Montmorillonite- hydrothermal carbon nanocomposites: Synthesis, characterization and evaluation of pesticides retention for potential treatment of agricultural wastewater

Soulé, M.E. Zelaya; Fernández, Mariela Alejandra; Montes, María Luciana; Suárez-Garcı́a, Fabián; Sánchez, Rosa M. Torres; Tascón, J.M.D.

doi:10.1016/j.colsurfa.2019.124192

Cited by 16 publications

(4 citation statements)

References 61 publications

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“…Ramola et al demonstrated that co-pyrolysis of bentonite and biomass composites impacts yield, surface texture, and the degree of carbonization, significantly increasing the surface area and adsorption capacity of the resulting heterogeneous biochars [31]. Likewise, montmorillonite (a primary component of the bentonite clay used in this work) has been shown to improve the nutrient retention of both biochars [32] and hydrochars [33] for potential use as soil amendments. Considerable work has been conducted to understand the impact of thermochemical processing parameters including temperature, residence time, and the biomass-to-water ratio (for HTC only), especially in terms of solid yield, carbon content, and higher heating values.…”

Section: Introductionmentioning

confidence: 71%

Impact of Bentonite Clay on In Situ Pyrolysis vs. Hydrothermal Carbonization of Avocado Pit Biomass

et al. 2022

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Biofuels produced via thermochemical conversions of waste biomass could be sustainable alternatives to fossil fuels but currently require costly downstream upgrading to be used in existing infrastructure. In this work, we explore how a low-cost, abundant clay mineral, bentonite, could serve as an in situ heterogeneous catalyst for two different thermochemical conversion processes: pyrolysis and hydrothermal carbonization (HTC). Avocado pits were combined with 20 wt% bentonite clay and were pyrolyzed at 600 °C and hydrothermally carbonized at 250 °C, commonly used conditions across the literature. During pyrolysis, bentonite clay promoted Diels–Alder reactions that transformed furans to aromatic compounds, which decreased the bio-oil oxygen content and produced a fuel closer to being suitable for existing infrastructure. The HTC bio-oil without the clay catalyst contained 100% furans, mainly 5-methylfurfural, but in the presence of the clay, approximately 25% of the bio-oil was transformed to 2-methyl-2-cyclopentenone, thereby adding two hydrogen atoms and removing one oxygen. The use of clay in both processes decreased the relative oxygen content of the bio-oils. Proximate analysis of the resulting chars showed an increase in fixed carbon (FC) and a decrease in volatile matter (VM) with clay inclusion. By containing more FC, the HTC-derived char may be more stable than pyrolysis-derived char for environmental applications. The addition of bentonite clay to both processes did not produce significantly different bio-oil yields, such that by adding a clay catalyst, a more valuable bio-oil was produced without reducing the amount of bio-oil recovered.

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Section: Introductionmentioning

confidence: 71%

Impact of Bentonite Clay on In Situ Pyrolysis vs. Hydrothermal Carbonization of Avocado Pit Biomass

et al. 2022

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“…The rough surface and complex void structure increased the effective contact area between the hydrochar and MB, thus facilitating the adsorption reaction. The surface of the NaHCO3-modified hydrochar also exhibited a certain roughness accompanied by the stacking of lamellar fragments, which may be attributed to the loading of montmorillonite [29].…”

Section: Sem Analysismentioning

confidence: 96%

Simple Alkali-Modified Persimmon Peel–Montmorillonite Composite Hydrochar for Rapid and Efficient Removal of Methylene Blue

Chai

Gao

et al. 2023

Sustainability

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Modified persimmon peel–montmorillonite composites (PMHC-KOH/NaHCO3) for efficient and rapid removal of methylene blue (MB) were synthesized using hydrothermal carbonization and simple alkali impregnation. The surface properties and material compositions of the hydrochars were determined with SEM, zeta potential, and XRD, and the adsorption mechanism of MB on two modified hydrochars was analyzed with FTIR, XPS, and DFT calculation. The results showed that modified hydrochars with a rough surface structure and rich oxygen-containing groups exhibited a strong affinity for MB, and the adsorption capacity of PMHC-NaHCO3 and PMHC-KOH for MB reached 121.28 mg/g and 278.41 mg/g, respectively, with PMHC-KOH achieving more rapid adsorption of MB, at a rate of 0.043 g/mg/min. After five adsorption/desorption cycles, the two modified hydrochars still maintained a high adsorption rate of MB (92.32%/98.43%). The excellent adsorption performance of the modified hydrochars was attributed to hydrogen bonding, π-π interaction, electrostatic attraction, and ion exchange. DFT calculations revealed that oxygen-containing groups of the modified hydrochars played an important role in the adsorption of MB and confirmed that electrostatic attraction, hydrogen bonding, and π-π interactions were the key forces for rapid and efficient adsorption of MB. The prepared adsorbents gave full play to the regenerative applicability of agricultural waste, the simple alkali impregnation method eliminated the need for the additional cost of pyrolysis and activation, and their application in MB adsorption realized the treatment of waste with waste.

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“…According to Zelaya Soulé et al [1], hydrothermal synthesis emerges as an environmentally friendly and low-cost alternative to conventional carbon synthesis, it is carried out at a low temperature (210 °C) and does not involve strong solvents. The products developed with dextrose as the carbon source, as MD-210 and MDac3-210-500, presented a large amount of oxygenated groups on their surface, with double bonds and aromatic groups, which intervened in the adsorption process of NFX [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…The large number of oxygenated groups, double bonds, and aromatic groups of the hydrothermal carbons [2,3] that can absorb light, raises the possibility that they could favor the indirect photolysis of adsorbed pollutants. In this sense, this work hypothesizes that these organic groups in carbon-clay nanocomposites (MD-210, and MDac3-210-500) could benefit the photodegradation of adsorbed NFX, when compared to NFX adsorbed on M. This hypothesis arose as a consequence of two observations:…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of norfloxacin adsorbed on clay and carbon-clay nanomaterials: an evaluation based on antimicrobial tests

Zelaya-Soulé¹,

Horue²,

Sánchez³

et al. 2022

Comptes Rendus. Chimie

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The antibiotic norfloxacin was adsorbed on clay and carbon-clay nanocomposites (MD-210 and MDac3-210-500, synthesized by hydrothermal carbonization of dextrose) but maintained its antimicrobial activity once adsorbed. To degrade it, direct (DP) and indirect (IP, with sulfate radicals) photolysis were performed. Antimicrobial activity tests were performed to evaluate the degradation generated. There were no significant differences between DP and IP for unabsorbed norfloxacin solution. The IP treatment caused a loss of antibiotic activity in all cases. For DP, the carbon samples showed better results than those of clay, evidencing the importance of oxygenated carbonaceous groups in the photolysis of norfloxacin.

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Montmorillonite- hydrothermal carbon nanocomposites: Synthesis, characterization and evaluation of pesticides retention for potential treatment of agricultural wastewater

Cited by 16 publications

References 61 publications

Impact of Bentonite Clay on In Situ Pyrolysis vs. Hydrothermal Carbonization of Avocado Pit Biomass

Impact of Bentonite Clay on In Situ Pyrolysis vs. Hydrothermal Carbonization of Avocado Pit Biomass

Simple Alkali-Modified Persimmon Peel–Montmorillonite Composite Hydrochar for Rapid and Efficient Removal of Methylene Blue

Photodegradation of norfloxacin adsorbed on clay and carbon-clay nanomaterials: an evaluation based on antimicrobial tests

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