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Removal of lead(Pb(Ⅱ))and zinc(Zn(Ⅱ))from aqueous solution using coal fly ash(CFA)as a dual-sites adsorbent

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Chinese Journal of Chemical Engineering 2021年第6期34卷 289-298页

作者： Widi Astuti Achmad Chafidz Ahmed S.Al-Fatesh anis H.fakeeha Chemical Engineering Department Universitas Negeri SemarangSemarang 50229Indonesia Chemical Engineering Department Universitas Islam IndonesiaYogyakarta 55584Indonesia Center for Material Science and Technology Studies Chemical Engineering DepartmentUniversitas Islam IndonesiaYogyakarta 55584Indonesia Chemical Engineering Department King Saud UniversityRiyadh 11421Saudi Arabia

Coal fly ash(CFA)is composed of minerals containing some oxides in crystalline phase(i.e.,quartz and mullite),as well as unburned carbon as mesoporous material,thus enabling CFA to act as a dual-sites adsorbent with unique *** work focused on the adsorption of Pb(Ⅱ)and Zn(Ⅱ)from binary system,a mixture containing two metal ion solutions present simultaneously,onto NaOH-modified CFA(MCFA).Several adsorption tests were conducted to evaluate the effect of several parameters,including pH and contact *** experiment results indicated that chemical treatment of CFA with NaOH increased pore volume from 0.021 to 0.223 cm^3·g^(-1).In addition,it could also enhance the availability of functional groups on both minerals and unburned carbon,resulting in almost 100%Pb(Ⅱ)and 97%Zn(Ⅱ)*** optimum pH for adsorption system was pH=3 and quasi-equilibrium occurred in 240 *** data from the experimental results were analyzed using Modified Extended Langmuir(MEL)and Competitive Adsorption Langmuir-Langmuir(CALL)isotherm *** analysis results showed that the CALL isotherm model could better describe the Pb(Ⅱ)and Zn(Ⅱ)adsorption process onto MCFA in binary system compared with MEL isotherm model.

关键词： Modified coal fly ash Adsorption Dual-sites adsorbent Pb(Ⅱ) Zn(Ⅱ) Aqueous solution

Bi-metallic catalysts of mesoporous Al_2O_3 supported on Fe, Ni and Mn for methane decomposition: Effect of activation temperature

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Chinese Journal of Chemical Engineering 2018年第9期26卷 1904-1911页

作者： anis H.fakeeha Ahmed S.Al-Fatesh Biswajit Chowdhury Ahmed A.Ibrahim Wasim U.Khan Shahid Hassan Kasim Sasudeen Ahmed Elhag Abasaeed Chemical Engineering Department College of Engineering King Saud University Department of Applied Chemistry Indian School of Mines

Methane decomposition reaction has been studied at three different activation temperatures（500℃,800℃ and950℃）over mesoporous alumina supported Ni–Fe and Mn–Fe based bimetallic *** co-impregnation of Ni on Fe/Al2O3the activity of the catalyst was retained even at the high activation temperature at 950℃ and up to180 *** Ni promotion enhanced the reducibility of Fe/Al2O3oxides showing higher catalytic activity with a hydrogen yield of 69%.The reactivity of bimetallic Mn and Fe over Al2O3catalyst decreased at 800℃ and 950℃ activation *** studies revealed that the catalyst could be effectively recycled up to *** addition of O2（1 ml,2 ml,4 ml）in the feed enhanced substantially CH4conversion,the yield of hydrogen and the stability of the catalyst.

