Y^3＋/TiO2粒子的制备及其光催化降解结晶紫的探究

通过溶胶-凝胶法制备了稀土金属离子Y^3＋掺杂的TiO2光催化剂,用XRD进行了分析和表征.以紫外灯为光源,通过对结晶紫的降解反应,研究了掺杂稀土离子钇的TiO2催化活性.结果表明,Y^3＋的掺杂减小了TiO2的粒径,提高了TiO2的光催化活性,反应体系在Y^3＋掺杂量为1.2%,催化剂用量1.5g/L,经500℃煅烧的条件下制备的Y^3＋-TiO2催化下效果最好.降解浓度4.0mg/L结晶紫2小时后,降解率可达90%.     

5-磺基水杨酸增敏化学发光分析法同时测定两种价态铁

用5—磺基水杨酸增敏鲁米诺—溶解氧—Fe2+—铜锌还原柱体系化学发光强度,同时测定两种价态的铁,使Fe2+和Fe3+的测定灵敏度均提高了10倍. Fe2+ 和Fe3+的线性范围均为110-5～110-10mol/L,检出限分别为2.810-11mol/和3.510-11 ,RSD分别为3.5%和3.9% . 此法用于水样中两种价态的铁的测定,结果令人满意.     

紫贻贝对海水中镉富集规律的研究

利用原子吸收分光光度法研究暴露实验中紫贻贝（Mytilus edulis）对镉富集的生物动力学特性及铜离子对紫贻贝吸收镉离子吸收的影响．结果表明,在不同浓度的镉溶液中,随着暴露时间的延长,紫贻贝对镉的富集量逐步增加,12d（288h）后,在镉浓度为0．01、0．2mg／L溶液中紫贻贝富集的镉含量趋向于平衡,在0．2mg／L的镉溶液中的富集量达73．64mg／（kg干重）．在铜离子存在下,实验进行10d结束时,实验组比对照组的镉含量高7．36mg／（k干重）,说明铜离子对紫贻贝吸收镉离子有促进作用．     

铜锌汞铬4种重金属离子对方形环棱螺的急性毒性效应

探讨铜、锌、汞、铬4种重金属离子对方形环棱螺（Bellamya quadrata）成体螺的急性毒性,并求出4种重金属相应的半致死浓度和安全浓度。结果显示：铜、锌、汞、铬对方形环棱螺成体螺96h的半致死浓度分别为0．0430、1．3301、0．1390,3．6275mg/L,经验公式求得其安全浓度分别为0．0043、0．1330,0．0139,0．3628mg/L。4种重金属离子的毒性由强至弱依次为：铜〉汞〉锌〉铬。     

竹炭负载纳米级零价铁去除水中的甲基橙

采用竹炭负载纳米级零价铁,分别考察了竹炭、纳米级零价铁和竹炭负载纳米级零价铁对0.2 L、200 mg/L的甲基橙溶液的去除率,并探讨了竹炭投加量、溶液pH值、染料初始浓度和反应温度对竹炭负载纳米级零价铁去除甲基橙能力的影响.结果表明：在0.20 L浓度为200 mg/L的甲基橙溶液中,竹炭投加量为0.015 g、30℃、pH为6.0、反应时间为60 min时,竹炭负载纳米级零价铁对甲基橙染料的去除率最高可达99.94％,而竹炭本身的去除率仅为13.6％.     

Pd/Fe与Fe~0催化还原降解酸性紫红B的动力学比较

采用Fe0还原、钯催化法对偶氮染料———酸性紫红B进行还原脱色研究,测定了钯/铁及普通铁粉在相同条件下对酸性紫红B的还原降解反应速率常数.实验表明,酸性紫红B的零价铁及钯/铁催化还原降解均遵守一级动力学,且钯/铁的反应速率常数较普通铁粉有明显增大.     

不同金属离子和pH对白腐菌Ganoderma lucidum产漆酶的影响

在发酵培养基中添加不同浓度金属离子,研究Zn2+,Cu2+,Mn2+,Mg2+和Fe2+等金属离子的浓度和p H对白腐菌Ganoderma lucidum生产漆酶的影响.结果表明:Zn2+、Cu2+和Mn2+对G.lucidum生产漆酶有不同程度促进作用,其中Cu2+的促进作用最大,Mg2+在高浓度时促进产酶,Fe2+则抑制漆酶的生产;p H为5时最利于漆酶的生产,酶活可达到140 000 U/L.     

SO42-/TiO2-Fe2O3光催化性能研究

溶胶-凝胶法制备SO42-/TiO2-Fe2O3,以结晶紫为降解体系.研究其光催化性能.研究表明溶胶-凝胶法制备的SO42-/Fe2O3-TiO2复合物在500℃下煅烧,n(Ti)n(Fe)为61时对结晶紫的降解效果最好.     

零价铁还原降解活性艳红X-3B的动力学研究

研究了不同表面积的零价铁还原降解活性艳红X-3B的动力学,结果表明零价铁对活性艳红X-3B的脱色反应符合准一级动力学过程,且随着铁粉的表面积增大及溶液的pH降低,反应动力学常数增大.     

Fe^3＋掺杂TiO2可见光催化降解酸性红的研究

研究了在可见光条件下,用实验室合成的Fe3＋掺杂TiO2为催化剂催化降解酸性红染料,重点考察了Fe3＋的掺杂量、Fe3＋掺杂TiO2为催化剂的添加量、酸性红溶液的初始浓度、溶液pH值、光照时间对降解率的影响.实验结果表明,Fe3＋掺杂比为1.5%、催化剂用量为1.5 g/L、pH为2.0、质量浓度为40 mg/L的酸性红100 mL,用白炽灯光照降解酸性红30 min,酸性红降解率可达98.45%.     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

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?     

钱生钱!

我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了     

Inequalities for inscribed simplexes

The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex.     

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.     

微薄的薪水,高尚的情操

现在,我们可以没有面包,没有钱,没有房子,没有车子……但我们唯独不能丢失的是高尚的情操,笃定的信念,还有,满满的希望!     

Virtual reality approach for 3D large model browsing on web site

Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching.