Applying facilely synthesized CuO/CeO2 photocatalyst to accelerate methylene blue degradation in hypersaline wastewater

Textile and dye effluents have strong color, unstable pH and COD, a lot of inorganic salt, and high biotoxicity. It is difficult and inefficient to remove dyes from high-saline wastewater by traditional methods. In this study, a simple synthetic CuO/CeO₂ photocatalyst is used to achieve high efficiency photodegradation of methylene blue in high salt wastewater. The p-type CuO/n-type CeO₂ heterojunction photocatalyst is synthesized by a modified hydrothermal-calcination method. The XRD and XPS reveal the successful synthesis of CuO/CeO₂ composite. The SEM and TEM images show that the sample consists of large amounts of well-dispersed CuO nanosphere loading on the CeO₂ layers. DRS exhibits the absorption band (about 510 nm) and the band gap energy (2.43 eV) of the CuO/CeO₂ composite. Compared with pure CuO, CeO₂, and TiO₂ (P25), the prepared CuO/CeO₂ can increase the mineralization rate of MB by 18.19%~33.74%. More than 80% of MB can be effectively removed in the wastewater containing 5~80 g/L NaCl with a wide pH value range of 2.11~9.02, and the degradation processes follow the pseudofirst-order reaction kinetics. Active species trapping experiments confirm that the degradation of methylene blue is mainly attributed to hydroxyl radical; besides, O₂^▪− and hole (h⁺) also play important roles. Chlorine ions have dual effects in photocatalytic reactions. This work could provide a new approach to construct new heterojunction photocatalysts and a deeper insight for the treatment of hypersaline dye wastewater.     

血红蛋白/光敏剂复合药物体系用于光动力治疗

通过等电点法实现了血红蛋白(Hb)与光敏剂药物七甲川花菁类小分子:11-氯-1,1'-二正丙基-3,3,3',3'-四甲基-10,12-三亚甲基吲哚三碳花青碘盐(IR780)的共担载,并研究了Hb供氧治疗与光动力治疗的联合治疗效果。 通过透射电子显微镜和动态光散射研究了Hb/IR780复合药物载体的形貌与稳定性,证明了药物载体在生理条件下能够稳定存在。 通过对药物在体外溶液和细胞水平的活性氧(ROS)检测,验证了Hb供氧能够有效地促进光敏剂ROS的产生,并且细胞毒性实验也证实了Hb/IR780复合药物载体拥有比单组份IR780药物更明显的肿瘤细胞杀伤效果。     

基于极化强度叠加模型的高功率微波混合气体传播特性

 基于气体极化强度叠加模型,推导了混合气体的介电常数,得到了高功率微波在混合气体中传播时的折射指数和衰减系数。研究发现,高功率微波大气电离产生的混合气体是快速时变的色散有耗介质。根据其色散性分析了微波在混合气体中的传播速度以及微波脉冲在其中的展宽效应,同时,根据其有耗性对微波脉冲在混合气体中传播时的缩短效应进行了研究。研究结果均能自洽地过渡到对流层或电离层电波传播理论。     

A simple and facile synthesis of tricyclic-fused pyrimido[4,5-<Emphasis Type="Italic">b</Emphasis>]indol-2-amines

In the present investigation, a simple and facile synthetic strategy for the construction of a series of structurally interesting tricyclic-fused N-alkyl-9H-pyrimido[4,5-b]indol-2-amines has been successfully achieved. Our synthesis, based on the annulation reaction between readily available 2-chloroindole-3-carbaldehydes or 3-acetyl-2-chloroindoles and guanidine nitrate using KOH as the base in refluxing EtOH medium, has the attractive features such as mild and economical reaction conditions and easy handing with lesser impact on the environment.     

吡唑三杂环化合物的制备表征及生物活性的研究

以1,3-二苯基-4-吡唑甲醛为原料, 合成中间体吡唑腙和吡唑基氨基硫脲, 进一步合成出一系列新颖的含有1,3,4-噁二唑, 1,2,4-三氮唑和1,3,4-噻二唑的吡唑三杂环的化合物, 通过抑菌圈法和营养肉汤法对所制备的化合物的抗菌活性进行了测试, 测试结果表明: 3-芳基-4-(1,3-二苯基-4-吡唑甲酰基)-1,2,4-三唑啉-5-硫酮对金黄色葡萄球菌具有良好的抗菌活性.     

高中化学探究性实验设计一例——含磷洗衣粉对水藻生长的影响

结合高中新课程教科书,设计高中化学探究性实验——含磷洗衣粉对水藻生长的影响,通过实验原理、方法和具体实验过程得出结论,有效地促进了学生对化学知识的理解和掌握,培养学生实验设计和探究能力,达到知识、能力、情意目标。     

加速离子的流洗色谱分离研究(Ⅰ)——Cu(Ⅱ)-氯合离子的加速作用

前报曾报导了Mn(Ⅱ)的加速效应。此后又肯定了这一效应的普遍性及应用于流洗色谱的可能性。本文发现了4NHCl中的CuCl _x^x-2-是一种有效的加速离子,可以改善U(Ⅵ)的色谱床效,以此实现了U(Ⅵ)、Ti(Ⅳ)和Fe(Ⅲ)的色谱分离。     

Graves病患者血清七种元素含量变化及临床意义

采用原子吸收和火焰光谱分析法，检测Graves病患者308例和209名正常对照组的血清微量元素Zn、Cu、Fe和常量元素Ca、Mg，K、Na含量．结果显示，Graves病患者Zn、Fe、Mg、K及Zn／Cu、Ha／K低于对照组．而Cu、Ca、Ca／MR则高于对照组．结合本研究结果，我们对七种元素与T3、T4及生化指标的关系进行了分析．     

Y2O2S：Eu，Ti，Mg红色长余辉的温度依赖

实际应用中在低温下一些长余辉材料不能正带工作，因此需要研究长余辉材料的温度依赖特性。用固相反应法合成了Y2O2S：Eu，Ti，Mg，测量了其余辉发射谱和热释光曲线，研究Y2O2S：Eu，Ti，Mg在140～300K和290～350K温区的长余辉发光的发射光谱和衰减曲线的温度依赖。当温度低于其热释光曲线起始点230K时，其余辉的发射光谱强度较弱。随温度增加，其余辉的发射光谱强度随温度增强。300K后，其余辉衰减时间随温度变快。Y2O2S：Eu，Ti，Mg长余辉的温度依赖行为与其热释光曲线密切相关，并通过长余辉机制对其进行了分析和讨论。