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Recent advancements in graphene adsorbents for wastewater treatment:Current status and challenges

Chinese Chemical Letters 2020年第10期31卷 2525-2538页

作者： md.faysal hossain Nasrin Akther Yanbo Zhou State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and TechnologyShanghai 200237China National Engineering Laboratory for Industrial Wastewater Treatment East China University of Science and TechnologyShanghai 200237China

From emerging pollutants to emerged threat,researchers are continuously looking for promising technologies for wastewater *** has been identified as the most convenient approach for treating wastewater at low-cost and with ***,graphene and its derivatives have gained heightened attention as novel adsorbents because of their unique molecular structure and outstanding physicochemical *** metals,dyes,polycyclic aromatic hydrocarbons(PAHs)and other pollutants,which are widely concerned recently,all show different adsorption *** functional groups,resonating and delocalizedπ-electron system of graphene derivatives lead to the formation of various adsorptive interactions i.e.,π-πinteractions,electrostatic interactions,Hbonding,*** these venomous pollutants,and quarantine them in *** pristine form of graphene subsidiaries tends to exhibit low sorption efficiency due to high propensity of agglomeration,lack of selectivity,hydrophobicity and difficulty in phase separation a fter ***,designing of efficient graphene composites through the surface modification with numerous functional groups,polymers or nanoparticles is an ongoing *** graphene composites are increasingly reported,but the fate of pollutants and adsorption mechanisms are still far to be fully *** review summarizes the recent progresses in the application of graphene-based adsorbents for eliminating a wide range of organic and inorganic pollutants from wastewater.A critical explanation is provided on the synthesis of graphene adsorbents,systematic adsorption and desorption mechanisms along with their pollutant removal performances under different experimental conditions.A brief perspective on upcoming research needs and challenges involved in the designing of high-quality graphene-based adsorbents are highlighted.

关键词： Wastewater Adsorption Graphene composites Interaction mechanism Regeneration

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通过纤维素类两性吸附剂提高对水溶液中的阳离子和阴离子染料的去除

通过纤维素类两性吸附剂提高对水溶液中的阳离子和阴离子染料的去...

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作者： md.faysal hossain（费瑟）华东理工大学

学位级别：硕士

随着工业化的不断推进,大量的合成染料被排放到水环境中,这给生态环境带来了严重的威胁,并且也会对人体健康造成严重的危害。吸附技术由于其低成本和效率高在处理印染废水具有一定的优势。而具有特定官能团的天然生物聚合物的绿色吸附... 详细信息

随着工业化的不断推进,大量的合成染料被排放到水环境中,这给生态环境带来了严重的威胁,并且也会对人体健康造成严重的危害。吸附技术由于其低成本和效率高在处理印染废水具有一定的优势。而具有特定官能团的天然生物聚合物的绿色吸附剂已引起人们极大的关注,认为该类吸附剂在处理印染废水具有一定的优势。在本研究中,通过柠檬酸(CA)和聚乙烯亚胺(PEI)改性,制备了含有高密度胺基和羧基的纤维素吸附剂(CS-CA/PEI)。为了验证改性过程,通过SEM、XRD、FT-IR和SEM-EDS对CS-CA/PEI进行了表征。并验证了吸附剂在单一和二元体系中对亚甲基蓝(MB)、维多利亚蓝(VBB)、甲基橙(MO)和日落黄(SSY)吸附效果。由于具有阳离子与阴离子两种基团,CS-CA/PEI表现出两性特性,表明在较宽的pH范围内对阳离子和阴离子染料具有出色的吸附能力。CS-CA/PEI在酸性条件下对阴离子染料(MO与SSY)具有较高的去除率,而在碱性条件下对MB和VBB可有效去除。CS-CA/PEI对MO和SSY表现出较快的吸附速率,并在30分钟内达到吸附平衡。相反,MB和VBB在30分钟内去除率达90%,并在60分钟内达到了平衡。吸附过程最符合伪二级动力学和Langmuir模型。CS-CA/PEI对MB、MO、VBB和SSY的最大吸附容量分别为133.86 mg/g、3789.73 mg/g、124.68 mg/g和214.59 mg/g。然而,CS-CA/PEI在二元污染物系统中表现出比单一系统更高的吸附性能。在二元体系中,MB、MO、VBB和SSY在CS-CA/PEI上的吸附容量分别为188.08 mg/g、238.87 mg/g、236.18 mg/g和210.39 mg/g。与单一系统相比,分别提高了56%、7%、128%和14%。CS-CA/PEI较高的吸附能力表明了其对阳离子和阴离子染料的吸附过程具有协同作用。此外,CS-CA/PEI经过多次吸附-解吸循环后,其具有良好的结构稳定性和可回收性。在连续四个循环后,对CS-CA/PEI进行循环吸附,MB和VBB的吸附效率保持在90%,而MO和SSY保持在70%。因此,具有多个吸附位点的CS-CA/PEI吸附剂在处理印染废水方面具有良好的应用潜力。

关键词：纤维素吸附剂染料二元吸附协同作用可回收性

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Comparative Analysis between Single Diode and Double Diode Model of PV Cell: Concentrate Different Parameters Effect on Its Efficiency

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Journal of Power and Energy Engineering 2016年第3期4卷 31-46页

作者： Tanvir Ahmad Sharmin Sobhan md. faysal Nayan Department of Electrical and Electronic Engineering Ahsanullah University of Science and Technology Dhaka Bangladesh

This research appraises comparative analysis between single diode and double diode model of photovoltaic (PV) solar cells to enhance the conversion efficiency of power engendering PV solar systems. Single diode model is simple and easy to implement, whereas double diode model has better accuracy which acquiesces for more precise forecast of PV systems performance. Exploration is done on the basis of simulation results and MATLAB tool is used to serve this purpose. Simulations are performed by varying distinct model parameters such as solar irradiance, temperature, value of parasitic resistances, ideality factor of diode and number of series and parallel connected solar cells used to assemble PV array. Conspicuous demonstration is executed to analyze effects of these specifications on the efficiency curve and power vs. voltage output characteristics of PV cell for specified models.

