Adsorption capacity of methylene blue, an organic pollutant, by montmorillonite clay

Abstract

The isotherms and kinetics of the adsorption of a cationic dye in aqueous solution, methylene blue, on a local Algerian montmorillonite clay mineral (raw, sodium and thermally activated at 300 and 500˚C) were determined experimentally. Various parameters influencing the adsorption were optimized, mainly solid-liquid contact time, mass of adsorbent, initial concentration of dye, pH of the solution and temperature. Results showed that the adsorption kinetics were fast: 30 min for the raw clay mineral, and 20 min for sodium clay mineral (SC) and thermally activated at 300˚C, whereas with the clay mineral calcined at 500˚C, the equilibrium was reached after 150 min only. The maximum adsorption capacity was reached at pH 6.6. Results deducted from the adsorption isotherms also showed that the retention follows the Langmuir model. In addition, it was found that the kinetics were in the order of 2 (K = 2.457 × 10 6 g/mg.h) for sodium clay and were limited by an intra-particle diffusion. SC was found to be a better adsorbent to remove methylene blue from industrial wastewater.

Synthesis and Characterization of High-Performing Sulfur-Free Tannin Foams

“…Further, the capacity of the material to act as a filter against organic and emerging pollutants such as methylene blue and sodium dodecyl sulfate [34,35] is evaluated and reported in Figure 8. It was observed that the foams are able to recover from 42% to 55% of methylene blue and from 15% to 27% of SDS.…”

Feasibility of montmorillonite-assisted adsorption process for the effective treatment of organo-pesticides

“…Therefore, the suitability of low-cost and renewable adsorbents, particularly clay-based derivatives has drawn great attention for the remediation of toxic pollutants [9]. Of major interest, montmorillonite has been proposed to be a good candidate [10], evidence from the intercalation of water pollutants by the modification of d(0 0 1) reflection [11][12][13][14][15][16].…”

“…The shift in the intercalated montmorillonites was related to the local environment of the interlayer space. Results indicated the 1-3 ppm upfield chemical shift for the end-methyl (δC16 ) and methylene (δC15 , δC[2][3][4][5][6][7][8][9][10][11][12][13][14] …”

Non‐Conventional Adsorbents for Dye Removal

“…Good removal capability of clay materials to uptake dye was previously demonstrated by Bagane and Guiza [53], Harris et al [54], Ghosh and Bhattacharyya [55], Espantaleon et al [56], Al-Ghouti et al [57], Shawabkeh and Tutunji [58], Atun and Hisarli [59], Ozdemir et al [60], Özcan et al [61], and Tsai et al [62], and more recently by Demirbas and Alkan [63], Feddal et al [64], and Vanaamudan et al [65]. For instance, the removal performance of Fuller's earth and CAC for Basic Blue 9 was compared by Atun and Hisarli [59].…”