SnO_2/BiOI复合材料的制备与光催化性能

用恒温水浴加热法制备了不同物质的量比例的SnO_2/BiOI复合光催化剂。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、紫外-可见漫反射光谱(DRS)和光致发光(PL)光谱等测试手段对产物进行了表征;通过在可见光下降解MB溶液研究SnO_2/BiOI复合材料的光催化性能。n(SnO_2)∶n(BiOI)=7∶3的复合光催化剂(SB-7)的光催化活性最高。光生电子空穴对在SnO_2和BiOI界面间实现了有效分离,因而改善了光催化性能。     

可见光催化剂Bi2WO6的制备及其光催化性能的研究

采用水热合成法在不同温度、不同pH条件下合成了可见光响应的Bi2WO6催化剂,利用XRD、DRS、SEM和UV-vis等技术对其晶型结构、光吸收性能和形貌等进行了表征.以罗丹明B为目标降解物,以氙灯为光源,探讨了不同条件下制备的Bi2WO6的光催化活性.结果表明,在160℃、pH=1条件下制备的催化剂的活性最佳,这与其具有小的粒径、大的比表面积等因素有关.     

BiPO_4光催化剂的制备、表征及其光催化性能

磷酸铋是一种新型半导体光催化剂,PO_4~(3-)的诱导效应有助于电子-空穴对的分离,在提高光催化活性方面有着重要作用。实验以硝酸铋为铋源,磷酸二氢钠提供磷酸根离子,通过水热法合成制备了BiPO_4光催化剂,并且改变水热时间、水热温度、pH和反应溶剂等条件,考察了工艺参数对光催化活性的影响,利用XRD、UV-Vis DRS、PL等手段进行表征。染料模拟废水的净化测试表明,光催化活性最佳合成条件为水热时间6h,水热温度为160℃,pH为2.1,溶剂为水,其中pH和溶剂为合成光催化剂主要的影响因素,暗吸附30min后,在紫外灯照射条件下对活性艳蓝的降解率达到65%。     

PVP辅助EG溶剂热法制备BiOI微米球技术

以聚乙烯吡咯烷酮（PVP）为表面活性剂,采用乙二醇（EG）溶剂热法在120℃合成了碘氧化铋（BiOI）纳米片组装的微结构。分析了样品的形貌、晶体结构、晶体生长方向和紫外-可见吸收光谱特征,探讨了溶剂组成对BiOI形貌的影响。研究结果表明,所制备的BiOI微米球尺寸均匀,形貌结构丰富,且具有良好的结晶性;PVP的加入可以使晶体的形貌和生长方向得到有效调控。同时,由于晶体的尺寸显著降低,导致紫外-可见吸收光谱的吸收边发生蓝移。     

Gd掺杂BiVO4纳米粉体的制备及其光催化性能

采用水热法制备了单斜相白钨矿结构的Gd掺杂BiVO4粉体。采用X-射线粉末衍射、扫描电子显微镜和紫外一可见吸收光谱对样品进行表征。研究了不同浓度Gd掺杂BiVO4纳米粉体的晶相组成、形貌和光催化性能的影响。结果表明,Gd掺杂BiVOt粉体在可见光下的催化活性优于纯相BiVO4粉体,Gd掺杂量为2％的样品对罗丹明B催化效果最佳,在100min内对罗丹明B溶液的分解率达98％。     

不同形貌的 ZnO的制备及其可见光催化降解性能研究

采用Zn-EG/H2 O-AC体系,即以醋酸锌为原材料,乙二醇/水为溶剂,加入聚乙二醇-2000,溶剂热法制备了四种形貌的ZnO可见光催化材料。探索了乙二醇与水的体积比 n对ZnO的形貌的影响,并以罗丹明B（RhB）模拟有机物染料,研究了不同形貌的ZnO在可见光下的催化降解性能。实验结果表明,当n＝5为中空球状ZnO催化活性最好,n＝11为双蘑菇状,n＝2为瓜子状,n＝0．5时为子弹头状,其在可见光下照射3 h ,对RhB催化降解率分别为100％、83％、55％、60％。     

不同形貌的ZnO的制备及其可见光催化降解性能研究

采用Zn-EG/H2O-AC体系,即以醋酸锌为原材料,乙二醇/水为溶剂,加入聚乙二醇-2000,溶剂热法制备了四种形貌的ZnO可见光催化材料。探索了乙二醇与水的体积比n对ZnO的形貌的影响,并以罗丹明B(RhB)模拟有机物染料,研究了不同形貌的ZnO在可见光下的催化降解性能。实验结果表明,当n=5为中空球状ZnO催化活性最好,n=11为双蘑菇状,n=2为瓜子状,n=0.5时为子弹头状,其在可见光下照射3h,对RhB催化降解率分别为100%、83%、55%、60%。     

