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Facile synthesis of α-MnO2 micronests composed of nanowires and their enhanced adsorption to Congo red

Frontiers of Chemical Science and Engineering 2014年第1期8卷 64-72页

作者： Weixin ZHANG School of Chemical Engineering Hefei University of Technology Hefei 230009 China anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering Hefei 230009 China

In this paper, α-MnO2 micronests composed of nanowires were fabricated via a hydrothermal reaction of MnSO4. H20 and K2S208 solutions. The α-MnO2 micron- ests were demonstrated to have a higher adsorption capacity than 7-MnO2 microspheres due to their large specific surface area. The amount of Congo red adsorbed per unit weight of α-MnO2 micronests increased signifi- cantly from 114 to 282mg.g-1 with concentration of Congo red solution increasing from 50 to 200 mg. L-1, but it had a little change with temperature. Kinetics, isotherms and thermodynamics for the adsorption of Congo red on α- MnO2 micronests were examined. The adsorption process followed the pseudo-second-order kinetics with good correlation. The experimental data were analyzed by Langmuir and Freundlich models, and equilibrium data fitted the Langmuir isotherm very well with maximum monolayer adsorption capacity of 625 mg. g-1 at 22 ℃. The adsorption was spontaneous and endothermic accord- ing to thermodynamic studies. The experimental results indicate that α-MnO2 micronests possess a high adsorption capacity and could be employed as a replacement of traditional sorbents.

关键词： MnO2 Congo red adsorption kinetics isotherm thermodynamics

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A chemical etching route to controllable fabrication of TiO2 hollow nanospheres for enhancing their photocatalytic activity

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Frontiers of Chemical Science and Engineering 2013年第2期7卷 192-201页

作者： Weixin ZHANG Jie XING Zeheng YANG Mei KONG Hongxu YAO School of Chemical Engineering Hefei University of Technology Anhui 230009 China anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering Anhui 230009 China

The TiO2 hollow nanospheres with diameters of about 230 nm were prepared by a simple and controllable route based on hydrolysis of Ti（OBu）4 on the surfaces of the Cu20 solid nanospheres followed by inward etching of the Cu20 nanospheres. The as-prepared samples were characterized by X-ray diffraction, transmis- sion electron microscopy and scanning electron micro- scopy. The further post-heat treatment led to the high crystallization of the TiO2 hollow nanospheres. The photocatalytic performances of these samples were evaluated for the photodegradation of rhodamine B （RhB） under UV-light irradiation. The as-prepared TiO2 hollow nanospheres showed higher photocatalytic activity than the CuO and the CuO/TiO2 hollow nanospheres. Effects of temperature and time for post-heat treatment of TiO2 as well as initial RhB concentrations on the RhB photodegradation have also been studied. The results show that the TiO2 hollow nanospheres have the good reusability as photocatalysts and are promising in waste water treatment.

关键词： TiO2 hollow nanospheres rhodamine B,photocatalytic activity

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Nanostructured hollow spheres of hydroxyapatite： preparation and potential application in drug delivery

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Frontiers of Chemical Science and Engineering 2012年第3期6卷 246-252页

作者： Xiaojing ZHANG Weixin ZHANG Zeheng YANG Zhao ZHANG School of Chemical Engineering Hefei University of TechnologyHefei 230009China anhui Key Laboratory of Controllable Chemical Reaction&Material Chemical Engineering Hefei 230009China

A solvothermal method has been successfully used to prepare nanostructured hydroxyapatite （HA） hollow spheres with average diameters of about 500 nm and shell thicknesses of about 100 nm in a glycerin/water mixed solvent. Transmission electron microscopy （TEM） and field-emission scanning electron microscopy （FESEM） images show that the shells of the HA hollow spheres are actually composed of nanosheets with thicknesses of about 10 nm. By tuning the glycerin/water volume ratio, two other kinds of HA solid spheres with average diameters of about 6 or 20 pm were assembled from nanoflakes. The properties of the different kinds of spheres as drug delivery carriers were evaluated. Ibuprofen （IBU） was chosen as the model drug to load into the HA samples. The nanostructured HA samples showed a slow and sustained release of IBU. The HA hollow spheres exhibited a higher drug loading capacity and more favorable release properties than the HA solid spheres and thus are very promising for controlled drug release applications.

