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Ali Akbar Babaei,Alireza Khataee,Elham Ahmadpour,Mohsen Sheydaei,Babak Kakavandi,Zahra Alaee 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
Activated spent tea (AST) was prepared and characterized by using different techniques such as BET, FTIR and SEM. It is used for methylene blue (MB) dye removal from aqueous solution in a batch system. Experimental results showed that natural basic pH, increased initial dye concentration, and high temperature favored the adsorption. Analysis based on the artificial neural network (ANN) indicated that the adsorbent dose and time with the relative importance of 30.03 and 35.44%, respectively, appeared to be the most influential parameters in the MB adsorption. The adsorption of MB was relatively fast and the Avrami fractional order and pseudo-second-order kinetic models showed satisfactory fit with the experimental data. The equilibrium data were well fitted by the Langmuir and Liu isotherm models, with a maximum sorption capacity of 104.2mg/g. Also, the obtained values of thermodynamic parameters showed that the adsorption of MB onto AST is endothermic and spontaneous. The results of this study indicated that AST was a reliable adsorbent for removing cationic dyes from wastewater.
Ali Akbar Babaei,Babak Kakavandic,Mohammad Rafiee,Fariba Kalantarhormizi,Ilnaz Purkaram,Ehsan Ahmadi,Shirin Esmaeili 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-
Textile wastewater was treated using an enhanced simultaneous adsorption/oxidation process withmagnetic nanoparticles-functionalized carbon (MNPs@C) and H2O2, UV and ultrasonic (US). Bothfilmandpore-diffusion affect adsorption mechanisms were included in the adsorption process. The dyeadsorption was enhanced by oxidative degradation in the present of H2O2 with the suitability in order ofUV-Fenton > US-Fenton > Fenton. Catalytic potential of 47% was observed for MNPs@C/H2O2/UV system. For UV-Fenton system 94.8% removal of dye with minimal iron leaching was observed after 5 times ofrecycle. Increasing catalytic activity of MNPs@C on direct red 16 (DR16) degradation follows the order ofPMS > PS > H2O2.
Forough Gashtasbi,Reza Jalilzadeh Yengejeh,Ali Akbar Babaei 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.8
The simultaneous presence of antibiotics and bacteria in aqueous media has been recognized as an environmental threat, due to the enhancement of antibiotic resistance of bacteria. We synthesized an activated carbon impregnated magnetite composite (PAC/Fe3O4) and used it for removal of cephalexin (CEX) from aqueous solution via UV system. A series of batch experiments was carried out under various experimental conditions such as pH of solution (3-11), contact time (0-120 min), catalyst dosages (0.1-2 g/L) and initial CEX concentrations (10, 25, 50 and 100 mg/L). Some common isotherm models were used for study of CEX adsorption and finding the best model. In addition, kinetic studies of CEX photocatalytic removal were performed by fitting the experimental data on first-order and second-order models. Results of comparative studies showed that UV+PAC/Fe3O4 and UV+TiO2 systems, compared to UV/Fe3O4, naked Fe3O4, PAC/Fe3O4 and UV only, had more capability of removing CEX from aqueous solution, indicating PAC/Fe3O4 is effectively catalyzed by UV light. Furthermore, increasing catalyst dosages and decreasing initial CEX concentrations led to the enhancing photocatalytic removal of CEX from solution. The obtained results of kinetic studies also represent that among the studied models, second-order model with significant coefficient of correlation (R2) had higher ability than first-order model to fit the data of CEX removal. Finally, the findings of reusability tests, showed that the applied catalyst would be applicable for CEX removal, even after five consecutive cycles.
Samira Samarbaf,Yaser Tahmasebi Birgani,Mohsen Yazdani,Ali Akbar Babaei 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.73 No.-
In this study, optimization of adsorptive removal of two cationic (methylene blue (MB)) and anionic (acidred 73 (AR 73)) dyes with modified oak waste (MOW) adsorbent was carried out using response surfacemethodology (RSM). The input variables included initial solution pH (2–10), contact time (20–200 min),adsorbent dosage (0.5–2.5 g/L) and initial dyes concentrations (10–90 mg/L). Furthermore, the surfaces ofthe adsorbent were modified with different modifiers tofind the most efficient adsorbent. The obtainedresults of comparative studies on dyes adsorption confirm that sodium hydroxide, compared to othermodifiers, has the highest ability to activate the surfaces of the oak waste (OW) to remove dyes from thesolution. Using NaOH, the removal efficiency of MB and that of AR 73 were obtained to be 96% and 29%,respectively. In addition, results of the optimization study showed that RSM could significantly predictthe experimental data of dyes removal with a high correlation coefficient (0.991 for MB and 0.993 for AR73). The optimum experimental conditions for dyes removal were pH of 6.2, 160 min contact time, 2.0 g/Ladsorbent dosage and 70 mg/L initial dye concentrations. Under this condition, the removal efficiency forMB and AR 73 reached 85.36% and 41.27%, respectively. Ultimately, from thefindings of this study, it isobserved that MOW can be used as an efficient and cost-effective adsorbent for the removal of dyes fromthe contaminated aqueous solution.