关键词： Carbon nanotube Hydrogen production Methane decomposition Manganese promoter Nickel promoter

助剂对甲烷干重整 Ni/γ-Al_2O_3催化剂性能的影响(英文)

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催化学报 2011年第10期32卷 1604-1609页

作者： Ahmed S.A.AL-FATESH anis H.fakeeha Ahmed E.ABASAEED Chemical Engineering Department College of EngineeringKing Saud UniversityP.O.Box 800Riyadh 1142Saudi Arabia

The Ni catalysts supported on γ-Al2O3 were synthesized by an impregnation *** catalytic performance in methane dry reforming was *** reforming reactions were carried out in a microreactor using a CO2:CH4 feed ratio of 1:1,a F/W = 2640 ml/(h·g),reaction temperatures between 500-850 ?C,and at atmospheric *** influence of Ca,Ce,and Zr promoters on catalyst stability,coke deposition,and the H2/CO ratio were also *** were analyzed using an online gas chromatograph equipped with a thermal conductivity *** spent and fresh catalysts were characterized by scanning electron microscopy and thermogravimetric *** was found that 3%Ni/γ-Al2O3 promoted with 0.15% Ce and 0.05% Ca gave the best performance and resulted in less coke *** highest CH4 and CO2 conversion activities were found to be 94.1% and 98.3% at 850 ?C,*** tests were carried out for 130 h and this provided a H2 yield of 91%.Moreover,the amount of formed carbon was negligible and did not increase to more than 1.5 wt%.

关键词：稳定性合成气焦碳合成方法

A Reframed Watermark Extraction Approach Using the ABC Algorithm

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Chinese Journal of Electronics 2021年第4期30卷 736-742页

作者： KRICHA anis KRICHA Zied SAKLY anis LATIS Lab National School of Engineers of Sousse University of Sousse National School of Engineers of Monastir University of Monastir Higher Institute of Applied Science and Technology of Sousse University of Sousse ESIR Research Unit National School of Engineers of Monastir University of Monastir

The fast development and the rapid spread of information technology have raised the issue of digitalimage copyright protection, which was mostly addressed through robust watermarking. To ensure the survival of the watermark after attacks, most works have been making use of an additional step at the embedding phase,and by so making the scheme unsuitable for real-time implementation. However, to be effective and secure, it is recommended to combine the watermarking algorithm and the capture sensor in one device. In this paper, we brought the extra stage to the detection side. We firstly studied the effect of some signal processing operations on a watermarked image, then we proposed a general model for watermark extraction whose parameters were determined using the artificial bee colony. The efficacy of the proposed method was validated by comparing its robustness with two state-of-art schemes focusing on the watermark extraction.

关键词： Robust watermarking Artificial bee colony(ABC) Adaptive extraction

沸石负载Ni催化剂在甲烷干重整中的稳定性(英文)

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催化学报 2013年第4期34卷 764-768页

作者： anis H. fakeeha Wasim U. KHAN Ahmed S. AL‐FATESH Ahmed E. ABASAEED Chemical Engineering Department College of Engineering King Saud University

Ni/γ-Al2O3 , Ni/Y-zeolite, and Ni/H-ZSM-5 catalysts were prepared using the incipient wetness impregnation method. Their catalytic performance in dry reforming of methane was studied. The fresh and used catalysts and deposited carbon were characterized using H2 temperature-programmed reduction, temperature-programmed oxidation, N2 adsorption-desorption, X-ray diffraction, and thermogravimetric analysis. The H-ZSM-5-supported Ni catalyst proved to be more stable than the other two catalysts, as it had the lowest carbon deposition.

关键词： Carbon dioxide Dry reforming Methane Nickel catalyst H‐ZSM‐5 zeolite Carbon deposition

Discrete-Time Chaotic Systems Synchronization Based on Vector Norms Approach

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Journal of Systems Science & Complexity 2017年第5期30卷 1012-1026页

作者： GAM Rihab SAKLY anis Industrial Systems Study and Renewable Energy(ESIER) the National Engineering School of Monastir(ENIM)University of Monastirav.Ibn El jazzar Skanes 5019Tunisia

Suitable stabilization conditions obtained for continuous chaotic systems are generalized to discrete-time chaotic systems. The proposed approach, leading to these conditions for complete synchronization is based on the use of state feedback and aggregation techniques for stability studies associated with the arrow form matrix for system description. The results are successfully applied for two identical discrete-time hyper chaotic Henon maps with different orders and also for non-identical discrete-time chaotic systems with same order namely the Lozi and the Ushio maps.

