Effects of Surface-Adsorbed Biomolecules and Geomolecules on the Photoreactivity of Metal Oxide Nanomaterials

表面吸附生物分子和地质分子对金属氧化物纳米材料光反应性的影响

• 批准号: 1705511
• 负责人: Stacey Louie
• 金额: $ 29.97万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-07-15 至 2022-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1705511&HistoricalAwards=false
• 关键词: Effects; Surface; Adsorbed; Biomolecules; Geomolecules

Recently, new nanomaterials that can degrade organic pollutants under sunlight irradiation (photoreaction or photocatalysis) have been identified and developed. This unique photoreactivity makes them attractive for applications in diverse water treatment technologies. On the other hand, this property can also correlate to the toxicological hazard of nanomaterials in natural environments. Predicting nanomaterial photoreactivity is challenging in aqueous environments since the surface of the nanomaterial can become coated with a complex mixture of biomolecules and natural organic matter. The interactions of these complex surface coatings with the irradiated nanomaterial and the resulting impact on the effective photoreactivity of the nanomaterial are not yet well understood. A further challenge is to generalize the coating effects across a variety of photocatalytic nanomaterials currently being investigated. Examples of photocatalytic nanomaterials include titanium dioxide, which is activated by ultraviolet light, and novel visible light active nanomaterials, such as molybdenum oxide that could show improved viability for water treatment applications. This research will investigate the mechanisms underlying the formation of complex surface coatings and their effects on the photoreactivity of various metal oxide nanomaterials. The fundamental knowledge and models developed in this research will facilitate the development of effective and safe photocatalytic nanomaterials for environmental applications and alleviate the burden on industry and regulatory agencies for large-scale testing of nanomaterials. The results of this research will be disseminated to the public through a joint program between the University of Houston and local museums called "Unveiling the World of Nanomaterials." This program aims to expose and recruit K-12 students, particularly from underrepresented groups, to careers in science and engineering. This research will also be incorporated into hands-on modules for high school teachers to disseminate knowledge to high school students in the Houston area, demonstrate impacts of nanotechnology on society, and recruit teachers to conduct research in the field of nanotechnology. Finally, the results will be incorporated into undergraduate and graduate environmental engineering courses on water quality and environmental modeling at the University of Houston. The overarching goal of this research is to develop a model that is capable of predicting the effects of surface coatings on photoreactivity across a variety of photocatalytic, metal oxide nanomaterials, including titanium dioxide and molybdenum oxide. The effect of the coating is hypothesized to be predictable from the composition of the surface coating, which will dictate the type and extent of coating interactions with the photoreactive nanomaterials. Novel approaches and analytical tools will be incorporated in this research to enable a mechanistic understanding of the coating effects, including (1) direct characterization and control of surface coating formation onto photocatalytic nanomaterials from heterogeneous mixtures of biomolecules and natural organic matter, (2) validation and refinement of complementary biological and chemical assays to quantify photoreactivity, and (3) application of in situ spectroscopic methods to identify and monitor the reactions of specific coating components on the nanomaterial surface. The detailed surface chemistry and reactivity data obtained in this research will ultimately be used to develop quantitative models expressing the fundamental mechanisms by which organic surface coatings modify the effective photoreactivity of nanomaterials.

