Synthesis of low-density polyethylene derived carbon nanotubes for activation of persulfate and degradation of water organic micropollutants in continuous mode

Ribeiro, Rui S.; Vieira, Octávia; Fernandes, Rita; Roman, Fernanda F.; Tuesta, Jose L. Díaz de; Silva, Adrián M.T.; Gomes, Helder

doi:10.1016/j.jenvman.2022.114622

Cited by 24 publications

(10 citation statements)

References 59 publications

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“…Many compounds have been used as supporting materials, including CaO, SiO 2 , zeolite, CuBr, Al 2 O 3 , MgO, TiO 2 , cordierite, montmorillonite, citric acid, activated carbon, and char. Gong et al 2015b , Gong et al 2012b ; Modekwe et al 2021 ; Ribeiro et al 2022 ; Song et al 2007 ; Thivasasith et al 2022 ; Veksha et al 2022 ; Wang et al 2020 ; Wu and Williams 2009 ; Xu et al 2021a ; Yang et al 2020 , Yang et al 2015 ; Yao et al 2021b , Yao et al 2018a , Yao et al 2018b , Yao et al 2017 ; Zhang et al 2022 Synthesis methods Two-stage Two-stage (pyrolysis and catalysis) method consists of two independent reactors which can be separately heated and controlled. It is the most frequently used approach to fabricate high-quality CNTs from plastics, and is suitable for continuous fabrication, but the carbon yield is usually below 20%.…”

Section: Morphology Control Of Carbonaceous Materialsmentioning

confidence: 99%

“… Acomb et al 2015 ; Elbaba and Williams 2012 ; Xu et al 2021a , Xu et al 2021b , Xu et al 2020 Mixed catalysts Various kinds of metallic compounds can be mixed to accelerate the formation of CNTs, such as Ni, Co, Fe, Al, Mg, Mn, Mo, and stainless steel. Aboul-Enein and Awadallah 2018 ; Haggar et al 2022 ; Jia et al 2022 ; Panahi et al 2019 ; Ribeiro et al 2022 ; Veksha et al 2022 ; Wu et al 2014 ; Yang et al 2015 ; Yao et al 2022 , Yao et al 2021a Supporting materials Supporting materials are commonly combined with transition metals to alleviate the coalescence and sintering of catalysts and then facilitate the formation of CNTs. Many compounds have been used as supporting materials, including CaO, SiO 2 , zeolite, CuBr, Al 2 O 3 , MgO, TiO 2 , cordierite, montmorillonite, citric acid, activated carbon, and char.…”

Section: Morphology Control Of Carbonaceous Materialsmentioning

confidence: 99%

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Structure-oriented conversions of plastics to carbon nanomaterials

Ren

et al. 2022

carbon res

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The accumulation of waste plastics has caused serious environmental issues due to their unbiodegradable nature and hazardous additives. Converting waste plastics to different carbon nanomaterials (CNMs) is a promising approach to minimize plastic pollution and realize advanced manufacturing of CNMs. The reported plastic-derived carbons include carbon filaments (i.e. carbon nanotubes and carbon nanofibers), graphene, carbon nanosheets, carbon sphere, and porous carbon. In this review, we present the influences of different intrinsic structures of plastics on the pyrolysis intermediates. We also reveal that non-charring plastics are prone to being pyrolyzed into light hydrocarbons while charring plastics are prone to being pyrolyzed into aromatics. Subsequently, light hydrocarbons favor to form graphite while aromatics are inclined to form amorphous carbon during the carbon formation process. In addition, the conversion tendency of different plastics into various morphologies of carbon is concluded. We also discuss other impact factors during the transformation process, including catalysts, temperature, processing duration and templates, and reveal how to obtain different morphological CNMs from plastics. Finally, current technology limitations and perspectives are presented to provide future research directions in effective plastic conversion and advanced CNM synthesis.

