Adsorption of anti-inflammatory drug diclofenac by MgAl/layered double hydroxide supported on Syagrus coronata biochar

This study aimed to evaluate the synthesis of MgAl/LDH from the drying process perspective, evaluating the influence of temperature (75–90 °C) and time (16–20 h) in the drying process. The synthesis was performed, maintaining a ratio of 2:1 of Mg/Al, and the drying was conducted according to a 2 2 experimental design: four axial points and three repetitions at the central point. The surface area and pore diameter ranged from 4.09 to 18.55 m 2 /g and 12.50 to 24.46 nm. Fourier transform infrared (FTIR) analysis indicated the drying-caused variation of the LDH typical bands intensities. Scanning electron microscopy (SEM) images showed the tendency of the increase of agglomeration with the temperature elevation. The drying parameters’ influence was evident for X-ray diffraction (XRD) analysis observing the crystallite size increment, from 13.10 to 38.94 nm, and basal spacing variation, from 7.52 to 7.64 Å. The statistical models for growing crystal and reduction of the basal spacing were physically consistent but with low values of R 2 . The drying time and temperature had a considerable influence on the chemical, physical, structural, and morphological properties of LDH.

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“…A sharp improvement at relatively high pressure evinces that condensation occurs, betoken mesoporosity. 1 , 47 …”

Section: Resultsmentioning

confidence: 99%

“…Changes in particles’ shape can also occur over time, usually increasing the average grain size. 1 , 2 …”

Section: Resultsmentioning

confidence: 99%

Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

et al. 2021

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“…In this sense, the maximum adsorption capacity of caffeine according to the Langmuir model with a MgAl-layered double hydroxide/biochar composite and oxidized biochar from pine needles was 26.22 mg g −1 and 5.350 mg g −1 , respectively. Furthermore, with modified biochar from Moringa oleifera seeds and a composite with MgAl-layered double hydroxide supported on Syagrus coronata biochar, the maximum adsorption capacity of diclofenac by the Langmuir model was 121.1 mg g −1 and 116.5 mg g −1 , respectively [26][27][28][29]. Applications of biochar have been increasing because of its features, including: surface area, pore volume, pore size, pH, cation exchange capacity (CEC), electrical conductivity (EC) and surface functional groups, as well as its sustainability, easy production process, and low cost [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Biochar from Fique Bagasse for Remotion of Caffeine and Diclofenac from Aqueous Solution

2020

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Caffeine and diclofenac are molecules with high human intake, and both belong to the ‘emergent’ class of contaminants. These compounds have been found at different concentrations in many sources of water worldwide and have several negative impacts on aquatic life systems; that is why the search for new alternatives for their removal from aqueous media is of transcendental importance. In this sense, adsorption processes are an option to attack this problem and for this reason, biochar could be a good alternative. In this regard, were prepared six different biochar from fique bagasse (FB), a useless agroindustry by-product from fique processing. The six biochar preparations were characterized through several physicochemical procedures, while for the adsorption processes, pH, adsorption time and concentration of caffeine and diclofenac were evaluated. Results showed that the biochar obtained by pyrolysis at 850 °C and residence time of 3 h, labeled as FB850-3, was the material with the highest adsorbent capacity with values of 40.2 mg g−1 and 5.40 mg g−1 for caffeine and diclofenac, respectively. It was also shown that the experimental data from FB850-3 fitted very well the Redlich–Peterson isotherm model and followed a pseudo-first and pseudo-second-order kinetic for caffeine and diclofenac, respectively.

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“…Then, from the calculated q e coupled with C e we could obtain the isotherm in Figure 5 that shows how the model is associable with the Langmuir model. The Langmuir model assumes that every adsorption is homogeneous, it occurs in monolayers, and every active site has equivalent energy [ 37 ]. It is worth highlighting how the q e values (see ordinate values reported in Figure 5 ) are close to the q 2 (see Table 1 ) obtained for the kinetic model, and this validates the choice of the equilibrium t = 6 h.…”

Section: Resultsmentioning

confidence: 99%

New Eco-Materials Derived from Waste for Emerging Pollutants Adsorption: The Case of Diclofenac

et al. 2020

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This work proposes new eco-materials for the adsorption of diclofenac (DCF). The large consumption of this nonsteroidal anti-inflammatory drug combined with the inefficiency of wastewater treatment plants (WWTPs) leads to its presence in aquatic environments as an emerging pollutant. The adsorption technique is widely used for pharmaceutical removal. Moreover, due to the large effect of commercial adsorbents, in the frame of the Azure Chemistry approach, new sustainable materials are mandatory for removal as emerging pollutants. The work proposes three adsorbents that were obtained from different stabilization methods of fly ash derived from an incinerator plant; the stabilization techniques involved the use of various industrial by-products such as bottom ash, flue gas desulphurization residues, coal fly ash, and silica fume. The best performance, although less than activated carbon, was obtained by COSMOS (COlloidal Silica Medium to Obtain Safe inert: the case of incinerator fly ash), with a removal efficacy of approximately 76% with 15 g/L of material. Several advantages are expected not only from the DCF removal but also from an economic perspective (the newly obtained adsorbents are eco-materials, so they are cheaper in comparison to conventional adsorbents) and in terms of sustainability (no toxic reagents and no heating treatment are involved). This work highlights the adsorption performance of the new eco-materials and their potential use in WWTPs.

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Adsorption of anti-inflammatory drug diclofenac by MgAl/layered double hydroxide supported on Syagrus coronata biochar

Cited by 85 publications

References 78 publications

Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

Biochar from Fique Bagasse for Remotion of Caffeine and Diclofenac from Aqueous Solution

New Eco-Materials Derived from Waste for Emerging Pollutants Adsorption: The Case of Diclofenac

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