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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.