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論文

Promotion of ciprofloxacin adsorption from contaminated solutions by oxalate modified nanoscale zerovalent iron particles

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:14 パーセンタイル:99.4(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$$^{0}$$) with the presence of oxalate hasn't been reported yet. The present study demonstrated that the addition of oxalate to Fe$$^{0}$$ nanoparticles improved the removal of CIP under the following optimum conditions: dose = 0.3 g L$$^{-1}$$, oxalate = 0.3 mM, initial pH = 7, and temperature = 25 $$^{circ}$$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$$^{0}$$ 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$$^{0}$$ oxalate system as the addition of 0.3 mM of oxalate boosted the surface complexation between Fe$$^{0}$$ 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$$^{0}$$ oxalate system is inexpensive, practical, and more efficient than most of the reported Fe$$^{0}$$-based systems with a maximum adsorption capacity of 294.66 mg g$$^{-1}$$.

論文

Rapid and efficient chromium (VI) removal from aqueous solutions using nickel hydroxide nanoplates (nNiHs)

Maamoun, I.; Bensaida, K.*; Eljamal, R.*; Falyouna, O.*; 田中 万也; Tosco, T.*; 杉原 裕司*; Eljamal, O.*

Journal of Molecular Liquids, 358, p.119216_1 - 119216_13, 2022/07

 被引用回数:10 パーセンタイル:98.48(Chemistry, Physical)

In this study, nickel hydroxide nanoplates (nNiHs) were developed to achieve rapid and significant Cr(VI) removal from aqueous solutions. nNiHs showed an average particle size and crystallite size of 36.8 nm and 8.68 nm, respectively. Different reaction parameters were investigated, including nNiHs dosage, pH, reaction temperature, initial Cr(VI) concentration, and co-existing anions. nNiHs could efficiently remove 20 mg/L Cr(VI) concentration over a wide pH and temperature range(s). Pseudo 2nd order kinetic model and Freundlich isotherm model were the best to fit experimental data. A maximum Cr(VI) sorption capacity of 71.25 mg/g was achieved at the optimal reaction conditions, comparable to the previously reported values. The governing Cr(VI) removal mechanism by nNiHs involved the high dominance of electrostatic adsorption and the low dominance of co-precipitation. The high sorption potential of the nNiHs and the high affinity of the aqueous Cr(VI) species, enabled the proposed adsorbent to yield an efficient performance in binary environmental systems.

論文

Multi-functional magnesium hydroxide coating for iron nanoparticles towards prolonged reactivity in Cr(VI) removal from aqueous solutions

Maamoun, I.; Falyouna, O.*; Eljamal, R.*; Bensaida, K.*; 田中 万也; Tosco, T.*; 杉原 裕司*; Eljamal, O.*

Journal of Environmental Chemical Engineering, 10(3), p.107431_1 - 107431_17, 2022/06

 被引用回数:23 パーセンタイル:98.05(Engineering, Environmental)

In this study, the reactive performance of magnesium hydroxide-coated iron nanoparticles was investigated for the removal of hexavalent chromium from aqueous solutions. Short- and long-term progressive-release of reactivity was evaluated through several batch tests. The Multi-functional effect of the environmentally-friendly magnesium hydroxide coating shell was represented by the progressive shell-dissolution in water and preventing the rapid corrosion of the iron core, which resulted in a controlled release of reactivity towards hexavalent chromium. Magnesium hydroxide-coated iron nanoparticles showed good performance in preserving the long-term reactivity within a wide ranges of pH and temperature. The long-term investigation of magnesium hydroxide-coated iron nanoparticles performance towards hexavalent chromium removal confirmed the progressive and maintained reactivity, represented by the continuous release of iron core electrons, to achieve full removal over 50 days reaction time, to be reported for the first time in the literature. The material showed high regeneration abilities up to 5 cycles with 1.36 times average enhancement in hexavalent chromium removal efficiency compared to that of iron. Moreover, it achieved an increase in the shelf-live longevity performance up to 30 days without any storing solution with considerable removal efficiency after 180 min reaction time.

論文

A Novel method to improve methane generation from waste sludge using iron nanoparticles coated with magnesium hydroxide

Eljamal, R.*; Maamoun, I.; Bensaida, K.*; Yilmaz, G.*; 杉原 裕司*; Eljamal, O.*

Renewable and Sustainable Energy Reviews, 158, p.112192_1 - 112192_13, 2022/04

 被引用回数:16 パーセンタイル:96.29(Green & Sustainable Science & Technology)

In response to the low efficiency of the anaerobic digestion (AD) process in generating methane gas, we apply for the first time the use of coated/ Fe$$^{0}$$ with Mg(OH)$$_{2}$$ to enhance the production rate of methane gas from the degradation of waste sludge. A series of batch tests investigated several operations factors followed by a semi-continuous operation system examined the long-term production of methane gas in the presence of the coated/ Fe$$^{0}$$ were performed. The coating ratio of Mg(OH)$$_{2}$$/Fe$$^{0}$$ and the dosage of coated/Fe$$^{0}$$ were optimized to acquire the highest production rate of methane as 0.5% and 25 mg/gVS, respectively. Under these optimum conditions, the methane production increased by 46.6% in the batch tests and 120% in the semi-continuous operation system compared to the control reactor. The results revealed that both Fe$$^{0}$$ and Mg(OH)$$_{2}$$ did not significantly improve the production of methane when each one was used alone at different dosages, and the improved methane production originated from the synergetic effect of combining these two materials. The crucial role of Mg(OH)$$_{2}$$ coating layer was associated with the controlled reactivity release of Fe$$^{0}$$, which was indicated by the slow release of ferrous and ferric ions in the bioreactors. Furthermore, the addition of coated/Fe$$^{0}$$ stimulated bacterial growth, increased methane content, and maintained the pH within the optimum range in the bioreactors. The dosing time of coated/Fe$$^{0}$$ was investigated during the four stages of AD process, and the best dosing time was found in the methanogenic stage (on Day 4). Overall, based on the experimental and predicted methane production, the coated/Fe$$^{0}$$ has a great potential for the practical applications of AD.

