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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.
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
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.
Mohamadreza Massoudinejad,Anvar Asadi,Mehdi Vosoughi Niri,Morteza Gholami,Babak Kakavandi,Mohammad Amin Karami 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.10
The sorption of As(V) on manganese oxide coated zeolite (MOCZ) was investigated through batch study to explore the feasibility of removing arsenic from groundwater. MOCZ was characterized by scanning electron microscopy, XRD, FTIR spectroscopy, and point of zero charge (pHPZC) measurements. The effects of process parameters such as contact time, adsorbent size, temperature and pH were investigated. Arsenic detection was carried out by atomic fluorescence spectrometer. Arsenate adsorption onto MOCZ followed the pseudo-second-order kinetic model with a correlation coefficient more than 0.99. Optimum removal of arsenate occurred within pH range of 6-10. The equilibrium data were analyzed by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models. The maximum adsorption capacity calculated from the Langmuir and D-R models was 151 and 152.8 μg g−1, respectively, at 38 oC. The activation energy of adsorption (Ea) was found to be 3.68 kj mol−1, suggesting that the adsorption process may be physical sorption. Thermodynamic parameters: ΔHo, was 1.181 kj mol−1; ΔSo, was −0.29 kj mol−1, while the values of ΔGo were −83.9, −86.7 and 89.8 kj mol−1 at 18, 28 and 38, respectively, suggesting endothermic and spontaneous process and a rise in temperature favoring the adsorption.