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- 저자 : ( Tingting Zang ) (검색결과 2 건)
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Biosorption of Lead(II) by Arthrobacter sp. 25: Process Optimization and Mechanism
( Yu Jin ),( Xin Wang ),( Tingting Zang ),( Yang Hu ),( Xiaojing Hu ),( Guangming Ren ),( Xiuhong Xu ),( Juanjuan Qu ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.8
In the present work, Arthrobacter sp. 25, a lead-tolerant bacterium, was assayed to remove lead(II) from aqueous solution. The biosorption process was optimized by response surface methodology (RSM) based on the Box-Behnken design. The relationships between dependent and independent variables were quantitatively determined by second-order polynomial equation and 3D response surface plots. The biosorption mechanism was explored by characterization of the biosorbent before and after biosorption using atomic force microscopy (AFM), scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The results showed that the maximum adsorption capacity of 9.6 mg/g was obtained at the initial lead ion concentration of 108.79 mg/l, pH value of 5.75, and biosorbent dosage of 9.9 g/l (fresh weight), which was close to the theoretically expected value of 9.88 mg/g. Arthrobacter sp. 25 is an ellipsoidalshaped bacterium covered with extracellular polymeric substances. The biosorption mechanism involved physical adsorption and microprecipitation as well as ion exchange, and functional groups such as phosphoryl, hydroxyl, amino, amide, carbonyl, and phosphate groups played vital roles in adsorption. The results indicate that Arthrobacter sp. 25 may be potentially used as a biosorbent for low-concentration lead(II) removal from wastewater.
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Biosorption mechanism of Zn from aqueous solution by spent substrates of pleurotus ostreatus
XiaoJing Hu,JuanJuan Qu,LiLong Yan,Haidong Gu,TingTing Zang,Yu Jin 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11
To solve the problem of heavy metal pollution and agricultural wastes reclamation, spent substrate of pleurotusostreatus (SSPO) was used as adsorbent to remove Zn2+from aqueous solution. The biosorption of zinc ions on SSPOwas studied as a function of the solution pH, temperature and initial Zn2+concentration. The equilibrium sorption datawere well represented by linear Langmuir isotherm models with R2value of 0.9955 and non-linear Freundlich withR2value of 0.9973. The BET surface area of SSPO can reach 51.16 m2g−1. SEM-EDX and XRD revealed that (NH4)2Zn·H2O and Zn2PO4(OH) were the main compounds in metal-loaded SSPO. FTIR analysis indicated the governing func-tional groups such as O-H, N-H and P=O played an important role in biosorption. The desorption studies showed thereversibility of SSPO. The results indicate that SSPO is a potential adsorbent in wastewater treatment due to its greatsorption capacity and low cost.
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