Journal of Analytical and Applied Pyrolysis最新文献_第8页

Utilizing the self-stabilizing stage of ZIF-8 for highly efficient in situ Cl capture during PVC pyrolysis

IF 5.8 2区化学

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-02-10 DOI: 10.1016/j.jaap.2025.107022

Chenhao Li , Yi Niu , Linlin Yi , Yaoqiang Li , Jia Fu , Fang Tang , Kaiyuan Li , Yanyan Zou

{"title":"Utilizing the self-stabilizing stage of ZIF-8 for highly efficient in situ Cl capture during PVC pyrolysis","authors":"Chenhao Li , Yi Niu , Linlin Yi , Yaoqiang Li , Jia Fu , Fang Tang , Kaiyuan Li , Yanyan Zou","doi":"10.1016/j.jaap.2025.107022","DOIUrl":"10.1016/j.jaap.2025.107022","url":null,"abstract":"<div><div>This paper explores the application of zeolitic imidazolate framework-8 (ZIF-8) in pyrolytic disposal of poly(vinyl chloride) (PVC), with the goal of assessing the <em>in situ</em> catalytic removal and capture effect of ZIF-8 on Cl, elucidating the migration pattern of Cl, revealing the mechanism of <em>in situ</em> Cl capture by ZIF-8. The results demonstrate that excellent catalytic and Cl trapping properties are exhibited by ZIF-8, and an additional 311.1 mg/g of organic Cl from PVC is facilitated to be removed at 250 ºC. The catalytic effect enhances Cl trapping at low temperatures. The solid-solid reaction between PVC and ZIF-8 during <em>in situ</em> pyrolysis significantly improves Cl capture compared to <em>ex situ</em> pyrolysis. During <em>in situ</em> pyrolysis, ZIF-8 shows excellent Cl capture between 250 and 350 ºC, where Cl is primarily captured in the solid phase as inorganic Cl. ZIF-8 achieves optimal Cl capture at 300 ºC, reaching a peak HCl removal rate of 89.5 %. At this temperature, the content of solid-phase inorganic Cl reaches a maximum of 442.0 mg/g, accounting for 78.7 wt% of the total Cl content. The key to Cl capture lies in the chemical adsorption sites of Zn²⁺ and organic ligands in the ZIF-8 structure, which can react with Cl in both solid-solid and gas-solid reactions. Additionally, crystals formed during pyrolysis create an adsorption barrier, ultimately enabling efficient Cl capture.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 107022"},"PeriodicalIF":5.8,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pyrolysis kinetics and mechanism of pore formation during the pyrolysis of biomass sawdust impregnated with phosphoric acid

IF 5.8 2区化学

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-02-08 DOI: 10.1016/j.jaap.2025.106999

Honglong Xie, Nian He, Dailiu Hu, Yangyang Luo, Kuantao Zhang, Chongyu Du, Hongyan Pan, Zheng Chen, Qian Lin

{"title":"Pyrolysis kinetics and mechanism of pore formation during the pyrolysis of biomass sawdust impregnated with phosphoric acid","authors":"Honglong Xie, Nian He, Dailiu Hu, Yangyang Luo, Kuantao Zhang, Chongyu Du, Hongyan Pan, Zheng Chen, Qian Lin","doi":"10.1016/j.jaap.2025.106999","DOIUrl":"10.1016/j.jaap.2025.106999","url":null,"abstract":"<div><div>The precise regulation of the pore structure in bio-based activated carbon derived from industrial waste remains a significant challenge, which has impeded the controlled synthesis of high-quality and cost-effective industrial carbon materials. To facilitate the effective resolution of this critical issue, this work studied the pyrolysis kinetics mechanism and pore formation mechanism during pyrolysis of phosphoric acid-impregnated industrial waste biomass sawdust (BP). Results showed that the thermal decomposition of BP proceeded in four stages as follows: stage 1 was the phase boundary chemical reaction mechanism, a power-law diffusion mechanism and a phase boundary chemical reaction mechanism for stage 2, the power-law diffusion mechanism and a three-dimensional diffusion mechanism for stage 3; the stochastic nucleation and growth mechanism for stage 4. The formation mechanisms of pores were: (a) the reactions between H<sub>3</sub>PO<sub>4</sub> and its derived P<sub>2</sub>O<sub>5</sub> with biomas sawdust; (b) the reaction between small molecule gases such as H<sub>2</sub>O, H<sub>2</sub>, and CO<sub>2</sub> with the biomass sawdust. With increase of H<sub>3</sub>PO<sub>4</sub> amount, H<sub>3</sub>PO<sub>4</sub> and P<sub>2</sub>O<sub>5</sub> mainly reacted with biomas sawdust. This process removed large amounts of oxygen and carbon of biomass, meanwhile formed lots of vacancies, accompanying generation of developed mesoporous structure (1.38 cm<sup>3</sup>/g). These findings provide valuable theoretical guidance for the production of high-quality industrial activated carbon with a tunable pore structure.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 106999"},"PeriodicalIF":5.8,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and kinetic modeling study of iso-dodecane: Pyrolysis and oxidation