Afshin Takdastan,Samira Samarbaf,Yaser Tahmasebi Birgani,Nadali Alavi,Ali Akbar Babaei 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
Heavy metals are kind of toxic substances which are abundant in all municipal, agricultural, industrialand treated wastewaters. In this research, a comparative study was carried out for adsorptive removal ofCd2+ from aqueous solution using raw oak waste and NaOH-activated oak waste at different experimentalconditions namely, pH of solution (2–8), contact time (5–240 min), adsorbent dosages (0.1–10 g/L) andinitial Cd2+ concentrations (25–100 mg/L). In addition, the experimental data of Cd2+ adsorption werefitted with different isotherm and kinetic models to determine the most appropriate model. Artificialneural network (ANN) model was also used tofind the effect of each individual parameter on Cd2+adsorptive removal. Based on the results of batch experiments, adsorbent dosages and initial Cd2+concentrations had direct and indirect relationships with Cd2+ removal, respectively. Furthermore,among all applied isotherm and kinetic models, Langmuir isotherm model and Avrami fractional-orderkinetic models could best-fitted with the experimental data of Cd2+ removal. The results ofthermodynamic studies revealed that the adsorption of Cd2+ onto the surfaces of oak waste adsorbentsis exothermic and spontaneous. Finally, according to thefindings of ANN studies, this approach couldmodel the role of each parameter on Cd2+ removal with high coefficient of correlation (>0.99). Accordingly, pH of solution and temperature had the highest and lowest influence on removal of Cd2+from solution, respectively. The results implied that oak waste can be selected as a promising andenvironmentally friendly adsorbent for the effective remediation of water bodies containing heavymetals.
Ahmad Jonidi Jafari,Babak Kakavandi,Nemat Jaafarzadeh,Roshanak Rezaei Kalantary,Mehdi Ahmadi,Ali Akbar Babaei 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
Fenton-like catalytic degradation of tetracycline (TC) was studied by using ferro–ferric oxide (Fe3O4)nanoparticles coated on activated carbon (AC@Fe3O4) which acts as a peroxidase mimetic and persulfate(PS) as a green oxidant. Adsorption and degradation experiments were carried out in a batch system asfunctions of pH, PS, catalyst and TC concentrations. Kinetic and pathway of TC degradation by AC@Fe3O4/PS system was also investigated. Under the optimum conditions, the removal efficiency of TC and totalorganic carbon (TOC) were 99.8 and 50.6%, respectively. AC@Fe3O4 retained its activity and degradationefficiency remained even afterfive concessive cycles of use
Babak Kakavandi,Ahmad Jonidi Jafari,Roshanak Rezaei Kalantary,Hamed Gharibi,Anvar Asadi,Ali Azari,Ali Akbar Babaei,Afshin Takdastan 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.10
Discharging the effluents of textile wastewaters into potable water resources can endanger the ecosystem, due to their reactivity, toxicity, and chemical stability. In this research, the application of powder activated carbon modified with magnetite nanoparticles (PAC-MNPs) as an adsorbent for removal of reactive dyes (Reactive black 5 (RB5) and reactive red 120 (RR120)) was studied in a batch system. The adsorption performance was evaluated as a function of temperature, contact time and different adsorbent and adsorbate concentrations. The levels of factors were statistically optimized using Box-Behnken Design (BBD) from the response surface methodology (RSM) to maximize the efficiency of the system. The adsorption process of both dyes was fit with the pseudo-second order kinetic and Langmuir isotherm models. The identified optimum conditions of adsorption were 38.7 oC, 46.3 min, 0.8 g/L and 102mg/L for temperature, contact time, adsorbent dose, and initial dyes concentration, respectively. According to the Langmuir isotherm, the maximum sorption capacities of 175.4 and 172.4mg/g were obtained for RB5 and RR120, respectively. Thermodynamics studies indicated that the adsorption process of the reactive dyes was spontaneous, feasible, and endothermic. After five cycles, the adsorption efficiency was around 84 and 83% for RB5 and RR120, respectively. A high value of desorption was achieved, suggesting that the PAC-MNPs have a good potential in regeneration and reusability, and also can be effectively utilized in industrial applications. PAC-MNPs also show a good anti-interference potential for removal of reactive dyes in dye-industry wastewaters.
Landfill Site Selection using GIS and AHP: a Case Study: Behbahan, Iran
Zeinab Ghaed Rahmat,Mehdi Vosoughi Niri,Nadali Alavi,Gholamreza Goudarzi,Ali Akbar Babaei,Zeinab Baboli,Mohsen Hosseinzadeh 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.1
Finding a suitable site to dispose solid waste is a difficult task for municipality because it is necessary to consider the different factors and criteria in the landfill siting process. In this study, in order to consider all parameters, a combination of Geographic Information System (GIS) and the Analytic Hierarchy Process (AHP) was used for landfill site selection. For the purpose of making decisions in landfill site selection a hierarchy structural was formed and different parameters have been identified, including distance to groundwater, distance to surface water, sensitive ecosystems, land cover, distance to urban and rural areas, land uses, distance to roads, slope, soil type and distance to waste generation places. At first, the rating method was used to evaluate each criterion individually. Then, the relative importance of criteria to each other was determined by an analytic hierarchy process (AHP). Simple Additive Weighting (SAW) method was applied to evaluate the land suitability. The results showed that 38% of the study area have high suitability for land filling. Finally, five sites were a candidate for field investigation with more details.