Supercritical fluid technology - an eco-friendly approach for resource recovery from e-waste and plastic waste: A review

Preetam, Amrita; Jadhao, Prashant Ram; Naik, Satyanarayan; Pant, Kamal Kishore; Kumar, Vivek

doi:10.1016/j.seppur.2022.122314

Cited by 46 publications

(8 citation statements)

References 134 publications

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“…The average lifespan of a modern-day computer is around three years. The waste computers thus share one-third of the entire global waste,annually produced from electrical and electronic equipment (WEEE) . , Furthermore, the generation of e-waste has caused serious environmental and socio-economic problems . Waste random access memory (WRAM) is an essential component of computers and laptops with in-built volatile memory storage functions .…”

Section: Introductionmentioning

confidence: 99%

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

Preetam,

Modak,

Naik

et al. 2024

ACS Appl. Polym. Mater.

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Recovering gold from electronics waste (e-waste) is essential for conserving valuable resources and reducing improper disposal's environmental impact. However, the selective recovery of gold from e-waste is a significant challenge due to its heterogeneous nature and existing inappropriate recovering processes. Considering these issues, in this study, we investigated a promising approach for recovering gold from waste random access memory (WRAM). For that, we synthesized a porous nanonet polymer (Por-net) through a one-pot Friedel−Crafts polymerization method containing multiple functional groups, i.e., porphyrin and triphenylamine, within a single framework material, acting as a bifunctional chelating ligand. The adsorption results were significantly influenced by the pH conditions. Around 1250 mg g −1 capacity of Au was recovered under realistic experimental conditions in an acidic medium. Moreover, the adsorption isotherm and kinetic study revealed the Langmuir model and pseudo-second-order kinetic fittings for the Au adsorption on Por-net. Properties such as the high surface area and structure of Por-net as well as the Au@Por-net polymer were comprehensively characterized by X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), thermogravimetric analysis (TGA), solid-state 13 C cross-polarization magic angle spinning (CP-MAS) NMR, N 2 sorption analysis field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), electron paramagnetic resonance (EPR), ultraviolet (UV)−visible, time-resolved photoluminescence, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). The results showed its efficient potential for recovering gold from real e-waste sources. Por-net showed excellent desorption efficiency, recyclability, selectivity, and chemical stability. At last, the economic feasibility of Por-net for the purpose of recovering gold from ewaste is also explored. The present work represents a greener and feasible approach to promoting sustainable development, circular economy, and responsible waste management using an effective porous polymer as a scaffold.

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Section: Introductionmentioning

confidence: 99%

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

Preetam,

Modak,

Naik

et al. 2024

ACS Appl. Polym. Mater.

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“…Plastic pollution is becoming a severe threat to the environment on a global scale due to its widespread use in large quantities and slow decomposition. , In fact, the escalating usage of plastics is developing a greater menace, especially concerning microplastic (MP) or nanoplastic (NP) contamination. , These micro- and nanoplastics (MNPs) enter the ecosystem through various channels. For instance, the degradation of existing plastic waste, accumulation of waste from the plastic industry, and food chain transfer may contribute to the spread of MNPs .…”

Section: Introductionmentioning

confidence: 99%

Electrospun Polyurethane Nanofiber Membranes for Microplastic and Nanoplastic Separation

Juraij

Ammed

Chinglenthoiba

et al. 2023

ACS Appl. Nano Mater.

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Multifunctional materials for industrial wastewater treatment are in high demand due to the contamination of microand nanoplastics (MNPs) and dyes. Herein, we demonstrate a polyurethane-based (PU) electrospun composite membrane for MNP separation and selective methylene blue (MB) adsorption. The optimized 20 wt % graphene oxide-montmorillonite (GO-Mt)-loaded nanofibrous composite membrane (20-PGT) exhibited its superhydrophilicity with a water contact angle of 0°and high water flux. It displayed a maximum pressure-driven water flow of 8163 L m −2 h −1 and a gravity-driven water flux of 793 L m −2 h −1 . Three model MNPs, such as acrylonitrile butadiene styrene (ABS), polystyrene (PS), and poly(methyl methacrylate) (PMMA) with various sizes, have been demonstrated. The adsorptive separation and size-exclusive interception mechanisms were observed for nanoplastics (NPs) and microplastics (MPs), respectively. Cake formation, intermediate blocking, and standard blocking mechanisms were followed during the filtration of ABS MPs, PMMA NPs, and PS NPs, respectively. Additionally, the composite membrane exhibited selective MB adsorption from the mixture of dyes, with a maximum adsorption capacity of 417 mg g −1 . Langmuir adsorption isotherm and pseudo-second-order kinetics define the adsorption isotherm and adsorption kinetics, respectively. The fabricated, robust fibrous composite membrane opens a wider door for the removal of MNPs and MB from contaminated water.

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“…Multistage treatment is required to treat different components because of the heterogeneous nature of PCBs. Pyrolysis, supercritical fluids, solvent dissolution, and incineration are widely used processes to treat the polymeric fraction. − Similarly, for the metal fraction recovery, well-known metallurgical processes such as physical, hydrometallurgical, and pyrometallurgical processes are being used. − Pyrometallurgical processes are effective processes; however, high energy requirements and emission of secondary pollutants are major drawbacks. ,, Hydrometallurgical processes use corrosive or toxic lixiviants such as cyanide, thiosulfate, thiourea, halides, ammonia–ammonium salt, aqua regia, nitric acid, sulfuric acid, hydrochloric acid, etc . Lately, the use of physical separation techniques for metal recovery is getting a lot of attention because of their low-cost operation, easy handling, and efficient and environment-friendly approach.…”

Section: Introductionmentioning

confidence: 99%

Integrated Approach for Metallic Fraction Recovery and Generation of Valuable Products from Electronic Waste

Jadhao

Panda

Pant

et al. 2023

Ind. Eng. Chem. Res.

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The presence of metals and plastics makes electronic waste (e-waste) a secondary source for metal recovery and energy generation. In this study, an integrated approach is demonstrated to recover the metallic fraction and generate valuable products from e-waste using pyrolysis and ultrasonication. E-waste pyrolysis under the optimized process conditions of 500 °C temperature and 30 min of pyrolysis time resulted in 77 wt % solid, 5 wt % oil, and 18 wt % gas products. Calorific values of gas and oil products are 30 MJ/m3 and 34 MJ/kg, respectively. The oil product mainly comprises phenyl ring compounds, whereas H2 and CH4 are the main constituents of the gaseous stream. A solid product is further subjected to ultrasound for 30 min which leads to the metallic fraction recovery with an efficiency of 90 wt %. The investigation reveals that an integrated methodology may provide a solution for the sustainable management of e-waste and resource recovery.

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Supercritical fluid technology - an eco-friendly approach for resource recovery from e-waste and plastic waste: A review

Cited by 46 publications

References 134 publications

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

Electrospun Polyurethane Nanofiber Membranes for Microplastic and Nanoplastic Separation

Integrated Approach for Metallic Fraction Recovery and Generation of Valuable Products from Electronic Waste

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