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以膨胀珍珠岩为载体,钛酸四丁酯为原料,用溶胶-凝胶法制备漂浮型纳米TiO2光催化剂,并用该光催化剂在太阳光下对亚甲基蓝进行光催化降解实验.结果表明,在450℃焙烧2h,负载3次的条件下制备的漂浮型催化剂光催化活性较好.150 mg漂浮型纳米TiO2/EP在30 mL亚甲基蓝溶液(4 mg/L)液面平铺,经120 min太阳光照射,亚甲基蓝的降解率为97.6%.XRD和SEM分析结果表明,二氧化钛为结晶良好的锐钛矿型,粒径大约为8nm.漂浮型纳米TiO2/EP有较广阔的工程应用前景. 相似文献
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《合成纤维工业》2017,(6):43-46
采用N,N-二甲基甲酰胺(DMF)为极性溶剂溶解醋酸锌(Zn(Ac)_2·2H_2O),然后加入聚丙烯腈(PAN)制得前驱体溶液,采用静电纺丝法制备PAN/Zn(Ac)_2复合纳米纤维膜,将PAN/Zn(Ac)_2复合纳米纤维膜在真空管式炉中经过高温煅烧得到PAN基碳纤维/氧化锌(CF/ZnO)纳米纤维膜,以CF/ZnO纳米纤维膜为光催化剂,亚甲基蓝为污染物,进行光催化降解实验,研究了Zn(Ac)_2含量对PAN/Zn(Ac)_2复合纳米纤维形貌、性能的影响,以及CF/ZnO纳米纤维膜的光催化性能。结果表明:Zn(Ac)_2的掺入并未对PAN的化学结构产生影响,二者属于物理结合,Zn(Ac)_2能较均匀地分布在纤维的内部;随着Zn(Ac)_2含量的增加,CF/ZnO纳米纤维膜对亚甲基蓝的降解率会提高,当Zn(Ac)_2质量分数(相对PAN)为60%时,可见光照射80 min后CF/ZnO纳米纤维膜对亚甲基蓝的降解率达到91.6%。 相似文献
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以均匀沉淀法制备纳米ZnO,并将其负载在氧化石墨烯(GO)上制得了ZnO/GO复合材料。XRD、TEM、UV、PL等证实在GO表面分散着颗粒均匀的ZnO纳米颗粒,GO与ZnO纳米颗粒之间存在电子转移效应,抑制ZnO中光生电子空穴对的复合,提高了ZnO的可见光催化性能;考察了复合材料在模拟太阳光条件下降解亚甲基蓝的光催化性能,当GO添加量为10%时,模拟太阳光照射90 min后,对亚甲基蓝的降解率达到97.2%,经过10次循环使用后降解率没有明显降低,复合材料的可见光催化活性明显优于纯的纳米ZnO,同时ZnO/GO复合材料对部分工业染料也有很好的降解活性。 相似文献
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以均匀沉淀法制备纳米ZnO,并将其负载在氧化石墨烯(GO)上制得了ZnO/GO复合材料。XRD、TEM、UV、PL等证实在GO表面分散着颗粒均匀的ZnO纳米颗粒,GO与ZnO纳米颗粒之间存在电子转移效应,抑制ZnO中光生电子空穴对的复合,提高了ZnO的可见光催化性能;考察了复合材料在模拟太阳光条件下降解亚甲基蓝的光催化性能,当GO添加量为10%时,模拟太阳光照射90 min后,对亚甲基蓝的降解率达到97.2%,经过10次循环使用后降解率没有明显降低,复合材料的可见光催化活性明显优于纯的纳米ZnO,同时ZnO/GO复合材料对部分工业染料也有很好的降解活性。 相似文献
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分别采用硫酸、盐酸和硝酸对尿素热解得到的体相块状石墨相氮化碳(g-C_3N_4)进行质子化改性,超声剥离得到氮化碳纳米片,考察3种质子化氮化碳纳米片对亚甲基蓝染料的光催化降解性能,利用XRD、FT-IR、SEM、BET、UV-DRS、UV-VIS等对其结构、形貌、比表面积、禁带宽度进行分析。结果表明,硫酸改性后的g-C_3N_4比表面积最大(60. 9 m~2·g~(-1)),亚甲基蓝降解效果最好,降解率为46. 7%,相比于体相块状g-C_3N_4的29. 2%提高了17. 5个百分点。以硫酸质子化改性的g-C_3N_4为前驱体,采用搅拌法制备得到质子化g-C_3N_4/石墨烯复合材料,其光催化降解亚甲基蓝的降解率为81. 7%,较硫酸质子化g-C_3N_4提高了35. 0个百分点。 相似文献
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纳米BiVO_4的制备表征及光催化性能研究 总被引:2,自引:0,他引:2
以十二烷基苯磺酸钠(SDBS)为分散剂,采用水热合成法制备了纳米钒酸铋,采用红外光谱(FT-IR)、X射线衍射(XRD)、扫描电子显微镜(SEM)和紫外-可见光(UV-Vis)吸收光谱进行了结构表征.通过模型化合物亚甲基蓝的降解脱色实验研究了其光催化活性,考察了亚甲基蓝初始浓度、催化剂加量、pH等因素对降解率影响.结果表明,纳米BiVO4在可见光照射下具有良好的光催化性能,450 W高压汞灯光照2.0 h,可使浓度为10 mg/L亚甲基蓝溶液的降解率达90%.在环境水污染治理中有良好的应用前景. 相似文献
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本文研究了β_2-SiW_(11)Mn/TiO_2光催化剂对于亚甲基蓝染料降解的影响。当染料为亚甲基蓝初始浓度10 mg/L、溶液体系pH值为2,光催化剂用量为5 mg,放置于紫外光条件下持续照射200 min,目标染料亚甲基蓝降解率可达86.5%,而在太阳光照射的条件下,其降解率高达89.3%。 相似文献
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利用醋酸锌为原料,采用溶胶-凝胶法制备了单壁碳纳米管(SWMTs)和氧化锌的纳米复合物(ZnO/SWNTs)。用X射线衍射光谱(XRD)、拉曼光谱、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、热重分析(TGA)、傅里叶变换红外光谱(FT-IR)以及紫外-可见吸收光谱(UV-Vis)对复合物进行了表征。结果显示,粒径为10~20 nm的ZnO粒子均匀地负载在SWNTs表面,且在可见光区具有很好的光吸收性能。研究了ZnO/SWNTs光催化剂在太阳光照射下对甲基橙和亚甲基蓝的光催化降解情况。结果表明,复合物的催化活性明显高于ZnO。对于甲基橙,光照200 min后,降解率为99.8%,是纯ZnO(4.8%)的20倍;对于亚甲基蓝,仅光照20 min,降解率就达到了98.4%,是纯ZnO(4.0%)的25倍。 相似文献