BiOI/g-C3N4光催化剂的制备及其性能

采用溶剂热法制备BiOI微米花球,用研磨法制备一系列不同质量比的BiOI/g-C₃N₄复合材料。利用X射线衍射仪、扫描电子显微镜、紫外-可见漫反射光谱仪和光电化学测试等对样品的形貌结构和光学性能进行了系统表征,并研究了在可见光照射下BiOI/g-C₃N₄降解染料罗丹明B的光催化性能。结果表明,BiOI/g-C₃N₄-9复合样品表现出最好的光催化效果,在20 min内其对罗丹明B的降解率可达到95%。光催化降解性能的提高主要由于形成的异质结能够有效增强光生电子-空穴对的分离效率。循环实验表明BiOI/g-C₃N₄复合材料具有良好的光催化稳定性。     

纳米钒酸铋的水热合成及其可见光光催化降解罗丹明B

以Bi(NO3)3·5H2O和NH4VO3为原料,采用水热法合成了BiVO4纳米颗粒,X射线衍射(XRD)表征结果显示所制备的BiVO4颗粒为单斜晶结构.紫外-可见漫反射(DRS)测定结果表明,BiVO4的禁带宽度为2.46 eV.以罗丹明B为目标降解物,研究了样品在可见光下的光催化性能,最佳反应条件为:罗丹明B的初始...     

微波水热法制备含氟钛酸铋系光催化剂及光催化性能研究

以Bi(NO3)3·5H2O和(NH4)2TiF6为原料,采用微波水热法在120℃~220℃反应1h得到了具有不同形貌的粉体.借助XRD、FE-SEM和EDS等分析手段对粉体的组成和形貌进行了表征,并以罗丹明B溶液为目标降解物,研究了200℃下所得粉体的光催化性能.结果表明:所得粉体是一种新型的F掺杂钛酸铋粉体,其中Bi、Ti、O、F的原子比例约为6∶11∶27∶8;随着反应温度的升高,粉体形貌从球形向六棱短柱状转变;紫外光照射下粉体具有较好的降解罗丹明B溶液的能力.     

铋掺杂磁性光催化剂的制备及其光催化活性

以Fe3O4/SiO2复合微球为基体,采用溶胶—凝胶法制备了Bi掺杂的磁性TiO2复合光催化剂,并用SEM、FT—IR和VSM等测试手段对催化剂进行了表征。以活性艳红K-2BP为目标降解物评价其光催化活性。结果表明,制备的复合光催化剂易于磁性固液分离,K-2BP溶液初始浓度为20 mg/L,pH值为2,光催化剂的添加量为0.5 g/L,Bi摩尔分数为0.6%的光催化剂时的催化活性最高,光催化反应5 h后K-2BP的降解率达到88.38%。     

浸渍法制备La/TiO2光催化剂及其光催化活性的研究

作为一种环保、高效的光催化剂,TiO2具有高稳定性、耐腐蚀、对人体无害、高催化性能等特点,因而成为一种具有发展前景的材料[1-2].目前,该材料已被广泛用于净化空气、废水处理、抗菌和表面自清洁材料等方面[3].但是,TiO2本身存在光吸收范围窄(主要限于紫外光区)、光生电子-空穴     

Preparation and photocatalytic performance of ZnO/ZnGa_2O_4 composite microspheres

ZnO/ZnGa_2O_4 composite microspheres with heterojunction were successfully synthesized by one-pot hydrothermal method.These samples were characterized by TG/DTA,XRD,TEM,HRTEM,UV-vis DRS,FL and BET techniques.The results indicated the as-prepared samples showed better degree of crystalline and large specific surface area.The photocatalytic activity was evaluated by degradation of methyl orange with the concentration of 50 mg/L under the irradiation of simulated sunlight.The effects of molar ratio of Zn to Ga and calcination temperature on the photocatalytic activity were investigated in detail.The results showed that the highest photocatalytic degradation efficiency was observed at the molar ratio of Zn to Ga of 1:0.5 in the starting materials and the calcination temperature of 400 °C.The maximum photocatalytic degradation rate of MO was 97.1% within 60 min under the simulated sunlight irradiation,which is greatly higher than that of ZnO and ZnGa_2O_4.     