关键词： Photovoltaic Cell Single Diode Model Double Diode Model Efficiency Simulation

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Evaluate the Strength of Denim Goods Using Different Washing Technique

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Journal of Materials Science and Chemical Engineering 2021年第3期9卷 1-8页

作者： Jakaria Ahamed md. faysal Mahmud md. faysal Ahammed Rony Mia md. Zahid Hasan Tarequl Hasan Khan Golam Qibria Limon Al Mojnun Shamim Department of Textile Engineering National Institute of Textile Engineering & Research (NITER) Savar Dhaka Bangladesh School of Textile Science & Engineering Wuhan Textile University Wuhan China College of Chemistry & Chemical Engineering Wuhan Textile University Wuhan China

Day by day, the demand and popularity of denim have increased. With the increase in demand for denim, washing has also increased. When we washed a piece of denim fabric, then its properties also changed. The properties are tensile strength, GSM, color fading, stiffness, abrasion resistance, moisture regain, etc. In this study, we conduct different washing processes on denim fabric such are Stonewash, Caustic wash, Acid wash, Normal wash, Pigment wash, Sandblasting, and Super whitewash. After washing, the properties of denim fabric have been analyzed especially strength. The tear and tensile strength were measured by ISO standard. From the above washing method, Normal & pigment wash showed good strength properties comparing with others.

关键词： Denim Fabric Washing Treatment Tear Strength Tensile Strength Normal Wash Pigment Wash

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Feasibility Study of Smart Grid in Bangladesh

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Energy and Power Engineering 2013年第4期5卷 1531-1535页

作者： faysal Nayan md. Aminul Islam Shifat Mahmud Darmstadt University of Applied Science Germany Deoartment of EEE Ahsanullah University of Science and Technology Dhaka Bangladesh Department of EEE Ahsanullah University of Science and Technology Dhaka Bangladesh

The agenda of this paper is to discuss about the significance and a detailed feasibility study of practical implementation of Smart Grid in Bangladesh. Smart grid refers to an electric power system that enhances grid reliability and efficiency by automatically responding to system disturbances. Power crisis is a major problem for a developing country like Bangladesh. Efficient transmission and distribution of electricity with essential energy resources is a fundamental requirement to provide citizens and economies. The paper analyzes the characteristics of Smart Grid and a comparative analysis with conventional grid system. It also discusses about the efficient transmission and distribution process which will integrate power system with renewable energy and information system.

关键词： Smart Grid Integration of Information and Power System Centralized & Distributed Generation System Transmission and Distribution System Performance Indicator Renewable Energy

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Recent Development of Sustainable Ecological Flame Retardant Textile Composite Material: A Review

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Journal of Materials Science and Chemical Engineering 2022年第6期10卷 30-44页

作者： Golam Mahmud faysal md. Arefin Kowser Mohammad Abdul Jalil Department of Textile Engineering Northern University Bangladesh Dhaka Bangladesh Department of Mechanical Engineering Dhaka University of Engineering & Technology (DUET) Gazipur Bangladesh Department of Textile Engineering Khulna University of Engineering & Technology (KUET) Khulna Bangladesh

The ecological and sustainable product is the demand of the present world. But it was not possible to produce an ecological and sustainable product for all sectors as the world requires now. The synthetic material is used to produce flame retardant materials due to the unavailable sustainable ecological flame-retardant material. But different researchers are trying to produce sustainable ecological flame-retardant material. This research found that the Spinach leaves Juice, banana pseudostem sap (SAP) and eggshell powder have flame retardant properties. Different literature shows that the ash also has flame retardant properties. So researcher suggested developing the composite material from the above materials with cotton fibres. It may be more effective as fire-retardant composite materials.

关键词： Sustainability Ecology Flame Retardant Material

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Electrical Load Forecasting Using Fuzzy System

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Journal of Computer and Communications 2019年第9期7卷 27-37页

作者： Mahir faysal md. Jahirul Islam md. Mohiuddin Murad md. Imdadul Islam M. Ruhul Amin Department of Electronics and Communications Engineering East West University Dhaka Bangladesh Department of Computer Science and Engineering Jahangirnagar University Savar Bangladesh Deparment of Mathematical and Physical Sciences East West University Dhaka Bangladesh

To cope with the demand and supply of electrical load of an interconnected power system of a country, we need to forecast its demand in advance. In this paper, we use a fuzzy system to forecast electrical load on short-term basis. Here, we consider temperature, humidity, seasons of a year and time segments of a day as the parameters, which govern the demand of electrical load. For each of the parameter, we use several membership functions (MFs) and then apply the Mamdani rule on MFs and the output is determined by using the centroid method. Finally, the surface plot reveals the real scenario of the load demand. The difference between actual load and the output of the fuzzy system is found as +1.65% to -13.76%. The concept of the paper can be applied in interconnected power system of Bangladesh to reduce power loss, especially when generation is higher than the demand.

关键词： Defuzzification Fuzzy Inference Centroid Method Surface Plot APE

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