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RISS 인기검색어
- 검색키워드
- 저자 : Habibollah Younesi (검색결과 4 건)
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Faezeh Mahdad,Habibollah Younesi,Nader Bahramifar,Mojtaba Hadavifar 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.6
In the present study, the application of advanced oxidation processes (AOPs) for the treatment of composting leachate by an activated sludge process was investigated. The efficiency of Fenton process and photo-Fenton process for treatment of high Chemical Oxygen Demand (COD), color and turbidity removal was investigated using Response Surface Methodology (RSM) under Central Composite Design (CCD). Optimal removal efficiencies were achieved 55.91% and 75.53% in Fenton process and 69.64 and 84.09% in a photo-Fenton process for CODCr and color removal, respectively at initial pH 4.5, hydrogen peroxide dosage 1 ml/L, iron sulfate dosage 0.75 g/L and Ultra-Violet (UV) contact time 78 min. Furthermore, results indicated that the BOD5/COD ratio was increased from 0.2 to 0.52, which in turn increases wastewater biodegradability. Results showed that initial pH in the photo-Fenton process had an enormous effect on CODCr removal efficiency. In consequence, the photo-Fenton process was more efficient process in CODCr and color removal for composting leachate.
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Afsaneh Shahbazi,Habibollah Younesi,Alireza Badiei 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
Organofunctionalized nanostructured silica SBA-15 with tri(2-aminoethyl)amine tetradentate-amine ligandwas synthesized and applied as adsorbent for the removal of Cu2+, Pb2+, and Cd2+from both synthetic wastewater andreal paper mill and electroplating industrial effluents. The prepared materials were characterized by XRD, N2 adsorp-tion-desorption, TGA, and FT-IR analysis. The Tren-SBA-15 was found to be a fast adsorbent for heavy metal ionsfrom single solution with affinity for Cu2+, Pb2+, than for Cd2+due to the complicated impacts of metal ion electronega-tivity. The kinetic rate constant decreased with increasing metal ion concentration due to increasing of ion repulsionforce. The equilibrium batch experimental data is well described by the Langmuir isotherm. The maximum adsorptioncapacity was 1.85 mmol g−1for Cu2+, 1.34 mmol g−1for Pb2+, and 1.08 mmol g−1for Cd2+at the optimized adsorptionconditions (pH=4, T=323 K, t=2 h, C0=3mmol L−1, and adsorbent dose=1 g L−1). All Gibbs energy was negative asexpected for spontaneous interactions, and the positive entropic values from 103.7 to 138.7 J mol−1K−1also reinforcedthis favorable adsorption process in heterogeneous system. Experiment with real wastewaters showed that approxi-mately a half fraction of the total amount of studied metal ions was removed within the first cycle of adsorption. Hence,desorption experiments were performed by 0.3M HCl eluent, and Tren-SBA-15 successfully reused for four adsorp-tion/desorption cycles to complete removal of metal ions from real effluents. The regenerated Tren-SBA-15 displayedalmost similar adsorption capacity of Cu2+, Pb2+, and Cd2+even after four recycles. The results suggest that Tren-SBA-15is a good candidate as an adsorbent in the removal of Cu2+, Pb2+, and Cd2+from aqueous solutions.
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Aghdas Heidari,Ralph Stahl,Habibollah Younesi,Alimorad Rashidi,Nicole Troeger,Ali Asghar Ghoreyshi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The fast pyrolysis of eucalyptus wood was conducted in a continuous-feed fluidized bed reactor. The effect of pyrolysis temperature, nitrogen flow rate, biomass feed rate and biomass feed size was investigated. The results showed that with increasing nitrogen flow rate, the bio-oil yield firstly increased from 51.9% to 61.1% and then decreased to 59.9%. The maximum percentage of syringol and guaiacol were 16.27 and 8.98 at temperature of 450 and 600 ℃, respectively. The maximum bio-oil yield was 71.1%. The maximum percentage of CO was 44.1 at a flow rate 11.1 L/min, feed size 1.5 and feeding rate 1.7 g/min.
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Rastgar Saeedeh,Rezaei Hassan,Younesi Habibollah,Abyar Hajar 한국탄소학회 2024 Carbon Letters Vol.34 No.6
The intensive development of the petrochemical industry globally reflects the necessity of an efficient approach for oily sludge and wastewater. Hence, for the first time, the current study utilized magnetic waxy diesel sludge (MWOPS) to synthesize activated carbon coated with TiO2 particles for the removal of total petroleum hydrocarbons (TPH) and COD from oily petroleum wastewater (OPW). The photocatalyst was characterized using CHNOS, elemental analysis was performed using X-ray fluorescence spectroscopy (XRF), field emission scanning electron microscope (FESEM), high-resolution transmission electron microscope (HR-TEM), X-ray diffraction analysis (XRD), Fourier transform infrared spectrometer (FTIR), Raman, energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), MAP thermo-gravimetric analysis/differential thermo-gravimetric (TGA–DTG), Brunauer–Emmett–Teller (BET), diffuse reflectance spectroscopy (DRS), and vibrating sample magnetometer (VSM). The optimization of synthesized highly porous AC/Fe3O4/TiO2 photocatalyst was conducted considering the impacts of pH, temperature, photocatalyst dosage, and UVA6W exposure time. The results demonstrated the high capacity of the MWOPS with inherent magnetic potential and desired carbon content for the removal of 91% and 93% of TPH and COD, respectively. The optimum conditions for the OPW treatment were obtained at pH 6.5, photocatalyst dosage of 250 mg, temperature of 35 °C, and UVA6W exposure time of 67.5 min. Moreover, the isotherm/kinetic modeling illustrated simultaneous physisorption and chemisorption on heterogeneous and multilayer surfaces. Notably, the adsorption efficiency of the AC/Fe3O4/TiO2 decreased by 4% after five adsorption/desorption cycles. Accordingly, the application of a well-designed pioneering photocatalyst from the MWOPS provides a cost-effective approach for industry manufacturers for oily wastewater treatment.
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