Urgent need for waste disposal and renewable energy have opened up promising pathways for renewable and sustainable fuel production to substitute traditional fossil fuels. In this study, catalytic co-pyrolysis of waste paper (WP) and polyvinyl chloride (PVC) as typical municipal solid wastes was experimentally investigated towards hydrogen-rich syngas production . Results indicated the maximum H 2 yield (429 μmol·g cat −1 ·min −1 ) was obtained with 60% PVC weight ratio under 900 °C which was higher than single component pyrolysis . Higher hydrogen yield (681.76 μmol·g cat −1 ·min −1 ) appeared over Fe/CeO 2 –CaO under the optimal conditions compared to that of Ru/ZSM-5-CaO (445.54 μmol·g cat −1 ·min −1 ). From the calculated non-isothermal kinetic parameters , both catalysts could reduce activation energies. Proper porous structure and CaO content in the catalyst could enhance hydrogen production via carbon species fixation.
Recycling Li from spent lithium ion batteries (SLIBs) in an efficient and highly selective manner could protect the environment and introduce the circular economy principle to society. Simultaneously, the urgent need to address plastic waste, particularly polyvinyl chloride (PVC), has become a global concern. In this work, a strategy for Li extraction through synergetic pyrolysis of LiMn 2 O 4 cathode materials (LMO) and PVC is proposed. Under optimal conditions, the recovery rates of lithium and manganese reached 99.89 % and 0.02 %, respectively, demonstrating efficient separation of these elements. Temperature was found to play a critical role in the leaching rates of lithium and manganese by promoting the decomposition and reduction of LMO. Additionally, kinetic analysis shows that the activation energy ( E a ) of the synergetic pyrolysis is 139.60 KJ/mol, and the pyrolysis mechanism satisfies third-order reaction process. Eventually, the proposed mechanism involves the synergistic effects of chlorination and reduction reactions. First, HCl is generated by PVC pyrolysis under the catalytic effect of LMO. Then, the chlorination of HCl with LMO occurs by capturing structural oxygen and generating LiCl and MnCl 2 . Simultaneously, the reduction reaction between the reducing species generated by PVC pyrolysis and LMO occurs to form Li 2 O and MnO, ultimately enabling the separation of lithium and manganese. Overall, this paper presents a novel approach for future applications by providing a theoretical basis for selective Li extraction.
Baoguo Yang,Hongbin Li,Fengcheng Jiang,Mingshi wang,Shengguang Zhang,Kanghui Liu
This study demonstrates a potential pathway for valorizing agricultural and industrial residues by developing a metal-enriched biochar composite (GS/CR-MBC) from corn roots (CR) and gasification slag (GS) via one-step co-pyrolysis. The resulting composite is a mesoporous material. It possesses a specific surface area 22 times greater than that of pristine GS and over 45 times that of CR-derived biochar. The material exhibited a high tetracycline adsorption capacity of 858.7 mg/g and could be regenerated effectively, retaining over 89 % of its initial capacity after five cycles. The adsorption process following the Langmuir isotherm model and pseudo-second-order kinetics. The primary adsorption mechanisms included ligand exchange, coordination complexation, hydrogen bonding, and π–π interactions. These findings highlight the promise of synergistically converting low-value residues into functional materials, supporting the development of a more sustainable and circular bioeconomy.
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