Evaluating the combined influence of microwave-enhanced alkali pretreatment and copyrolysis on characteristics of biochars produced by thermal and microwave pyrolysis

IF 3.1 3区工程技术 Q2 CHEMISTRY, ANALYTICAL Journal of Thermal Analysis and Calorimetry Pub Date : 2024-10-03 DOI:10.1007/s10973-024-13587-6

Remya Neelancherry, Prakash Binnal, N. Keerthi Kumar, Ranjeet Kumar Misra, N. R. Banapurmath, Ashok M. Sajjan, Irfan Anjum Badruddin, Sarfaraz Kamangar, Mohammed Alqahtani

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Abstract

In the present study, a two-step process involving microwave-enhanced alkali pretreatment (MEAP) of rice husk followed by the copyrolysis of pretreated rice husk with LDPE was adopted to produce biochars in conventional electrically heated pyrolyzer (CPR) and microwave pyrolyzer (MWPR). Proximate and ultimate analysis revealed that biochar produced in MWPR exhibited higher fixed carbon (73.36%), lower volatile matter (8.45%), lower ash yield (17.41%), higher-carbon content (73.57%) and lower H/C and O/C ratios (0.19 and 0.12, respectively), as compared to biochar produced in CPR. BET analysis indicated that the surface area and total pore volume were significantly higher for biochar produced under microwave irradiation (1280.31 m² g⁻¹ and 0.41 cc g⁻¹), as compared to biochar produced in CPR (470.25 m² g⁻¹ and 0.12 cc g⁻¹). The XRD analysis showed that the biochar produced in MWPR exhibited two peaks at 26° (JCPDS No. 41-1487) and 43° (JCPDS Card No. 75-1621), thus closely resembling the reduced graphene oxide. Furthermore, uniform and cleaner pores were observed for MWPR chars in contrast with heterogeneous surface and blocked pores for CPR chars.

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评估微波强化碱预处理和复制分解对热解和微波热解产生的生物沼渣特性的综合影响

本研究采用微波增强碱预处理（MEAP）稻壳，然后将预处理后的稻壳与低密度聚乙烯进行复制分解的两步法，在传统电加热热解器（CPR）和微波热解器（MWPR）中生产生物炭。近似和终极分析表明，与 CPR 中生产的生物炭相比，MWPR 中生产的生物炭具有较高的固定碳（73.36%）、较低的挥发性物质（8.45%）、较低的灰分（17.41%）、较高的碳含量（73.57%）以及较低的 H/C 和 O/C 比率（分别为 0.19 和 0.12）。BET 分析表明，与 CPR 生产的生物炭（470.25 m2g-1 和 0.12 cc g-1）相比，微波辐照下生产的生物炭的表面积和总孔隙率明显更高（1280.31 m2 g-1 和 0.41 cc g-1）。XRD 分析表明，用 MWPR 生产的生物炭在 26°（JCPDS 编号：41-1487）和 43°（JCPDS 证号：75-1621）处出现两个峰，因此与还原氧化石墨烯非常相似。此外，还观察到 MWPR 炭具有均匀且更清洁的孔隙，而 CPR 炭则具有异质表面和堵塞的孔隙。

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来源期刊

Journal of Thermal Analysis and Calorimetry 化学-分析化学

CiteScore

8.50

自引率

9.10%

发文量

577

审稿时长

3.8 months

期刊介绍： Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.