废水中Co(Ⅱ)、Fe(Ⅲ)、Mn(Ⅱ)离子共存体系分离方法的研究

随着工业的迅速发展,含重金属的废水排放量也在增加,造成环境污染。用共沉淀分离法和配位分离法除去废水中含有Co(Ⅱ)、Fe(Ⅲ)、Mn(Ⅱ)离子,在保护环境的同时也回收了贵重金属钴。     

有机废水发酵产氢在实验教学中的探索

通过有机废水发酵产氢教改实验项目的探索与研究,自行设计、开发了暗-光发酵耦合产氢反应器,利用污水处理厂的剩余污泥以及实际环境中的有机废水发酵产氢,将有机废水进行资源化利用。通过本教改实验项目的实施,以"产氢菌的纯种分离与培养"为内容,在环境微生物学实验中开展产氢实验教学的探索与研究,促进了学生对有机废水资源化的认识与理解,激发了学生的学习兴趣,增强了学生的主观能动性,促进了学生分析问题、解决问题的实践能力和创新能力的培养和提高。     

水体中钴、镍的快速检测技术研究

提出了一种适用于快速大批量检测水质中钴、镍的方法,通过实验建立了水中钴、镍的快速光度测定方法.方法以1-(2-吡啶偶氮)-2-萘酚(PAN)为显色剂,确定了同时测定钴镍的最佳实验条件,钴配合物的测定波长为580 nm、518 nm,镍配合物的测定为波长为570 nm、592 nm.在最佳的实验条件下,钴、镍的检出限均为0.01 μg/mL;平均回收率为91.6%～102.0%;相对标准偏差均小于5%.样品测定值与ICP-AES法相比,无显著性差异.实验结果表明该方法操作简便,所需成本低,灵敏度高,结果令人满意.     

含镉、铅、汞废水的吸附实验设计

设计了一个探索性实验—巯基棉处理含镉、铅、汞废水。介绍了实验原理和实验方法     

凤眼莲对铜、铅、镉、锌、铁等离子的短期净化机制研究

采用火焰原子吸收分光光度法测定了凤眼莲对Cu2+、Pb2+、Cd2+、Zn2+、Fe3+等离子的短期个别去除速率、复合去除速率及凤眼莲根茎叶的富集量,结合耐受性实验,对其富集机制进行了探讨。凤眼莲的累积去除率,头两天为Pb>Cu>Zn≈Cd>Fe,以后为Pb≈Fe>Cu>Zn>Cd;耐受性则大致为:Zn>Cd>Fe>Pb>Cu。表明凤眼莲在快速高效去除低浓度含铅废水、治理含镉废水和作为铜污染废水的指示性植物等方面有良好的应用前景。     

高级氧化实验平台构建与实验设计

以河南科技大学环境工程专业为例,对高级氧化实验平台的建设进行了简要介绍,并以"UV/TiO2降解活性红废水实验"为例,对该装置以及实验的设计运行情况进行说明。该实验平台的建设与运行,对于实现学生从书本知识到设计、实施的衔接,以及培养创新意识有积极的作用。     

“钾离子焰色反应”实验的改进

在进行钾盐焰色反应实验的时候,一般都采用可吸收黄光的蓝色钴玻璃隔着火焰进行观察。根据实验分析在实验中缺少蓝色钴玻璃时,可试用1％的铜氨溶液来代替。 一、实验原理:根据实验测得的铜氨溶液     

合成单位点钴基催化剂Co-NG实验

设计了基于简单的焙烧法"合成单位点钴基催化剂(Co-NG)实验",利用电化学工作站、红外光谱、透射电子显微镜、扫描透射电子显微镜以及球差电子显微镜等方法进行性能评价及表征,并研究了Co-NG催化剂在氧还原反应上的应用。结果表明,在氨气气氛下700℃焙烧后获得的钴高度分散在氮掺杂的石墨烯上,该材料在碱性锌-空气燃料电池的氧还原反应中性能最优。该实验提高了学生对碱性燃料电池的深度理解,又加强了学生在实验中的创新能力,进而提高了学生的科研能力。     

钴填充碳纳米管的微波吸收性能研究

分析了钴填充碳纳米管的磁性能,深入探讨了钴填充碳纳米管的微波吸收机理,对钴纳米粒子填充碳纳米管的微波吸收特性进行了数值模拟,计算了其自然共振频率,理论结果与实验数据相吻合.研究结果表明:钴填充碳纳米管对微波的强烈吸收主要是样品中钴纳米粒子在微波作用下产生了磁共振的结果;随着钴填充碳纳米管薄膜厚度的增加,其共振频率向低频方向移动,随着碳纳米管中钴纳米粒子含量的增加,其共振频率向高频方向移动.因此通过改变样品厚度和调节碳管中钴纳米粒子含量,可以实现对特定频段微波的强吸收.     

利用工业废物制备复合无机絮凝剂处理废水的研究

以钛白粉厂副产物为原料制备高效复合絮凝剂聚合氯硫酸铁(PFSC),对其进行了废水处理实验,考查了废水的pH值、絮凝剂用量、沉降时间等对絮凝性能的影响,确定了PFSC絮凝剂处理废水的最佳条件.对比实验结果表明:PFSC的絮凝效果和絮凝沉降性能均比PFS和PAC好,处理废水的效果更佳.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.