粉末活性炭对β-萘磺酸的吸附性能

通过静态吸附实验,研究了粉末活性炭对β-萘磺酸的吸附性能.结果表明,在298K时,粉末活性炭对β-萘磺酸具有较好的吸附性能,其静态饱和附容量可达到115.48 mg/g.粉末活性炭对β-萘磺酸的吸附等温线符合Langmuir模型,且属优惠型吸附.吸附过程的ΔG<0,ΔH<0,表明此反应过程是放热自发进行的,温度低于298 K时降低温度有利于吸附反应的发生.吸附动力学研究表明,粉末活性炭对β-萘磺酸的吸附过程遵循二级动力学方程.     

活性炭吸附酸性铬蓝 K 的研究简

以小麦秸秆为原料。通过复合物理活化法制备高比表面积活性炭．用所得活性炭为吸附剂,研究了其对酸性铬蓝K的吸附行为,考察了吸附剂用量、pH值、初始浓度、温度与吸附时间对酸性铬蓝K的吸附容量与脱除效果的影响．结果表明。酸性铬蓝K在浓度50g／m^3、pH为2．02、温度320K、吸附剂用量0．1g与吸附时间40min时去除率达到99．9％．     

菱角壳活性炭对富营养化水体中磷的吸附性能研究

本研究采用常压制备的工艺,制备出菱角壳活性炭,对其进行磷吸附动力学及等温线实验的研究。结果表明,吸附过程速率主要由孔隙内扩散控制,准二级反应动力学模型和Langmuir模型分别较好地描述了菱角壳活性炭对磷的吸附过程和菱角壳活性炭对磷吸附等温曲线,菱角壳活性炭对磷饱和吸附量拟合值达26.67 mg/g,能有效吸附富营养化水体中95%以上的磷,吸附能力良好。菱角壳活性炭作为一种易得、廉价、高效的吸附剂,在合理回收和解决富营养水体问题方面具有良好的应用前景。     

化学混凝法处理高色度染料废水的研究

高色度酸性蓝黑10B、酸性橙Ⅱ染料废水经过多次混凝-活性炭吸附组合工艺的处理，其色度和COD的去除率都在99％和96％以上，并对影响脱色的因素及其控制条件进行了试验研究，处理后各项指标均达到国家排放标准。     

煤制活性炭的研制及其吸附特性

研究了以烟煤为原料制备颗粒活性炭的工艺过程 ,讨论了原煤炭、活化温度、活化时间、活性炭收率等工艺条件对活性炭吸附性能的影响。实验结果表明 ,煤制活性炭的最佳工艺条件 :粒度 180目 ,筛余量小于3% ,粘结剂用量为原料粉的 30 % ,炭化温度 5 6 0℃ - 6 0 0℃ ,合适活化温度 85 0℃ - 90 0℃。文章还讨论了煤制活性炭去除水污染物的效能及机理     

Pb(Ⅱ)在改性龙眼壳活性炭上的吸附行为及机理研究

以甲醛/硫酸为改性剂,对龙眼壳活性炭进行改性制备吸附剂(LCSF),并用LCSF对模拟废水中的Pb(Ⅱ)进行吸附,考察了Pb(Ⅱ)初始质量浓度、p H值、吸附时间、吸附温度对铅吸附量的影响.结果表明LCSF提高了对Pb(Ⅱ)的吸附性能,最佳工艺条件为:荔枝壳活性炭用量0. 05 g、铅初始浓度为120 mg/L、p H=5、吸附时间45 min、吸附温度298 K,在此工艺条件下,改性龙眼壳活性炭对Pb(Ⅱ)的吸附量可达229. 72 mg/g.该吸附过程符合准二级吸附动力学模型,其热力学参数△G <0、△H> 0、△S> 0,说明该吸附是自发的吸热吸附过程.     

改性活性炭在苯酚废水处理中的应用

水体的有机污染随着我国工业化的发展在不断的加剧,对有机污染物采取有效的去除措施一直是污水处理的难点和热点问题,苯酚废水的处理就是其中之一。活性炭在对有机污染物的去除方面应用较多,但也常常存在吸附率低下等问题。而通过对活性炭的改性可以在一定程度上改变其表面围观结构,增强其吸附性能。本文通过对活性炭改性方法的研究,总结了酸性改性、碱性改性、金属离子改性以及Fenton改性活性炭的研究方法,为研究苯酚废水的处理提供了帮助。     

磺基水杨酸和3,5-二硝基水杨酸在活性炭上吸附行为的研究

煤质活性炭用过二硫酸铵氧化处理后,采用N2吸附、酸碱滴定及零电荷点(pHPZC)对活性发表面性质及孔结构进行表征.测定了磺基水杨酸和3,5-二硝基水杨酸在氧化前后活性炭上的吸附等温线,用Langmuir和Freundlich吸附等温方程对数据进行拟合,计算了吸附过程的热力学参数.3,5-二硝基水杨酸在两种活性炭上的△Sθ与△Hθ均是正值,吸附过程是吸热过程,属于熵驱动型吸附;而磺基水杨酸在氧化后的活性炭上的△Sθ与△Hθ均为负值,吸附过程是放热过程,属于焓驱动型.在-SO3H的催化作用下,磺基水杨酸的-OH/-COOH与吸附剂表面的-COOH/-OH可能发生酯化反应而引起化学吸附.     

ZnCl_2活化笋壳活性炭制备及吸附动力学分析

以笋壳为原料,采用氯化锌为活化剂制备活性炭,通过正交实验研究各影响因素对活性炭性能的影响。通过静态吸附实验研究ZnCl_2活化笋壳活性炭对亚甲基蓝的吸附特性,并从动力学角度探讨其吸附机理。结果表明,制备活性炭主要影响因素为活化温度,其次是ZnCl_2浓度,活化时间影响最小。制备活性炭的最佳条件是:ZnCl_2浓度为3 mol/L,活化温度控制在400℃,活化时间2 h。活性炭对亚甲基蓝的吸附符合准二级动力学方程和Elovich方程,吸附速率控制步骤主要为膜扩散控制。等温吸附曲线与Langmuir型和Freundlich型均拟合较好,吸附过程是优惠吸附。     

改性生物质活性炭对水溶液中Cu2+的吸附研究

研究以玉米秸秆为原料制备生物质活性炭,并分别进行NaOH和HNO₃改性。考察三种生物质活性炭的用量和粒径、水溶液pH值和吸附时间对水溶液中Cu²⁺吸附性能的影响,并对其等温吸附特征、吸附动力学和吸附热力学进行研究。结果表明:当0.15~0.30mm的生物质活性炭投加量为0.30g,pH值为6.0时,对溶液中Cu²⁺具有很好的去除率,在360min时达到吸附平衡;吸附过程符合Langmuir和Freundlich模型以及准二级动力学方程,且热力学参数ΔG⁰＜0,ΔH⁰和ΔS⁰＞0,为自发的、吸热的和熵增的过程,对水溶液中Cu²⁺均具有较好的亲和力;相同条件下,三种生物质活性炭对Cu²⁺的吸附效果表现为:NaOH改性＞HNO₃改性＞未改性。     

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!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.