以市政污水为底物的微藻油脂积累和碳流分析

微藻培养的高成本阻碍了微藻生物柴油的工业化推广。文章以市政污水作为Chlorella vulgaris的培养基,分别在水力停留时间(HRT)24,48,96 h和间歇运行时对其进行培养。随着HRT的增加,C.vulgaris在系统生物群落中所占的比例增大,而且细胞密度和脂含量也分别由HRT 24 h时的0.088 g/L和8.4%提高到间歇时的0.164 g/L和14.3%。HRT对废水处理效果的影响较小,不同HRT时,COD和TP的去除率分别在66.1%~71.1%和37.6%~51.1%,TN的去除率则仅为5.9%~11.2%。对间歇污水处理过程碳元素流动分析表明,污水中的71.1%有机碳被微藻利用,其中94.6%被转化为微藻生物质,其余被代谢为CO2释放,废水中有机碳(COD)转化为微藻油脂的转化率为11.6 mg/(mg.L)。     

Effects of nano-SiO2 on reinforcing and toughening polypropylene

SiO2 nano particle, through surface modification by silicane coupling agent KH-570, was successfully applied to make nano SiO2/PP composite material by the melt-out blending process with twin-screw extruder. Effects of nano SiO2on the reinforcing and toughening of PP were studied by analyzing the material impact broken fracture, the crystal structure and the diameter of SiO2 nano particle using SEM, XRD and TEM, respec-tively. Results showed that the impact strength and the tensile strength of nano SiO2/PP composite material were improved apparently; the impact strength of PP was fracture was increased to 67% when the nano SiO2 content was 4% ; while the nano SiO2 particle upon surface treatment will impose obvious heterogeneous nucleation function over PP crystal.     

Preparation of ZAO powder and investigation on its infrared emissivity

According to the basic infrared stealth mechanism of low infrared emissivity powders,the ZAO powder materials were prepared by liquid coprecipitation method,and the starting materials were Zn( NO3) 6H2O and Al( NO3) 39H2O. The process parameters were obtained,and the relationship between technology parameters and infrared emissivity was investigated. The temperature of thermal treatment,crystal structure and surface micrograph of ZAO powder was analyzed by the help of TG-DTA,XRD and SEM. The infrared stealth performance of ZAO powder was studied by IR-2 emissivity spectroscopy. Results showed that the infrared emissivity was the lowest when pH was 8. 0,calcination temperature was 1100 ℃,calcination time was 2 h,and the Al2O3doping content was 3% ( mass percentage) . The crystal structure of doped ZAO powder was lead-zinc, and there exists distortion of crystal lattice in nanocrystalline ZnO. The average particle size was 10 μm. The lowest infrared emissivity reached to 0. 61 at between 8 μm and 14 μm. It means that the ZAO powders will be excellent infrared stealthy materials.     

降解未处理纤维素厌氧混合菌群的筛选及功能

为获得高效稳定的原木质纤维素降解微生物,利用限制性培养手段,从瘤胃残渣中筛选出了可以体外培养、分解能力强且性能稳定的纤维素厌氧降解菌群FYG-2.该菌群在38.5 ℃,pH6.4～6.8条件下,5 d内可以使1.00 g滤纸完全崩解.转接30代,其降解性能仍保持稳定,且纤维素底物的灭菌与否均不影响其分解.以底物失重率、...     

Research on a New Type of Anti-radiation Polymeric Material

ＲｅｓｅａｒｃｈｏｎａＮｅｗＴｙｐｅｏｆＡｎｔｉ－ｒａｄｉａｔｉｏｎＰｏｌｙｍｅｒｉｃＭａｔｅｒｉａｌＣＡＩＷｅｉｍｉｎ；ＦＥＮＧＹｕｊｉｅ；ＷＡＮＧＸｉａｏｈｏｎｇ；ＬＩＺｉｚｈｉ；ＧＵＢｉｎ蔡伟民，冯玉杰，王晓红，李子秩，顾滨（Ｄｅｐｔ．ｏｆＡｐ...     

