CCEA 2019
Keynote Speakers

 

Keynote Speaker I


Prof. Yuegang Zuo

 

Department of Chemistry and Biochemistry, University of Massachusetts Dartmouth, USA

 

Yuegang Zuo is currently a Full Professor in analytical and environmental chemistry and Director of Graduate Programs at Department of Chemistry and Biochemistry, University of Massachusetts Dartmouth. He is also a Full Professor in marine chemistry at the School of Marine Science and Technology, University of Massachusetts. He received his B.S. degree in chemistry from Wuhan University in 1982, his M.S. degree in environmental chemistry from the Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, in 1984, and his Ph.D. in environmental science from Swiss Federal Institute of Technology Zurich in 1992. Most of his recent research has focused on separation, identification and quantification of endocrine disrupting pollutants and phenolic antioxidants in plants and seafood as well as in the related environments and examine their occurrence, sources, distribution, transportation and fate in the biochemsphere.  He has published over 70 scientific papers in prestige journals such as Science, and Environmental Science and Technology.

Speech Title: Absorption of Estrogenic Pollutants onto Microfiltration Membranes

Abstract: Estrogenic pollutants, like 17α-Ethinylestradiol (EE2), a compound with high endocrine-disrupting potency and high resistance to biodegradation in the aqueous environment, attracts increasing concern in the past decade. As a consequence, the elimination of EE2 is becoming a hot topic in recent researches (Zuo, Zhang & Deng, Chemosphere, 2006, 63, 1583-1590; Yong et al., Sci. Total Environ. 2013, 463-464, 802-809; Zuo, Zhang & Zhou, Environ. Sci.: Processes & Impacts 2013, 15, 1529-1535; Albalawi & Zuo, International J. Chem. Engineering & Applications, 2018, 9, 71-75). In this work, adsorption of EE2 was comparatively assessed on four types of microfiltration membranes at different pH, salinity, methanol content and concentrations of EE2 in feed solutions. Adsorption experiments performed in aqueous solution at different pH values showed that adsorption of EE2 by nylon membrane drops drastically along with the dissociation of EE2 with pH increasing from 9 to 11. Series of experiments on salinity (1.75-35g/L NaCl) effect were also performed at constant pH value, and the results indicated that adsorption of EE2 on nylon membrane increased with increasing salinity. Then, simulated brackish water prepared from a sequence of diluted seawater was employed to study the adsorption of EE2 in brackish water. The consequence matched with that of previous salinity effect study. Presence of methanol in feed solution significantly reduced nylon membrane adsorption of EE2.

 

Keynote Speaker II

      Prof. Yu “Frank” Yang

 

East Carolina University, USA

 

Dr. Yu “Frank” Yang is a Professor of Chemistry at East Carolina University located in the USA. Dr. Yang received his Ph.D. from University of Mainz, Germany in 1993. He joined the Department of Chemistry at East Carolina University as an assistant professor in 1997, tenured in 2003, and promoted to full professor in 2007.
Dr. Yang's group is an international leader in the field of comprehensive subcritical water research. His principal areas of interest and expertise include pharmaceutical analysis, green chemical processes, environmental chemistry, subcritical water chromatography and extraction, solubility and stability of organics in subcritical water. The main goal of Dr. Yang’s research programs is to eliminate or minimize the use of toxic organic solvents in extraction, chromatography, environmental remediation, and other chemical processes. Honors include the University Five-Year Achievement for Excellence in Research Award, the Sigma Xi Helms Research Award, the University of North Carolina Board of Governors Distinguished Professor for Teaching Award, the Scholar-Teacher Award, Cottrell College Science Awards from Research Corporation, and the Starter Grant Award from the Society for Analytical Chemists of Pittsburgh. Dr. Yang serves as the Editor-in-Chief for one journal and on the editorial board for four other peer reviewed journals.