IF 5.8 2区化学

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-02-07 DOI: 10.1016/j.jaap.2025.106998

Yilun Liang, Mo Yang, Wenjun Wu, Xinzhe Zhang, Juan Wang

{"title":"Experimental and kinetic modeling study of iso-dodecane: Pyrolysis and oxidation","authors":"Yilun Liang, Mo Yang, Wenjun Wu, Xinzhe Zhang, Juan Wang","doi":"10.1016/j.jaap.2025.106998","DOIUrl":"10.1016/j.jaap.2025.106998","url":null,"abstract":"<div><div>2,2,4,6,6-Pentamethylheptane (iso-dodecane) is the primary component of alcohol-to-jet synthetic paraffinic kerosene and also plays a crucial role as an iso-alkane component in jet fuel surrogates. However, there is limited availability of pyrolysis studies on iso-dodecane and its kinetic model requires improvement. In this study, the pyrolysis and oxidation experiments of iso-dodecane were conducted using a flow reactor combined with on-line gas chromatographic (GC) and GC - mass spectrometry (MS) to obtain the mole fraction profiles of species. Based on the obtained experimental data, a new kinetic model for iso-dodecane was developed and validated, demonstrating superior predictive performance compared to the literature models. The rate of production analysis and sensitivity analysis were performed to elucidate the high temperature reaction mechanisms of iso-dodecane. The primary decomposition of iso-dodecane in pyrolysis occurs through unimolecular decomposition channel (U-D) and H-abstraction channel (H-A). The U-D reaction XC<sub>12</sub>H<sub>26</sub> = TC<sub>4</sub>H<sub>9</sub> + IC8–5R governs the fuel's reactivity in pyrolysis. Furthermore, a pyrolysis experiment was conducted for n-dodecane under identical conditions to those employed for iso-dodecane pyrolysis, allowing for a comparison between the two fuels based on the experimental data and modeling analysis. Iso-dodecane exhibits higher pyrolysis reactivity than n-dodecane due to its stronger ability in U-D. The new model was also validated by the ignition delay times from the literature.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"188 ","pages":"Article 106998"},"PeriodicalIF":5.8,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing polystyrene recycling: Temperature-responsive of pyrolysis in a pilot-scale vortex reactor 加强聚苯乙烯的回收利用：中试规模涡流反应器中热解的温度响应性

IF 5.8 2区化学

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-02-07 DOI: 10.1016/j.jaap.2025.107016

Bahman Goshayeshi , Rohit Kumar , Yihan Wang , Robin John Varghese , Sangram Roy , Bhargav Baruah , Angeliki A. Lemonidou , Kevin M. Van Geem

{"title":"Enhancing polystyrene recycling: Temperature-responsive of pyrolysis in a pilot-scale vortex reactor","authors":"Bahman Goshayeshi , Rohit Kumar , Yihan Wang , Robin John Varghese , Sangram Roy , Bhargav Baruah , Angeliki A. Lemonidou , Kevin M. Van Geem","doi":"10.1016/j.jaap.2025.107016","DOIUrl":"10.1016/j.jaap.2025.107016","url":null,"abstract":"<div><div>This study evaluates the pyrolysis of polystyrene in a pilot-scale vortex reactor, focusing on styrene recovery and byproduct distribution at different temperatures. The vortex reactor’s unique design enables enhanced heat and mass transfer, coupled with reduced residence time, leading to minimized secondary reactions. Experiments were conducted at 500 °C, 600 °C, and 700 °C temperatures, with a comprehensive product analysis using GC×GC-FID and RGA. The results show that styrene recovery increases with temperature, reaching 86 wt% and 88 wt% at 600 °C and 700 °C, respectively. This is more than 15 wt% higher than classical continuous reactors such as stirred tanks or fluidized bed reactors. At higher temperatures, the production of undesired oligomers, such as dimers and trimers, decreases. Additionally, the yield of lighter aliphatic compounds increases at higher temperatures, suggesting further cracking of aromatic substituent groups. The findings demonstrate the vortex reactor’s potential in optimizing the pyrolysis process, making it a viable solution for efficient PS recycling.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 107016"},"PeriodicalIF":5.8,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Revealing the regularity of hydrogenation and ring-opening via hydrodenitrogenation on the CaO surface of pyrolysis conditions – Taking pyrrole and pyridine as examples