近年来，在阳光照射下（光反应或光催化）降解有机污染物的新型纳米材料已经被发现和开发。这种独特的光反应性使其在各种水处理技术中的应用具有吸引力。另一方面，这种特性也可能与纳米材料在自然环境中的毒理学危害有关。预测纳米材料在水环境中的光反应性是具有挑战性的，因为纳米材料的表面可能被生物分子和天然有机物的复杂混合物所覆盖。这些复杂的表面涂层与辐照纳米材料的相互作用以及由此产生的对纳米材料的有效光反应性的影响尚不清楚。进一步的挑战是将涂层效应推广到目前正在研究的各种光催化纳米材料上。光催化纳米材料的例子包括二氧化钛，它可以被紫外线激活，以及新的可见光活性纳米材料，如氧化钼，可以在水处理应用中显示出更高的可行性。本研究将探讨复杂表面涂层的形成机制及其对各种金属氧化物纳米材料光反应性的影响。在本研究中建立的基础知识和模型将促进有效和安全的环境应用光催化纳米材料的开发，减轻工业和监管机构对纳米材料大规模测试的负担。这项研究的结果将通过休斯顿大学和当地博物馆之间的一个名为“揭开纳米材料世界”的联合项目向公众传播。该项目旨在让K-12学生，特别是来自代表性不足的群体的学生，接触和招募科学和工程领域的职业。这项研究还将被纳入高中教师的实践模块，向休斯顿地区的高中生传播知识，展示纳米技术对社会的影响，并招募教师进行纳米技术领域的研究。最后，研究结果将被纳入休斯顿大学水质和环境建模的本科生和研究生环境工程课程。本研究的首要目标是开发一个模型，该模型能够预测表面涂层对各种光催化、金属氧化物纳米材料（包括二氧化钛和氧化钼）的光反应性的影响。假设涂层的效果可以从表面涂层的组成来预测，这将决定涂层与光反应性纳米材料相互作用的类型和程度。本研究将采用新的方法和分析工具，以实现对涂层效应的机制理解，包括(1)直接表征和控制由生物分子和天然有机物质的异质混合物在光催化纳米材料上形成的表面涂层，(2)验证和改进互补的生物和化学分析，以量化光反应性，(3)应用原位光谱方法识别和监测纳米材料表面特定涂层组分的反应。在这项研究中获得的详细的表面化学和反应性数据最终将用于建立定量模型，表达有机表面涂层改变纳米材料有效光反应性的基本机制。

项目成果

Use of Polyaniline Coating on Magnetic MoO3 and its Effects on Material Stability and Visible-Light Photocatalysis of Tetracycline

• DOI: 10.1016/j.jece.2022.107635
• 发表时间: 2022-03
• 期刊: Journal of Environmental Chemical Engineering
• 影响因子: 7.7
• 作者: S. Fanourakis;Sharona Q. Barroga;R. Mathew;J. Peña-Bahamonde;Stacey M. Louie;Jem Valerie D. Perez

Graphene Oxide Nanocomposite Hydrogel Beads for Removal of Selenium in Contaminated Water

• DOI: 10.1021/acsapm.9b00612
• 发表时间: 2019-10-01
• 期刊: ACS APPLIED POLYMER MATERIALS
• 影响因子: 5
• 作者: Bandara, Pasan Chinthana;Perez, Jem Valerie D.;Rodrigues, Debora Frigi
• 通讯作者: Rodrigues, Debora Frigi

Oxidation state of Mo affects dissolution and visible-light photocatalytic activity of MoO3 nanostructures

• DOI: 10.1016/j.jcat.2019.11.035
• 发表时间: 2020
• 期刊: Journal of Catalysis
• 影响因子: 7.3
• 作者: J. Peña-Bahamonde;Chunzheng Wu;S. Fanourakis;Stacey M. Louie;J. Bao;D. Rodrigues

Redox mechanisms of conversion of Cr(VI) to Cr(III) by graphene oxide-polymer composite

• DOI: 10.1038/s41598-020-65534-8
• 发表时间: 2020-06-08
• 期刊: SCIENTIFIC REPORTS
• 影响因子: 4.6
• 作者: Bandara, P. C.;Pena-Bahamonde, J.;Rodrigues, D. F.
• 通讯作者: Rodrigues, D. F.

Natural Organic Matter (NOM) Imparts Molecular-Weight-Dependent Steric Stabilization or Electrostatic Destabilization to Ferrihydrite Nanoparticles

天然有机物 (NOM) 赋予水铁矿纳米颗粒分子量依赖性的空间稳定性或静电去稳定性

• DOI: 10.1021/acs.est.0c01189
• 发表时间: 2020-06-02
• 期刊: ENVIRONMENTAL SCIENCE & TECHNOLOGY
• 影响因子: 11.4
• 作者: Li, Zhixiong;Shakiba, Sheyda;Hu, Yandi
• 通讯作者: Hu, Yandi