Speech Title: A Potential New Process of Making Efficacious Herbal Medicine - Subcritical Water Extraction of Medicinal Herbs

Abstract: Due to its green nature and low side effects, herbal medicine has gained much greater attention in the western world. Both raw and pre-prepared herbal medicines and dietary supplements are sold in many developed countries, especially in the United States. The traditional way for patients to take the herbal medicine prescribed by doctors has been to cook the herbs in boiling water for 60 to 90 min and then drink the “medicinal soup.” This herbal medicine preparation method is called traditional herbal decoction (THD). Although this herbal decoction method has been used since ancient times, there are several major problems associated with the THD method. Therefore, a scientifically rigorous path for modernization of herbal preparation techniques is of great interest.
Subcritical water refers to high-temperature and high-pressure water under conditions lower than water’s critical point, 374 °C and 218 atm. Water at elevated temperatures acts like an organic solvent due to its weakened hydrogen bonds and decreased polarity. The solubility of organic compounds such as active pharmaceutical ingredients in medicinal herbs is dramatically enhanced by simply increasing the water temperature. This unique characteristic of water makes high-temperature water an excellent extraction fluid for efficient removal of organics from various sample matrices, including medicinal herbs. Because different temperatures can be employed to carry out subcritical water extractions, there will be an optimized temperature that yields the highest concentration of active pharmaceutical gradients and in turn produces the most potent herbal medicine.
In this work, an important Chinese medicinal herb, Dan Shen, was extracted using subcritical water. The extractions were carried out at 75, 100, 125, and 150 °C. The temperature and kinetic effects on the extraction efficiency of active pharmaceutical gradients from Dan Shen will be presented and discussed. The toxicity of the herbal extracts at different temperatures will also be evaluated and presented.

 

 

Keynote Speaker III


Assoc. Prof. Chi-wai KAN

 

Institute of Textiles and Clothing, The Hong Kong Polytechnic University, 
Hung Hom, Kowloon, Hong Kong

 

Dr. Kan graduated from Hong Kong Polytechnic with a BSc in Textile Chemistry. He gained his PhD degree from the Hong Kong Polytechnic University. He had worked in private and public sectors in the area of textile evaluation and safety and health management for more than five years before joining the Institute. His main duties in the Institute are in the area of teaching colouration and finishing. Dr. Kan's research interests are also in the area of colouration and finishing.
Dr. Kan holds the professional qualification of Chartered Colourist, Chartered Textile Technologist and Chartered Safety and Health Practitioner; also Fellowship of the Society of Dyers and Colourists and Textile Institute, U.K. In addition, Dr. Kan is a member of Royal Society of Chemistry, Institution of Occupational Safety and Health and Hong Kong Institution of Textile and Apparel.
BSc (Hons) in Textile Chemistry, The Hong Kong Polytechnic University, 1994
PhD in Textile Chemistry, The Hong Kong Polytechnic University, 1998
MSc in Total Quality Management and Business Excellence, Sheffield Hallam University, 2002

Speech Title: Non-aqueous Dyeing of Cotton with Reactive Dyes

Abstract: Dyeing with reactive dyes is generally performed in water-based dye bath. Waste aqueous effluent containing dye residues and concentrated electrolytes causes serious environmental problems. Sustainable water-free process for cotton dyeing using anionic surfactant as building as dye carrier. In recent years, new concepts in the dyeing technology that avoid using water and salt-free process, namely non-aqueous dyeing technology, are being investigated and evaluated.
The dyeability of cotton fabrics with reactive dye, in less water and salt free condition was investigated using reverse-micellar approach comprising of nonionic surfactant. The reactive dye was satisfactorily encapsulated in the reverse micelle under the optimised process parameters as measured by the colour yield. Dyeability of cotton fibre with reactive dye from the reverse micellar solution was improved even in a salt free condition. Experimental results revealed that dyeability in the proposed less water and salt free dyeing process is better than that in conventional water-based dyeing process.

 

Plenary Speaker I

Assoc. Prof. Yiwei Deng

 

Department of Natural Sciences, University of Michigan – Dearborn, USA

 

Dr. Yiwei Deng is an associate professor in the Department of Natural Sciences at the University of Michigan-Dearborn. She received her B.S. degree in chemistry from Wuhan University in 1982, her M.S. degree in environmental chemistry from the Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, in 1985, and her Ph.D. in environmental science from Swiss Federal Institute of Technology Zurich in 1992. Her research interests are in the areas of analytical chemistry and environmental chemistry. Her research work focus on development of analytical methods for environmental applications, and study sources, transformation and fate of pollutants (i.e., heavy metals, parabens, polycyclic aromatic hydrocarbons, petroleum hydrocarbons, etc.) in aquatic and atmospheric environments.

