Adsorption of Methylene Blue on A Polymeric Matrix of Poly Lactic Acid/Sodium Alginate/Carbon Nanoparticles (PLA/SA/CNP)

Abstract

This study presents the preparation of Poly lactic acid/Sodium alginate (PLA/SA) and PLA/SA/CNP beads for the methylene blue (MB) adsorption. A Fourier transform infrared spectrometer (FTIR) characterized the produced adsorbent. The various dosages of CNP content were added to PLA/SA beads. The percentage of adsorbed dye increased with increasing CNP content, so the optimum percentage is 5%wt. The beads' adsorption capacity and removal efficiency was investigated as a function of (adsorbent dosage, contact time, initial pH, and concentration of adsorbate). The highest rate of the adsorptive removal process for MB dye was found at pH 9 after 120 min equilibration time with 50mg of PLA/SA/CNP beads. Langmuir and Freundlich's models were applied for the illustration of experimental data. Langmuir models illustrate that the maximum adsorption capacity equals 304.88mg/g.

Reduced Graphene Oxide-Zinc Sulfide Nanocomposite Decorated with Silver Nanoparticles for Wastewater Treatment by Adsorption, Photocatalysis and Antimicrobial Action

“…FT-IR analysis of the rGO-ZnS-Ag, rGO-ZnS, and rGO in Figure 4 a–c, respectively, display some characteristic peaks of the graphene oxide, i.e., 1727 cm −1 for the C=O stretching vibration of the carboxyl moiety and 1218 cm −1 for the C-OH stretching [ 30 , 31 ]. The peaks corresponding to the oxygen functionalities of GO, such as carbonyl, hydroxyl, carboxyl, and epoxy groups, disappeared completely upon reduction, whereas some other peaks underwent a substantial shift from 1048 cm −1 to 1005 cm −1 for the C-O stretching vibration due to the strong reduction of the graphene oxide by the N, N Dimethyl formamide, indicating the good reduction ability of the solvent [ 22 ]. Thus, DMF not only acts as a medium for nanocomposite formation, but also a reducing agent for both nanoparticles and for GO sheets.…”

“…A large number of semiconducting nanomaterials, such as WO 3 , ZnO, TiO 2 , and Fe 3 O 4 , were utilized as photocatalysts previously [ 19 ]. Apart from these conventional photocatalysts, ZnS has gained popularity as an efficient photocatalyst due to its low cost, non-toxicity, abundance, and photostability [ 20 , 21 , 22 ]. However, there are still some concerns that need to be resolved for its use on an industrial scale, such as a higher band gap and its agglomerating tendency during the synthesis process, along with its difficult removal from the reaction medium [ 22 , 23 , 24 ].…”

“…Apart from these conventional photocatalysts, ZnS has gained popularity as an efficient photocatalyst due to its low cost, non-toxicity, abundance, and photostability [ 20 , 21 , 22 ]. However, there are still some concerns that need to be resolved for its use on an industrial scale, such as a higher band gap and its agglomerating tendency during the synthesis process, along with its difficult removal from the reaction medium [ 22 , 23 , 24 ]. Although many materials and methods, as mentioned above, have been designed and established for the treatment of contaminated water, they can be used for the treatment of one type of pollutant by either adsorption, catalysis, or antimicrobial action.…”