IF 5.8 2区化学

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-02-07 DOI: 10.1016/j.jaap.2025.107000

Zilong Wang , Shuqi Wang , Lixia Ling , Caiping Ma , Riguang Zhang , Baojun Wang

{"title":"Revealing the regularity of hydrogenation and ring-opening via hydrodenitrogenation on the CaO surface of pyrolysis conditions – Taking pyrrole and pyridine as examples","authors":"Zilong Wang , Shuqi Wang , Lixia Ling , Caiping Ma , Riguang Zhang , Baojun Wang","doi":"10.1016/j.jaap.2025.107000","DOIUrl":"10.1016/j.jaap.2025.107000","url":null,"abstract":"<div><div>Removing nitrogen-containing substances during low-rank coal and sludge co-pyrolysis is crucial for the resource utilization and environmental protection. We have intensively investigated the intramolecular hydrogen transfer denitrification and hydrodenitrogenation (HDN) reaction pathways of pyrrole and pyridine on the CaO(001) surface using density functional theory (DFT) method. Compared to hydrogen transfer, hydrogenation significantly promotes nitrogen removal. We obtained the mechanism of partial hydrogenation pathways in which the unsaturated β-C position radical is formed to break C−N bond via Hofmann elimination (E2) mechanism. On this basis, we found the universality of nitrogen-containing heterocycle compounds HDN on CaO surface: the delocalized conjugated radical intermediates are more stable than the localized radical intermediates, which is the decisive factor for the cleavage of the C−N bond and the C−C bond; the strong nucleophilicity and weak steric hindrance mean the high hydrogenation activity, which influences the hydrogenation sequence; the acidity or alkalinity of the nitrogen-containing compounds determines their adsorption modes on the CaO surface, which is a factor affecting the distribution of the products. The microkinetic analysis result shows that the HDN reaction rates of pyrrole and pyridine significantly increase when the temperature reaches to 950 K and the main denitrification product is NH<sub>3</sub>. Our research provides new insights into more nitrogen-containing heterocycle compounds HDN.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 107000"},"PeriodicalIF":5.8,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microwave catalytic co-pyrolysis of sugarcane bagasse and Chlorella vulgaris over composite catalyst: Characteristics and bio-oil analysis

IF 5.8 2区化学

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-02-06 DOI: 10.1016/j.jaap.2025.107008

Xingchen Zhao , Song Qiu , Mingshan Jiang , Chunxiang Chen , Shiyuan He

{"title":"Microwave catalytic co-pyrolysis of sugarcane bagasse and Chlorella vulgaris over composite catalyst: Characteristics and bio-oil analysis","authors":"Xingchen Zhao , Song Qiu , Mingshan Jiang , Chunxiang Chen , Shiyuan He","doi":"10.1016/j.jaap.2025.107008","DOIUrl":"10.1016/j.jaap.2025.107008","url":null,"abstract":"<div><div>Microwave co-pyrolysis of <em>Chlorella vulgaris</em> (CV) and bagasse (BA) with composite additives (the mixing of two or more single catalysts) can effectively improve the pyrolysis characteristics and the quality of bio-oil. In this study, a composite catalyst B1O1 was prepared by bio-char (BC) and calcium oxide (CaO) at the ratio of 1:1. The comparison between the effects of B1O1 and two single catalysts (BC and CaO), at different addition amounts (10 %, 20 %, 30 %, 40 % and 50 %) was investigated. Also, the effect of the interaction between BC and CaO during co-pyrolysis was analyzed. The results showed that the B1O1 composite catalyst can effectively improve the co-pyrolysis characteristics, and the maximum weight loss rate (<em>R</em><sub>m</sub>, 0.11106 wt%/s) and the maximum average weight loss rate (<em>R</em><sub>v</sub>, 0.02674 wt%/s) were obtained at 50 % B1O1. Moreover, at 40 % B1O1, the bio-oil yield reached the highest (23.50 %). Finally, GC-MS analysis showed that, under 40 % B1O1, the content of nitrogen and oxygen containing compounds in bio-oil was reduced by 1.85 % and 8.99 %, respectively, while the hydrocarbons content was increased by 14.17 %.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 107008"},"PeriodicalIF":5.8,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143334434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modification of highly acid ZSM-5 composed of nanocrystal stacks for reforming of lignite pyrolysis volatiles to light aromatics 改性由纳米晶体堆组成的高酸性 ZSM-5，用于将褐煤热解挥发物转化为轻芳烃

