Potential applications of spent adsorbents and catalysts: Re-valorization of waste

Rial, Juliana Belen; Ferreira, Marı́a Luján

doi:10.1016/j.scitotenv.2022.153370

Cited by 46 publications

(19 citation statements)

References 86 publications

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“…Exploring new routes for reusing spent adsorbents is a persistent and challenging task that requires considerable effort to tackle. Rial et al 14 . Recently reviewed the reported approaches to valorizing spent wastewater adsorbents.…”

Section: Introductionmentioning

confidence: 99%

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Valorization of spent double substituted Co–Ni–Zn–Fe LDH wastewater nanoadsorbent as methanol electro-oxidation catalyst

Mahmoud

Mohamed

Hafez

et al. 2022

Sci Rep

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Finding suitable non-expensive electrocatalyst materials for methanol oxidation is a significant challenge. Waste valorization of spent wastewater nanoadsorbents is a promising route toward achieving circular economy guidelines. In this study, the residual of layered double hydroxide (LDH) can be used as an electrocatalyst in direct methanol fuel cells as a novel approach. The Co–Ni–Zn–Fe LDH was prepared by the co-precipitation method followed by the adsorption of methyl orange (MO). Moreover, the spent adsorbent was calcined at different temperatures (200, 400, and 600 °C) to be converted to the corresponding mixed metal oxides (MMO). The prepared samples were characterized using XRD, FTIR, HRTEM, zeta potential, and hydrodynamic size measurements. The spent adsorbent was tested as an electro-catalyst for direct methanol electro-oxidation. The spent LDH/MO adsorbent showed a maximum current density of 6.66 mA/cm2 at a 50 mV/s scan rate and a 1 M methanol concentration. The spent MMO/MO adsorbent showed a maximum current density of 8.40 mA/cm2 at a 200 °C calcination temperature, 50 mV/s scan rate, and a 3 M methanol concentration. Both samples show reasonable stability over time, as indicated by the chronoamperometric response. Further nanoengineering of used nanoadsorbents could be a promising path to repurposing these wastes as electro-oxidation catalysts.

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Section: Introductionmentioning

confidence: 99%

“…Recently reviewed the reported approaches to valorizing spent wastewater adsorbents. Such approaches include recycling them as catalysts for chemical synthesis, re-applying them as further adsorbents for other pollutants, their usage as cementitious fillers, and/or their usage in some miscellaneous industrial applications 14 .…”

Section: Introductionmentioning

confidence: 99%

Valorization of spent double substituted Co–Ni–Zn–Fe LDH wastewater nanoadsorbent as methanol electro-oxidation catalyst

Mahmoud

Mohamed

Hafez

et al. 2022

Sci Rep

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“…Considering the inexpensive cost and sustainable preparation process, the recovery and regeneration process of spent biochar catalysts seems unnecessary. Alternatively, it is appropriate to explore applications for spent catalysts to avoid secondary waste generation …”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, it is appropriate to explore applications for spent catalysts to avoid secondary waste generation. 16 Soil salinization, as well as heavy metals and organic compounds contamination, have become increasingly severe soil issues with the booming population and economies. Incorporation of biochar into the soil as a conditioner or fertilizer is an ecologically sound and economically attractive method.…”

Section: Introductionmentioning

confidence: 99%

Biochar-Assisted Catalytic Pyrolysis of Oily Sludge to Attain Harmless Disposal and Residue Utilization for Soil Reclamation

Lin

et al. 2023

Environ. Sci. Technol.

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Pyrolysis of oily sludge (OS) is a feasible technology to match the principle of reduction and recycling; however, it is difficult to confirm the feasible environmental destination and meet the corresponding requirements. Therefore, an integrated strategy of biochar-assisted catalytic pyrolysis (BCP) of OS and residue utilization for soil reclamation is investigated in this study. During the catalytic pyrolysis process, biochar as a catalyst intensifies the removal of recalcitrant petroleum hydrocarbons at the expense of liquid product yield. Concurrently, biochar as an adsorbent can inhibit the release of micromolecular gaseous pollutants (e.g. HCN, H 2 S, and HCl) and stabilize heavy metals. Due to the assistance of biochar, pyrolysis reactions of OS are more likely to occur and require a lower temperature to achieve the same situation. During the soil reclamation process, the obtained residue as a soil amendment can not only provide a carbon source and mineral nutrients but can also improve the abundance and diversity of microbial communities. Thus, it facilitates the plant germination and the secondary removal of petroleum hydrocarbons. The integrated strategy of BCP of OS and residue utilization for soil reclamation is a promising management strategy, which is expected to realize the coordinated and benign disposal of more than one waste.

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“…Other management strategies include using the adsorbents as catalysts, capacitors, catalyst supports, sensors, and cement additives. In another recent review, Rial and Ferreira 4 further detailed numerous uses for spent wastewater adsorbents. The authors cited several studies that successfully reused spent adsorbents as catalysts, as construction material fillers, as components in industrial products, and in further environmental remediation applications.…”

Section: Introductionmentioning

confidence: 99%

Waste Valorization of a Recycled ZnCoFe Mixed Metal Oxide/Ceftriaxone Waste Layered Nanoadsorbent for Further Dye Removal

et al. 2022

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Waste valorization of spent wastewater nanoadsorbents is a promising technique to support the circular economy strategies. The terrible rise of heavy metal pollution in the environment is considered a serious threat to the terrestrial and aquatic environment. This led to the necessity of developing cost-effective, operation-convenient, and recyclable adsorbents. ZnCoFe mixed metal oxide (MMO) was synthesized using co-precipitation. The sample was characterized using X-ray powder diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. Factors affecting the adsorption process such as pH, the dose of adsorbent, and time were investigated. ZnCoFe MMO showed the maximum adsorption capacity of 118.45 mg/g for ceftriaxone sodium. The spent MMO was recycled as an adsorbent for malachite green (MG) removal. Interestingly, the spent adsorbent showed 94% removal percent for MG as compared to the fresh MMO (90%). The kinetic investigation of the adsorption process was performed and discussed. In addition, ZnCoFe MMO was tested as an antimicrobial agent. The proposed approach opens up a new avenue for recycling wastes after adsorption into value-added materials for utilization in adsorbent production with excellent performance as antimicrobial agents.

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Potential applications of spent adsorbents and catalysts: Re-valorization of waste

Cited by 46 publications

References 86 publications

Valorization of spent double substituted Co–Ni–Zn–Fe LDH wastewater nanoadsorbent as methanol electro-oxidation catalyst

Valorization of spent double substituted Co–Ni–Zn–Fe LDH wastewater nanoadsorbent as methanol electro-oxidation catalyst

Biochar-Assisted Catalytic Pyrolysis of Oily Sludge to Attain Harmless Disposal and Residue Utilization for Soil Reclamation

Waste Valorization of a Recycled ZnCoFe Mixed Metal Oxide/Ceftriaxone Waste Layered Nanoadsorbent for Further Dye Removal

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