در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Progress in Chemical and Biochemical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,Refinery,Effluent,Fenton,Nano Filtration
- چکیده:
- چکیده انگلیسی: This paper reviews Fenton processes, adsorption and nano filtration processes. Wastewater is one of the substances that has been neglected even in recent years in the country. Industrial effluents can have a great variety depending on the type of production and process of industrial units. In other words, for each production line in industrial units, a specific effluent may be produced, the quality and environmental effects of which will depend on the type of material and its content. These effluents are often caused by chemical processes and therefore will create more potential hazards than normal effluents in the environment. Although refineries and petrochemical industries are widely expected to benefit the community, they produce significant volumes of effluents. Effluents produced in refineries are generally considered as hazardous effluents due to their high amounts and high concentrations of oily and petroleum compounds, as well as acids and heavy metals. Protecting the environment against pollution of oil, gas and petrochemical industries has created great concerns from the environmental point of view. Therefore, it is necessary to identify and study the effluents of these units and provide solutions to control their pollution.
- انتشار مقاله: 10-04-1399
- نویسندگان: Moslem Shahamatpour,Seyed Mostafa Tabatabaee Ghomsheh,Sara Maghsoudi,Shima Azizi
- مشاهده
- جایگاه : پژوهشی
- مجله: Progress in Chemical and Biochemical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,Nanofiltration,Membrane,Haloacetonitrile
- چکیده:
- چکیده انگلیسی: In this study removal of haloacetonitriles from aqueous solution by employing a novel hybrid filtration process is investigated. The application potential of the oxidized multi-walled carbon nanotubes (O-MWCNTs) as adsorbent was investigated by evaluating the effect of different process parameters. Solution pH significantly affected the removal of DCAN (as a model of HANs) due to its strong effect on the charges of the adsorbent and the adsorbate. A maximum DOC removal of 98.7% for was achieved with 150 mg/L oxidized MWCNTs dosage and at a solution pH of 8. Finally, the nanofiltration technique using a PBS membrane was effectively employed to reject the wastewater pollutants (HANs) proprly.
- انتشار مقاله: 08-05-1399
- نویسندگان: Mohsen Vaziri,Seyed Mostafa Tabatabaee Ghomsheh,Alireza Azimi,Masoomeh Mirzaei Ghaleh Ghobadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Chemical Methodologies
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,Haloacetonitrile,Nano-filtration,Hybrid adsorption
- چکیده:
- چکیده انگلیسی: The haloacetonitriles (HANs) exist in drinking water exclusively as byproducts of disinfection. HANs are found in drinking water more often with higher concentrations. Human exposure occurs through consumption of finished drinking water, oral and dermal contact as well as when showering, swimming and other activities. The purpose of this study was to investigate the novel hybrid adsorption/ PBS membrane filtration process used to remove haloacetonitriles from aqueous solution. The efficiency of the PAC adsorbent was also evaluated at different pH, which confirmed efficacy of PAC at pH of 8.A maximum removal of DOC (98.7%) was obtained with 150 mg/L PAC dosage at a solution pH of 8. HANs sorption process followed the pseudo second order kinetic model and the Langmuir isotherm gave the best correlation of adsorption.
- انتشار مقاله: 18-03-1399
- نویسندگان: Mohsen Vaziri,Seyed Mostafa Tabatabaee Ghomsheh,Alireza Azimi,Masoomeh Mirzaei
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Environmental Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Carbon Dioxide,absorption kinetics,nanoparticle,anionic surfactant,amine solvent
- چکیده:
- چکیده انگلیسی: Amine solvents are extensively used on an industrial scale for removing carbon dioxide (CO2). The presence of some additives in amine solvents has a desirable effect on CO2 absorption kinetics and also improves the absorption process. In this study, graphene oxide (GO) nanoparticles and the anionic surfactant sodium dodecyl sulphate (SDS) were used as additives to the amine solvent. The number of CO2 moles that were used (ng), the values of the diffusion coefficient (DAB), and the mass transfer coefficients of CO2 gas absorption in the amine solvent (Kc) were determined. Furthermore, the effect of the additives on the kinetics of CO2 gas absorption in the amine solvent was investigated. The results showed that mass transfer coefficients increased with a decrease in pressure and an increase in temperature as well as in the SDS and GO concentrations. The values of the mass transfer coefficient under different conditions varied between 0.0311 and 0.0587 cm/s. The molecular diffusion coefficient of CO2 in the amine solvent increased from 0.000025 to 0.000287 cm2/s with decreases in the pressure and with increases in the temperature and increases in concentrations of additives. The laboratory data were statistically analyzed via Design-Expert software using response surface experiment design and a historical method. A mathematical relation was proposed to estimate the mass transfer coefficients. Moreover, a mathematical relation was introduced to predict the molecular diffusion coefficient of CO2 in the amine solvent.
- انتشار مقاله: 25-07-1397
- نویسندگان: Abdollah Mohammadpoor,Masoomeh Mirzaei,Alireza Azimi,Mostafa Tabatabaee Ghomshe
- مشاهده