Speech Title: Aquatic Chemistry in the Atmosphere -- Case Studies

Abstract: The atmosphere is a complex reaction medium consisting of gas, aerosol particles, condensed water phases: rain droplets, snow and ice particles. Traditionally, atmospheric chemistry has dealt with reactions in the gaseous phase. Quantitative data on aqueous phase chemistry in the atmosphere are sparse compared to those from comparable gas-phase processes, even though studies have showed that atmospheric aqueous phases play an important role in the distribution, transport, transformation and fate of chemical species emitted to the atmosphere from natural sources and anthropogenic activities. In this seminar, two case studies on quantitative aquatic chemistry in the atmosphere will be presented. The first case study focuses on occurrence, concentration levels and possible sources of chemical elements (e.g., Pb, Cd, As and Fe) in wet precipitation (e.g., rain and snow) collected in the Metropolitan Detroit area. The concentrations of the elements were determined by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Enrichment factors of the elements were estimated and used to track the possible sources of the elements. The values of enrichment factors reported in this study provide useful indications of potential sources of the elements and reflect the air quality in this highly industrialized region. This study has also shown the occurrence of significant amounts of transition metals, such as Fe, that could serve as an effective chemical and photochemical catalyst for the transformation of other organic and inorganic compounds in the atmospheric liquids. The second case study deals with the photochemical reactions of aromatic acids. Aromatic acids are one group of the primary products generated from photodegradation of petroleum hydrocarbons. They have been detected in the atmospheric wet precipitation. It has been shown that the interaction between aromatic acids and sulfuric acid promotes formation of organic and sulfate aerosols which are largely associated with acid rain and photochemical smog. Thus, it is important to study the transformation of aromatic acids and understand their fate in the atmosphere. In the second case study, the photochemical reactions of aromatic acids in the absence and presence of iron species as a catalyst were investigated. The effect of irradiation wavelengths on the photochemical reactions was studied. The reaction products were identified. The possible reaction mechanisms involved will be discussed at the presentation.

 

Plenary Speaker II

Associate Prof. Takaaki Wajima

 

Chiba University, Japan

 

Assoc. Prof. Wajima was born in February 1976 in Saga Prefecture, Japan. He has been an Associate Professor in the Department of Urban Environment Systems, Graduate School of Engineering, Chiba University, Japan, since 2013. He received his bachelor’s degree and master’s degree in resource engineering from Kyoto University, Japan, in 1998 and 2000, respectively, and his PhD in environmental mineralogy and technology from Kyoto University, Japan, in 2004. His main PhD research theme was “microporous materials synthesized from paper sludge ash at low temperature, and their chemical mineralogy.” In 2004, he moved to the Institute of Ocean Energy at Saga University to work as a postdoctoral researcher, and from 2007 to 2013 he was an Assistant Professor at Akita University, Japan. His main research interests are waste recycling, resource recovery, and environmental purification.

Speech Title: Alkali Fusion of Waste Perlite Dust to Synthesize Faujasite Zeolite using a Rotary Kiln

Abstract: In this study, we attempted to continuously treat waste perlite dust by alkali fusion using a rotary kiln, to synthesize faujasite zeolite. A mixture of perlite dust and sodium hydroxide (NaOH) powder with three different mixture ratios (by weight) of 1:0.5, 1:0.8, and 1:1 was charged into a rotary kiln, and heated at 380 °C or 450 °C for 30 min. The resultant fused material was then converted into faujasite, a zeolite product, by heating it at 80 °C for 12 h followed by shaking for 24 h in distilled water at room temperature. It was confirmed that sodium silicate was formed using the rotary kiln, and the dissolution of Si and Al in the fused dust increased with increasing NaOH addition near the exit of the kiln. Faujasite could be synthesized for all fused conditions, and the cation exchange capacity (CEC) of the product increased with increasing NaOH addition, especially at close to the exit of the kiln. Varying amounts of the dust ranging from 0.1 to 1 g fused with NaOH (1:1) at 380 °C for 30 min using the rotary kiln were added to 2 mL of distilled water, shaken for 12 h at room temperature, and subsequently heated at 80 °C for 6 h to examine the effect of the solid/liquid ratio on the synthesis of zeolites from the fused dust. Regardless of the solid/liquid ratio, the amorphous material was formed after shaking at room temperature. Faujasite could be synthesized from the solution above a solid/liquid ratio of 0.25 g/mL, and the peaks of faujasite from the solution at 0.25 g/mL were higher than those at 0.5 g/mL.

 

 

 

 
 
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