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Effects of surfactants on the combined toxicity of tio_2 nanoparticles and cadmium to Escherichia coli

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Journal of Environmental Sciences 2018年第12期30卷 126-133页

作者： Mei Li Jianchuan Pei Xiaomeng Tang Xiaoli Guo School of Environmental and Resource Sciences Zhejiang A & F University

The combined ecological toxicity of tio2 nanoparticles（nano-tio2） and heavy metals has been paid more attention. As the common pollutants in water environment, surfactants could affect the properties of nanoparticles and heavy metals, and thus further influence the combined toxicity of nano-tio2 and heavy metals. In this study, the effects of sodium dodecyl benzene sulfonate（SDBS） and Tween 80 on the single and combined toxicities of Cd2＋ and nano-tio2 to Escherichia coli（E. coli） were examined, and the underlying influence mechanism was further discussed. The results showed both SDBS and Tween 80 enhanced the toxicity of Cd2＋ to E. coli in varying degrees. The reaction of SDBS and Cd2＋ could increase the outer membrane permeability and the bioavailability of Cd, while Tween 80 itself could enhance the outer membrane permeability. The combined toxicity of nano-tio2 and Cd2＋ to E. coli in absence of surfactant was antagonistic because of the adsorption of Cd2＋ to nanotio2 particles. However, in the presence of SDBS, both SDBS and nano-tio2 influenced the toxicity of Cd2＋ , and also SDBS could adsorb to nano-tio2 by binding to Cd2＋ . The combined toxicity was reduced at Cd2＋ lower than 4 mg/L and enhanced at Cd2＋ higher than 4 mg/L under multiple interactions. Tween 80 enhanced the combined toxicity of nano-tio2 and Cd2＋ by increasing the outer membrane permeability. Our study firstly elucidated the effects of surfactants on the combined toxicity of nano-tio2 and Cd2＋ to bacteria, and the underlying influencing mechanism was proposed.

关键词： nano-tio2 Heavy metal Surfactant Combined toxicity Bacteria

氧化石墨烯与纳米二氧化钛共混改性PES超滤膜的对比分析

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膜科学与技术 2016年第3期36卷 13-20页

作者：赵永军李方李佳峰马春燕东华大学环境科学与工程学院上海201620 国家环境保护纺织工业污染防治工程技术中心上海201620

为了改善膜的分离性能,采用氧化石墨烯(GO)与纳米二氧化钛(nano-tio_2)对聚醚砜(PES)超滤膜进行共混改性,将GO和nano-tio_2单独或按比例添加到PES铸膜液中,分别考察了不同共混改性超滤膜分离性能和抗污染性能,并通过热失重分析仪等表征... 详细信息

为了改善膜的分离性能,采用氧化石墨烯(GO)与纳米二氧化钛(nano-tio_2)对聚醚砜(PES)超滤膜进行共混改性,将GO和nano-tio_2单独或按比例添加到PES铸膜液中,分别考察了不同共混改性超滤膜分离性能和抗污染性能,并通过热失重分析仪等表征手段对膜进行了分析,利用纯水和模拟污染物进行了通量测试。试验结果表明:共混改性后超滤膜热稳定性增强,指状孔道变大,上表面粗糙度减小.通过对比分析,可知GO和nano-tio_2共同共混改性的超滤膜(0.8%GO+0.2%nano-tio_2)性能最优,纯水通量可达260L/(m2·h),相较于纯PES膜,通量增加了52.1%,静态接触角可达54.7°,BSA和SA模拟污染物过滤180min后,膜的稳定通量分别保持在67.8和68.0L/(m2·h)左右,截留率均可达99%以上.

关键词： GO nano-tio2 共混改性超滤膜对比

Study on the Optimal Composition of Chitosan/nano-tio_2 Composite Film and Its Application in the Preservation of Jinqiu Pear

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Agricultural Biotechnology 2015年第3期4卷 20-23,26页

作者： Xiqin TAO Mingli WANG Guizhou Industry Polytechnic College College of Chemical Engineering Guizhou University

Water permeability can be used as a parameter to evaluate the effects of chitosan / nano-tio2 composite film on the preservation of fruits and vegetables. In this study, using water permeability as the objective function, an L9 （3）3 orthogonal experiment was conducted with addition amounts of chitosan, nano-tio2 and glycerin as three factors at three levels. According to the experimental results, when the percentages of chitosan, nano-tio2 and glycerin in chitosan / nano-tio2 composite film was 2%, 0.03% and 2.5%, respectively （ i. e. , there were 2.0 g of chitosan, 0.03 g of nano-tio2 and 2.5 g of glycerin per 1130 g composite film solution）, the water permeability of chitesan / nano-tio2 composite fdm reached the minimum. Chitosan / nano-tio2 composite film prepared with the optimal composition was used for preservation of Jinqiu pear. The water loss rate, respiratory intensity and good fruit rate of preserved Jinqiu pear were determined, which indicated that the prepared chitosan / nano-tio2 composite film exhibited good preservative effects.