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采用溶胶-凝胶法将ZnO掺杂进荧光粉/TiO_2体系,并以活性炭纤维(ACF)为载体,制备了Pr~(3+)∶Y_2SiO_5/ZnO-TiO_2/ACF复合材料。采用XRD、SEM、EDS、FS和UV-vis DRS,对材料的结构及性能进行了表征,并以亚甲基蓝为模拟降解物,考察了ZnO掺杂量对复合材料可见光催化性能的影响。结果表明,当ZnO掺杂质量为TiO_2质量的10%时,制得的复合材料光催化性能最强,在500 mL质量浓度为15 mg/L的亚甲基蓝溶液中反应12 h后亚甲基蓝去除率高达98.0%,反应符合拟一级动力学方程,反应速率常数为0.341 3 h~(-1),是未掺杂ZnO的Pr~(3+)∶Y_2SiO_5/TiO_2/ACF的1.75倍,复合材料重复使用4次后亚甲基蓝去除率仍然保持在85%以上。 相似文献
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R. Nirmala Hak Yong Kim R. Navamathavan Chaun Yi Jeong Jin Won Kyungsoo Jeon Ayman Yousef R. Afeesh Mohamed El-Newehy 《Ceramics International》2012,38(6):4533-4540
SnO2 doped TiO2 electropsun nanofiber photocatalysts were successfully prepared by means of electrospinning process. The surface morphology, structure and optical properties of the resultant products were characterized by field-emission electron microscopy (FE-SEM), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), UV–vis spectroscopy, photoluminescence (PL) and cathodoluminescence (CL) techniques. The utilized physiochemical analyses indicated that the introduced SnO2 doped TiO2 nanofibers have a smooth surface and uniform diameters along their lengths. The photocatalytic performance of the composite nanofibers was tested for degradation of methylene blue (MB) and methyl orange (MO) dye solution under ultraviolet (UV) irradiation. Under the UV irradiation, the photocatalytic reaction rate in case of utilizing SnO2-doped TiO2 nanofibers was rapidly increased than that of the pristine TiO2 nanofibers. Overall, this study demonstrates cheap, stable and effective material for photocatalytic degradation at room temperature. 相似文献
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The aim of this research is to investigate the possibility of barrier effect of poly(vinyl alcohol) (PVA)/montmorillonite (MMT) nanofiber, against the UV radiation in different electrospinning situations. For this purpose, nanofibers with different weight ratio of PVA and nanoclay (MMT) were electrospun under different circumstances, and the amount of protect that is created by the nanofiber web against UV radiation by examining the rate of degradation of methylene blue dye that was protected by the same web was estimated. The UV-vis spectrometry was used for the analysis of methylene blue color. In order to investigate the morphology and miscibility of PVA-MMT composite nanofiber, X-ray diffraction, scanning election microscope, and Fourier transform infrared spectrometer have been used. Thermal gravimetric analysis is used to investigate and explore how nanofibers behave against heat. 相似文献