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Section: Morphology Control Of Carbonaceous Materialsmentioning

confidence: 99%

Section: Morphology Control Of Carbonaceous Materialsmentioning

confidence: 99%

Structure-oriented conversions of plastics to carbon nanomaterials

Ren

et al. 2022

carbon res

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“…As metallic particles are inside the nanotubes, purification methods are not able to remove them without destroying the whole structure. Nevertheless, the metallic phases can work as active phases for the catalytic application of the CNTs and are typically protected against deactivation mechanisms, such as leaching [19]. The outer diameters reported here are similar to previously reported values for polymer-derived CNTs: 37-44 nm for polyolefin-derived CNTs [12], 4-63 nm for LDPE-derived CNTs [19], 1-40 nm for a mixture of polyolefins [37], and 5-25 nm for polyolefins and polystyrene-derived CNTs [38].…”

Section: Carbon Nanotubesmentioning

confidence: 99%

“…Even though recycling rates for packaging plastics have increased, data from 2020 indicate that around 23% of plastic packaging is still sent to landfills [18]. However, since polyolefins are primarily made of carbon (i.e., low-and high-density polyethylene, LDPE and HDPE, respectively, and polypropylene, PP, are made up of 85.6% of carbon), they can be converted into carbon-based nanostructured materials (CNMs), such as carbon nanotubes (CNTs) [19][20][21][22][23][24][25], graphene [26], or others [27]. Specifically, CNTs can be produced via chemical vapor deposition (CVD) using the solid PSW as a carbon precursor [28].…”

Section: Introductionmentioning

confidence: 99%

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Carbon Nanomaterials from Polyolefin Waste: Effective Catalysts for Quinoline Degradation through Catalytic Wet Peroxide Oxidation

Roman,

De Grande Piccinin,

Santos Silva

et al. 2023

Catalysts

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Quinoline (QN) is highly toxic and carcinogenic and has been detected in soil, groundwater, and biological tissues. Advanced oxidation processes (AOPs) have shown promise to address its degradation in wastewater treatment, with catalytic wet peroxide oxidation (CWPO) being highlighted due to its cost-effectiveness and mild operation. However, developing active and inexpensive catalysts is crucial for CWPO’s effectiveness. Another pressing issue is the accumulation of mixed, dirty plastic solid waste (PSW), particularly polyolefins used in packaging. Although recycling rates have increased, much plastic packaging remains in landfills. However, polyolefins can be converted into carbon-based nanostructured materials (CNMs), such as carbon nanotubes (CNTs), through chemical vapor deposition (CVD) using PSW as a carbon precursor. While many studies focus on CNT preparation, their application is often overlooked. In this context, this work proposes the preparation of CNMs, particularly CNTs, through CVD using a single-stage pyrolysis reactor. Polyolefins (LDPE, HDPE, and PP), both individually and in a mixture simulating PSW, were used as carbon sources. Given a sufficiently high temperature, the desired CNT architecture was successfully synthesized regardless of the starting polymer. These CNMs were then tested as catalysts for CWPO in simulated wastewater containing QN. The results showed a rapid degradation of QN (30–120 min) and high removals of total organic carbon (TOC) and aromatic compounds (75% and >90%, respectively), demonstrating the applicability of PSW-derived CNTs in the CWPO process for QN abatement.

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Polymer Waste Valorization into Advanced Carbon Nanomaterials for Potential Energy and Environment Applications

Pattanshetti,

Koli,

Dhabbe

et al. 2024

Macromol. Rapid Commun.

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The rise in universal population and accompanying demands have directed towards an exponential surge in the generation of polymeric waste. The estimate predicts that world‐wide plastic production will rise to approximately 590 million metric tons by 2050, whereas 5000 million more tires will be routinely abandoned by 2030. Handling this waste and its detrimental consequences on the Earth's ecosystem and human health presents a significant challenge. Converting the wastes into carbon‐based functional materials viz. activated carbon, graphene, and nanotubes is considered the most scientific and adaptable method. Herein, we provide an overview of the various sources of polymeric wastes, modes of build‐up, impact on the environment, and management approaches. Update on advances and novel modifications made in methodologies for converting diverse types of polymeric wastes into carbon nanomaterials over the last five years are given. A remarkable focus has been made to comprehend the applications of polymeric waste derived carbon nanomaterials (PWDCNMs) in the CO2 capture, removal of heavy metal ions, supercapacitor‐based energy storage and water splitting with an emphasis on the correlation between PWDCNMs' properties and their performances. This review offers insights into emerging developments in the upcycling of polymeric wastes and their applications in environment and energy.This article is protected by copyright. All rights reserved

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Synthesis of low-density polyethylene derived carbon nanotubes for activation of persulfate and degradation of water organic micropollutants in continuous mode

Cited by 24 publications

References 59 publications

Structure-oriented conversions of plastics to carbon nanomaterials

Structure-oriented conversions of plastics to carbon nanomaterials

Carbon Nanomaterials from Polyolefin Waste: Effective Catalysts for Quinoline Degradation through Catalytic Wet Peroxide Oxidation

Polymer Waste Valorization into Advanced Carbon Nanomaterials for Potential Energy and Environment Applications

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