Forums | HES 健康与环境科学

15 November 2024, 4:58 PM

Speaker: Dr. Jing Zhang

报告人： 张静博士

Title: Biotic- and abiotic-mediated iron mineral transformation for controlling the stability of Mo

报告题目： 生物和非生物介导的铁矿物晶相转化及其控制Mo的稳定性

Date: 2024-11-18

Time: 13:30-14:30 

Room: ES354

Host: Dr. Zheng Chen

主持人：陈正

Tencent Meeting ID: 748-5683-7998

Abstract: 

Molybdenum (Mo) is an essential nutrient in biological systems, catalysing the global biogeochemical C, N, and S cycles and other important redox processes. However, at high concentrations, it can be toxic to microorganisms, animals and plants. Iron oxides are ubiquitous in nature and represent a potential control on Mo mobility through adsorption and phase transformation in the presence of Fe(II)/bacteria (Geobacter sulfurreducens). This talk will cover the ternary system of Mo(VI)-bacteria-iron oxyhydroxides, to understand the mechanisms of adsorption, redox, and mineral transformation among Mo(VI), Geobacter sulfurreducens, and iron oxyhydroxides, enabling predictions and controls of long-term Mo mobility and Fe mineral transformation under a variety of biogeochemical scenarios. This will help to develop guidelines for soil health and provide strategies for soil contamination treatment. 

摘要：

钼（Mo）是生物系统中不可或缺的营养物质，可催化全球生物地球化学中的碳、氮和硫循环以及其他重要的氧化还原过程。然而，高浓度的钼会对微生物、动物和植物产生毒性。铁氧化物在自然界中无处不在，在铁(II)/微生物（Geobacter sulfurreducens）存在的情况下，铁氧化物可以通过吸附和相变对钼的流动性进行控制。本讲座将介绍钼（VI）-微生物-铁氧化物的三元系统，以了解钼（VI）、硫还原地杆菌和铁氧化物之间的吸附、氧化还原和矿物转化机制，从而预测和控制各种生物地球化学情景下钼的长期流动性和铁氧化物的晶相转化。这将有助于制定土壤健康准则和提供土壤污染修复策略。

Biography：

Dr. Jing Zhang is an international research fellow at Peking University. She completed her PhD at The University of Manchester in Environmental Science (Geochemistry and Geomicrobiology). Her work focuses on the biotic and abiotic induced iron mineral transformation and its stability for controlling mobility of heavy metals and organic carbon under a variety biogeochemical scenarios. She is also interested in the toxicity and health of bacteria under a range of heavy metal concentrations. Her research at Manchester involved the molecular-scale interaction mechanisms between heavy metal contaminants (Mo & V) and iron oxide nanoparticles (hematite & (bio)magnetite), applying synchrotron-based techniques, to identify changes in oxidation states and bonding structure of contaminants on iron mineral surfaces. Her work has been published in high level journals including ES&T and JHM. She was awarded the American Chemical Society Early Career Award.

嘉宾介绍：

张静博士是北京大学国际博士后。她在曼彻斯特大学完成了环境科学（地球化学和地球微生物学）的博士学位。她的研究重点是生物和非生物诱导的铁矿物晶相转化及其在各种生物地球化学情景下控制重金属和有机碳迁移的稳定性。她还对各种重金属浓度对细菌的毒性和健康的影响感兴趣。她在曼彻斯特的研究涉及重金属污染物（钼和钒）与纳米铁氧化物颗粒（赤铁矿和（生物）磁铁矿）之间的分子尺度相互作用机制，应用同步辐射等先进技术，确定铁矿物表面污染物氧化态和键合结构的变化。她的研究成果发表在 ES&T 和 JHM 等高水平期刊上。她曾获得美国化学学会早期职业科学家奖。

Look forward to seeing you!

Liwen Wu