Adsorption of BSA on carbon-coated Fe<Subscript>3</Subscript>O<Subscript>4</Subscript> microspheres activated with 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride

Carbon-coated Fe₃O₄ (Fe₃O₄/C) microspheres activated with 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (EDC) were prepared, characterized and applied to adsorb bovine serum albumin (BSA). The prepared magnetic microspheres had spherical core-shell structure with a uniform and continuous carbon coating coupled with activation by EDC, and possessed superparamagnetic characteristics. The experimental results showed that the adsorption amount of BSA on the EDC-activated Fe₃O₄/C (Fe₃O₄/C-EDC) microspheres was higher than that on the Fe₃O₄/C microspheres. The maximum adsorption of BSA on Fe₃O₄/C-EDC microspheres occurred at pH 4.7, which was the isoelectric point of BSA. At low concentrations (below 1.0 M), salt had no noticeable effect on BSA adsorption. The BSA adsorption of Fe₃O₄/C-EDC microspheres had a better fit to the Langmuir model than the Freundlich isotherm and Temkin isotherm model, and the kinetic data were well described by the pseudo-second-order model. The adsorption equilibrium could be reached within 20 min. High desorption efficiency (97.6%) of BSA from Fe₃O₄/C-EDC microspheres was obtained with 0.5 M Na₂HPO₄ (pH 9.4) as the desorbent.     

功能化Fe_3O_4对水中亚甲基蓝染料的吸附性能研究

通过共沉淀法制备了磁性Fe_3O_4纳米粒子,并将其表面包覆二氧化硅外壳,制备了性质稳定,脱色性能较好,同时易于固液分离的功能化磁性纳米粒子.以模拟印染废水的脱色为目标,研究了pH、温度、吸附时间等因素对脱色效果的影响.研究结果表明,磁性吸附剂制备成本低,对亚甲基蓝溶液的脱色效率显著.     

Magnetically Recoverable PEI/Titanate@Fe_3O_4 Photocatalysts: Fabrication and Photocatalytic Properties

The magnetically separable ternary polyetherimide/titanate@Fe_3 O_4(PTF) photocatalysts of special heterostructure between magnetite(Fe_3 O_4) microspheres and titanates nanosheets modified by polyetherimide(PEI) were successfully fabricated via a simple facile hydrothermal deposition method. The as-prepared photocatalysts were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Transmission electron microscopy and UV-vis diffuse reflectance spectroscopy etc. The results showed that the as-fabricated material had a structure of Fe_3 O_4 microspheres coated with titanates nanosheets modified by PEI. The special interfacial contact between 3 D microsphere and 2 D nanosheets in the nanoarchitectures was formed via electrostatic attraction. Furthermore, the resulted photocatalysts were tested by degradation reaction of methylene blue under visible light irradiation and demonstrated an enhanced performance than the pure Fe_3 O_4 microspheres, and the photocatalytic activity enhanced with the molar ratio of Fe_3 O_4 microspheres and modified titanate gradually, which was attributed to the expansion of the surface area and the different electrostatic contact between the Fe_3 O_4 microspheres and titanate nanosheets. Moreover, the obtained results revealed the high yield magnetic separation and efficient reusability of PTF-5(96.7%) over 3 times reuse.     

Preparation of Magnetic Fluorescent Dual-drug Nanocomposites for Codelivery of Kaempferol and Paclitaxel

Magnetic fluorescent dual-drug nanocomposites(MFDDs) were developed with the aim of simultaneouly delivering two different anticancer drugs, kaempferol(KAE) and paclitaxel(PTX). Firstly, Fe_3O_4/bovine serum albumin(Fe_3O_4/BSA) composite microspheres with physically entrapped KAE were prepared, then microspheres were modified with PTX/graphene quantum dots(PTX/GQDs) through chemically bonding, and the MFDDs were obtained. The properties of nancomposites were characterized by X-ray diffractometry, Fourier-transform infrared spectroscopy, transmission electron microscopy, vibrating sample magnetometry and X-ray fluorescence spectrometry. It was found that the superparamagnetic nanocomposites had ultrafine size(below 110 nm), high saturation magnetization of 24.36 emu/g, and significant fluorescence. Furthermore, the cumulative in vitro release of the MFDDs exhibited controlled drug release. Cell viability experiments confirmed that the co-administration of KAE with PTX had a superior cytotoxicity to the Hela cells compared with single drug-loaded forms. Therefore, dual anticancer drug-loaded MFDDs have the potential to be used for cancer combined chemotherapy.     