关键词： Aggregation techniques arrow form matrix different order discrete-time chaotic systems synchronization.

Role of La_2_O3 as Promoter and Support in Ni/γ-Al_2O_3 Catalysts for Dry Reforming of Methane

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Chinese Journal of Chemical Engineering 2014年第1期22卷 28-37页

作者： Ahmed S.Al-Fatesh Muhammad A.Naeem anis H.fakeeha Ahmed E.Abasaeed Chemical Engineering Department College of Engineering King Saud University

The nature of support and type of active metal affect catalytic performance. In this work, the effect of using La203 as promoter and support for Ni/γ-A1203 catalysts in dry reforming of methane was investigated. The reforming reactions were carried out at atmosphenc pressure in the temperature range of 500-2700℃. The activity and stability of the catalyst, carbon formation, and syngas （H2/CO） ratio were determined. Various techniques were applied for characterization of both fresh and used catalysts. Addition of La2O3 to the catalyst matrix improved the dispersion of Ni and adsorption of CO2, thus its activity and stability enhanced.

关键词： CO2 methane reforming.Ni/γ-A12O3 La2O3 carbon deposition H2/CO

On the Stability Analysis of Switched Nonlinear Systems with Time Varying Delay Under Arbitrary Switching

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Journal of Systems Science & Complexity 2017年第2期30卷 329-346页

作者： KERMANI Marwen SAKLY anis Research Unit of Industrial Systems Study and Renewable Energy(ESIER) National Engineering School of MonastirIbn El JazzarSkaness5019University of MonastirTunisia

This paper addresses the stability problem for a class of switched nonlinear time varying delay systems modeled by delay differential equations. By transforming the system representation under the arrow form and using a new constructed Lyapunov function,the aggregation techniques,the Borne-Gentina practical stability criterion associated with the properties, new delay-independent stability conditions of the considered systems are established. Compared with the existing results in this area, the obtained result is explicit, simple to use and allows us to avoid the problem of searching a common Lyapunov function. Finally, an example is provided, with numerical simulations,to demonstrate the effectiveness of the proposed method.

关键词： Arbitrary switching arrow form statepunov function continuous-time switched nonlinearstability.matrix Borne-Gentina criterion common Lya-time varying delay systems global asymptotic

Performance evaluation of hybrid constructed wetlands for the treatment of municipal wastewater in developing countries

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Chinese Journal of Chemical Engineering 2020年第6期28卷 1717-1724页

作者： Sajjad Haydar Mehwish anis Misbah Afaq Institute of Environmental Engineering&Research(IEER) University of Engineering&Technology(UET)LahorePakistan

In developing countries,high cost of conventional wastewater treatment is a major hindrance in its *** wetlands(CWs)offer low-cost and effective solution to this *** current study aimed to evaluate an innovative maneuver of CWs *** flow constructed wetlands(HCWs)for municipal wastewater(MWW).The HCWs included two lab scale CWs;one horizontal and one vertical,in *** plant species were *** were operated in both,batch and continuous *** mode was used to(1)optimize detention time and(2)find pollutants removal *** operation(at batch optimized retention time)was carried out for the evaluation of mass removal rate,r(g·m-2·d-1),volumetric rate constant,Kv(per day)and areal rate constant,Ka(m·d-1).Among two local plants tested,Pistia stratiotes gave better removal efficiency than *** detention time in HCWs was found to be 8 days(4+4 each).The optimum COD,BOD,TSS,TKN and P removal observed for Pistia stratiotes planted HCWs was 80%,84%,82%,71%and88%*** standards for COD,BOD and TSS were met at optimum *** values of Kaand Kv demonstrated that more removal occurred in vertical flow as compared to horizontal flow CW.

关键词： Constructed wetlands Municipal wastewater Hybrid Pistia Typha Batch mode Continuous mode