关键词： Chitosan nano-tio2 Optimal composition Jinqiu pear Preservation

谷胱甘肽在nano-tio_2-咖啡酸复合修饰碳糊电极上的电催化氧化及电分析方法

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分析测试学报 2011年第8期30卷 897-901页

作者：张艳梅段成茜高作宁宁夏大学化学化工学院能源化工重点实验室宁夏银川750021 宁夏医科大学高等卫生职业技术学院宁夏银川750004

研究了还原型谷胱甘肽(GSH)在nano-tio2-咖啡酸(CFA)复合修饰碳糊电极(nano-tio2-CFA/CPE)上的电催化氧化行为,并进行了测定。结果表明,GSH在CPE和nano-tio2/CPE上的直接电化学氧化过程十分迟缓,nano-tio2-CFA/CPE比CFA/CPE对GSH的电化学氧化具有更好的催化作用。采用循环伏安法(CV)、计时电流法(CA)探讨了GSH在nano-tio2-CFA/CPE上的电极过程动力学性质。用线性扫描伏安法(LSV)测得催化氧化峰电流与GSH的浓度在9.0×10-6～1.0×10-3 mol.L-1范围内呈良好线性,检出限为8.85×10-7 mol.L-1。将该方法用于市售还原型谷胱甘肽药物含量的测定,结果满意。

关键词：谷胱甘肽 nano-tio2 咖啡酸碳糊修饰电极电催化氧化电分析方法

痕量Pb^(2+)在nano-tio_2膜电极上的电化学行为及应用研究

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分析测试学报 2008年第8期27卷 891-894页

作者：王亚珍许江扬江汉大学化学与环境工程学院湖北武汉430056

利用纳米二氧化钛(nano-tio2)的结构特性制备了一种nano-tio2膜修饰的玻碳电极。采用阳极溶出伏安法详细研究了Pb2+在nano-tio2膜修饰玻碳电极上的电化学响应行为,并对各种实验参数进行了优化。实验结果表明,在0.10 mol/L HAc-NaAc缓冲... 详细信息

利用纳米二氧化钛(nano-tio2)的结构特性制备了一种nano-tio2膜修饰的玻碳电极。采用阳极溶出伏安法详细研究了Pb2+在nano-tio2膜修饰玻碳电极上的电化学响应行为,并对各种实验参数进行了优化。实验结果表明,在0.10 mol/L HAc-NaAc缓冲体系(pH 4.0)中,于-1.2 V富集搅拌480 s,再静置60 s后阳极化扫描,Pb2+在-0.48 V左右出现一灵敏的阳极溶出峰。Pb2+的溶出峰电流与其浓度在2.0×10-9~1.0×10-7mol/L范围内呈良好的线性关系,检出限可达1.0×10-10mol/L。该修饰电极具有一定的抗干扰能力,将其应用于实际水样中Pb2+的检测,结果令人满意。

关键词： nano-tio2 化学修饰电极铅离子溶出伏安法

Preparation and characterization of tio_2/acrylic resin composite coatings on sintered NdFeB permanent magnets by electrochemical deposition

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Rare Metals 2014年第6期33卷 703-708页

作者： Zhen-Chen Zhong Ji-Lin Xu Zheng-Xian Huang Jun-Ming Luo School of Materials Science and Engineering Nanchang Hangkong University

The sintered Nd Fe B permanent magnets are widely used in various industries because of their excellent magnetic and comprehensive properties. However, they are seriously hindered to further developments and applications owing to its poor corrosion resistance. In this paper,tio2/acrylic resin composite coatings were successfully prepared on the sintered Nd Fe B permanent magnets by electrochemical deposition for the first time, and the corrosion behaviors were investigated by using immersion testing and potentiodynamic polarization tests. It is found that the coating is a composite, being composed of polymerized acrylic resin as the matrix and nano-rutile tio2particles（-200 nm） as the reinforcements. It is about25 lm in thickness and its surface and cross-section exhibit uniform and smooth with no pores, cracks, and other defects. Compared with those of the uncoated Nd Fe B magnets, the weight loss of the coated samples immersed in H2SO4 solution reduces by two orders of magnitude,corrosion current density decreases by four orders of magnitude, and the corrosion potential of the coated sample is shifted in the noble direction by 400 m V. The mechanisms of corrosive resistance enhancement were discussed.

