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( Mahshab Sheraz ),( Ali Anus ),정상재 ( Sangjae Jeong ),김승도 ( Seungdo Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 추계학술발표논문집 Vol.2019 No.-
사불화탄소(CF4)는 이산화탄소의 6,300배의 지구온난화 효과를 가지는 6대 온실가스 중 하나이다. 사불화탄소는 구조가 안정적이며 C-F 결합이 매우 강력해 자연상태에서 수명이 5만 년으로 오랜 시간 잔류하게 된다. 따라서 온실가스 저감을 위해 촉매열가수분해 기술의 도입이 반드시 필요하다. 본 연구에서는 사불화탄소의 분해를 위해 ɣ-Al<sub>2</sub>O<sub>3</sub>와 Ti(10)/Al<sub>2</sub>O<sub>3</sub>, La(10)/Al<sub>2</sub>O<sub>3</sub>를 이용해 다양한 온도(500℃, 600℃, 700℃, 800℃)에서 촉매열 가수분해를 수행하였다. 사불화탄소는 고온에서 수분과 만나 이산화탄소와 불화수소로 분리되므로 수분함량에 따른 분해 효율을 파악하기 위해 수분 주입량을 0.5 ml/hr, 0.8 ml/hr, 1.0 ml/hr로 구분하여 분해실험을 수행하였다. 촉매는 1.2g 주입하였으며, plug-flow 반응기를 이용해 분해실험을 수행하였다. 가스의 총 유량은 100ml/min으로 사불화탄소 2 ml/min과 질소 밸런스 가스로 구성되었다. ɣ-Al<sub>2</sub>O<sub>3</sub> 촉매 하에서 반응온도 800℃, 수분주입량 0.5ml/hr인 경우 사불화탄소의 분해효율이 약 80% 이상으로 가장 높게 나타났다. 사용 전과 후 촉매의 물성변화를 파악하기 위해 XRD, TGA, NH<sub>3</sub>-TPD를 수행하였다.
Mahshab Sheraz,Van Cam Thi Le,김승도 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
Air filtration has become an essential need for passive pollution control particularly, 2019 novel coronavirus. Most of the commercial air purifiers contain fibrous filters, which gave good particulate matter (PM) removal capability but poor microorganism and VOC’s removal efficiency. Herein, we introduced a facile and eco-friendly synthesis of copper coordination polymer particle (Cu-CPP)- decorated on mesoporous Al₂O₃ beads for air pollution control treated with Cu-CPP organic ligands, and Cu species was poured on the Al₂O₃ by hydrothermal method. The composite CuBTC/Al₂O₃ beads exhibited excellent performance with 100% adsorptive capacity of highly carcinogenic VOCs. In addition, the CuBTC/Al₂O₃ revealed a potent inactivation rate of E. coli bacteria with ~99.99% rapid inactivation rate within 20 minutes. The physicochemical properties of CuBTC/Al₂O₃ were studied through (XRD, BET, EDX, TGA) analysis. We believe this work can open a new pathway for designing a practical adsorptive and antimicrobial technology using ubiquitous CuBTC/Al₂O₃ beads in air purifiers could be a game-changer for public health protection.
( Mahshab Sheraz ),( Sangjae Jeong ),( Ali Anus ),( Caroline Mercy Andrew Swamidoss ),( Seungdo Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 심포지움 Vol.2019 No.1
The catalytic decomposition of HFC-134a was carried out with Alumina and different (wt %) of Magnesium doped alumina at 600°C reaction temperature. The catalyst were calcined at 650°C and their thermal degrading behaviour were determined by using Thermogravimetric analysis for determining the weight loss of Spent-catalysts. For decomposition test of HFC-134a used plug flow reactor connected directly to gas chromatography/mass spectrometry system. Although 99% Conversion rate was achieved and stability was more than 6 hours and less coke formation by using Mg(5)Al<sub>2</sub>O<sub>3</sub>. By the addition of Mg metal in γ-Al<sub>2</sub>O<sub>3</sub> showed crucial role but could not prevented from fluorination. However high amount of metal content can blocked the pores of catalyst and reaction was decreased rapidly. There was also the formation of valuable by-product trifluoroethylene eco-friendly gas as a result of decomposition of high GWP gas HFC-134a. The catalytic activity order of different (wt %) Mg based alumina catalyst is Mg(5)Al<sub>2</sub>O<sub>3</sub> > γ-Al<sub>2</sub>O<sub>3</sub> > Mg(20)Al<sub>2</sub>O<sub>3</sub> > Mg(30)Al<sub>2</sub>O<sub>3</sub> > Mg(70)Al<sub>2</sub>O<sub>3</sub>, respectively.
