TAS-986型石墨炉原子吸收光谱法测定绿茶中微量硒

利用加入基体改进剂NiNO3,采用TAS-986型石墨炉原子吸收光谱法对绿茶中微量硒的分析.RSD＜5.0%,回收率在99.0%～100.2%之间,该法简便、快速,测定结果准确可靠.     

石墨相氮化碳光催化灭活水中多重耐药菌研究

研究了光辐照和基于石墨相氮化碳（g-C₃N₄）光催化对二级出水中1株四环素和氨苄西林抗性多重耐药菌E.coli CGMCC 1.1595的灭活效果.结果表明,汞灯辐照功率（100/300/500W）和辐照强度越高,其灭活效率相对越高,在500W汞灯60min辐照条件下,紫外长波（UVA）-可见光（300~579nm）对该多重耐药菌的灭活率为0.41log;基于g-C₃N₄的光催化对其灭活率为1.31log.相比未加g-C₃N₄催化剂的光辐照灭菌,在UVA-可见光条件下g-C₃N₄对其灭活率的贡献为61%~69%;在可见光条件下g-C₃N₄对其灭活率的贡献达到60%~79%.在UVA-可见光g-C₃N₄光催化灭活E.coli CGMCC 1.1595反应体系中,活性氧自由基和电子空穴的活跃程度为：·OH > ·O₂^- > H₂O₂ > h⁺ > ¹O₂,·OH为该光催化体系的主要活性物质,其次是·O₂^-和H₂O₂.     

氢化物原子荧光法与石墨炉原子吸收法测定水中镉的比较研究

分别采用氢化物原子荧光法和石墨炉原子吸收法测定水中痕量镉的含量,在选定的最佳条件下,比较两种方法测定镉元素的优劣。实验结果表明,两种方法都具有较高的准确度和精密度,无显著性差异。     

Startup and operation of anaerobic EGSB reactor treating palm oil mill effluent

A bench-scale expanded granular sludge bed (EGSB) reactor was applied to the treatment of palm oil mill ettluent (POME).The reactor had been operated continuously at 35℃ for 514 d,with organic loading rate (OLR) increased from 1.45 to 17.5 kg COD/(m3·d).The results showed that the EGSB reactor had good performance in terms of COD removal on the one hand,high COD removal of 91% Was obtained at two days’ of hydraulic retention time (HRT),and the highest OLR of 17.5 kg COD/(m3·d).On the other hand,only 46% COD in raw POME Was transformed into biogas in which the methane content was about 70% (v/v).A 30-d intermittent experiment indicated that the maximum transformation potential of organic matter in raw POME into methane Was 56%.Volatile fatty acid (VFA) accumulation was observed in the later operation stage,and this Was settled by supplementing trace metal elements.On the whole,the system exhibited good stability in terms of acidity and alkalinity.Finally, the operational problems inherent in the laboratory scale experiment and the corresponding countermeasures were also discussed.     

浸渍法提高石墨安全性能的研究*

为提高石墨电极的安全性能,采用浸渍法讨论不同活性组分负载的石墨样品在750 ℃环境下的抗氧化性能及影响机制。通过一系列单一活性组分筛选实验和复合活性组分筛选实验讨论活性组分对单位面积质量损失的影响,验证组分优选的可靠性;通过浓度变量实验,得到复合组分浸渍液的优化配比。根据石墨的微观结构和元素组分变化,提出活性组分抗氧化作用机理。结果表明:活性组分与石墨在高温作用下形成的络合物层能够有效延长石墨电极的使用寿命,提高生产安全水平。     

浅议石墨炉原子吸收法测定水中的四乙基铅

用三氯甲烷萃取水中的四乙基铅,直接在石墨炉原子吸收仪上进行测定。结果表明：本方法的相对标准偏差为5．9％,平均回收率在90．4％～108％之间,检出限为1．3×10^-5mg／L,准确度高,精密度好。     

城市空间扩展的生态环境对策--以苏州西部地区为例

苏州市"一体两翼,东园西区、古城居中"的总体格局以及周边地区"四角山水"的生态屏障,是苏州城市发展空间生态优化、整合的重要特色。针对苏州市新一轮发展将城市空间西扩至沿太湖地区,建设现代化的湖滨新城导致景观破碎,生态"绿肺"功能受损及太湖水源保护的胁迫,提出控制污染、保护生态、维护"四角山水"整体性、引导空间有序扩展、产业生态化及法规约束的相关措施。     

Removal of basic fuchsin dye from aqueous solutions using graphite oxide modified aromatic polyurethane foam material

Graphite oxide modified polyurethane foam (GO/PUF) was used for adsorption of basic fuchsin from aqueous solution and adsorption conditions were optimized to attain an efficiency of 99.5%. The adsorption isotherm was in agreement with the Langmuir model. Kinetic study followed pseudo-second order. Determination of Gibbs free energy and enthalpy change of adsorption indicated spontaneous and endothermic adsorption behavior, suggesting that the adsorbent had a potential for the removal of dyes from industrial wastewater.     

EGSB反应器中颗粒污泥床工作状况及污泥性质研究

研究了处理低浓度有机废水的EGSB反应器中颗粒污泥床状况及颗粒污泥的性质,结果表明,液体表面上升流速(V_up)是影响EGSB反应器效能的重要参数,当进水COD为600～800mg/L时,较佳的液体表面上升流速(V_up)为1.5～4.5m/h,在此条件下,EGSB反应器COD负荷为24.5～25.7kg/(m3·d),COD去除率大于85%;同时还发现,经过一定时间的运行后,反应器中颗粒污泥粒径分布、沉降速度、胞外聚合物(ECP)等性质都发生了明显变化,颗粒污泥的平均粒径由0.85mm增加到1.78mm,平均沉降速度由41.2m/h提高到83.2m/h,而胞外聚合物(ECP)的含量则由接种污泥的32.5mg/g增加到57.8mg/g。      

g-C3N4/Cu2O/CF电极制备及在微生物燃料电池中的应用

为了提高微生物燃料电池的产电性能,采用电沉积法将石墨态氮化碳(g-C_3N_4)与氧化亚铜(Cu_2O)负载到碳毡(Carbon felt,CF)表面,制得g-C_3N_4/Cu_2O/CF光电极用于构建微生物燃料电池.通过场发射扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FT-IR)、光生电流曲线(I-T)、线性扫描伏安曲线(LSV)对光电阴极进行光电性能测试,并在白光发光二极管(LED)辐照下研究了以Cu_2O/CF、g-C_3N_4/Cu_2O/CF为阴极光催化微生物燃料电池的产电性能.结果表明,g-C_3N_4/Cu_2O/CF电极中g-C_3N_4分布在Cu_2O之间;g-C_3N_4/Cu_2O/CF光电极能提高光利用率,与Cu_2O/CF光电极相比,光电流密度达到2700 mA·m~(-2),增长幅度达到125%;与Cu_2O/CF阴极微生物燃料电池相比,g-C_3N_4/Cu_2O/CF阴极微生物燃料电池具有更优的产电能力,在白光LED辐照下最大功率密度和光电流密度达到110.7 mW·m~(-2)和1102 mA·m~(-2),增长幅度达到16%和27%.