关键词： hydroxyapatite hollow spheres synthesis,drug release

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基于铜基底的TiO_2纳米管阵列储锂性能(英文)

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无机化学学报 2013年第8期29卷 1759-1768页

作者：陈公德张卫新杨则恒王强姚宏旭合肥工业大学化工学院可控化学与材料化工安徽省重点实验室合肥230009

研究了基于铜基底的TiO2纳米管阵列直接作为锂离子电池电极的储锂性能。以铜基底上生长的Cu(OH)2纳米棒阵列为模板,采用自牺牲模板法,通过外向包覆与内向刻蚀,制备了非晶态的TiO2纳米管阵列,然后将其在500℃下退火处理4 h,获得锐钛矿型T... 详细信息

研究了基于铜基底的TiO2纳米管阵列直接作为锂离子电池电极的储锂性能。以铜基底上生长的Cu(OH)2纳米棒阵列为模板,采用自牺牲模板法,通过外向包覆与内向刻蚀,制备了非晶态的TiO2纳米管阵列,然后将其在500℃下退火处理4 h,获得锐钛矿型TiO2纳米管阵列。采用X射线衍射、场发射扫描电镜、透射电镜、热重分析对样品进行表征;采用恒电流充放电、循环伏安和交流阻抗谱测试对退火前后TiO2纳米管阵列的电化学性能进行研究。结果表明:与非晶态的TiO2纳米管阵列相比,锐钛矿型TiO2纳米管阵列吸附水的含量低,结晶度高,电荷迁移阻力小,锂离子扩散系数大,结构稳定,具有更好的循环性能和倍率性能;在0.2C下,其首次放电比容量为353 mAh·g-1,经过40次循环后的放电比容量仍为243 mAh·g-1,在8C下的放电比容量为90 mAh·g-1。

关键词： TiO2 纳米管阵列模板负极锂离子电池

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Recovering rare earth elements via immobilized red algae from ammonium-rich wastewater

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Environmental Science and Ecotechnology 2022年第4期12卷 72-80页

作者： Yabo Sun Tao Lu Yali Pan Menghan Shi Dan Ding Zhiwen Ma Jiuyi Liu Yupeng Yuan Ling Fei Yingqiang Sun School of Chemistry&Chemical Engineering School of Material Science&EngineeringAnhui UniversityJiulong Rd 111HefeiAnhui230039PR China Key Laboratory of Structure and Functional Regulation of Hybrid Materials(anhui University) Ministry of EducationHefeiAnhui230601PR China Key Laboratory of Functional Inorganic Material Chemistry of anhui Province Anhui UniversityHefeiAnhui230601PR China Chemical Engineering department University of Louisiana at LafayetteLafayetteLA70504United States

Biotreatment of acidic rare earth mining wastewater via acidophilic living organisms is a promising approach owing to their high tolerance to high concentrations of rare earth elements(REEs);however,simultaneous removal of both REEs and ammonium is generally hindered since most acidophilic organisms are positively ***,immobilization of acidophilic Galdieria sulphuraria(***)by calcium alginate to improve its affinity to positively charged REEs has been used for simultaneous bioremoval of REEs and *** results indicate that 97.19%,96.19%,and 98.87%of La,Y,and Sm,respectively,are removed by *** beads(GS-BDs).The adsorption of REEs by calcium alginate beads(BDs)and GS-BDs is well fitted by both pseudo first-order(PFO)and pseudo second-order(PSO)kinetic models,implying that adsorption of REEs involves both physical adsorption caused by affinity of functional groups such as-COO-and -OH and chemical adsorption based on ion exchange of Ca^(2+) with ***,GS-BDs exhibit high tolerance to La,Y,and Sm with maximum removal efficiencies of 97.9%,96.6%,and 99.1%,***,the ammonium removal efficiency of GS-BDs is higher than that of free *** cells at an initial ammonium concentration of 100 mg L^(-1),while the efficiency decreases when initial concentration of ammonium is higher than 150 mg L^(-1).Last,small size of GS-BDs favors ammonium removal because of their lower mass transfer *** study achieves simultaneous removal of REEs and ammonium from acidic mining drainage,providing a potential strategy for biotreatment of REE tailing wastewater.

关键词： Immobilized algae Galdieria sulphuraria Rare earth elements Deammonification Biotreatment

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