Muhammad Awais,Mahshab Sheraz,Van Cam Thi Le,강은실,김승도 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
Carbon-doped TiO₂ nanocomposites have been used widely in the photocatalytic world as newly emerging and promising materials due to their fascinating physicochemical properties. Visible light-driven, C-TiO₂ was prepared by single pot annealing method to remove the p-xylene from the indoor air environment. In this work, the effect of momentous parameters such as carbon content and initial contaminant concentrations were evaluated. The C-TiO₂ was coated on an immobilized glass plate that enhanced photocatalytic degradation of gas-phase p-xylene. Diffuse Reflectance Spectroscopy (DRS) results disclosed the redshift by incorporating carbon atoms into the crystal structure of TiO₂ and prominent narrowing the bandgap energy. Spherical-shaped particles of C-TiO₂ were revealed by Scanning Electron Microscopy (SEM) with a 13 nm average grain size. The results indicate that the 15 mg of carbon source (ascorbic acid) shows a higher photocatalytic efficiency up to 50%, and the impact of initial contaminant concentration exhibited the inverse relationship with efficiency.
Ali Anus,Mahshab Sheraz,정상재,Caroline Mercy Andrew Swamidoss,김영민,Muhammad Awais Aslam,김의건,김승도 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.6
During catalytic pyrolysis of HFC-134a over γ-alumina, the formation of HF and coke causes catalyst deactivation. Catalyst deactivation and product selectivity depend on the contact time during catalytic pyrolysis of HFC- 134a as reported in this paper. γ-Alumina calcined at 650 oC was used as the catalyst due to its higher quantity of acidic sites and larger surface area, which are crucial for catalytic pyrolysis. X-ray diffraction (XRD), scanning electron microscope- energy dispersive X-ray spectroscopy (SEM-EDS), and thermogravimetric analysis (TGA) of the catalysts were performed to determine the influence of contact time and flow rate of HFC-134a. 2mL/min of HFC-134a balanced with nitrogen to 25, 50, 100, and 200mL/min total flow rates was studied at 600 oC. 200mL/min showed a 9.4 h catalyst lifetime with a small number of by-products. Shorter contact time between HFC-134a and HF with the catalyst was found to be the key to the longer lifetime of the catalyst. The catalyst lifetime was decreased with an increase in the HFC-134a input amount. Among 2, 4, and 6mL/min input of HFC-134a, 2mL/min showed the longest catalytic activity followed by 4 and 6mL/min, respectively. Conversion of γ-alumina into AlF3 and deposition of coke were responsible for the deactivation.
Van Cam Thi Le,Mahshab Sheraz,강은실,윤소영,Muhammad Awais,김승도 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
This paper introduces a multifunctional air filter with a strong ability to trap and disinfect pathogens and absorb particulate matter (PM), volatile organic compound (VOC), and CO₂. This study demonstrates a facile and ecofriendly synthesis of copper coordination polymer particle (Cu-CPP)-decorated nonwoven fiber filters (Cu-CPP/NWF) via an in situ growth dip-coating method. Their multifunction potentials in air pollution treatment are also assessed. Specifically, Cu-CPP/NWF showed a remarkable performance for air treatment, with 100% disinfection efficiency against airborne bacteria in 45 min, 99.99% PM removal efficiency, 100% p-xylene VOC adsorption efficiency, and high potential CO₂ uptake capacities (19.81 cm³/g). Cu-CPP can work as an antibacterial agent and an adsorbent component, thus offering a wide range of applications. This study provides valuable insight to the development of a multifunctional air filter proven to be a life-saving product for public health protection, especially during the SARS-CoV-2 pandemic.