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- 저자 : Shengbo Ge (검색결과 2 건)
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Vikrant, Kumar,Kim, Ki-Hyun,Peng, Wanxi,Ge, Shengbo,Sik Ok, Yong Elsevier 2020 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.387 No.-
<P><B>Abstract</B></P> <P>Recently, biochars have been proposed as highly efficient and low-cost media for the adsorptive removal of various hazardous compounds. However, there is a dearth of literature focusing on adsorption performance of biochars against gaseous volatile organic compounds (VOCs). In light of this limitation, the adsorption performances of 12 standard biochars made of six different raw materials (i.e., <I>Miscanthus</I> straw pellets, oil seed rape straw pellets, rice husk, sewage sludge, soft wood pellets, and wheat straw pellets) at two pyrolysis temperature conditions (i.e., 550 °C and 700 °C) were investigated against two model gaseous VOCs (i.e., benzene and methyl ethyl ketone (MEK)) at 1 Pa each. The breakthrough volume (BTV) and partition coefficient (PC) of benzene at 10% BTV, when measured for all these biochars, varied from 1.4 to 10 L atm g<SUP>−1</SUP> and 6.E-04 to 1.4E-02 mol kg<SUP>−1</SUP> Pa<SUP>−1</SUP>, respectively. Similarly, their counterpart values for MEK were 1.8 to 40 L atm g<SUP>−1</SUP> and 1.E-03 to 2.E-03 mol kg<SUP>−1</SUP> Pa<SUP>−1</SUP>, respectively. The largest adsorption capacity values for benzene (2.9 mg g<SUP>−1</SUP>) and MEK (43 mg g<SUP>−1</SUP>) were observed from the soft wood pellet biochar prepared at 700 °C (SWP700) and rice husk biochar prepared at 550 °C (RH550), respectively. The results indicate that most biochars adsorbed MEK preferentially over benzene. The adsorption of MEK appeared to be primarily influenced by surface features and composition of each specific biochar, while that of benzene was proportionate to their surface area. Overall, the results of this investigation are expected to help establish technical standards for effective removal of gaseous VOCs by biochars.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Biochar is a carbon-based material that can be utilized as an adsorbent. </LI> <LI> 12 standard biochars were analyzed for the capture of gaseous benzene and MEK. </LI> <LI> Rice husk biochar prepared at 550 °C showed the highest capacity of 43 mg g<SUP>−1</SUP> for MEK. </LI> <LI> Soft wood pellet biochar prepared at 700 °C showed the best performance for benzene. </LI> <LI> Most of the analyzed biochars preferably adsorbed MEK as compared to benzene. </LI> </UL> </P>
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Phenol removal via activated carbon from co-pyrolysis of waste coal tar pitch and vinasse
Ming Gao,Xiaona Wang,Changlei Xia,Na Song,Yuhui Ma,Qunhui Wang,Tianxue Yang,Shengbo Ge,Chuanfu Wu,Su Shiung Lam 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.1
The behavior and characteristics of phenol adsorption by activated carbon produced from co-pyrolysis of coal tar pitch and vinasse were investigated. Coal tar pitch and vinasse (mass ratio of 1 : 3) were firstly co-pyrolyzed and carbonated at 400 oC for 2 h. The carbonized material produced was then soaked with saturated KOH solution and activated at 800 oC for 1 h to form activated carbon. Results from the phenol wastewater adsorption experiments suggest that pseudo-second-order kinetics and the Weber-Morris model could reflect the time-dependent adsorption behavior of phenol wastewater by the activated carbon, revealing that internal diffusion represents the rate-limiting procedure and dominant process to control the adsorption rate in the early stage of the adsorption. Monolayer adsorption played the key role during the phenol adsorption. The adsorption was an endothermic reaction in temperature ranging from 15 oC to 35 oC, indicating that the adsorption speed could be stimulated by the increasing temperature. This study establishes a theoretical foundation for the usage and the potential application of the activated carbon derived from coal tar pitch and vinasse in wastewater treatment.
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