CeO2对RuO2/γ-Al2O3催化剂湿式氧化降解苯酚性能的影响

采用浸渍法制备了RuO2/γ-Al2O3和RuO2/CeO2/γ-Al2O3催化剂,并利用XRD、sEM和XPS对催化剂进行了表征,研究了Ce的加人对RuO2/γ-Al2O3催化剂表面分散性和催化剂表面元素Ru,O和Ce化学态的影响,同时考察了RuO2/γ-Al2O3和RuO2/CeO2/γ-Al2O3催化剂湿式氧化降解苯酚的活性,并深入探讨了Ce对RuO2/γ-Al2O3催化剂的助催化作用.结果表明:Ce掺杂改性后,使催化剂表面Ru的化学态降低、表面氧空位增加,并且活性组分Ru的分散性增加,从而使RuO2/CeO2/γ-Al2O3催化剂的活性提高,因此Ce起到了显著的助催化作用.     

乳液聚合制备聚苯乙烯纳米微球

采用乳液聚合法制备了聚苯乙烯(PS)微球,对制备条件进行了研究.采用FT-IR、TEM对PS粒子的表面结构进行了表征.电镜分析表明,PS微球平均粒径约为50nm,且随乳化剂浓度的增加而减小.实验结果表明,聚合温度、乳化剂浓度等对PS微球大小和尺寸分布产生较大影响.     

电化学废水处理技术及高效电催化电极的研究与进展

为解决电化学水处理技术中提高电催化效率和延长电极寿命的问题,在综合以上两方面国内外的研究成果及解决途径的基础上,指出DSA电极因其高的稳定性,且可通过设计制备一定结构的表面涂层而获得具有不同结构的阳极材料;DSA电极用于有机物氧化降解存在直接和间接电化学氧化两种过程,而涂层表面结构中氧空位浓度与电极性质密切相关．     

Effect of pH and temperature on acidogenic and hydrogenic activities of glucose-degrading bio-granules

0　ＩＮＴＲＯＤＵＣＴＩＯＮＡｓｉｔｂｅｃｏｍｅｓｉｎｃｒｅａｓｉｎｇｌｙｃｌｅａｒｔｈａｔｔｈｏｓｅｃｏｎｖｅ ｎｉｅｎｔｅｎｅｒｇｙｓｏｕｒｃｅｓ ,ｓｕｃｈａｓｏｉｌａｎｄｇａｓ,ｃａｎｎｏｔｓｕｐ ｐｏｒｔｔｈｅｗｏｒｌｄｆｏｒｅｖｅｒ .Ｍａｎｈａｓｂｅｇｕｎｔｏｔｕｒｎｔｏｆｉｎｄｔｈｅａｌｔｅｒｎａｔｉｖｅｓ[1] .Ｗｉｔｈｔｈｅｇｒｏｗｉｎｇｃｏｎｃｅｒｎｓｏｎｔｈｅｇｒｅｅｎｈｏｕｓｅｅｆｆｅｃｔｉｎ 1990ｓ ,ｈｙｄｒｏｇｅｎｈａｓｂｅｅｎｒｅｃｏｇ ｎｉｚｅｄａｓａｎｉｍｐｏｒｔａｎｔｆ…     

松花江流域萘的多介质环境迁移与归趋模拟

为研究多环芳烃(PAHs)——萘在松花江流域多介质中的迁移及归趋,利用Level III多介质逸度模型模拟计算了稳态假设条件下萘在松花江环境相间的迁移和含量分布．结果表明:土壤是萘的最大储库,占总滞留量的40％;在大气、水、土壤、沉积物中,萘的含量分别为3.58×10-6 μg·g-1、0.142 μg·L-1、5.28×10-4 μg·g-1、3.62×10-3 μg·g-1．模型计算含量与同期实测含量吻合较好,验证了模型的可靠性．