論文

Synthesis of hybrid magnesium hydroxide/magnesium oxide nanorods [Mg(OH)$$_{2}$$/MgO] for prompt and efficient adsorption of ciprofloxacin from aqueous solutions

Falyouna, O.*; Bensaida, K.*; Maamoun, I.; Ashik, U. P. M.*; 田原 淳士*; 田中 万也; 青柳 登; 杉原 裕司*; Eljamal, O.*

Journal of Cleaner Production, 342, p.130949_1 - 130949_15, 2022/03

 被引用回数:20 パーセンタイル:98.9(Green & Sustainable Science & Technology)

The antibiotic ciprofloxacin is recognized as a contaminant of emerging concern because its persistent occurrence in water accelerates the growth of deadly antimicrobial resistance genes. For the first time, the conventional precipitation technique was thermally modified to produce hybrid magnesium hydroxide/magnesium oxide nanorods for efficient and rapid adsorption of CIP from water. The successful synthesis was confirmed by the outcomes of TEM, EDS, XRD, and FTIR analysis. Mg(OH)$$_{2}$$/MgO exhibited an extraordinary capability to adsorb CIP from water regardless of CIP initial concentration under neutral pH and room temperature. FTIR analysis for the spent Mg(OH)$$_{2}$$/MgO revealed that bridging complexation with carboxylic group and electrostatic attraction with the positive amine group are the responsible mechanisms for CIP adsorption by Mg(OH)$$_{2}$$/MgO. Moreover, simulated CIP-contaminated river water was efficiently treated by Mg (OH)$$_{2}$$/MgO which proves the promising performance of Mg(OH)$$_{2}$$/MgO in field scale applications.

論文

New insight for electricity amplification in microbial fuel cells (MFCs) applying magnesium hydroxide coated iron nanoparticles

Bensaida, K.*; Maamoun, I.; Eljamal, R.*; Falyouna, O.*; 杉原 裕司*; Eljamal, O.*

Energy Conversion and Management, 249, p.114877_1 - 114877_12, 2021/12

 被引用回数:23 パーセンタイル:96.13(Thermodynamics)

Microbial fuel cells (MFC) are a versatile technology for power generation from biodegradable solid wastes. This study examines the addition of bare and coated Fe0 nanoparticles to the anolyte of a lab-scale MFC for the first time. Four different coating ratios (0.1, 0.2, 0.5, and 1.0) were separately added and comparatively evaluated for power generation. The study examined the use of four different waste sludge substrates, different pH, and aerobic enriched cathode chambers effect on wastewater treatment and current production. Results showed that coating ratio of 0.2 was promising to achieve 4 times increase in the voltage compared to the control and provide the maximal power density. The current generation stability was achieved under neutral pH, and the power density output is maintained high under anaerobic conditions. The addition of the coated Fe0 nanoparticles is an effective method to enhance electricity generation and sludge digestion. However, additional parameters should be considered.

口頭

Enhanced arsenic removal from aqueous solutions via magnesium hydroxide coated iron nanoparticles

Maamoun, I.; Falyouna, O.*; Shariful, I. M.*; Eljamal, R.*; Bensaida, K.*; 田中 万也; 徳永 紘平; Eljamal, O.*

no journal, , 

The main aim of this study is to investigate the potential of Mg(OH)$$_{2}$$ coated iron nanoparticles in achieving improved arsenic removal from aqueous solutions. Set of batch tests has been conducted to understand the effect of several reaction factors, including coating ratio optimization, dosage, initial pH, temperature, and initial As(V) concentration. Results indicated that full coating was the optimal Mg(OH)$$_{2}$$ coating ratio which yielded full removal efficiency after 120 min reaction time, higher than that of nFe0 and Mg(OH)$$_{2}$$coated iron nanoparticles with lower coating ratios. Furthermore, both strong acidic and high temperature conditions were favorable for inducing the arsenic removal performance of Mg(OH)$$_{2}$$ coated iron nanoparticles. Still, Mg(OH)$$_{2}$$ coated iron nanoparticles could efficiently achieve comparable removal at a wide pH and temperature ranges. Such results implied the contribution of Mg(OH)$$_{2}$$ to As(V) removal via adsorption and the possible co-precipitation of As(III) with the released Mg$$^{2+}$$ from the coating shell dissolution. Besides, the progressive release of electrons from the iron core contributed to As(V) reduction to As(III). In conclusion, the proposed Mg(OH)$$_{2}$$ coated iron nanoparticles could be a perfect nanomaterial candidate for the real applications of arsenic removal from contaminated waters.

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