Modification of ceramic membranes porosity using layer deposition of kaolinite and palygorskite

Misrar, Wafa; Loutou, Mohamed; Saâdi, Latifa; Waqif, Mohamed; Mansori, Mohammed

doi:10.1007/s41779-023-00892-w

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(2 citation statements)

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“…The diffraction peak at 2θ = 29.9 • was assigned to (011) of the silica oxide (SiO 2 ) phase (JCPDS file 01-081-0069). The XRD peaks of the treated-DD3 (Figure 1b) showed a significant increase in intensity, indicating a rise in the clay minerals' crystallinity [56,57,59]. This may be due to the removal of the amorphous layer by the acid, which allowed the X-ray beam to directly access both the octahedral and tetrahedral sites.…”

Section: Statistical Evaluation Criteriamentioning

confidence: 99%

“…The MnO content reached up to 0.71% for DD3 and 0.91% for treated-DD3 because kaolinite DD3 was impure and hence grey in color. The percentage of loss in ignition of DD3 (19.56%) and treated-DD3 (22.58%) resulted from the presence of water in the different minerals (kaolinite, gibbsite, and todorokite)[55][56][57]. The high level of clay material purity created rheological and physico-chemical features and directly impacted on the quality of the ceramic industry raw materials[2].…”

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Enhanced Adsorption Capacity of Methylene Blue Dye onto Kaolin through Acid Treatment: Batch Adsorption and Machine Learning Studies

Hamri,

Imessaoudene,

Hadadi

et al. 2024

Water

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Algerian kaolinite, sourced from Djebel Debbagh nuance 3 (DD3), was used as a low-cost adsorbent to remove methylene blue (MB) dye from water. Its adsorption capacity was enhanced through sulfuric acid treatment (treated-DD3). In response to the urgent demand for clean water, various technologies have been developed to address dye removal from wastewater. This study, specifically delving into the treatment of textile wastewater, examined the efficacy of treated-DD3 through adsorption processes. The acid treatment increased the surface area and pore volume of DD3. X-ray diffraction showed crystalline phases in both, with treated-DD3 having higher crystallinity. Fourier-transform infrared spectroscopy found no significant differences post-acid treatment. Scanning electron microscopy revealed DD3 had large, stacked particles with low surface area, while treated-DD3 had increased porosity and a smoother surface. Various parameters affecting MB adsorption were studied. The Langmuir and Freundlich models were used for isotherm parameters. Treated-DD3 exhibited a higher MB adsorption capacity (64.58 mg/g according to the Langmuir model) than DD3 (44.48 mg/g). Thermodynamic analysis indicated spontaneous and endothermic MB adsorption onto both DD3-BM and treated-DD3-BM systems under different pH conditions. Treated-DD3 effectively reduced chemical oxygen demand (from 304.056 mg/L to 34.44 mg/L) and biological oxygen demand (from 80 mg/L to 20 mg/L) in real textile wastewater. The adsorbent exhibited rapid removal and decolorization, surpassing 93% within the first 7 min of the experiment. The Gaussian process regression and particle swarm optimization (GPR–PSO) predicted MB adsorption capacity effectively (R = 0.9989, R2 = 0.9978, adj-R2 = 0.9978, RMSE = 1.1390, and MAE = 0.3926).

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Section: Statistical Evaluation Criteriamentioning

confidence: 99%

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confidence: 99%