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Recycling
Special Issues
Rubber Waste and Tyre Stewardship
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Rubber Waste and Tyre Stewardship

A special issue of Recycling (ISSN 2313-4321).

Deadline for manuscript submissions: closed (31 October 2025) | Viewed by 2298

Special Issue Editor

Dr. Shifeng Wang

E-Mail Website
Guest Editor
School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: rubber; asphalt; decrosslinking; tyre recycling; aging; sustainability; devulcanization; road

Special Issue Information

Dear Colleagues,

The number of end-of-life tyres (ELTs) has exceeded 1 billion/y globally, and their random accumulation and improper disposal have caused serious environmental pollution problems and resource wastage. The efficient upcycling of ELTs is of great significance to sustainable development. This Special Issue focuses on green chemistry and high-value-added situations, particularly real practical cases, which are key to the upcycling of ELTs. This issue welcome papers from different areas related to rubber upcycling to fill the gap in research and accelerate the industry.

Dr. Shifeng Wang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Recycling is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • tyre rubber
  • asphalt
  • decrosslinking
  • upcycling
  • ageing
  • devulcanization
  • road

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Published Papers (2 papers)

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Research

16 pages, 1672 KB  
Article
Impact of Particle Size on Properties of 100% Recycled End-of-Life Tire Rubber Sheets from Calendering
by Anna Gobetti, Giovanna Cornacchia, Kamol Dey and Giorgio Ramorino
Recycling 2025, 10(6), 207; https://doi.org/10.3390/recycling10060207 - 13 Nov 2025
Viewed by 331
Abstract
This study investigates additive-free cold calendering of ELT-derived rubber powders across three particle size fractions (<0.5 mm, 0.5–0.71 mm, and 0.71–0.90 mm) using a two-roll mill without external heating or virgin polymers, aiming to obtain a cohesive material. Results demonstrate particle size effects [...] Read more.
This study investigates additive-free cold calendering of ELT-derived rubber powders across three particle size fractions (<0.5 mm, 0.5–0.71 mm, and 0.71–0.90 mm) using a two-roll mill without external heating or virgin polymers, aiming to obtain a cohesive material. Results demonstrate particle size effects on material properties. The finest fraction exhibited the highest crosslink density (5.30 × 10−4 mol·cm−3), approximately 18% greater than coarser fractions, correlating with superior hardness (≈65 ShA) and elastic modulus (≈7.5 MPa). Tensile properties ranged from 1.6–1.8 MPa stress and 60–75% elongation at break, positioning calendered sheets between low-temperature compression-molded GTR and high-pressure sintered materials reported in the literature. The cold calendering process achieves competitive mechanical performance with reduced energy consumption, simplified processing, and complete retention of recycled content. These findings support the development of regulation-compliant ELT recycling technologies, with potential applications in nonstructural construction panels, vibration-damping components, and protective barriers, advancing circular economy objectives while addressing emerging microplastic concerns. Full article
(This article belongs to the Special Issue Rubber Waste and Tyre Stewardship)
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18 pages, 4718 KB  
Article
Recovering Zinc and Iron from Waste Tire-Derived Pyrolysis Carbon Black to Prepare Layered Metal Hydroxide Composites for Efficient Adsorption of Dye Methyl Orange
by Pei Chen, Wenli Liu, Yanzhi Sun, Yongmei Chen and Junqing Pan
Recycling 2025, 10(2), 76; https://doi.org/10.3390/recycling10020076 - 15 Apr 2025
Cited by 2 | Viewed by 1468
Abstract
The pyrolysis carbon black (CBp) from waste tires contains zinc, iron, and other metal elements, which have high recycling value. This study proposes a simple method of recovering zinc and iron from waste tire-derived CBp to synthesize hydrotalcite-type adsorbents for the treatment of [...] Read more.
The pyrolysis carbon black (CBp) from waste tires contains zinc, iron, and other metal elements, which have high recycling value. This study proposes a simple method of recovering zinc and iron from waste tire-derived CBp to synthesize hydrotalcite-type adsorbents for the treatment of anodic dye wastewater. Firstly, zinc-aluminum hydrotalcite (LDH) and zinc-iron aluminum hydrotalcite (FeLDH) were obtained by leaching the zinc and iron ions from CBp with an acid solution. As compared with LDH, FeLDH shows increased laminate metal ion arrangement density and layer spacing. By calcining the LDH and FeLDH at 500 °C, zinc aluminum oxides (LDO) and zinc iron aluminum oxides (FeLDO) were then prepared and applied for the adsorption of dye methyl orange (MO). The results demonstrate that the maximum adsorption capacity of LDO and FeLDO are 304.9 and 609.8 mg g−1 at pH of 4.0, respectively. The adsorption processes of both LDO and FeLDO are consistent with the Langmuir adsorption isotherm and the proposed second-order kinetic model. The adsorption regeneration performance and adsorption mechanism of LDO and FeLDO were also investigated in detail. Regeneration experiments show that after three cycles, the removal rate of MO by LDO remains above 80%, while that of FeLDO only remains around 64% in the first cycle after regeneration. This work would provide a new pathway to realize the high-value metal recycling of waste tire-derived CBp and solve the contamination of dye wastewater. Full article
(This article belongs to the Special Issue Rubber Waste and Tyre Stewardship)
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