Preparation and Characterization of Superparamagnetic Fe_3O_4/CNTs Nanocomposites Dual-drug Carrier

Fe_3O_4/carbon nanotubes(Fe_3O_4/CNTs) nanocomposites were prepared by polylol hightemperature decomposition of the precursor ferric chloride and CNTs in liquid triethylene glycol.After surface modification with hexanediamine,folate was covalently linked to the amine group of magnetic Fe_3O_4/CNTs nanocomposites.The products were characterized by Fourier-transform infrared spectroscopy,transmission electron microscopy,and vibrating sample magnetometry.Then Fe_3O_4/CNTs were used as a dual-drug carrier to co-delivery of the hydrophilic drug epirubicin hydrochloride and hydrophobic drug paclitaxel.The results indicated that the Fe_3O_4/CNTs had a favorable release property for epirubicin and paclitaxel,and thus had potential application in tumor-targeted combination chemotherapy.     

磁性纳米TiO2/Fe3O4复合材料的制备及光催化降解性能

采用均匀沉淀法在Fe3O4表面包覆TiO2,制备新型纳米TiO2/ Fe3O4光催化材料,并通过改变pH值、温度、TiO2/Fe3O4的比例和硫酸钛浓度等得到材料制备的最佳条件.用X射线衍射分析了复合颗粒的形态结构及包覆情况.通过可溶性染料活性艳红X-3B的降解反应,考察了光催化活性.结果表明,用最佳条件制备的复合材料对活性艳红的脱色率达97.12%.光降解动力学结果表明:对活性艳红X-3B染料的光催化降解反应符合一级反应动力学.     

The structure and properties of Fe3O4／P （NaUA-St-BA）magnetic composite nano particles

Fe3O4/P (NaUA-St-BA) core-shell composite micro spheres were in situ prepared by soapless polymerization of styrene and butyl acrylate, with Fe3O4 magnetic colloidal particles coated with NaUA. The results of IR and XRD analysis demonstrated that the desired polymer chains have been covalently bonded to the surface of Fe3O4 nano particles. The morphology analysis by TEM confirmed that the composite particles have the core-shell structure and a relatively uniform diameter of about 100nm. The magnetic properties of the obtained composite latex particles were measured by VSM and found that they exhibited super paramagnetic properties.Finally, the prepared magnetic composite particles latex is stable for several months.     

Facile Fabrication of Fe_2O_3/Nitrogen Deficient g-C_3N_(4-x) Composite Catalysts with Enhanced Photocatalytic Performances

The modification of graphitic carbon nitride can significantly improve the photocatalytic performance of graphitic carbon nitride(g-C_3N_4). Fe_2O_3/nitrogen-deficient g-C_3N_(4-x) composite catalysts were prepared with dicyandiamide as the precursor and Fe~(3+) doped in this study. The composite catalysts were characterized by XRD, SEM, FT-IR, XPS and photocurrent measurements. Close interaction occurred between Fe_2O_3 and nitrogen deficient g-C_3N_(4-x), more photogenerated electrons were created and effectively separated from the holes, resulting in a decrease of photocarrier recombination, and thus enhancing the photocurrent. Photocatalytic performance experiments showed that Fe_2O_3/nitrogen deficient g-C_3N_(4-x) could utilize lowenergy visible light more efficiently than pure g-C_3N_4, and the removal rate was 92% in 60 minutes.     

Fe_3O_4-TiO_2磁性光催化剂的制备与性能

采用化学共沉淀法制备磁性纳米Fe3O4作为磁载体,以溶胶-凝胶法制备了Fe3O4-TiO2磁性光催化剂,采用X射线衍射(XRD)、紫外-可见(UV-Vis)漫反射等手段对其进行表征。以亚甲基蓝水溶液为模拟污染物,测试了Fe3O4-TiO2磁性光催化剂的光催化性能,光照90min后,亚甲基蓝的脱色率可达到96.6%,相同条件下TiO2对亚甲基蓝的脱色率为93.6%。在外加磁场作用下,Fe3O4-TiO2磁性光催化剂的平均回收率为85.6%,TiO2离心分离平均回收率为62.7%,Fe3O4-TiO2磁性光催化剂在保证高催化活性的前提下实现了高效回收。     

