碳掺杂TiO2光催化剂的制备及其性能表征

在室温下,以钛酸丁酯为钛源、葡萄糖为碳源,用醇解法制备了C掺杂TiO2.以活性艳红X-3B作为目标降解物,评价了不同焙烧温度、投加量和反应液初始pH值等因素对样品光催化性能的影响.利用紫外-可见漫反射(UV-Vis DRS)、X-射线粉末衍射(XRD)、热重分析(TG-DTG)、扫描电镜(SEM-EDS)等手段对样品进行理化性能表征.结果表明,C-TiO2具有典型的锐钛矿相结构,对活性艳红X-3B具有良好的可见光降解效果.在催化剂煅烧温度500℃、投加量1.5 g.L-1、pH值7~9、可见光光照2 h的条件下,对质量浓度为100 mg.L-1的活性艳红X-3B的脱色率可达70%以上.     

CeO_2纳米球的制备及其降解甲基橙反应性能

以Ce(NO3)3·6H2O为铈源,采用水热合成法制备了Ce O2纳米球催化剂,利用N2吸附-脱附、X射线粉末衍射、扫描电镜等技术对其进行了表征,并以甲基橙(MO)为模拟污染物评价了Ce O2纳米球的光催化性能,探讨了催化剂加入量、甲基橙初始浓度、p H值、H2O2的添加对Ce O2纳米球光催化性能的影响。结果表明,采用水热合成法制备了Ce O2纳米球光催化活性高于尿素共沉淀法制备的Ce O2纳米粒子;当甲基橙的初始浓度为10 mg/L,催化剂用量为1 g/L,p H值6.2,光照3 h后,甲基橙降解率为75%。     

类光-芬顿体系PW_(11)O_(39)Fe(Ⅲ)(H_2O)~(4-)/H_2O_2可见光催化降解罗丹明B

以Keggin型铁取代杂多阴离子PW11O39Fe(Ⅲ)(H_2O)4-(PW11Fe)为可见光活性组分构建了一个类光-芬顿体系(PW11Fe/H2O2),并用于模型污染物罗丹明B(Rh B)的可见光催化降解,同时考察了H2O2浓度、PW11Fe浓度、Rh B初始浓度及溶液p H值对Rh B可见光催化降解速率的影响,讨论了Rh B光催化降解的动力学性质。实验结果表明,当溶液p H=4.5时,由0.6 mmol·L-1PW11Fe和4 mmol·L-1H2O2构成的体系对Rh B的光催化降解效果最佳,0.01 mmol·L-1的Rh B在250 W金卤灯照射下反应60 min,其降解率达到100%,反应240 min,总有机碳(TOC)去除率约48%。羟基自由基猝灭和电子顺磁共振(EPR)实验表明,PW11Fe/H2O2体系在可见光照射下产生羟基自由基,从而导致Rh B的快速降解,降解反应的表观速率常数k为(6.2±2)×10-2mmol·L-1·min-1。     

硫掺杂TiO2光催化处理模拟废水Cr( VI)和2-萘酚

采用自制的S/Ti O2作为光催化剂,在可见光下进行光催化降解2-萘酚和还原Cr(VI)的实验。考察了S/Ti O2投加量、2-萘酚初始浓度和p H值对2-萘酚降解光催化性能的影响及Cr(VI)~2-萘酚混合体系光催化反应的研究。结果表明:S/Ti O2投加量为2.0 g/L,2-萘酚溶液初始浓度18.75 mg/L,p H值为6~7时2-萘酚光催化降解效果最好;混合体系中的2-萘酚的降解率及Cr(VI)还原率均较相应的单一体系高,Cr(VI)的还原与2-萘酚的氧化之间产生了协同效应。Cr(VI)和2-萘酚的光催化反应均为拟一级反应动力学。     

