酿酒酵母吸附Zn2+的特性及其动力学研究

为利用啤酒酵母生物吸附去除重金属离子,以酿酒酵母为例,研究了无缓冲溶液体系对Zn离子的吸附特性和动力学。结果表明,当Zn2 的初始浓度是5.23~52.32 m g.L-1,酵母浓度约1.0 g.L-1时,初始pH值约5.6,反应38 h时,酵母对Zn2 吸附量为2.57~42.82 m g.g-1,去除率达到76.4%~92.8%,pH值升高0.55~1.28。酵母吸附Zn2 的动力学过程复杂,高浓度条件下脱附现象严重,仅部分反应时段符合准二级动力学方程。Zn2 初始浓度越高,准二级速率方程的常数越低,初始反应速率越快。酿酒酵母可以用于吸附除去水体中的Zn离子。     

红树林内源真菌Fusarium sp.#ZZF51吸附Cu2+的研究

采用生物吸附法去除废水中Cu2+,研究了南海红树林内源真菌Fusarium sp.#ZZF51吸附Cu2+的行为特性、吸附模型及吸附机理。结果表明:受试菌吸附Cu2+的吸附平衡时间为90 min,常温常压下吸附最佳pH值为6.5,Cu2+初始浓度50 mg/L,吸附时间90 min,此时受试菌对Cu2+的吸附率和吸附容量分别为82.14%和20.53 mg/g。Langmuir方程比Freundlich方程能更好地描述该受试菌对Cu2+的平衡吸附行为。通过比较受试菌吸附Cu2+前后红外光谱图得知,在吸附过程中,羟基和羰基都起着十分重要的作用。     

纳米羟基磷灰石对Cu2+的吸附

用溶胶-凝胶法制备纳米羟基磷灰石(n-HAP)吸附水溶液中的铜离子(Cu2+),研究反应时间、体系pH值和Cu2+初始浓度等因素对吸附行为的影响,并探讨吸附机理。结果表明:在溶液pH=4.5~7.5,n-HAP对Cu2+的吸附升高趋势近似线性关系;反应60 min时基本达到吸附平衡;pH>7.5时,溶液中Cu2+几乎完全去除,最大吸附量为51.28 mg/g。n-HAP对Cu2+有良好的吸附作用,吸附类型为Langmu ir等温吸附,吸附过程符合拟二级反应动力学方程。     

正交方法研究改性啤酒酵母吸附处理含镉废水

将废啤酒酵母制成一种新型的生物吸附剂,通过正交方法研究不同温度、时间、pH值,以及不同初始Cd2+浓度和废啤酒酵母浓度条件下,废酵母对Cd2+的吸附能力.结果表明吸附温度为25℃,吸附时间为60 min,pH5,废酵母的浓度为2 g·L-1,初始Cd2+浓度为40 mg·L-1的条件下,废啤酒酵母对Cd2+吸附率可达92%.     

污泥灰去除模拟废水中Cu~(2+)的吸附研究

以城市污水处理厂污泥为原料热解制得污泥灰,对吸附模拟废水中Cu2+离子的反应条件进行研究,考察了反应时间、溶液pH值、污泥灰投加量、初始浓度、温度、离子强度等因素,对探讨污泥灰去除废水中Cu2+可行性提供科学依据.     

啤酒酵母废菌吸附处理含铜废水的实验研究

用啤酒酵母废菌吸附水溶液中Cu2+,研究了不同时间、pH值,以及Cu2+浓度和酵母菌浓度条件下,啤酒酵母对Cu2+ 的吸附能力.初步确定了啤酒酵母对Cu2+吸附的最佳组合,即吸附温度为25℃,吸附时间为60 min,起始pH值为5,啤酒酵母的质量浓度为2 g·L-1,Cu2+初始质量浓度为35 mg·L-1,在此条件下啤酒酵母对Cu2+吸附率可达90%,吸附等温曲线符合Langmuir模式.该工艺简单,以废治废,成本低廉,具有良好的应用前景.     

天然高岭土对Pb~(2+),Cd~(2+),Ni~(2+),Cu~(2+)的吸附及解吸性能研究

探讨了吸附时间、溶液pH、重金属离子初始质量浓度、离子强度以及竞争吸附等因素对天然高岭土吸附水中Pb2+,Cd2+,Ni2+,Cu2+等重金属离子的影响.结果表明,pH、初始质量浓度、离子强度以及共存离子,是影响高岭土吸附重金属离子的主要因素;高岭土对Pb2+的吸附性能明显优于其它3种重金属离子,顺序为:Pb2+＞Cd2+＞Ni2+＞Cu2+;吸附等温线均符合Freundlich型等温方程,说明高岭土对这几种离子都是典型的单分子层吸附;Pb2+,Cd2+,Ni2+,Cu2+离子解吸量大小顺序为:Pb2+＜Ni2+＜Cu2+＜Cd2+.     

改性生物质材料对模拟废水中Cu离子吸附研究

采用改性生物质吸附材料,对去除模拟废水中重金属Cu离子的吸附影响因素展开研究.通过单因素和正交试验,对影响吸附效果的生物质材料花生壳投加量、反应体系pH、反应时间、反应温度等变量进行了考察.结果显示,在Cu离子初始浓度50mg/L、反应体系pH4、反应温度20℃、反应时间120min、花生壳投放量0.8g/100mL时,对Cu离子吸附效果最好,吸附率可达90.63%;各因素对吸附模拟废水中重金属Cu离子的影响顺序为pH反应温度反应时间投加量.研究表明,花生壳对模拟废水中重金属Cu离子具有良好的去除作用,但其实际应用有待于进一步探讨.     

山核桃壳对低温水环境中铜离子的吸附效果

为了研究利用山核桃壳作为生物吸附剂去除水溶液中的Cu(Ⅱ)离子,探讨了不同条件溶液pH、吸附时间、Cu(Ⅱ)初始质量浓度对吸附效率的影响。实验结果表明:山核桃壳对Cu(Ⅱ)离子吸附率在pH为5.0的时候为可达到最大90.44%;随着初始Cu(Ⅱ)质量浓度的增加吸附率逐渐减小;FTIR显示山核桃壳的一些化学基团与吸附Cu(Ⅱ)离子有关;山核桃壳对Cu(Ⅱ)离子的吸附过程与Langmuir和Freundlich吸附等温线相关性较高。山核桃壳是一种很有前景去除水中Cu(Ⅱ)离子的生物吸附剂。     

腐殖土对废水中Cu2+的吸附

研究了腐殖土对废水中Cu2+的吸附,并考察了吸附时间、Cu2+的初始浓度、腐殖土投加量、初始pH值和温度等因素对吸附过程的影响.通过吸附动力学、吸附等温线和红外光谱(FTIR)等方法探讨了吸附机理.试验条件下,单位腐殖土对Cu2+的吸附量随时间的延长而增加直至达到吸附平衡,随Cu2+的初始浓度增大和初始pH值的上升而增加,随腐殖土投加量的增加而减少,吸附过程温度的影响不显著.腐殖土吸附Cu2+的过程符合Lagergren准二级吸附速率方程和Freundlieh吸附等温方程,吸附过程以化学吸附为主,红外光谱分析表明,参与吸附的主要基团是羟基和芳香基等化学基团.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that