Effect of Al_2O_3 on the Process Performance of ZrO_2 Microspheres

Al_2O_3-ZrO_2 microspheres were prepared by internal gelation method.The effects of Al~(3+) on the stability of solution and performance of gel spheres were studied.Al~(3+) had a great influence on the stability of the solutions,and the more of the amount of Al~(3+),the shorter of the stabilization time.Because Al~(3+) did not copolymerize with Zr~(4+) during the sol-gel transformation,the strength of gel sphere added with Al~(3+) was low and deformed easily as it was squeezed.The results of our experiments well verify Glasser team's speculation and conclusions.At the same time,based on the experimental results,we prepared Al_2O_3-ZrO_(2 )composite microspheres with higher content of Al_2O_3 by controlling the pH of the solution.The change curve of viscosity with time and the stabilization time of the solution with different Al~(3+) dosage were given,which could provide references for industrial mass production.Samples without hydrothermal treatment cracked severely,while the samples hydrothermally treated kept structural integrity with no cracks after calcined.Al_2O_3-ZrO_(2 )microspheres with no segregation and phase separation were prepared and alumina evenly distributed in the zirconia matrix.When the content of Al_2O_(3 )was low,the tetragonal phase was stable.And the cubic phase was obtained when the content of Al_2O_3 was more.     

改性活性炭对2,4,6-三氯酚的吸附

比较研究了5种活性炭(GACO、GACH、GACF、GACF1M1、GACF1M3)对2,4,6-三氯酚(2,4,6-TCP)的去除效果,发现GACF1M3有最佳的TCP吸附能力;5种活性炭对TCP的吸附容量分别为160、178、207、194和238 mg/g.着重研究了GACF1M3对TCP的吸附过程.随着TCP初始浓度的增加,TCP的吸附量也相应增加;温度的改变,会影响TCP的去除率,温度从30℃增加到45℃时,相同条件下的TCP的去除率稍有下降;活性炭的投加量对TCP的去除也有较明显的影响,投加量从10 mg到500 mg,TCP的去除效果明显增强.微酸性的Ph值,有利于GACF1M3吸附TCP.在反应动力学的研究中,拟二级反应动力学能较好的模拟反应过程.通过扫描电镜及X射线衍射实验,观察GACF1M3的表面形貌并确定表面负载金属化合物的主要成分为Fe_3O_4、Mn_3O_4、FeO_xMnO_((1-x)).     

铁铝复合吸附剂去除水中痕量磷效能及机理

考察了铁铝复合吸附剂去除水中痕量磷的效能,并采用粒度分析、Zeta电位测定及能谱分析等手段对其吸附除磷机理进行探讨.结果表明,该吸附剂具有高效吸附除磷效能,明显优于同等条件下Fe₂O₃和活性氧化铝(γ-Al₂O₃),初始ρ(PO₄^3--P)=0.3 mg/L时,其吸附容量比Fe₂O₃和γ-Al₂O₃分别提高了近1.5倍和2.5倍,该吸附剂具备超细粉体的特征,比表面积达184.45 m²/g,是Fe₂O₃的9.15倍,Al元素的嵌入、制备过程中,研磨粉碎导致的晶格错位及微晶化是其对磷高效吸附的一个主要原因.其0电荷点为6.2,水处理过程中.在吸附剂表面同时存在非特性吸附和强特性吸附是其对磷高效吸附的另一个主要原因.     

羧基修饰的吸附树脂对1,2-苯并异噻唑-3-酮(BIT)的吸附研究

采用偏苯三甲酸酐、均苯四甲酸酐修饰氯甲基化的低交联大孔聚苯乙烯-二乙烯苯制备的超高交联吸附树脂(分别命名为ZT3和ZT4),通过比表面及孔径分析对其结构进行表征。以Amberlite XAD-4树脂作参照,通过等温吸附实验和吸附动力学实验探讨了修饰后的树脂对水溶液中BIT的吸附性能和机理。结果表明:ZT3、ZT4修饰的树脂比Amberlite XAD-4树脂对水溶液中BIT具有更好的吸附效果,这主要归因于树脂的微孔面积、高比表面积和树脂表面的羧基,Langmuir和Freundlich方程均能较好拟合修饰树脂对BIT的吸附等温线。BIT在ZT3和ZT4树脂上的吸附量都是随着溶液pH的增大而减小。     

