Facile sol–gel synthesis of silica sorbents for the removal of organic pollutants from aqueous media

Gomes, Ana Lícia Moura; Andrade, Pedro H. M.; Palhares, Hugo G.; Dumont, Marcello Rosa; Soares, Daniel Crístian Ferreira; Volkringer, Christophe; Houmard, Manuel; Nunes, Eduardo H.M.

doi:10.1016/j.jmrt.2021.10.069

Cited by 13 publications

(11 citation statements)

References 86 publications

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“…also stated in their adsorptive study that at pH above the PCZ, there was a reduction in drug removal due to electrostatic repulsion between the drug that had a negative surface at pH > p K a and the negatively charged surface of the adsorbent. This represents the same occurrence as in the adsorption of dipyrone at pH 6–10, given that at pH above p K a , the sulfonate group is deprotonated, corroborating that dipyrone has a negatively charged surface 17,18 and the surface of the adsorbent in question was also negative at pH > 4.…”

Section: Resultssupporting

confidence: 70%

“…Comparing recent works concerned with removing dipyrone through adsorption, 2,15,17‐21 it is noted that the maximum capacity of biomass ash exceeded that of several adsorbents studied in the literature. It should be noted that this is an adsorbent with negligible cost and competitive results.…”

Section: Resultsmentioning

confidence: 98%

“…At pH values below p K a , dipyrone is neutral 18 and the adsorbent has a positive surface charge, as evidenced by the zeta potential. That said, it can be stated that at this pH the removal was not favored due to electrostatic attraction.…”

Section: Resultsmentioning

confidence: 99%

“…Another mechanism is due to π bonds, which occur between the aromatic ring of dipyrone and alkenes, alkynes and CO present in the ash. And finally, there is the mechanism of electron donor–acceptor complexing that happens due to oxygen donating electrons to the aromatic ring of dipyrone that receives these electrons 18,70 …”

Section: Resultsmentioning

confidence: 99%

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Valorization of biomass ash for the effective removal of dipyrone from water: an efficient and low‐cost option

Oliveira

Reck

Resende

et al. 2023

J of Chemical Tech & Biotech

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Background: In order to propose a destination for the bottom ash generated from biomass burning, its morphology, functional groups and mineral phases were studied. Dipyrone has been extensively used as an antipyretic, increased due to cases of COVID-19, and due to excretion by urine, incorrect disposal and industrial effluents has been destined to wastewater, being harmful to human and animal life. The present study proposes using biomass ash for the adsorption of dipyrone.Results: The characterization of biomass ash shows a sufficient surface area size for adsorption, and a mainly amorphous structure with some peaks of quartz, calcite and other mineral phases. The results show that the kinetic model which best describes the adsorption is the pseudo-first-order model. The Langmuir model best fits at 25 °C, and the Freundlich model best describes the adsorption at 35 and 45 °C. The thermodynamic parameters indicated that the process is endothermic with a maximum adsorptive capacity of 65.27 mg g −1 . In addition, the adsorption is spontaneous, disordered and chemical. The ionic strength study reveals that the adsorbent is promising for real effluent treatment and there is evidence that electrostatic interaction is not the primary adsorptive mechanism, agreeing with the result obtained from pH testing. The proposed mechanism for dipyrone removal involves hydrogen bonds, π bonds and electron donor-acceptor complex.Conclusions: The results are promising in comparison with recent literature and solve two environmental problems: biomass bottom ash disposal and pharmaceutical removal in aqueous medium. The ash may be regarded as a low-cost and environmentally friendly adsorbent.

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Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Valorization of biomass ash for the effective removal of dipyrone from water: an efficient and low‐cost option

Oliveira

Reck

Resende

et al. 2023

J of Chemical Tech & Biotech

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“…The common adsorbents used are clay, activated carbon, biochar, sand and silica [9][10][11]. The valorization of solid agricultural wastes as precursors for adsorbents synthesis is of high interest because it's low cost and in the same time represents a good way to solve the problem of their disposal in the environment.…”

Section: Introductionmentioning

confidence: 99%

Batch mode treatment of wastewater from the Maroua artisanal tannery using silica extracted from rice husks and silica/sand mixture

Dikdim¹,

Djinsi²,

Tsamo³

2022

equilibrium

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ABSTRACT. Tanning activity consumes high volumes of water resulting in large volumes of highly colored polluted wastewater being discharged to the environment. In this study, the discoloration of the wastewater of the local artisanal tannery using SiO2 synthesized from rice husks and silica/sand mixture at different process conditions was investigated. The results revealed that the discoloration process is favorable for both adsorbents at 35oC with maximum of 61% for sand/SiO2 mixture system and 64% for SiO2 system. The presence of NaCl electrolyte enhanced the discoloration for both adsorbents increasing from 44% for sand/SiO2 mixture at 0 NaCl to 72% at 0.5M NaCl and from 49% for SiO2 system at 0 NaCl to 63 % at 0.5M NaCl. Increasing the amount of sand from 0.2 to 1 g at fixed SiO2 of 0.1 g in sand/SiO2 mixture showed discoloration from 40-41 % while increasing SiO2 in SiO2 alone system from 0.05 to 0.5 g had a discoloration of 45-71%. Results of this study shows that sand a very abundant local and worldwide material can be complemented with silica in a very low cost tannery wastewater discoloration process.Keywords:Tannery, Wastewater, Silica, Sand, Discoloration

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Facile, fast, and green preparation of high-purity and quality silica nanoparticles using a handmade ball mill: comparison with the sol–gel method

et al. 2023

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Facile sol–gel synthesis of silica sorbents for the removal of organic pollutants from aqueous media

Cited by 13 publications

References 86 publications

Valorization of biomass ash for the effective removal of dipyrone from water: an efficient and low‐cost option

Valorization of biomass ash for the effective removal of dipyrone from water: an efficient and low‐cost option

Batch mode treatment of wastewater from the Maroua artisanal tannery using silica extracted from rice husks and silica/sand mixture

Facile, fast, and green preparation of high-purity and quality silica nanoparticles using a handmade ball mill: comparison with the sol–gel method

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