Post-illumination activity of Bi2WO6 in the dark from the photocatalytic “memory” effect

来源 :先进陶瓷(英文版) | 被引量 : 0次 | 上传用户:gengxuetao
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Photocatalysts with the photocatalytic “memory” effect could resolve the intrinsic activity loss of traditional photocatalysts when the light illumination is turned off. Due to the dual requirements of light absorption and energy storage/release functions, most previously reported photocatalysts with the photocatalytic “memory” effect were composite photocatalysts of two phase components, which may lose their performance due to gradually deteriorated interface conditions during their applications. In this work, a simple solvothermal process was developed to synthesize Bi2WO6 microspheres constructed by aggregated nanoflakes. The pure phase Bi2WO6 was found to possess the photocatalytic “memory” effect through the trapping and release of photogenerated electrons by the reversible chemical state change of W component in the (WO4)2– layers. When the illumination was switched off, Bi2WO6 microspheres continuously produced H2O2 in the dark as those trapped photogenerated electrons were gradually released to react with O2 through the two-electron O2 reduction process, resulting in the continuous disinfection of Escherichia coli bacteria in the dark through the photocatalytic “memory” effect. No deterioration of their cycling H2O2 production performance in the dark was observed, which verified their stable photocatalytic “memory” effect.
其他文献
Oxide-based ceramics could be promising thermoelectric materials because of their thermal and chemical stability at high temperature. However, their mediocre el
针对信道间干扰、天线间同步等问题,提出了基于正交空间调制的认知协作通信系统。该系统采用均值功率分配算法,中继节点和目的节点采用最大似然检测算法。推导了随机中继选择、次优中继选择和最优中继选择3种方案下中断概率的准确闭合表达式,以及在高信噪比区域的渐进表达式,并分析了系统的分集增益。蒙特卡罗仿真结果表明:与随机中继选择相比,次优中继选择和最优中继选择方案可以明显降低系统的中断概率,有效提高系统增益。
分解炉出口温度是水泥生产过程中的关键指标。针对传统预测方法只考虑风、煤、料影响的问题,提出一种弹性网(ElasticNet)结合长短时记忆(Long Short-Term Memory,LSTM)神经网络的温度预测模型。利用弹性网方法对不同变量进行参数估计,充分考虑影响因素并实现变量筛选,同时分析隐含层和节点数对神经网络精确度的影响,构建ElasticNet-LSTM出口温度预测模型。仿真结果表明
Inkjet printing is a promising alternative for the fabrication of thin film components for solid oxide fuel cells (SOFCs) due to its contactless, mask free, and
为研究微沟槽结构精密磨削形成及其影响规律,以砂轮修整和磨削运动学为基础,建立了微沟槽结构表面的磨削仿真模型。系统分析了修整、磨削参数和节圆长度对微沟槽结构轮廓的影响,阐述了形成完整或干涉微沟槽轮廓的磨削条件,预测了微沟槽轮廓及尺寸,并在碳钢上进行了磨削试验。试验结果与仿真模型的趋势一致,微沟槽结构的轮廓和尺寸受磨削切深和节圆长度的影响变化较大,受修整深度和修整重叠率影响较小;同时经过试验验证,仿真
以飞机虚拟维修训练的实际应用为需求,分析了飞机虚拟维修训练仿真模型基本开发流程和技术手段,解决了开展大规模工程推广应用中的技术瓶颈。针对维修训练仿真模型开发效率低、更新困难等突出问题,提出了支持大规模工程应用的快速开发流程,并对支撑虚拟维修训练仿真模型快速开发的维修任务建模、仿真模型装配、仿真模型更新3项关键技术的原理及实现途径进行了论述。最后用某型号工程实例进行了技术开发实现并通过应用验证。
分数阶模型需要辨识更多的参数,为了建立高精度的分数阶模型,提出一种应用于分数阶系统辨识的改进差分进化算法。在变异策略中基向量从最优个体种群中随机选取,在搜索过程中根据成功变异个体的信息自适应调整缩放因子和交叉概率因子,提高算法的勘探和开采能力。通过求解5个测试函数,证明了改进算法具有较强的求解能力。以永磁同步电机的分数阶模型为例,辨识结果表明:改进差分进化算法在求解精度和收敛速度上具有更好的性能。
城镇化背景下,社会网络弱连接关系增多,对弱势语言保护提出了挑战。基于改进的agent社会圈子网络建模方法构建了具有远程弱连接关系的新型社会网络;不同人群语言演化机制上除考虑语言地位和语言人口比例的影响外,引入了双语者对单语者向双语者转变的影响力、语言态度和网络连接关系对语言选择行为的影响新机制;给出了改进的agent语言水平和垂直传播模型。计算实验结果表明:在社会网络弱连接关系增多背景下,培养积极
The dielectric capacitor has been widely used in advanced electronic and electrical power systems due to its capability of ultrafast charging–discharging and u
High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite (SG) as the attenuating agent were fabricated through hot-p