Ca(OH)2 nanoplates supported on activated carbon for the neutralization/removal of free fatty acids during biodiesel production

Pereira, Marcos Roberto do Nascimento; Salviano, Adriana Barbosa; Medeiros, Tayline Paloma Viana de; Santos, Mariana Rocha Dutra; Cibaka, Thérèse Ebambi; Andrade, Maria Helena Caño de; Porto, Arilza de Oliveira; Lago, Rochel M.

doi:10.1016/j.fuel.2018.01.123

Cited by 13 publications

(8 citation statements)

References 35 publications

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“…It is noted that various methods have been tried to synthesize small Ca(OH) 2 for more than a decade. However, obtaining a uniform, monodispersed, and nanosized Ca(OH) 2 nanomaterial in aqueous solutions is extremely difficult . Although there are a handful of reports on smaller nano Ca(OH) 2 (30–90 nm) in diols, unfortunately, any excess diols are too difficult to wash off and lead to adverse effects when applied to wall painting conservation.…”

Section: Resultsmentioning

confidence: 99%

Graphene‐Enhanced Nanomaterials for Wall Painting Protection

Zhu

Zhang

et al. 2018

Adv Funct Materials

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Wall paintings as the highly valuable treasure have been facing severe damaging problems over the years. Ca(OH) 2 as a promising material to protect them has been studied for more than a decade. However, the synthesis methods are still costly, complex, and usually, involve an organic solvent. In addition, problems such as large particle size (>150 nm), slow and weak carbonation, and low consolidation strength for wall paintings remain unsolved. This study demonstrates an unprecedented concept of wall painting protection enabled by graphene-enhanced nanomaterials through strategically synthesizing Ca(OH) 2 /graphene quantum dot (GQD) nanohybrids using a facile and economic aqueous method. The nanohybrids are uniform and small (center distribution at about 80 nm) and show strong adhesivity to wall painting pigments. In addition, the anti-UV absorption ability of the nanohybrids is also a significant advantage. More importantly, the Ca(OH) 2 is fully carbonated into a stable CaCO 3 crystal phase "calcite" because of the GQD, which is crucial in wall painting consolidation. As a result, the graphene-enhanced nanohybrids show superior conservation efficiency compared to as-synthesized Ca(OH) 2 and commercial Ca(OH) 2 materials. The result opens a new direction for protecting cultural heritage using the newly emerging 2D nanomaterials.

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Section: Resultsmentioning

confidence: 99%

Graphene‐Enhanced Nanomaterials for Wall Painting Protection

Zhu

Zhang

et al. 2018

Adv Funct Materials

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“…Fig. 6 shows the kinetic data for the FFAs at different temperatures as well as their tting plots by applying the pseudo-rst-order and pseudo-second-order models, equations of which are presented in eqn ( 6)- (9). Both the composite membranes showed fast adsorption of FFAs at the rst 30 min.…”

Section: Adsorption Properties Of Ffas On the Pes/ms Composite Membranesmentioning

confidence: 99%

Preparation of polyethersulfone/magnesium silicate membranes via casting and electrospinning and their application in the removal of free fatty acids from biodiesel

et al. 2022

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“…introduced Ca(OH) 2 nanoplates with average dimensions of 100-300 nm and hexagonal shape [40]. Madrid et al produced high-purity hexagonal nano-calcium hydroxide with 200-600 nm size by a precipitation method in N 2 atmosphere and at different temperatures [35].…”

Section: Characteristics Of Green Ca(oh)mentioning

confidence: 99%

“…Darroudi et al reported the preparation of calcium hydroxide nanoparticles with hexagonal structure and average particle size range of 600-650 nm by a facile sol-gel method in aqueous gelatin media [39]. Pereira et al introduced Ca(OH)2 nanoplates with average dimensions of 100-300 nm and hexagonal shape [40]. Madrid et al produced high-purity hexagonal nano-calcium hydroxide with 200-600 nm size by a precipitation method in N2 atmosphere and at different temperatures [35].…”

Section: Characteristics Of Green Ca(oh)mentioning

confidence: 99%

Utilization of Lime Mud Waste from Paper Mills for Efficient Phosphorus Removal

Khan

Ramakrishna

et al. 2019

Sustainability

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In this study, we utilized lime mud waste from paper mills to synthesize calcium hydroxide (Ca(OH)2) nanoparticles (NPs) and investigate their application for the removal of phosphorus from aqueous solution. The NPs, composed of green portlandite with hexagonal shape, were successfully produced using a precipitation method at moderately high temperature. The crystal structure and characterization of the prepared Ca(OH)2 nanoparticles were analyzed by field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. The effects of Ca(OH)2 NP dosage and contact time on removal of phosphorus were also investigated. The results show that the green portlandite NPs can effectively remove phosphorus from aqueous solution. The phosphorus removal efficiencies within 10 min are 53%, 72%, 78%, 98%, and 100% with the different mass ratios of Ca(OH)2 NPs/phosphorus (CNPs/P) of 2.2, 3.5, 4.4, 5.3, and 6.2, respectively. Due to the efficient phosphorus removal, the calcium hydroxide nanoparticles (CNPs) could be a potential candidate for this application in domestic or industrial wastewater treatment.

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Ca(OH)2 nanoplates supported on activated carbon for the neutralization/removal of free fatty acids during biodiesel production

Cited by 13 publications

References 35 publications

Graphene‐Enhanced Nanomaterials for Wall Painting Protection

Graphene‐Enhanced Nanomaterials for Wall Painting Protection

Preparation of polyethersulfone/magnesium silicate membranes via casting and electrospinning and their application in the removal of free fatty acids from biodiesel

Utilization of Lime Mud Waste from Paper Mills for Efficient Phosphorus Removal

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