含氧化铁粉粒状脱硫剂的脱硫性能研究

干法脱硫由于其脱硫剂利用率低而未达到广泛的应用．为研究高效的干法脱硫剂．在干法粒状脱硫剂中加入金属氧化物Fe2O3作为催化剂．通过实验确定直径、蒸汽活化、加湿和加入Fe2O3粉对脱硫剂脱硫速率及钙利用率的影响．从而确定Fe2O3粉的催化性能并初步分析其催化机理．由曲线图中曲线对比可得。Fe2O3粉的催化性能与其投加量有关。少量Fe2O3粉与过量Fe2O3粉对反应的促进作用不明显。所以存在最佳的添加量。由实验可得其最佳添加量在总质量的1．5％～6％之间．     

高温固相法制备LiFePO4／C正极材料及其性能研究

以Fe2O3,LiH2PO4,乙炔黑和蔗糖为原料,采用高温固相合成方法制备LiFePO4／C复合正极材料。利用X射线衍射（XRD）、扫描电镜（SEM）和电化学测试等方法对合成材料的结构、形貌以及电化学性能进行表征。结果表明,合成材料为单一晶相正交晶系结构,在电压为2．50～4．20V（vs．Li^＋／Li）,以0．1mA／cm^2电流密度下经恒电流充放电测试,其首次放电比容量为156．3mAh／g,经过30周充放电循环后放电比容量为157．7mAh／g,表现出较大的初始放电比容量和优异的循环性能。     

改性聚苯乙烯微球对蛋白质的吸附与解吸特性

通过蒸馏-沉淀法制备单分散的聚苯乙烯（PS）微球,并用两亲性聚合物聚乙二醇（PEG）对PS进行修饰．以牛血清蛋白（BSA）为模型,研究PS-PEG微球对BSA的吸附与解吸特性．结果表明,聚合物微球对BSA的吸附受pH、微球上PEG含量以及NaCl溶液质量浓度的影响,作用力为疏水吸附．在无盐水体系下解吸,解吸率最高为96．2％,表明微球在蛋白质分离应用中可重复使用．     

陶瓷基复合材料(Fe3Al/Al2O3)设计专家系统原型的研究与实现

本文简要介绍了材料设计的意义和Fe3Al／Al2O3陶瓷复合材料的性能特点，重点阐述了Fe3Al/Al2O3陶瓷复合材料设计专家系统的组成及实现。     

纳米TiO2/矿物复合光催化降解染料废水研究

直接热舍Fe2O3制备纳米TiO2／高岭石复合光催化材料。用XRD、FYIR、Raman技术对材料的晶体结构和分子结构进行表征分析。偶氮染料废水初始浓度40mg／L，催化剂添加量2g／100mL废水，废水初始pH=4，紫外光和太阳光下6h后偶氮废水降解脱色率分别为98．4％和62．5％。     

天然锰矿对水体中磷的去除研究

研究了天然锰矿对水体中磷的去除效果,考察了温度、光照、锰矿用量、溶液pH及共存离子对除磷效果的影响。结果表明,pH对磷的吸附影响很大。离子影响中,Ca2+、Mg2+、CO32-、HCO3-、SiO32-和SO24-的影响不大,而AsO43-和AsO3-却能明显抑制锰矿对磷的吸附。Freundlich等温吸附模型(r2=0.984 4)能很好的描述磷的吸附。动力学数据符合二级动力学模型(r2=0.999 9),最大吸附量为30.40μg/g。FTIR和SEM结果显示磷主要是通过与锰矿表面的羟基发生置换或生成内层络合物而被吸附。天然锰矿,具有较大的比表面积,强选择性,是一种很有前景的去除天然水体中磷的吸附剂。     

焙烧态MgAl-CO3双羟基层状金属化合物去除水中痕量高氯酸盐

用共沉淀法制备了不同配比的MgAl-CO3双羟基层状金属化合物,焙烧后制得焙烧态水滑石。考察了MgAl-CO3双羟基层状金属化合物及其焙烧产物对水中痕量高氯酸根离子的吸附性能,研究了初始浓度、pH值、温度、粒径、共存阴离子等对去除效能的影响,计算得到了有关动力学参数。结果表明:550℃焙烧态水滑石(n(Mg2+)/n(Al3+)=3)对ClO4-的吸附效果最好,且符合准二级反应动力学方程和Freundlich等温吸附模型。焙烧态水滑石对溶液的pH值具有一定的缓冲作用,在较宽的pH范围均可广泛应用。但是在强酸条件下水滑石会发生溶解;强碱条件下OH-会与ClO4-形成吸附竞争。