, which exhibited the excellent performance in catalyzing transesterification of palm oil with methanol for the biodiesel production. The physicochemical properties of the catalysts were characterized by different methods of the X-ray diffraction (XRD), N 2 adsorption–desorption, attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), Hammett indicators, field emission scanning electron microscopy-energy dispersive spectrometer (FESEM-EDS) and inductively coupled plasma-optical emission spectrometry (ICP-OES). The transesterification parameters, such as the methanol to oil molar ratio, catalyst content and reaction temperature, were optimized using the central composite design (CCD) based the response surface methodology (RSM), where the maximum biodiesel yield of 97.65% was achieved at the methanol to oil molar ratio of 20.79:1, catalyst content of 10.89 wt% and reaction temperature of 64.72 °C. The biodiesel yield was dropped to 52.16% for the third reused cycle due to the leaching of the active sites into the liquid phase. However, the spent catalyst could be effectively regenerated with a small number of active sites and the regenerated catalyst maintained the biodiesel yield of 93.29% for the sixth reused cycle. The properties of the produced biodiesel were in accordance with the ASTM D 6751 standard. Also, the biodiesel production process was environmental friendly based on the green chemistry metrics.
研究领域:
化学工程
·
可再生能源
·
催化科学
✓ 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）