検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年
検索結果: 11 件中 1件目~11件目を表示
  • 1

発表形式

Initialising ...

選択項目を絞り込む

掲載資料名

Initialising ...

発表会議名

Initialising ...

筆頭著者名

Initialising ...

キーワード

Initialising ...

使用言語

Initialising ...

発行年

Initialising ...

開催年

Initialising ...

選択した検索結果をダウンロード

論文

Insights into machine-learning modeling for Cr(VI) removal from contaminated water using nano-nickel hydroxide

Maamoun, I.; Rushdi, M.*; Falyouna, O.*; Eljamal, R.*; Eljamal, O.*

Separation and Purification Technology, 308, p.122863_1 - 122863_16, 2023/03

 被引用回数:2 パーセンタイル:37.55(Engineering, Chemical)

The aim of this study is to employ machine learning (ML) in providing high-accuracy prediction of Cr(VI) removal efficiency by nickel hydroxide ($$n$$-Ni(OH)$$_{2}$$) unconventional sorbent, towards the new era of artificial intelligence (AI) applications in (waste) water treatment. Hence, a reliable ML modeling was conducted based on the experimental investigation, considering different reaction parameters, including $$n$$-Ni(OH)$$_{2}$$ dosage, initial pH, reaction temperature, and initial Cr(VI) concentration. Linear regression model was selected as the suitable regression model with respect to the obtained reasonable correlation and the less training time and evaluation time, comparing to other considered regression techniques. The adopted linear regression model, for the time corresponding Cr(VI) removal efficiencies, exhibited satisfactory prediction accuracy. Furthermore, the importance of models coefficients was determined and implied the high importance of the dosage feature. The contributive effect of the investigated features was mainly concentrated at the early stage of the reaction (5 to 10 min), with an average range of 50 to 80 %, which was in agreement with the experimental findings of the rapid and full removal of Cr(VI) by $$n$$-Ni(OH)$$_{2}$$. The elucidated insights into the effects of different factors that influence Cr(VI) removal process by $$n$$-Ni(OH)$$_{2}$$ revealed the underlying interactions and removal pathways, which shall benefit other researchers in the preliminary design of pilot-scale applications and anticipating the predicted performance.

論文

Bench-scale injection of magnesium hydroxide encapsulated iron nanoparticles (nFe$$^{0}$$@Mg(OH)$$_{2}$$) into porous media for Cr(VI) removal from groundwater

Maamoun, 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:11 パーセンタイル:86.43(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$$^{0}$$@Mg(OH)$$_{2}$$) 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$$^{0}$$ and nFe$$^{0}$$@Mg(OH)$$_{2}$$ into porous media. The results indicated the expected poor mobility of nFe$$^{0}$$, 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$$^{0}$$@Mg(OH)$$_{2}$$ 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$$^{0}$$. The injected nFe$$^{0}$$@Mg(OH)$$_{2}$$ maintained the full Cr(VI) removal efficiency for 30 post-injection cycles. Such a promising potential of the nFe$$^{0}$$@Mg(OH)$$_{2}$$, 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.

論文

Statistical optimization of nZVI chemical synthesis approach towards P and NO$$_{3}$$$$^{-}$$ removal from aqueous solutions; Cost-effectiveness & parametric effects

Maamoun, I.; Eljamal, R.*; Eljamal, O.*

Chemosphere, 312, Part 1, p.137176_1 - 137176_11, 2023/01

 被引用回数:3 パーセンタイル:45.99(Environmental Sciences)

This study aims to conduct statistical optimization of nZVI synthesis parameters towards the removal efficiency of phosphorus and nitrate, considering for the first time the cost-effectiveness index. The detailed statistical analysis was implemented to evaluate the main effects and interactions of eight synthesis parameters, including reductant concentration (R$$_{rm C}$$), reductant delivery rate (R$$_{rm DR}$$), reductant liquid volume (R$$_{rm LV}$$), pH, aging time (AG$$_{rm T}$$), mixing speed (M$$_{rm S}$$), temperature (T), and precursor concentration (P$$_{rm C}$$). Results revealed that the experimental optimization of the synthesis factors improved the removal efficiency of nitrate and phosphorus by 27 and 9%, respectively, with respect to that before the optimization. ANOVA statistical results indicated the significance of phosphorus and nitrate models with p-values of all the eight main linear effects were less than 0.05. However, most of the interaction parameters were not statistically significant (higher than 0.05) in the case of nitrate model, which is unlike phosphorus model where all interaction parameters were statistically significant (less than 0.05). The normal probability plots of factors effects provided significant evidence of the significance of the investigated parameters R$$_{rm C}$$ had the highest positive statistically significant effect on phosphorus model followed by R$$_{rm LV}$$, R$$_{rm DR}$$, M$$_{rm S}$$ and T. In case of nitrate model, R$$_{rm LV}$$, had the highest positive significant effect, followed by A$$_{rm GT}$$ $$>$$ $$_{rm DR}$$ $$>$$ pH $$>$$ T $$>$$ MS. The cost-effective optimal constraints in this study resulted in the best economically optimized values of the nZVI synthesis parameters in terms of higher reactivity and reduced synthesis cost.

