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Modelling and optimization of nonylphenol biosorption by novel lowcost magnetic Chlorella vulgaris

Emerging Contaminants 2024年第3期10卷 170-180页

作者： Fatemeh Rahmani Nooshin Sajjadi mohammad hadi dehghani Mozhgan Zaeimdar Environmental Science and Technology Department Marine Science and Technology FacultyNorth Tehran BranchIslamic Azad UniversityTehranIran Department of Environmental Health Engineering School of Public HealthTehran University of Medical SciencesTehranIran Center for Solid Waste Research Institute for Environmental ResearchTehran University of Medical SciencesTehranIran

Discharging untreated wastewater causes environmental *** research examined the efficiency of removal and the adsorption process of Emerging Contaminant nonylphenol(NP)using magnetic Chlorella vulgaris(M-Chlorella vulgaris).The characterization of M-Chlorella vulgaris involved XRD,FESEM,EDS-Mapping,BET,FTIR,and VSM *** impact of four different parametersdpH,MChlorella vulgaris dose,initial concentration of NP,and contact time on the biosorption process was *** model and optimize the study while minimizing costs and the number of experiments,Response Surface Methodology(RSM)with Central Composite Design(CCD)was *** to the findings,the quadratic model with adjusted R^(2)=0.96 was the best fitted among the other *** pH=3.5,dosage=2.5 g/l,NP concentration=4 mg/l,and reaction time=70 min,which are the optimal parameters,the maximum removal effectiveness was about 91%.The Langmuir model(R^(2)=0.998)and pseudo-second-order model(R^(2)=0.997)exhibited the best fits for the adsorption isotherm and kinetic studies,*** characteristics of M-Chlorella vulgaris were determined to facilitate a spontaneous nature,and thermodynamic experiments indicated that the process of adsorption of nonylphenol is *** inexpensiveness and availability of adsorbent,suitable efficiency in the biosorption of pollutant and magnetic collection of pollutant from the aquatic environment can be mentioned as the advantages of this process.

关键词： RSM-CCD Nonylphenol Biosorption Algea Emerging contaminants M-Chlorella vulgaris

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Hydrogel-based materials as antibacterial agents and super adsorbents for the remediation of emerging pollutants:A comprehensive review

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Emerging Contaminants 2024年第3期10卷 46-67页

作者： Shabnam Ahmadi Sina Pourebrahimi Alhadji Malloum Majid Pirooz Christian Osagie Soumya Ghosh Muhammad Nadeem Zafar mohammad hadi dehghani Department of Environmental Health Engineering Faculty of Medical SciencesTarbiat Modares UniversityPO Box 14115-111TehranIran Department of Chemical and Materials Engineering Concordia University7141 Sherbrooke Street WestMontrealQuebecH4B 1R6Canada Department of Physics Faculty of ScienceUniversity of MarouaPO Box 46MarouaCameroon Department of Chemistry University of the Free StatePO Box 3399300BloemfonteinSouth Africa Research and Development Division Pad Jam Polymer Development Company(PJPC)and Department of Chemical EngineeringUniversity of Isfahan81746-73441IsfahanIran Stochastics and Its Applications Brandenburg University of Technology Cottbus-SenftenbergPlatz der Deutschen Einheit 103046CottbusGermany Natural and Medical Sciences Research Center University of NizwaNizwa616Oman Department of Chemistry University of Gujrat50700GujratPakistan Department of Environmental Health Engineering School of Public HealthTehran University of Medical SciencesTehranIran Center for Solid Waste Research Institute for Environmental ResearchTehran University of Medical SciencesTehranIran

