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@Mg(OH)
) into porous media for Cr(VI) removal from groundwaterMaamoun, I.; Falyouna, O.*; Eljamal, R.*; Idham, M. F.*; 田中 万也; Eljamal, O.*
Chemical Engineering Journal, 451, Part3, p.138718_1 - 138718_22, 2023/01
被引用回数：43 パーセンタイル：93.26(Engineering, Environmental)Chromium (VI) contamination in groundwater represents a significant threat to the current and future groundwater resources. Thus, in this work detailed investigation was conducted on the injection of magnesium hydroxide encapsulated iron nanoparticles (nFe@Mg(OH)) into a 3-D bench-scale groundwater treatment system for Cr(VI) removal. Cr(VI) and total iron concentration profiles were determined for the injection of both nFe and nFe@Mg(OH) into porous media. The results indicated the expected poor mobility of nFe, which caused the accumulation of the injected mass within the injection zone and the low spreading range along the length of the aquifer. The injection of nFe@Mg(OH) into the groundwater treatment system for 80 consecutive cycles resulted in a clear enhancement in preventing the rapid corrosion of the iron core and around twenty percent improvement in the final Cr(VI) removal efficiency compared with that of nFe. The injected nFe@Mg(OH) maintained the full Cr(VI) removal efficiency for 30 post-injection cycles. Such a promising potential of the nFe@Mg(OH), proposed it as one of the perfect candidates for in-situ water treatment applications, as a reactive nanomaterial with enhanced features, in terms of the prolonged reactive performance and the widespread of the injection zone to cover a larger contaminated area within the porous media.
Idham, M. F.*; Falyouna, O.*; Eljamal, R.*; Maamoun, I.; Eljamal, O.*
Journal of Water Process Engineering (Internet), 50, p.103289_1 - 103289_16, 2022/12
被引用回数：32 パーセンタイル：94.76(Engineering, Environmental)Due to synthesis variation affecting various graphene oxide (GO) physicochemical parameters and cost efficiency aspects, the present study investigated the influence of GO precursor components for GO precipitated nZVI nanocomposite (nZVI/GO) and optimized removal conditions to remove chloramphenicol (CAP) from water. In order to synthesize nZVI/GO nanocomposites, four methods of GO precursor synthesis were used, denoted GO1, GO2, GO3, and GO4. A novel synthesis process is introduced based on economic and time-less-consuming protocols to produce GO precursor. A series of desorption experiments were also implemented in various eluents to clarify the CAP removal mechanism. Interestingly, this study demonstrated the substantial impact of GO precursor on the nanocomposite performance in eliminating CAP. The introduced novel GO successfully served as an excellent nZVI precipitation medium and enhanced CAP removal efficiency. Empirical optimization demonstrated that nZVI/GO4-1:1 could eliminate up to 91% of 100 mg/L CAP by dosage as low as 0.25 g/L at pH 5. nZVI/GO4 displayed CAP removal stability throughout a more comprehensive pH range, and remarkable recyclability, making it more promising and practical than bare nZVI and other analyzed nanocomposites. Kinetics data demonstrated a high degree of compatibility with the pseudo-first-order (PFO) and pseudo-second-order (PSO). Through kinetics and statistical analyses, desorption experiments, FTIR spectroscopy, and EDX analysis, nZVI/GO4 removed some of the CAP through the adsorption mechanism controlled by physisorption and chemisorption. In contrast, the oxidation mechanism eliminated the remaining CAP.
Falyouna, O.*; Idham, M. F.*; Maamoun, I.; Bensaida, K.*; Ashik, U. P. M.*; 杉原 裕司*; Eljamal, O.*
Journal of Molecular Liquids, 359, p.119323_1 - 119323_20, 2022/08
被引用回数：48 パーセンタイル：98.98(Chemistry, Physical)Water contamination by ciprofloxacin (CIP) is a global and emerging issue because it increases the risk of infection by antimicrobial resistant bacteria. CIP removal from water by iron nanoparticles (Fe) with the presence of oxalate hasn't been reported yet. The present study demonstrated that the addition of oxalate to Fe nanoparticles improved the removal of CIP under the following optimum conditions: dose = 0.3 g L
, oxalate = 0.3 mM, initial pH = 7, and temperature = 25 
C. Furthermore, the experimental results illustrated that high concentrations of dissolved oxygen in the aqueous solution greatly decreased the removal efficiency of CIP by Fe oxalate system. In addition, the desorption experiments and the results of SEM-EDS, XRD, and FTIR revealed that physisorption and chemisorption were responsible for CIP removal by Fe oxalate system as the addition of 0.3 mM of oxalate boosted the surface complexation between Fe nanoparticles and the carboxylic, ketone, and piperazinyl groups in CIP. These results were supported by the outcomes of kinetics, isotherm, and thermodynamic analysis. Finally, this study proved that Fe oxalate system is inexpensive, practical, and more efficient than most of the reported Fe-based systems with a maximum adsorption capacity of 294.66 mg g.
