La3+掺杂TiO2催化降解染料废水的研究

用超声共振法制备了稀土金属La3+参杂的TiO2催化剂,并利用XRD对其进行表征,研究了催化剂对媒介漂兰染料废水的降解及影响降解率的主要因素.结果表明:稀土La3+掺杂TiO2催化剂比纯TiO2降解媒介漂兰染料溶液的效果要好;当媒介漂兰染料的初始质量浓度为20 mg,/L,pH=5,掺杂La3+ 0.8％(摩尔分数)的TiO2催化剂用量为1.0 g/L时,降解率可达93％.焙烧温度为550℃时,该催化剂活性最好,以锐钛矿相存在.     

TiO2/H2O2/超声波协同处理二甲酚橙溶液

研究了TiO2/H2O2/超声波协同作用对二甲酚橙溶液降解率的影响以及影响降解率的主要因素.结果表明:当二甲酚橙初始质量浓度为20 mg/L,pH值为1,TiO2用量为0.4 g/L,H2O2:用量为0.4 mL/L时,经TiO2/H2O2/超声波协同作用后,二甲酚橙的降解速率大大加快,降解效果也比较好,降解率可达92%.     

新型纳米I-TiO2催化降解酸性红B的研究

以钛酸四丁酯为前驱体,采用溶胶-凝胶法制备了I掺杂改性纳米TiO2光催化剂(I-TiO2).在模拟太阳光照射下,研究了该催化剂的制备条件、溶液pH值以及添加H2O2浓度等对酸性红B光催化降解性能的影响.结果表明:以TiO2为母体掺杂I[χ(I)=10%],在500℃下煅烧2 h得到的I-TiO2光催化剂对太阳光有良好的响应性;当催化剂用量为1.5 g/L,pH=8时,对10 mg/L酸性红B的降解率可达95%.此外,加入H2O2可提高催化剂活性,选择c(H2O2)=O.18 mol/L.     

CoPcS/TiO2/beads及TiO2/beads光催化降解水面浮油

以钛酸四丁酯为原料,空心玻璃微珠(beads)为载体,采用溶胶一凝胶法制备出TiO2/beads光催化剂,用浸渍法制备出CoPcS/TiO2/beads新型光催化剂.研究了利用TiO2/beads及CoPcS/TiO2/beads光催化剂降解水面漂浮植物油的最优条件.结果表明:(1)溶胶-凝胶法制备TiO2/beads的最佳条件为:空心玻璃微珠浸渍3次,450～550℃下焙烧2 h.用CoPcS对TiO2/beads进行改性时,TiO2/beads的最1圭浸渍时间为30 min.(2)在中性或酸性条件下,375 W中压汞灯光照2～3 h,TiO2/eads与CoPcS/TiO2/beads的最佳用量分别为3 g和1 g(植物油3 g),在此条件下,植物油的去除率都高达90%.(3)微量H2O2对TiO2/beads和CoPcS/TiO2/beads的光催化活性都有很大的提高.对于TiO2/beads催化剂,H2O2的最佳用量为5～11 mmol/L;对于CoPcS/TiO2/beads催化剂,H2O2的最佳用量为5～30 mmol/L.(4)新型光催化剂CoPcS/TiO2/aeads比TiO2/beads具有更好的除油性能.     

Fe2O3/TiO2异质结的制备及光催化降解性能

结合静电纺丝技术和水热法制备Fe2O3/TiO2异质结光催化材料.利用扫描电镜(SEM)、X射线衍射(XRD)、傅立叶转换红外光谱(FT-IR)及比表面分析等方法,对Fe2O3/TiO2异质结的形貌、晶型、化学组成等进行表征.利用Fe2O3/TiO2材料对罗丹明B(RB)进行光催化降解,结果表明,Fe2O3/TiO2对RB的降解速率高于纯TiO2纳米纤维,而且掺铁量为0.5%时降解效果最好.     

镧掺杂TiO2光催化降解酸性红B的研究

采用溶胶-凝胶法制备了La^3＋／TiO2光催化剂，在模拟太阳光照射下，考察了该催化剂对酸性红B的光催化降解效果。结果表明：掺杂量ω（La^3＋）1％、催化剂用量1g／L、通气量100 mL／min、体系pH值是7时，50mg/L的酸性红B经3 h光催化降解，其降解率可达92．9％：与纯TiO2相比，La^3＋／]TiO2光催化剂显示出良好的太阳光催化活性：     

TiO2光催化技术处理制浆造纸废水的试验研究

探讨了TiO2光催化技术处理纸厂废水时的影响因素,并由此确定出较优的反应条件为催化剂选择20%金红石和80%锐钛矿组成的混晶型TiO2,催化剂用量1g/L,曝气采用纯氧曝气,O2流速为0.5L/min。在此条件下,研究了制浆造纸废水TiO2光催化降解效果;结果表明TMP废水、纸厂废水等低浓低污染物废水比KP废水更适宜于TiO2光催化降解处理。     

TiO2/H2O2光催化处理OCC造纸废水的探讨

以中压汞灯作光源、TiO2为催化剂,进行光催化降解OCC造纸废水的试验研究。考察了TiO2用量、H2O2用量、光照时间、pH值四个因素对降解效果的影响。试验表明：TiO2用量2.5g/L、H2O2用量（以体积分数计）为0.3%,CaO调节废水初始pH值为8的条件下,于25℃汞灯光照4h后,CODCr的去除率和脱色率分别...     

