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高度有序的TiO2纳米管阵列光催化性能研究 总被引:2,自引:2,他引:0
采用恒压阳极氧化法在纯钛箔表面制备TiO2纳米管阵列,利用SEM和XRD对其进行了形貌和晶型的分析和表征,并通过TiO2纳米管阵列膜对甲基橙光催化降解,探讨光照时间、甲基橙溶液的初始浓度、溶液的初始pH值和H2O2加入浓度等因素对甲基橙的脱色率影响.结果表明,H2O2加入浓度为50mg·L-1,紫外光照射2h,溶液为中性时,在30 mg·L-1的甲基橙溶液(50mL)中,甲基橙溶液的脱色率达到100%.当H2O2加入浓度进一步增大到100 mg·L-1时,光催化的效率进一步提高,紫外光照射1h,甲基橙溶液的脱色率就已经达到了100%,并未出现抑制光催化的现象.同时还研究了TiO2纳米管阵列电极的稳定性.实验结果表明,随着TiO2纳米管阵列使用次数的增加,其光催化效果略有所下降. 相似文献
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多壁碳纳米管修饰丝网印刷电极同时检测水中苯二酚异构体的研究 总被引:1,自引:1,他引:0
采用丝网印刷技术和滴涂法制备了一种可抛型的多壁碳纳米管修饰丝网印刷电极,并将其用于水中的对苯二酚、 邻苯二酚和间苯二酚等苯二酚异构体的同时检测.苯二酚在此修饰电极上的循环伏安行为考察显示,该电极可较好地区分3种异构体的氧化峰,对其氧化还原反应有明显的电催化作用;以差示脉冲伏安法检测对苯二酚、 邻苯二酚和间苯二酚的混合水样,其峰电流与浓度分别在8.20×10-6~1.00×10-3、 8.20×10-6~1.00×10-3和1.64×10-5~1.16×10-3 mol·L-1范围内呈良好的线性关系,检出限分别达4.34×10-6、 3.42×10-6和6.70×10-6 mol·L-1;对污染水样进行测定,加标回收率为96.2%~104.9%.研究结果表明,多壁碳纳米管修饰的丝网印刷电极可用于苯二酚异构体污染水样的现场快速检测. 相似文献
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利用多巴胺(DA)的自聚合特性对多壁碳纳米管(MWCNT)进行非共价改性,制备了多巴胺改性碳纳米管超滤膜(PDA/MWCNT),并对其抗污染性能进行了系统研究.采用X射线光电子能谱、傅里叶红外光谱、接触角测量仪和扫描电镜对PDA/MWCNT膜进行亲水性和化学组成的表征.选取大肠杆菌菌液为目标污染物,研究了不同改性条件对PDA/MWCNT膜抗污染性能及抗蛋白黏附能力的影响.结果表明,DA成功引入到MWCNT表面.DA与MWCNT交联时间为5h、DA浓度1g/L、MWCNT负载量2.17mg/cm2时,MWCNT膜的接触角由改性前112.79°降至8.4°.改性后PDA/MWCNT膜表面的氧元素含量为改性前的2.9倍,膜的亲水性得到显著改善.膜通量较改性前提高1倍,膜的抗污染性能、抗菌性及抗蛋白黏附能力得到显著提高,错流冲洗后的膜通量恢复率从56.62%增加到88.74%. 相似文献
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沈广义 《中国个体防护装备》2010,(2):27-30
现代高科技武器的发展以及日益复杂的作战环境对防弹衣的防弹性能和穿着舒适性提出了更高要求。新材料仍将成为下一代新型防弹衣的开发方向。本文介绍的碳钠米管纤维早在20世纪90年代就已经被发现。由于其制造成本贵比黄金而一直未被广泛使用。近年来随着工艺技术的改进及生产规模的扩大,碳纳米管的生产成本大幅降低,其开发潜能和应用前景逐渐受到材料科学界和高新技术产业部门的关注。本文在分析现代常用防弹衣防弹机理的基础上着重论述碳钠米管作为超级纤维的独特性能在防弹领域中的应用优势。 相似文献
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Gholamreza GHASEMZADEH Mahdiye MOMENPOUR Fakhriye OMIDI Mohammad R. HOSSEINI Monireh AHANI Abolfazl BARZEGARI 《Frontiers of Environmental Science & Engineering》2014,8(4):471-482
Nanotechnology has revolutionized plethora of scientific and technological fields; environmental safety is no exception. One of the most promising and well- developed environmental applications of nanotechnology has been in water remediation and treatment where different nanomaterials can help purify water through different mechanisms including adsorption of heavy metals and other pollutants, removal and inactivation of patho- gens and transformation of toxic materials into less toxic compounds. For this purpose, nanomaterials have been produced in different shapes, integrated into various composites and functionalized with active components. Nanomaterials have also been incorporated in nanostructured catalytic membranes which can in turn help enhance water treatment. In this article, we have provided a succinct review of the most common and popular nanomaterials (titania, carbon nanotubes (CNTs), zero-valent iron, dendrimers and silver nanomaterials) which are currently used in environmental remediation and particularly in water purification. The catalytic properties and functionalities of the mentioned materials have also been discussed. 相似文献