論文

Sustainable technologies for the removal of Chloramphenicol from pharmaceutical industries Effluent; A Critical review

Falyouna, O.*; Maamoun, I.; Ghosh, S.*; Malloum, A.*; Othmani, A.*; Eljamal, O.*; Amen, T. W. M.*; Oroke, A.*; Bornman, C.*; Ahmadi, S.*; et al.

Journal of Molecular Liquids, 368, Part B, p.120726_1 - 120726_25, 2022/12

 被引用回数:2 パーセンタイル:23.08(Chemistry, Physical)

Despite the carcinogenic and other adverse health effects ofchloramphenicol (CAP), it is frequently detected in different water sources (e.g., groundwater, surface water, wastewater effluents, etc.) due to ongoing, illegal, and abusive application of CAP in veterinary medicine. Although extensive research has been carried out to develop effective treatment technologies to remove the persistent CAP from aqueous mediums, yet there is no critical review of these studies to the best of our reach This review will be the first in the literature to comprehensively summarize the state-of-the-art treatment techniques for CAP removal from water. We report the removal of CAP by adsorption, biodegradation, nanoscale zerovalent iron technology (nZVI), and advanced oxidation processes (AOPs). The result shows that carbon-based adsorbents have more q$$_{rm max}$$ equal 892.86 mg/g for Porous carbon material from $$Enteromorpha prolifera$$. The Langmuir- Freundlich isotherm and pseudo-second order kinetics model were reported to best describe the isotherm and kinetic model respectively. Removing the CAP via biodegradation would achieve the advantages of low operating costs, and environmental friendliness. The process of AOPs among the various treatment options can be a promising method for CAP degradation in water. This review comprehensively summarizes the state-of-the-art treatment techniques for CAP removal from water. Particularly, serving as an inclusive reference for future researchers to easily define the research gabs in the literature and plan for their future work in developing novel treatment methods to decontaminate CA-contaminated waters.

論文

Chloramphenicol removal from water by various precursors to enhance graphene oxide-iron nanocomposites

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:7 パーセンタイル:93.47(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.

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

Insights into boron removal from water using Mg-Al-LDH; Reaction parameters optimization & 3D-RSM modeling

Eljamal, O.*; Maamoun, I.; Alkhudhayri, S.*; Eljamal, R.*; Falyouna, O.*; 田中 万也; 香西 直文; 杉原 裕司*

Journal of Water Process Engineering (Internet), 46, p.102608_1 - 102608_13, 2022/04

 被引用回数:13 パーセンタイル:98.57(Engineering, Environmental)

In this study, calcined Mg-Al layered double hydroxide was successfully synthesized for boron removal from aqueous solutions. Batch experiments were conducted considering various reaction conditions, including initial pH, reaction temperature, initial boron concentration, Mg-Al-CLDH dosage, ambient condition, and co-existing ions effect, for optimizing boron removal efficiency. Results showed that sorption kinetic rate became higher by approaching towards the neutral pH conditions, while it declined at the strong acidic or alkaline conditions. Mg-Al-CLDH was capable of removing high boron concentration from aqueous solutions at a reasonable dosage, with a comparable sorption capacity to the other reported studies. Moreover, high boron removal rates were observed at high reaction temperatures, reflecting the endothermic nature of the reaction, and reached equilibrium within less than 6 h. Moreover, results of 3D-RSM modeling confirmed that the middle-high range of Mg-Al-CLDH dosage values was the suitable range to achieve high boron removal efficiency, in spite of pH, temperature, and initial concentration effects. Furthermore, isotherm modeling confirmed that boron removal by Mg-Al-CLDH occurred via a mono-layer sorption, and thermodynamic modeling revealed the positive value of entropy change, indicating that the randomness of the solid/liquid interaction increased within the adsorption process of boron. Spent Mg-Al-CLDH showed great reusability performance by considerable boron removal efficiency over three consecutive regeneration cycles, confirming the high potential and applicability of the presented adsorbent in real water treatment applications.

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

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.

11 件中 1件目~11件目を表示
  • 1