One-pot preparation of MnO_ximpregnated cotton fibers for methylene blue dye removal

Abstract

Using natural cotton fibers (CF) as a matrix, a series of novel MnO x impregnated cotton fibers (designated as Mn-X@BCF) were prepared in this study through a one-pot sono-assisted KMnO 4 reduction process with no additional reducers. The as-prepared Mn-X@BCF was covered by a uniform and dense layer of MnO x nanospheres (10-30 nm), the amount of which was significantly improved by CF pretreatment and linearly correlated with KMnO 4 concentration. Specifically, when KMnO 4 concentrations increased from 5 mmol L À1 to 100 mmol L À1 , the impregnation ratios of MnO x on BCF increased from 0.34% to 14.98% accordingly. Mn-X@BCF showed substantial removal for the typical dye MB. Under the studied conditions, MB removal equilibrium was reached within 10 minutes and solution pH showed no significant influence over a wide pH range (2-11). MB adsorption by Mn-25@BCF obeyed the pseudosecond-order kinetic model and Langmuir model well. The calculated maximum adsorption capacity (Q m ) of Mn-25@BCF was 46.3 mg g À1 , close to the cumulative adsorption capacity (Q c 45 mg g À1 ) of MB determined during the eight cycles of adsorption. It was proposed that adsorption followed by partial oxidation was the main mechanism of MB removal by Mn-X@BCF. The as-prepared Mn-25@BCF has great potential as an efficient and low-cost material for dye wastewater treatment because of its inexpensive and renewable source of raw materials, fast MB removal kinetics, wide working pH range and easy solid-liquid separation.

Ecofriendly Synthesis of Magnetic Composites Loaded on Rice Husks for Acid Blue 25 Decontamination: Adsorption Kinetics, Thermodynamics, and Isotherms

“…All obtained experimental data were meticulously charted and subjected to analysis using Origin Pro 2022 (Version Number 225 (9.9.0.225)). The assessment of adsorption efficiency (expressed as R (%)) was conducted through the utilization of the subsequent equation [35,36]:…”

Intercalating methylene blue in molecular beacon for sensitive detection of salivary TNF-α towards early diagnosis of oral cancer

“…3b). Simultaneously, the S2p peaks at 163.8 eV, 165.09 eV and 168.0 eV can be assigned to C-S-C of MB, 35 C-S-C of streptavidin 36 and SO 3 2− of biotin, 37 respectively (Fig. 3d).…”

Degradation of methylene blue with magnetic Co-doped Fe3O4@FeOOH nanocomposites as heterogeneous catalysts of peroxymonosulfate

“…28 The decolorization and mineralization efficiency of MB were calculated with eqn (9) and (10), respectively. 29,30 DE ð%Þ ¼…”