Hydrogels have various potential applications due to their unique characteristics and recently,hydrogels have been utilized as adsorbents in wastewater treatment because of their ability to remove contaminants from *** strong hydrogels with high adsorption capabilities is crucial for effective wastewater *** and researchers are working to improve the properties of hydrogels by incorporating inorganic elements into polymer networks,which further reduces the costs as well as simplifies their *** polymers like starch and alginate are widespread due to their economic and biological advantages,such as biodegradability,biocompatibility,reduced toxicity,environmental friendliness,and low *** adsorption of pollutants onto hydrogels as well as their use as antimicrobial agents has garnered significant *** review paper summarizes the latest studies on using hydrogels as adsorbents to remove endocrine-disrupting chemicals(EDCs),persistent organic pollutants(POPs),and other emerging pollutants from water environments along with their use as antimicrobial *** the first step,different classes of hydrogels and different characterization techniques have been *** antimicrobial potential of hydrogels is elaborated to understand how these hydrogels can be a potential candidate for such *** discussing the adsorption application of hydrogels,different isothermal,kinetics and thermodynamics models have been discussed to highlight the mechanism and nature of forces involved in adsorption of *** different simulations such as DFT and MD have been discussed to get more holistic understanding of pollutants adsorption onto hydrogels.A limited number of studies have utilized other techniques such as Monte Carlo simulations and computational fluid dynamics(CFD)so it is important to explore a variety of computational methods to gain a comprehensive understanding of the adsorption process o

关键词： Hydrogel Emerging pollutant Adsorption Water and wastewater Monte Carlo simulations Antimicrobial activity

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Investigating the potential of using acoustic frequency on the degradation of linear alkylbenzen sulfonates from aqueous solution

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第9期8卷 1462-1468页

作者： dehghani mohammad hadi MAHVI Amir Hossein NAJAFPOOR Ali Asghar AZAM Kamal Department of Environmental Health Engineering School of Public HealthCenter for Environmental ResearchMedical Sciences/University of TehranTehranI.R. Iran Department of Environmental Health School of Public HealthMashhad University of Medical SciencesMashhadI.R. Iran Department of Epidemiology and Biostatistics School of Public HealthMedical Sciences/University of TehranTehranI.R. Iran

The effectiveness of using acoustical （sonochemical） reactor for degradation of linear alkylbenzen sulfonate （LAS） from aqueous solution was investigated. LASs are anionic surfactants, found in relatively high amounts in domestic and industrial wastewaters. In this study, experiments on LAS solution were performed using methylene blue active substances （MBAS） method. The effectiveness of acoustical processor reactor for LAS degradation is evaluated with emphasis on the effect of treatment time and initial LAS concentration. Experiments were performed at initial concentrations of 0.2, 0.5, 0.8 and 1.0 mg/L, acoustic frequency of 130 kHz, applied power of 500 W and temperature of 18℃-20℃. At the conditions involved, LAS degradation was found to increase with increasing sonochemical time. In addition, as the concentration increased, the LAS degradation rate decreased in the acoustical processor reactor.

关键词： Acoustical reactor Linear alkylbenzen sulfonate (LAS) Acoustic frequency Treatment time Power

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Migration Algorithm:A New Human-BasedMetaheuristic Approach for Solving Optimization Problems

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Computer Modeling in Engineering & Sciences 2023年第11期137卷 1695-1730页

作者： Pavel Trojovsky mohammad dehghani Department of Mathematics Faculty of ScienceUniversity of Hradec KrálovéHradec Králové50003Czech Republic

This paper introduces a newmetaheuristic algorithmcalledMigration Algorithm(MA),which is helpful in solving optimization *** fundamental inspiration of MA is the process of human migration,which aims to improve job,educational,economic,and living conditions,and so *** of the proposed MAis presented in two phases to empower the proposed approach in exploration and exploitation during the search *** the exploration phase,the algorithm population is updated based on the simulation of choosing the migration destination among the available *** the exploitation phase,the algorithm population is updated based on the efforts of individuals in the migration destination to adapt to the new environment and improve their ***’s performance is evaluated on fifty-two standard benchmark functions consisting of unimodal and multimodal types and the CEC 2017 test *** addition,MA’s results are compared with the performance of twelve well-known metaheuristic *** optimization results show the proposed MA approach’s high ability to balance exploration and exploitation to achieve suitable solutions for optimization *** analysis and comparison of the simulation results show that MA has provided superior performance against competitor algorithms in most benchmark ***,the implementation of MA on four engineering design problems indicates the effective capability of the proposed approach in handling optimization tasks in real-world applications.

