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    题名 作者 年代 出处 被引量
1漆酶催化氧化废水中17α-乙炔基雌二醇显示文摘用漆酶催化氧化法处理废水中的17α-乙炔基雌二醇(简称EE2)。考察了温度、pH值、起始底物浓度、起始漆酶浓度和助催化剂等因素对EE2去除率的影响。实验结果表明漆酶能有效催化氧化废水中的EE2,适宜的反应条件为:温度35℃,pH值5.38,漆酶与EE2起始浓度之比宜大于0.178 U/μmol,反应180 min,EE2的去除率大于92%。其他反应条件一定,EE2起始浓度在0.017 1-0.051 3mmol/L之间,EE2去除率随其浓度升高而缓慢下降,但去除量逐渐升高;EE2起始浓度在0.051 3~0.137 6 mmol/L之间,EE2的去除率和去除量都显著降低。磁力搅拌和助催化剂ABTS都能显著加快反应速度,提高EE2去除率。李洪枚 2017环境科学与技术2017,40,1:4
2A novel-green adsorbent based on betaine-modified magnetic nanoparticles for removal of methyl blue显示文摘A potential adsorbent based on betaine-modified magnetic iron oxide nanoparticles(BMNPs) was successfully synthesized by facile method, characterized and applied for methyl blue(MB) removal from aqueous solution. The characterization results of FTIR, transmission electron microscopy(TEM), X-ray diffraction(XRD) and vibrating sample magnetometer(VSM) showed that the prepared nanoparticles could be well dispersed in water and exhibited excellent superparamagnetism. These properties imply the potential to recycle BMNPs from wastewater through magnetic field. In the adsorption process, the effects of main experimental parameters such as p H of MB solution, initial concentration of MB, contact time, and adsorption capacity for MB were studied and optimized. These results demonstrated that large amounts of quaternary ammonium groups existing on the surface of BMNPs could promote absorption of MB via electrostatic forces. Additionally, the adsorption kinetics of MB was found to follow a pseudosecond-order kinetic model and the adsorption equilibrium data fitted very closely to the Langmuir adsorption isotherm model. The maximum adsorption capacity for MB was calculated to be 136 mg g 1at room temperature. Moreover, the BMNPs showed good reusability with 73.33% MB adsorption in the5 th cycle.Haowei Wang Shangning Jia Haojiang Wang Bo Li Wen Liu Ningbo Li Jie Qiao Chen-Zhong Li 2017Science Bulletin2017,62,5:3
3Cagelike mesoporous silica encapsulated with microcapsules for immobilized laccase and 2,4-DCP degradation显示文摘In this study,cage-like mesoporous silica was used as the carrier to immobilize laccase by a physical approach,followed by encapsulating with chitosan/alginate microcapsule membranes to form microcapsules of immobilized laccase based on layer-by-layer technology.The relationship between laccase activity recovery/leakage rate and the coating thickness was simultaneously investigated.Because the microcapsule layers have a substantial network of pores,they act as semipermeable membranes,while the laccase immobilized inside the microcapsules acts as a processing plant for degradation of2,4-dichlorophenol.The microcapsules of immobilized laccase were able to degrade 2,4-dichlorophenol within a wide range of 2,4-dichlorophenol concentration,temperature and p H,with mean degradation rate around 62%.Under the optimal conditions,the thermal stability and reusability of immobilized laccase were shown to be improved significantly,as the removal rate and degradation rate remained over 40.2% and 33.8% respectively after 6 cycles of operation.Using mass spectrometry(MS) and nuclear magnetic resonance(NMR),diisobutyl phthalate and dibutyl phthalate were identified as the products of 2,4-dichlorophenol degradation by the microcapsules of immobilized laccase and laccase immobilized by a physical approach,respectively,further demonstrating the degradation mechanism of 2,4-dichlorophenol by microcapsule-immobilized laccase.Junya Yang Yan Huang Yuxiang Yang Hongming Yuan Xiangnong Liu 2015Journal of Environmental Sciences2015,27,12:2
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