掺锌纳米TiO_2光催化性能研究

以钛酸四丁酯、硝酸锌为主要原料,采用溶胶-凝胶法制备掺锌纳米TiO2微粒.以罗丹明B为目标降解物,考察了掺锌纳米TiO2粉体的光催化活性.结果表明:300℃焙烧4.5 h时,得到的催化剂活性最高.在紫外光照射下,催化效果明显优于太阳光照射(在紫外光下,pH值为2时,用1 g/L掺锌2.7%纳米TiO2光照70 min,罗丹明B的降解率接近100%;在太阳光下,pH值为10时,用4 g/L掺锌3.0%纳米TiO2光照120 min,罗丹明B的降解率达93%).     

掺氮TiO_2复合材料可见光催化降解酸性红3R

采用溶胶-凝胶法制备掺氮-TiO2溶胶,并浸渍负载于活性炭表面,得到掺氮TiO2/活性炭(AC)的复合材料。以酸性红3R为模拟降解物,考察氮掺杂量、催化剂用量、酸性红3R初始质量浓度和pH值等因素对可见光下光催化降解效果的影响。结果表明,氮掺杂TiO2/AC光催化剂中TiO2均为锐钛矿晶相。在掺氮-TiO2/AC质量浓度为2g/L、初始pH值为3的条件下,可见光催化降解150min,酸性红3R的去除率达96.8%;降解过程符合准一级反应动力学方程。     

GC-MS分析Fe2+/S2O82--H2O2深度处理造纸废水有机污染物降解研究

采用Fe2+/S2O28--H2O2深度处理广东某造纸厂二级出水,处理80min时COD降解率达到65%,色度去除率达到55%,达到《制浆造纸工业水污染物排放标准》(GB3544-2008)要求。用GC-MS联用仪对深度处理前后废水中的有机物进行测定,共测得有机污染物50种,其中6种有机污染物被列入美国EPA环境优先控制污染物。通过分析有机污染物分布情况,揭示其在深度处理过程中的降解与转化规律。     

钼酸盐对桉木KP浆H2O2漂白的改善效果

研究了钼酸盐对桉木硫酸盐氧漂浆酸性H2O2漂白的改善效果,探讨了各种影响因素（钼酸盐用量、漂液pH值、H2O2用量、氧强化的碱抽提和洗涤方式）对酸性H2O2漂白结果的影响。结果表明：添加少量的钼要到盐能有效地促进酸性H2O2的脱木素反应,提高脱木素效率,增加纸浆的白度。当钼酸盐用量为0.1%,脱木素程度比单纯的H2O2漂段提高27.8%漂段提高27.8%,白度增加4.3%（ISO）,而粘度的损失不大。     

Effects of ZnCl2/H2O/C2H5OH Treatment on the Filter Paper Performance

Bleached softwood kraft pulp (BSKP) fibers were pretreated in a 5 mol/L NaOH aqueous solution at 35℃ for 90 min. The ZnCl₂/H₂O/C₂H₅OH was used to treat the pretreated BSKP fibers, filter papers were then prepared. In the course of processing, the effects of various molar ratios of ZnCl₂/H₂O/C₂H₅OH on the filter paper performance were evaluated. SEM-EDX was conducted to analyze the physical configuration of the filter papers. Moreover, FT-IR and XPS were performed to further characterize the BSKP, the pretreated BSKP and the filter paper fibers. The results indicated that the fibers treated by ZnCl₂/H₂O/C₂H₅OH were swollen and exhibited slight fibrillation, leading to a looser fiber structure and therefore, enhanced filter paper performance. Air permeability increased from 161.7 L/(m²·s) to 1450.4 L/(m²·s) for the filter papers when the molar ratio of ZnCl₂/H₂O/C₂H₅OH was 1:14:1. The optimum molar ratio of ZnCl₂/H₂O/C₂H₅OH was found to be 1:14:1, and no significant effect of ZnCl₂/H₂O/C₂H₅OH on fibers’ functional groups was detected. These results showed that filtration performance of filter papers was improved when treated with the ZnCl₂/H₂O/C₂H₅OH solution.     

关于指数Diophantine方程x^2＋2^（2m）=y^n

运用Lucas数本原素因数存在性的结果讨论方程x^2＋2^2m=y^n的正整数解（x,y,m,n）,证明了该方程仅有正整数解（x,y,m,n）=（2^（n-1）/2,2^r（rs-1）/2,s）和（2^3k.11,2^2k.5,3k＋1,3）适合n〉2,其中r和s是适合s〉2的正奇数,k是非负整数.     

Oxidation of Tryptophan by H2O2 in Model Systems

Degradation reactions of tryptophan (trp) and the dipeptides alanyltryptophan (ala-trp) and phenylalanyltryptophan (phe-trp), induced by H₂O₂, were investigated under different conditions in aqueous systems. Decreases in the content of trp as well as the formation of soluble degradation products were determined. Highest losses of trp were obtained after H₂O₂ treatment at 100°C for 2 hr at pH 8.5. Lowest losses occurred at pH 4.0, 25°C, for 30 min. The destruction of trp in ala-trp was similar, while losses of trp in phe-trp under the same reaction conditions were lower. This was indicative of a negative induction effect of the phenyl ring. The quantity of degradation products showed extensive variations, dependent upon the radical mechanism of the oxidation reaction.