关键词： Optimization metaheuristic migration human-based algorithm exploration exploitation

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Graphene oxide based carbon composite as adsorbent for Hg removal:Preparation, characterization, kinetics and isotherm studies

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Chinese Journal of Chemical Engineering 2017年第9期25卷 1170-1175页

作者： Tayebeh Esfandiyari Navid Nasirizadeh mohammad dehghani mohammad Hassan Ehrampoosh Department of Environmental Health Engineering Shaheed Sadoughi University of Medical Sciences Young Researchers and Elite Club Yazd Branch Islamic Azad University

The presence of Hg in the aqueous media is known to cause severe health issues in both humans and *** technologies and especially adsorbents have been applied for its removal. In this study, a graphene oxide–carbon composite(GO–CC) as a new adsorbent was prepared by sol gel procedure and characterized using field emission scanning electron microscopy, BET and EDX. The effects of different variables including solution p H, contact time, adsorbent dose and GO ratio in adsorbent matrix on the removal capacity of Hg were studied. The isotherm data correlated well with the Langmuir isotherm model. Further analysis recommended that the Hg^(2+) adsorption process is governed by the intra-particle and external mass transfer, in which the film diffusion was the rate restrictive step. The presented composite has maximum absorption capacity, q_(max) of 68.8 mg·g^(-1), which is comparable with carbon based adsorbent reported in the previous publications.

关键词： Adsorbent Mercury removal Sol gel Carbon composite

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Investigation and evaluation of ultrasound reactor for reduction of fungi from sewage

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第7期8卷 493-497页

作者： dehghani mohammad hadi MAHVI Amir Hossein JAHED Gholam Reza SHEIKHI Razieh Department of Environmental Health Engineering School of Public Health Medical Sciences/University of Tehran P.O. Box 14155-6145 Tehran I.R. Iran

The objective of the investigation was to study the application of ultrasound reactor technology (USRT) as a disin-fectant for reduction of fungi from sewage effluent. Fungi are carbon heterotrophs that require preformed organic compounds as carbon sources. USRT is an attractive means to improve water quality because of the system simplicity and no production of toxic by-products. An ultrasound reactor produces strong cavitation in aqueous solution causing shock waves and reactive free radicals by the violent collapse of the cavitation bubble. These effects should contribute to the physical disruption of microbial structures and inactivation of organisms. There was significant reduction in fungal growth, with decreased fungal growth with increasing USRT. In this study, ultrasound irradiation at a frequency of 42 kHz was used to expose suspensions of fungi to evaluate the disinfection efficacy of the ultrasound reactor. Also, this study showed that in this system more than 99% reduction of sewage fungi was achieved after 60 min.

关键词： Ultrasound reactor Sewage Fungi Cavitation Frequency

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A Chebyshev/Legendre polynomial interpolation approach for fingerprint orientation estimation smoothing and prediction

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第12期11卷 976-988页

作者： Ashkan TASHK mohammad Sadegh HELFROUSH mohammad Javad dehghani Faculty of Electrical Engineering Shiraz University of Technology Shiraz Iran

We introduce a novel coarse ridge orientation smoothing algorithm based on orthogonal polynomials, which can be used to estimate the orientation field (OF) for fingerprint areas of no ridge information. This method does not need any base information of singular points (SPs). The algorithm uses a consecutive application of filtering-and model-based orientation smoothing methods. A Gaussian filter has been employed for the former. The latter conditionally employs one of the orthogonal polynomials such as Legendre and Chebyshev type I or II, based on the results obtained at the filtering-based stage. To evaluate our proposed method, a variety of exclusive fingerprint classification and minutiae-based matching experiments have been conducted on the fingerprint images of FVC2000 DB2, FVC2004 DB3 and DB4 databases. Results showed that our proposed method has achieved higher SP detection, classification, and verification performance as compared to competing methods.