Ti O2／Si O2复合光催化剂制备工艺参数优化及其表征

先以无机钛盐、硅酸盐为原料制取聚合硅酸硫酸钛,再通过液相水解法制得TiO2/SiO2复合光催化剂,并用SE M、X R D、BE T和甲基橙脱色率对复合光催化剂进行表征. 结果表明,TiO2/SiO2复合光催化剂制备优化工艺参数为：Ti（S O4）2作钛源、Ti/Si摩尔比为12 ： 1、水解反应p H值为6、煅烧温度为650oС,以此条件制备的复合光催化剂对甲基橙脱色率可达98 .6 %以上;TiO2/SiO2复合光催化剂为一种分散均匀的纳米级球形颗粒,其成分为以锐钛矿为主的TiO2,SiO2的复合有效抑制了TiO2晶粒的生长,同时提高了TiO2的热稳定性.     

Preparation and properties of gelatin-chitosan/montmorillonite drug-loaded microspheres

A kind of slow release drug-loaded microspheres were prepared with gelatin, chitosan and montmorillonite(MMT) by an emulsification/chemical cross-linking method using glutaraldehyde as cross-linking agent and acyclovir as model drug. The microspheres were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and scanning electron microscopy (SEM), respectively. The morphology, drug content, encapsulation efficiency and drug-release behavior were investigated with different MMT content...     

Preparation and photocatalytic properties of Fe-doped TiO_2 nanoparticles

1　INTRODUCTIONAsagoodphotocatalyst ,TiO2 hasattractedex tensiveinterestduetoitsvariousexceedingpropertieswithalargesurfacearea ,nontoxicity ,highstability ,lowcost ,andhighcatalysisforchemicalwastetreat ment[1] .PhotocatalyticreactionsoccuronthesurfaceofTiO2 particles .Whenaphotonwithenergyhve qualtoorexceedingtheTiO2 energygap(Eg =3.2eV ,λ=387nm)isabsorbedbyaTiO2 particle ,electron holepairswillbegenerated ,whichcanre duceandoxidatethepollutantsinbothwaterandair .Itisgenerallybelie…     

Preparation and Properties of BiOI with High Sorption Capacity

BiOI nanosheets with high sorption capacity were successfully prepared by the simple hydrothermal method followed by calcination.The features of the as-obtained BiOI nanosheets were characterized by X-ray diffraction (XRD),Fourier transform infrared spectra (FT-IR),thermogravimetric analysis (TGA),scanning electron microscopy (SEM) and specific surface area analyzer (BET).BiOI was used as an adsorbent to explore its sorption properties of benzidine by changing initial concentration,pH and time.Results showed that BiOI had high sorption activity for benzidine,and it was found that the BiOI in this paper exhibited higher sorption capacity than traditional BiOI,which could be mainly attributed to the large specific surface area of the sample and the existence of unsaturated sites in the sample.Meanwhile,the optimal sorption conditions were explored,the actual maximum sorption capacity of BiOI could reach 66.67 mg/g.In addition,the synthesized sample’s reusability without obvious deterioration in performance was demonstrated by five cycles.The sorption process was in accordance with the Langmuir model and the pseudo-second-order kinetic model.     

羟丙基壳聚糖-胰岛素微球的制备及性能

以壳聚糖和环氧丙烷为原料合成了羟丙基壳聚糖,并以此为壳材,以胰岛素为芯材,制备了平均粒径为13．34μm的微球,并通过红外光谱、DSC和扫描电子显微镜对产物的结构进行了表征．结果发现,当搅拌速度为400r／min,HPCS的用量为叫（HPCS）-8％,交联剂戊二醛的体积分数Ф=0．25％（对液体石蜡）时,所制备的微球表面光滑、致密、平均粒径适中,且其包埋率较高,室温下稳定．     

林可霉素A分子印迹聚合物微球的制备及性能

为提高林可霉素粗品中A组分的纯度,研究了制备林可霉素A分子印迹聚合物微球的方法及其性能.以聚苯乙烯微球为种球,林可霉素A为模板分子,通过单步溶胀法合成分子印迹聚合物微球;通过静态平衡结合法研究该聚合物的结合特性和分子识别性能.结果表明:分子印迹聚合物对模板分子具有选择性和识别能力,对林可霉素A和林可霉素B的分离因子α为1.27,而非印迹聚合物微球的分离因子α仅为1.02;林可霉素A分子印迹聚合物微球可用于制备林可霉素,并提高其粗品的纯度.