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传统的静电纺丝法使用单一的毛细管状喷头喷丝,通常用于制备实心且表面光滑单一组分的纳米纤维,无法得到具有多种功能性结构的复合材料,应用范围较窄。以酞酸丁酯和尿素为原料,采用同轴静电纺丝法成功制备了TiO2/g-C3N4复合材料,并用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、紫外可见漫反射光谱(UV-vis DRS)、场发射扫描电子显微镜(SEM)和Brunauer-Emmett-Teller (BET)分析对样品进行了表征,通过光催化降解亚甲基蓝溶液(MB)研究了不同g-C3N4添加量对TiO2/g-C3N4复合材料光催化性能的影响。实验结果表明,采用同轴静电纺丝法结合500℃煅烧工艺成功制备了大比表面积及高光催化性能的TiO2/g-C3N4复合材料。当g-C3N4添加量为0.15 g时,TiO2/g-C3N4复合材料对亚甲基蓝溶液(MB)的光催化降解效率可达93.8%,且经过5次重复实验后降解率仍可达80%以上。 相似文献
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Seongpil An Min Wook Lee Bhavana N. Joshi Ayeong Jo Jinho Jung Sam S. Yoon 《Ceramics International》2014
Highly photocatalytic water purification three-dimensional nanofiber membranes were fabricated. We identified the optimal fabrication process of nylon-6 nanofiber membranes suspending titania nanoparticles for potential water purifications and toxicity control of chlorophenols. Nanofibers and nanoparticles were deposited on a soda lime glass substrate by electrospinning and electrospraying, respectively. Titania nanoparticles were used to induce the UV light driven photocatalytic effect and nanofibers were used to tightly suspend the nanoparticles in air. Both batch and continuous deposition processes were introduced in the membrane fabrication process and their water purification performances were compared and quantified using a methylene blue solution, which is often used as a model pollutant. Surface morphologies and characteristics of the membranes fabricated at various process conditions were also provided. The membrane fabricated by the continuous means yielded 100% degradation of the methylene blue solution within 90 min under a relatively weak UV irradiation (0.6 mW/cm2), which promises its potential indoor application. The nano-textured membranes developed in this work was also applied to the real pollutants, such as chlorophenols, and showed a promising performance in their toxicity control. 相似文献
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A novel photocatalyst, nano-sized zinc and cobalt phthalocyanines (MPc), are anchored on polyacrylonitrile (PAN) nanofibers in the presence or absence of TiO2 and the process was realized with an innovative solution blow spinning (SBS) method for the first time. Novel nanofiber composites were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy techniques. According to the SEM micrographs, the immobilization of nano-Pcs on the surface of PAN nanofibers was uniform and does not involve agglomeration. The MPc/PAN composite yielded nearly complete degradation of methylene blue (MB) of a highly photocatalytic nature. It was also found that the presence of TiO2 on MPc/PAN composite have no effect on photodegradation of MB. Also, the recycling of new photocatalysts required as little change as possible owing to their macroscopic structure and their flexible nature. 相似文献