关键词： NdFeB magnets nano-tio2 Acrylic resin Electrophoretic deposition Corrosion resistance

Polyimide/titanium dioxide self-cleaning nano-hybrid films with high photocatalytic properties

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Progress in Natural Science:Materials International 2023年第5期33卷 674-680页

作者： Ruilai Liu Chang Lu Xiaohong Ding Yunchi Cai Song Liang College of Ecological and Resources Engineering Wuyi University College of Chemistry and Materials Science Fujian Normal University Key Laboratory of nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

Self-cleaning films are considered an emerging paradigm of environmentally functional *** the photocatalytic activities of self-cleaning film is a viable strategy for improving its antifouling *** this work,a polyimide/titanium dioxide(tio2) film(PI/tio2) film was developed by casting a mixture of polyamic acid solution and tio2hydrosol with a subsequent thermal ***2with a concentration of 1,3,and 5 wt% was successfully incorporated into the PI matrix and was equally distributed in nanometer size in the PI/tio2nano-hybrid *** addition of tio2into the film significantly improved its catalytic performance as indicated by the photocatalytic degradation of methylene blue and resazurin solution,suggesting a good selfcleaning property for antifouling *** addition,the thermal and mechanical stability of the PI film were improved with the addition of *** eight cycles,the PI-tio2films also demonstrated excellent cycling *** study introduces a novel self-cleaning film family composed of PI/tio2nano-hybrid film and emphasizes the engineering potential of photocatalytic materials in the context of self-cleaning film.

关键词： Polyimide nano-tio2 Self-cleaning film Photocatalysis Environmental functional materials

纳米二氧化钛的制备及其在环氧树脂改性中的应用

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材料科学与工程学报 2011年第2期29卷 316-320页

作者：刘燕燕吴耀国刘凯于秀菊西北工业大学理学院应用化学系陕西西安710129

nano-tio2粒子具有许多独特的物理和化学性质,在橡胶、塑料和胶粘剂等领域有非常好的应用前景,因而受到广泛关注。综述了近几年nano-tio2制备方法的研究进展,分析对比了溶胶-凝胶法、沉淀法、水解法、水热法和微乳液法等方法的优缺点;... 详细信息

nano-tio2粒子具有许多独特的物理和化学性质,在橡胶、塑料和胶粘剂等领域有非常好的应用前景,因而受到广泛关注。综述了近几年nano-tio2制备方法的研究进展,分析对比了溶胶-凝胶法、沉淀法、水解法、水热法和微乳液法等方法的优缺点;介绍了nano-tio2在环氧树脂(EP)改性中的应用,并展望了其应用前景。

关键词： nano-tio2 制备环氧树脂改性应用

Preparation of solid acid catalyst SO4^2-/tio2/γ-Al2O3 for esterification: A study on catalytic reaction mechanism and kinetics

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Chinese Journal of Chemical Engineering 2019年第11期27卷 2696-2704页

作者： Ying Yuan Wenwei Jiang Jinjin Li School of Chemical Engineering Sichuan UniversityChengdu 610065China

In this work, a series of SO4^2-/tio2/γ-Al2O3 solid acid catalysts were synthesized by impregnation method, in which nano-tio2 was prepared by sol–gel method, and then the nano-tio2 sol was loaded on porous γ-Al2O3 supporter through impregnation. The structure and property of catalyst were characterized by XRD, N2-BET,SEM, TEM, XPS, NH3-TPD, Pyridine-IR and FT-IR. In addition, the catalyst of chelate bidentate coordination acid center model was established. The catalytic performance test was carried out in the esterification of n-butyl alcohol with lauric acid and the catalyst showed excellent activity. The experimental results showed that the medium strength acid sites were more dominant active sites than the strong and weak acid sites for the rapid esterification reaction. Its kinetic behaviors and activation energy were studied for the esterification under the catalytic reaction condition.

关键词： Solid acid catalyst nano-tio2 Esterification Kinetics