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Environmental supply chain is a desirable alternative to traditional supply chain due to new and stricter environmental regulations by local governments and increasing consumer awareness towards environmental issues. The two most common types of environmental supply chains are reverse supply chains and closed-loop supply chains. In reverse or closed-loop supply chains, collected used products are subjected to one of four recovery options, viz., reuse, recycling, remanufacturing or disposal. Regardless of the chosen recovery option, all products are disassembled up to some level. However, there is a high level of uncertainty associated with the disassembly yield due to non-functional and/or missing components. Sensor embedded products (SEPs) is a viable approach to cope with this uncertainty since they involve sensors which can detect non-functional and/or missing components prior to disassembly. This study presents a quantitative assessment of the impact of SEPs on the various performance measures of a kanban-controlled disassembly line. First, separate design of experiments studies based on Orthogonal Arrays are carried out for conventional products and SEPs. Then, the results of paired t-tests comparing the two cases based on different performance measures are presented. 相似文献
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利用废气中本身含有的CO催化还原烟气中的NOx,可以实现以废治废。采用TiO2纳米管负载CeO2,制备CeO2/TiO2纳米管催化剂,并对其进行了SEM表征及影响因素实验。实验结果表明:在n(Ce)∶n(Ti)=3∶7、焙烧温度500 ℃、焙烧时间3 h时制备的CeO2/TiO2纳米管催化剂形貌较好,表面颗粒分布相对均匀;反应温度400~600 ℃时NO脱除率达98%;该催化剂具有一定的抗氧性能;当n(SO2)∶n(NO)=(1∶2)~(2∶1)时,NO脱除率仍然在95%以上。 相似文献
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We have developed a new nanofilter using a carbon nanotube-silver composite material that is capable of efficiently removing waterborne viruses and bacteria.The nanofilter was subjected to plasma surface treatment to enhance its flow rate,which was improved by approximately 62%.Nanoscale pores were obtained by fabricating a carbon nanotube network and using nanoparticle fixation technology for the removal of viruses.The pore size of the nanofilter was approximately 38 nm and the measured flow rate ranged from 21.0 to 97.2 L/(min·m~2)under a pressure of 1–6 kgf/cm~2 when the amount of loaded carbon nanotube-silver composite was 1.0 mg/cm~2.The nanofilter was tested against Polio-,Noro-,and Coxsackie viruses using a sensitive real-time polymerase chain reaction assay to detect the presence of viral particles within the outflow.No trace of viruses was found to flow through the nanofilter with carbon nanotube-silver composite loaded above 0.8 mg/cm~2.Moreover,the surface of the filter has antibacterial properties to prevent bacterial clogging due to the presence of 20-nm silver nanoparticles,which were synthesized on the carbon nanotube surface. 相似文献