关键词： Coherence Consistency Fingerprint orientation Legendre/Chebyshev orthogonal polynomials

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Faunal data and envenomation emergency first aid of cone snails (Conus spp.) in Qeshm Island, the Persian Gulf

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Asian Pacific Journal of Tropical Medicine 2017年第12期10卷 1167-1171页

作者： Mehdi Khoobdel hadi dehghani Ali Mehrabi Tavana mohammad Ghasemi Seyyed mohammad Dakhteh Majid Askari Hesni Mohsen Rezaie-Atagholipour Health Research Center Baqiyatallah University of Medical SciencesTehranIran Department of Marine Biology Faculty of ScienceUniversity of HormozganBandar AbbasIran Health Management Research Center Baqiyatallah University of Medical SciencesTehranIran Environmental Management Office Qeshm Free Area OrganizationQeshm IslandIran Department of Biology Faculty of ScienceShahid Bahonar University of KermanKermanIran

Objective: To investigate the fauna of a highly venomous marine species group, the cone snails(Family Conidae), in the shores of Qeshm Island, of evaluating the possibility of envenomation in the area and summarize recommendations for emergency first ***: Shores surrounding Qeshm Island were surveyed to collect cone snails during cold(February and March) and warm(May and June) seasons of 2017. Collected snails were identified to the species level. Abundance and species richness were estimated in shores of different structures, including muddy and sandy-rocky shores. Also, the most updated medical literature was reviewed to summarize related emergency first ***: Three cone snail species were recorded from southern sandy-rocky shores of the Island, in decreasing order of abundance, included crowned cone(Conus coronatus)(65%), feathered cone(Conus pennaceus)(28%), and frigid cone(Conus frigidus)(7%).Abundance of these species were significantly higher in cold season compared to the warm season(P < 0.05). No cone snails were recorded along the northern muddy shores of the ***: Envenomation can cause various symptoms ranging from minor local pain to systemic paralysis and death due to respiratory failure. We recommend an awareness programme for the seashore visiting public.

关键词： Envenomation symptoms Subtropical coastal waters Sandy shores Venom

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ASSESSMENT OF BED-LOAD PREDICTORS BASED ON SAMPLING IN A GRAVEL BED RIVER

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Journal of Hydrodynamics 2012年第1期24卷 145-151页

作者： HADDADCHI Arman OMID mohammad H. dehghani Amir A. School of Environment Griffith UniversityNathanQld 4111Australia Department of Irrigation and Reclamation Engineering University of TehranTehranIran Department of Irrigation Engineering Golestan Agriculture and Natural Resources UniversityGorganIran

Bedload transport in alluvial channels has been extensively studied and different equations based on field and/or experimental data have been *** of bed-load transport rate using different equations results in wide ranges which are not always *** this study,some of the universal bedload predictors were evaluated with measured load by a Helley-Smith sampler in the Node River,a gravel bed river in the northeast part of *** 19 sets of data,14 series of data were used to evaluate the bed-load transport *** results show that the equations presented by Van Rijn,Meyer-Peter and Mueller,and Ackers and White may adequately predict bedload transport in the range of field data.

关键词： bedload transport gravel bed river bed-load sampling Gorgan-Iran

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Influence of the roughness and shape of quartz particles on their flotation kinetics

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International Journal of Minerals,Metallurgy and Materials 2012年第4期19卷 284-289页

作者： Mehdi Rahimi Fahimeh dehghani Bahram Rezai mohammad Reza Aslani Department of Mining and Metallurgical Engineering Amirkabir University of Technology Department of Mining Engineering Science and Research Branch Islamic Azad University

Surface roughness and shape play an important role on the behavior of particles in various processes such as flotation. In this re- search, the influence of different grinding methods on the surface roughness and shape characteristics of quartz particles as well as the effect of these parameters on the flotation of the particles was investigated. The surface roughness of the particles was determined by measuring their specific surface area via the gas adsorption method. The shape characteristics of the particles were measured and calculated by images obtained by scanning electron microscopy via an image analysis system. The flotation kinetics was determined using a laboratory flotation cell. The results showed that the particles of rod mill products have higher roughness and elongation ratio and lower roundness than the parti- cles of ball mill products. The flotation kinetics constant of the particles increased with their surface roughness increasing. Particles with higher elongation and lower roundness indicated higher floatability. In addition, the influence of the surface roughness on the flotation kinet- ics was greater than that of shape parameters.

关键词： flotation kinetics quartz shape parameters surface roughness

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