细菌纤维素负载稀土掺杂二氧化钛复合膜的制备和光催化性能

以细菌纤维素(BC)为载体,用溶胶-凝胶法原位生成稀土镧和铈元素(La,Ce)掺杂的二氧化钛复合膜,以甲基橙为目标降解物,考察了复合膜的光催化活性。结果表明:稀土元素已引入TiO_2/BC复合膜中;掺杂TiO_2的晶型为锐钛矿型;掺杂稀土的TiO_2/BC复合膜的光催化活性比未掺杂的有较大提高;铈掺杂的TiO_2/BC复合膜的光催化性能优于镧掺杂的;Ce~(4+)掺杂的最适浓度为2 mmol/L,而La~(3+)掺杂的最适浓度为5 mmol/L;稀土掺杂的TiO_2/BC复合膜对甲基橙溶液重复降解5次的降解率仍高于70%。     

Ag~+掺杂FeVO_4光催化剂的制备及光催化性能

采用液相沉淀法制备了银(Ag+)掺杂钒酸铁(FeVO4)光催化剂。采用XRD、SEM、EDS、BET和XPS等手段对样品的性能进行了表征分析,并以甲基橙为目标降解物,考察了催化剂在节能灯照射下的光催化活性。结果表明,Ag的掺杂没有改变FeVO4晶型,但引起了晶格畸变和膨胀。适量Ag的掺杂可提高FeVO4的光催化性能,在所进行实验的条件下,钒酸银最佳掺杂量为1%(质量分数)时,掺杂后的Fe-VO4对甲基橙溶液的脱色率较未掺杂前提高21%左右。     

新生MnO2对二甲酚橙和亚甲基蓝的处理

研究了新生MnO2对二甲酚橙和亚甲基蓝的脱色效果,考察了影响脱色效果的主要因素.实验结果表明,新生MnO2对二甲 酚橙的脱色效果较好;当二甲酚橙质量浓度为40 mg/L,溶液pH值为5,常温下震荡30 min,新生MnO2的加量为50 mg时,对二甲酚橙的去除率可达95%.新生MnO 2对亚甲基蓝的脱色效果差,最佳条件下的去除率仅为76%.     

Synthesis of Ultrafine K2Ln2Ti3O10 by Microemulsion Method and Its Photoactivity Research

A series of uhrafine K2Ln2Ti3O10（Ln = La, Ce, Pr, Nd, Sm, Eu, Dy）photocatalyst was prepared by microemulsion method based on tetrabutyl titanate reacting with potassium hydroxide and lanthanumoxide. The obtained products were characterized by XRD, TEM and UV-Vis spectra. These results indieate that highly ultrafine K2Ln2Ti3O10 can be accessible at lower fabricating temperature and shorter reation time by this approach. In addition, the investigation on their eatalytieal behavior based on the degradation of methyl orange under UV-Vis light suggests that the degradation rate can reach up to 60%.     

Hg（Ⅱ）—KI—XO—Gum—PVA显色体系的研究和应用

在非离子表面活性剂阿拉伯树胶和聚乙烯醇存在下，汞与碘化钾和二甲酚橙在水相中形成稳定的多元配合物显色体系该配合物在５３０ｎｍ处有一最大吸收波长，汞含量在０～１２μｇＨｇ２＋／２５ｍＬ范围内服从Ｂｅｅｒ定律，表观摩尔吸光系数高达２６９×１０６Ｌ·ｍｏｌ－１，ｃｍ－１，平均回收率达９７４％～１０２５％用这一显色体系测定乳制品中微量汞，结果令人满意     

Nano-TiO2 particles with increased photocatalytic activity prepared by the miniemulsion method

The water-in-oil (W/O) miniemulsion system was used to prepare nano-TiO₂ particles. The nano-TiO₂ particles were characterized by XRD, FTIR, DRS, SEM and BET surface area analysis. The photoactivity of nano-TiO₂ particles was evaluated by photocatalytic degradation of methyl orange. The results show that nano-TiO₂ particles, prepared by miniemulsion, have a higher efficiency in decomposition of methyl orange than P25 and TiO₂ synthesized via the sol-gel method due to the high surface area and optimum phase constitution.     

利用热管改善传统广柑窖的贮藏热环境

本文提出一种改善传统广柑窑贮藏热环境的新方法;利用热管散热器对地窑强制蓄冷、除热。并对该种地窖的热过程和科学管理方式进行探讨。