有机膨润土负载纳米铁类Fenton法去除水中2,4-二氯酚

利用十六烷基三甲基铵盐改性的膨润土(DK1),采用液相还原法制备DK1负载纳米零价铁(n ZVI/DK1),并结合类Fenton法研究水溶液中的2,4-二氯苯酚(2,4-DCP)的去除.分别考察了DK1吸附,n ZVI/DK1吸附还原,n ZVI/H2O2类Fenton氧化,n ZVI/DK1/H2O2类Fenton氧化四种方法对水溶液中2,4-DCP的去除效果,同时探讨了不同因素如初始p H值、H2O2浓度、n ZVI/DK1投加量、2,4-DCP初始质量浓度对2,4-DCP去除的影响.结果表明:DK1,n ZVI/DK1,n ZVI/H2O2,n ZVI/DK1/H2O2对2,4-DCP的去除率分别为29.0%,45.7%,20.2%,71.1%.深入研究不同因素对2,4-DCP去除效果影响的结果发现,p H值、H2O2浓度控制着Fe0在Fenton中活性以及催化性,从而显著影响着2,4-DCP的降解率.在p H 3.0,H2O2浓度为10 mmol·L-1,n ZVI/DK1投加量质量浓度为0.5 g·L-1,2,4-DCP初始质量浓度50mg·L-1时,2,4-DCP去除率达到93.4%.溶液COD去除率高达78.6%,进一步证明n ZVI/DK1在类Fenton法中具有吸附和降解性能.     

PW/MCM-41光催化降解亚甲基蓝溶液研究

制备并表征了介孔分子筛MCM-41负载杂多酸H3PW12O40(PW)光催化剂.可见光照射下对模拟染料废水亚甲基蓝(MB)溶液进行了光催化降解实验,考察了影响催化降解的主要因素.结果表明:催化剂加入量为3.0g·L-1,MB初始浓度为10mg·L-1,pH=5时,在可见光照射下,亚甲基蓝溶液降解率最高可达92.57%.     

TiO2光催化氧化降解偶氮染料

研究了催化剂,光源、溶液初始浓度、溶液初始pH值等因素对甲基橙光催化氧化降解反应的影响.实验结果表明,最佳实验条件为:以灼烧的TiO2为催化剂,催化剂的投加量为0.8g.L-1,采用浸没式紫外灯作光源,甲基橙初始浓度为20mg·L-1,溶液初始pH=3.该实验条件下,甲基橙一小时脱色率可达81.3%.该研究可为偶氮染料降解提供新的思路.     

响应面法优化NaClO_2/UV降解藏红T及动力学研究

采用NaClO_2/UV降解藏红T染料废水,研究染料初始质量浓度、p H、NaClO_2投加量、UV照射时间对藏红T脱色率的影响及降解过程的动力学,应用响应曲面法优化得出最佳条件.通过紫外可见光谱及红外光谱分析,考察藏红T染料的矿化程度.结果表明,NaClO_2/UV能够有效降解藏红T,降解过程符合一级动力学,单个因素对藏红T降解效果的影响顺序为:p HUV照射时间初始质量浓度NaClO_2投加量.当p H为4.45、初始质量浓度为44.02 mg·L-1、NaClO_2投加量为136.54 mg·L-1、UV照射时间为19.40 min时,藏红T的脱色率达到97.31%.     

钐掺杂二氧化钛纳米管光催化降解孔雀石绿废水

采用阳极氧化法制备板式钐掺杂二氧化钛纳米管阵列催化剂(Sm-TiO2),并以孔雀石绿废水为降解对象,在模拟可见光照射条件下考察钐掺杂浓度、钛板煅烧温度、废水浓度等对孔雀石绿废水降解性能的影响.结果表明,当钐掺杂浓度为0.001 8mol·L-1、钛板煅烧温度选择450℃、废水的初始质量浓度为10mg·L-1时,Sm-TiO2催化剂的光催化降解效率最高可达92.6%,表现出良好的光催化活性和稳定性.     

Fenton试剂处理染料废水的试验

采用Fenton试剂处理碱性紫染料废水,考察pH值、H2O2和Fe2 投加量、反应温度等对脱色效果的影响.实验结果表明,当碱性紫的初始浓度为50 mg.L-1,反应温度为25℃,pH值为3.0,H2O2投加量为0.5Qth,n(H2O2)∶n(Fe2 )为10∶1的条件下,脱色率可达98%以上.在相同条件下,Fenton试剂对甲基橙和亚甲基蓝染料废水均取得满意的处理效果.     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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