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纳米TiO2材料在光催化、抗菌等方面有着广泛应用。采用尺寸为20~30nm的TiO2颗粒与聚乙烯吡咯烷酮(PVP)的醇溶液混合制得纺丝液,通过静电纺丝技术与烧结工艺,制得TiO2纳米纤维。采用能谱仪、X射线衍射、扫描电子显微镜和投射电子显微镜等分析手段对样品进行了表征,与采用溶胶–凝胶结合静电纺丝技术得到的TiO2纳米纤维进行了形貌对比,并通过亚甲基蓝降解实验研究其光催化性能。结果表明:以TiO2纳米颗粒为原料通过静电纺丝技术制备的TiO2纳米纤维,主要为多晶相的锐钛矿结构,直径为150~250 nm,长度大于20μm,与溶胶–凝胶结合静电纺丝技术制得的TiO2纳米纤维相比,直径分布更为均匀。在紫外光照射90min时,对浓度为4mg/L的亚甲基蓝溶液的分解率为72%,具有较好的光催化效率。 相似文献
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Magnetic‐field‐assisted electrospinning highly aligned composite nanofibers containing well‐aligned multiwalled carbon nanotubes
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Composite nanofiber meshes of well‐aligned polyacrylonitrile (PAN)/polyvinylpyrrolidone (PVP) nanofibers containing multiwalled carbon nanotubes (MWCNTs) were successfully fabricated by a magnetic‐field‐assisted electrospinning (MFAES) technology, which was confirmed to be a favorable method for preparation of aligned composite nanofibers in this article. The MFAES experiments showed that the diameters of composite nanofibers decreased first and then increased with the increase of voltage and MWCNTs content. With the increase of voltage, the degree of alignment of the composite nanofibers decreased, whereas it increased with increasing MWCNTs concentration. Transmission electron microscopy observation showed that MWCNTs were parallel and oriented along the axes of the nanofibers under the low concentration. A maximum enhancement of 178% in tensile strength was manifested by adding 2 wt % MWCNTs in well‐aligned composite nanofibers. In addition, the storage modulus of PAN/PVP/MWCNTs composite nanofibers was significantly higher than that of the PAN/PVP nanofibers. Besides, due to the highly ordered alignment structure, the composite nanofiber meshes showed large anisotropic surface resistance, that is, the surface resistance of the composite nanofiber films along the fiber axis was about 10 times smaller than that perpendicular to the axis direction. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41995. 相似文献
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Muzafar A. Kanjwal Nasser A. M. Barakat Faheem A. Sheikh Myung Seob Khil Hak Yong Kim 《International Journal of Applied Ceramic Technology》2010,7(Z1):E54-E63
In the present study, we are introducing silver-doped titanium oxide nanofibers produced by electrospinning technique. Calcination of dry nanofiber mats consisting of silver nitrate–titanium isopropoxide/PVAc in air at 600°C for 1 h leads to produce Ag-doped titania nanofibers. Two dyes have been invoked to check the photocatalytic ability of the produced nanofibers; methylene blue dihydrate and methyl red. The obtained results indicated that the silver-doped titanium oxide nanofibers can eliminate >92% of the methylene blue dye within 10 min only. In a case of methyl red, almost the dye was decayed (93%) within 3 h. 相似文献