IF 5.8 2区化学

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-02-06 DOI: 10.1016/j.jaap.2025.107009

Shi-Jie Cai , Jing-Pei Cao , Nai-Yu Yao , Jing-Ping Zhao , Xin-Bo Pang , Min Xu , You Lu , Xiao-Yan Zhao , Tungalagtamir Bold

{"title":"Modification of highly acid ZSM-5 composed of nanocrystal stacks for reforming of lignite pyrolysis volatiles to light aromatics","authors":"Shi-Jie Cai , Jing-Pei Cao , Nai-Yu Yao , Jing-Ping Zhao , Xin-Bo Pang , Min Xu , You Lu , Xiao-Yan Zhao , Tungalagtamir Bold","doi":"10.1016/j.jaap.2025.107009","DOIUrl":"10.1016/j.jaap.2025.107009","url":null,"abstract":"<div><div>The catalytic conversion of pyrolytic volatile matter from lignite represents an effective strategy for the high-value utilization of low-rank coal. Highly acidic (Si/Al = 11) ZSM-5 zeolites consisting of nanocrystalline stacks were synthesized in a controlled manner and treated with ZSM-5 using an ethanol-triethylamine-water buffer solution system, and the acidity and structure of the zeolites were modulated by varying the treatment time. The series catalysts were employed in the conversion of lignite pyrolysis volatiles to light aromatics (LAs). The pore size of the highly acidic ZSM-5 zeolite was increased by the treatment of the slow-release solution, the strong acid content was reduced and the medium and weak acid content was increased. This one-step modification combines the processes of pore size enlargement and acid center optimization, thus reducing the rate of catalyst deactivation and increasing light aromatic yields. HZ-168 (treated with an alkaline solution for 168 h) gave LAs yielded up to 27.1 mg/g, characterized by the highest amount of B/L acid, the largest pore volume and mesoporous surface area. Furthermore, the activity remained stable after five cycles, indicating the potential for sustained performance. The increase in the number of nanocrystalline interstitial pores and the enlargement of the average pore size promoted the mass transfer efficiency of the reactants as well as the accessibility of the catalyst acid sites with the treatment time.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 107009"},"PeriodicalIF":5.8,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microwave co-pyrolysis characteristics and product component of Chlorella vulgaris and polypropylene under solid acid catalyst/graphite composite additives

IF 5.8 2区化学

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-02-06 DOI: 10.1016/j.jaap.2025.107002

Jian Zhao , Ronglin Yang , Shiyuan He , Chunxiang Chen , Zhiwei Luo , Shouqiang Wan , Hongjian Ling

{"title":"Microwave co-pyrolysis characteristics and product component of Chlorella vulgaris and polypropylene under solid acid catalyst/graphite composite additives","authors":"Jian Zhao , Ronglin Yang , Shiyuan He , Chunxiang Chen , Zhiwei Luo , Shouqiang Wan , Hongjian Ling","doi":"10.1016/j.jaap.2025.107002","DOIUrl":"10.1016/j.jaap.2025.107002","url":null,"abstract":"<div><div>Appropriate additives can enhance the quality of bio-oil produced through microwave co-pyrolysis. In this paper, solid acid catalyst/graphite (SA/GP) composite additives at different ratios (SA:GP = 10:0, 7:3, 5:5 and 3:7, denoted as SA, S7G3, S5G5 and S3G7, respectively) were prepared. The effects of SA/GP addition (10 %, 20 %, 30 % and 40 %) on co-pyrolysis characteristics, product yield and bio-oil components of <em>Chlorella vulgaris</em> (CV) and polypropylene (PP) were studied by microwave pyrolysis furnace and GC-MS. Results showed only 40 % addition promoted the pre-middle stage of co-pyrolysis when adding SA. The maximum average weight loss rate <em>R</em><sub>v</sub> (0.839 wt%/min) and the minimum total pyrolysis reaction time <em>t</em><sub>s</sub> (88.250 min) were observed at 30 % S3G7. Compared with no additives, the maximum bio-oil yield (29.37 wt%) was obtained at 30 % S5G5 and the maximum hydrocarbon content (42.16 %) was obtained at 30 % S3G7. The porous structure of SA promoted the dehydration and aromatization of small molecules, resulting in a maximum aromatic yield of 11.77 % at 30 % S7G3. Overall, the SA/GP composite additives showed good stability and deoxidizing ability in microwave co-pyrolysis and can be used to improve the yield and quality of bio-oil.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 107002"},"PeriodicalIF":5.8,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biochar produced from bio-refined herbaceous fibre residue for feed and technical purposes

