ArticleEnvironmental science and pollution research international2021
Impact of pyrolysis temperature and activation on oily sludge-derived char for Pb(II) and Cd(II) removal from aqueous solution.
Article in Environmental science and pollution research international, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed, 15 citations in OpenAlex.
- Conversion of Oil-Containing Residue from Waste Oil Recycling Plant into Porous Carbon Materials Through Activation Method with Phosphoric Acid.Materials (Basel, Switzerland) · 2024Article
- Production of Mesoporous Magnetic Carbon Materials from Oily Sludge by Combining Thermal Activation and Post-Washing.Materials (Basel, Switzerland) · 2022Article
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4 authors at 2 institutions in 2 countries.
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Abstract
This study investigated the Pb(II) and Cd(II) sorption from aqueous solution by oily sludge-derived char (OSDC) prepared at different pyrolysis temperatures and chemical activation. The maximum Pb(II) sorption capacity for OSDC at pyrolysis temperature of 500 °C (OS500) was found as 351.48 mg/g, which was greater than that of OSDC produced at other temperatures. Post-sorption characterizations using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and sequential extraction test indicated the precipitation was the principal mechanism of sorption of Pb(II) onto OSDC prepared at low pyrolysis temperature (≤ 500 °C). The Pb(II) sorption capacity dramatically decreased as the pyrolysis increased from 500 to 900 °C. This is because the alkaline minerals decomposed at high temperature (≥ 700 °C), thereby the mineral precipitation with Pb(II) was inhibited. With increasing pyrolysis temperature from 500 to 900 °C, the contribution of precipitation to Pb(II) sorption decreased from 93.79 to 34.63%, while the contribution of complexation increased from 0 to 44.68%. The sorption capacity of Cd(II) was less than that of Pb(II), and no precipitation was formed during Cd(II) sorption by OSDC. Sorption results showed that OSDC prepared at pyrolysis temperature of 700 °C (OS700) had the best sorption capacity for Cd(II) (92.14 mg/g). The high sorption capacity of OS700 for Cd(II) was mainly attributed to the carboxyl/hydroxyl functional groups and complexation with mineral oxides. The hydrothermal treatment (8M NaOH solution) activated OS500 significantly with respect to surface area, cation exchange capacity (CEC), and total pore volume (PV). The substitution of Pb(II) with alkaline earth metals led to precipitation in the form of hydrocerussite (Pb
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