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Zhengfang Ye,Lili Cui,Qingqiang Meng,Haitao Bi,Lincheng Zhou 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
We studied the simultaneous removal of Pb(II) and chemical oxygen demand (COD) from synthetic solutions using immobilized microorganism. The immobilized microorganisms on polyurethane foam (IPUF) were successfully prepared by cultivating the microbe B350 in a mixture of culture medium and polyurethane foam (PUF). The adsorption of Pb(II) ion from aqueous solutions onto PUF and IPUF was studied by batch adsorption. IPUF exhibited high Pb(II) removal efficiency. When 0.12 g of IPUF was used to treat 50mL of 20mg/L P(II) solution at pH 7.0 and 25 oC for 120 mins, the removal ratio was 80%. The biosorption kinetics could be described by the pseudo-secondorder model, and the adsorption isotherms could be described by Langmuir and Freundlich equations. In addition, for synthetic wastewater containing Pb(II) and C6H12O6, the removal ratios of Pb(II) and COD after being treated by IPUF for 8 hours were 92.0% and 84.2%, respectively. The removal ratio of COD clearly decreased with the increase of Pb(II)concentration, meaning that Pb(II) was toxic to the mobilized microorganisms and lower Pb(II) concentration was preferred.
A Facile Approach for the Synthesis of Stable Amorphous Nanoscale Zero-Valent Iron Particles
Shi-Ni Zhu,Guo-hua Liu,Kwan-San Hui,Zhengfang Ye,후이 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
Conventional methods for the preparation and stabilization of amorphous nanoscale zero-valent iron (NZVI) particles are complicated and costly. In this study, a facile and economic approach for synthesizing stable NZVI without the requirement of vacuum condition was explored. NZVI particles were simultaneously prepared and stabilized in non-deoxygenated aqueous solutions. Scanning electron microscopy, energy dispersive xray microanalysis (EDX), and x-ray photoelectron spectroscopy results showed that the as-prepared Fe0 were uniform spherical particles with a diameter ranging from 50 nm to 100 nm and a ~5 nm thick oxide shell. The x-ray diffraction (XRD) patterns indicated that the main component of the particles was amorphous Fe0. As confirmed via EDX and XRD analyses, the Fe0 content in the stabilized NZVI particles was hardly changed after six months of storage in dry atmosphere.