IF 5.8 2区化学

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-02-05 DOI: 10.1016/j.jaap.2025.107004

Andrej Šáner , Morten Ambye-Jensen , Søren Krogh Jensen , Katrin Vorkamp , Marcel Ceccato , Aidan Mark Smith

{"title":"Biochar produced from bio-refined herbaceous fibre residue for feed and technical purposes","authors":"Andrej Šáner , Morten Ambye-Jensen , Søren Krogh Jensen , Katrin Vorkamp , Marcel Ceccato , Aidan Mark Smith","doi":"10.1016/j.jaap.2025.107004","DOIUrl":"10.1016/j.jaap.2025.107004","url":null,"abstract":"<div><div>Recent research and development in green biorefining aim to produce a sustainable protein feed from domestically grown grasses and legumes, that can substitute imported soymeal in animal feeds. A byproduct of this process is a high fibre press-cake fraction, that will require valorisation. Integration of pyrolysis of the press-cake into the herbaceous protein production is an innovative approach to increase the economic and environmental viability of the biorefinery. This work investigated the production of biochar for animal feed from the fibre press-cake via slow pyrolysis in a laboratory-scale batch reactor. Different herbaceous species were investigated (i.e. grass-clover and lucerne) as well as a range of pyrolysis conditions (i.e. temperature 400, 600 and 800 °C with residence time 20 and 60 minutes). The results showed that the level of severity of fibre processing within the green biorefinery affects the resulting biochar more than the type of the original biomass. The pyrolysis temperature had a greater effect on the resulting biochar than the residence time, with biochar yields continuously decreasing from 32 wt% at 400 °C to 22 wt% at 800 °C. Generally, all herbaceous biochars had rather uniform characteristics, as shown by elemental composition, FTIR and XPS. The levels of investigated organic contaminants (i.e. polychlorinated biphenyls and polycyclic aromatic hydrocarbons) were in all samples below the legal limits. All biochars had low adsorption capacity towards the methylene blue (less than 12 mg/g). However high carbon content (above 60 wt%) and Scanning Electron Microscope images suggested a good potential for carbon activation.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 107004"},"PeriodicalIF":5.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving biochar's phosphate adsorption using active metal substances in Byer red mud

IF 5.8 2区化学

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-02-05 DOI: 10.1016/j.jaap.2025.107006

Renhui Ruan , Weijian Hua , Wenjun Yang , Shiyao Jia , Jiahui Ma , Xue Zhao , Jinduo Wang , Xuebin Wang , Houzhang Tan

{"title":"Improving biochar's phosphate adsorption using active metal substances in Byer red mud","authors":"Renhui Ruan , Weijian Hua , Wenjun Yang , Shiyao Jia , Jiahui Ma , Xue Zhao , Jinduo Wang , Xuebin Wang , Houzhang Tan","doi":"10.1016/j.jaap.2025.107006","DOIUrl":"10.1016/j.jaap.2025.107006","url":null,"abstract":"<div><div>Modifying biochar with solid wastes enhances phosphate adsorption capacity and facilitates solid waste utilization. However, there is limited research on utilizing bulk solid wastes to improve the phosphates adsorption performance of biochar. In this study, a bulk industrial solid waste, Bayer red mud, was used as a modifier to improve the phosphate adsorption capacity of biochar. Several factors including mixing method and blending ratio of biomass and red mud, acid concentration, and pyrolysis temperature were investigated to determine their influence on the phosphate adsorption capacity of red mud modified biochar (RMB). The adsorption mechanisms were examined by analyzing adsorption kinetics, isotherms, thermodynamics, approximate site energy distribution, and biochar's physical and chemical properties. The results showed that acid impregnation with optimal blending ratio and pyrolysis temperature significantly increased the phosphate adsorption capacity of RMB up to 137.69 mg/g. The adsorption of phosphates by RMB followed the Pseudo 2nd order and Langmuir isotherm models, suggesting monolayer chemisorption on a homogeneous surface, as supported by the analysis of approximate site energy distribution. The characterizations of RMB suggested that the dominant mechanism for phosphate adsorption by RMB was precipitation, rather than ligand exchange or electrostatic attraction. Acid impregnation improves the extraction of Fe, Al, and Ca from Byer red mud, enhancing the dispersion of their oxides in biochar. Moreover, the P-rich RMB improved the growth of grass seedlings, suggesting its potential as a P fertilizer.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 107006"},"PeriodicalIF":5.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0