April 24, 2020:

Tyler Vogel receives an honorable mention in the Spring 2020 Independent Research in Chemistry Video Competition for undergraduate students. Great job Tyler!

April 22, 2020:

Marcelo is honored to receive the Outstanding Graduate Student Mentoring Award from the College of Arts & Sciences.

April 22, 2020:

Congratulations to Dr. Schuyler for presenting his exit seminar!

April 1, 2020:

Ariful Hoque is awarded a Research Challenge Trust Fund (RCTF) Fellowship for 2020-2021!

October 16, 2019:

September 24, 2019:

The excellent paper from Alexis titled "Production of Singlet Oxygen (1O2) during the Photochemistry of Aqueous Pyruvic Acid: The Effects of pH and Photon Flux under Steady-State O2(aq) Concentration" is published in Environmental Science and Technology, DOI: 10.1021/acs.est.9b03742. Read the press coverage at Phys.Org

July 27, 2019:

May 24, 2019:

The "crystal structure of zymonic acid and a redetermination of its precursor, pyruvic acid" is published in Acta Crystallographica Section E: Crystallographic Communications, DOI: 10.1107/S205698901900707.

May 10, 2019:

April 23, 2019:

Congrats T.J. for the publication of the paper "Using a Balloon-Launched Unmanned Glider to Validate Real-Time WRF Modeling" in Sensors, DOI: 10.3390/sensors19081914. Read and watch the press coverage from UKNOW, A&S, WKYT, Spectrumnews, WYMT, and FOX56.

March 21, 2019:

January 2, 2019:

A new NASA KY Space Grant is awarded to the lab.

November 28, 2018:

Alexis presented her exit seminar and defended her PhD thesis. Congrats Dr. Eugene!

November 26, 2018:

Congrats to T.J. for passing his oral qualifying exam.

November 15, 2018:

The lab is awarded a new NASA Rapid Response Grant!

October 29-30, 2018:

Marcelo participates in the meeting "Major Transitions in Life: Origins to Translation" at the Santa Fe Institute under the sponsorship of the NSF RCN For Exploring Life's Origins (2017-2022).

October 15, 2018:

Congrats to Arif for the publication of the article "Photocatalytic Activity: Experimental Features to Report in Heterogeneous Photocatalysis" in Materials.

October 10, 2018:

We welcome Anna as an undergraduate contributing to the atmospheric chemistry research of the lab.

September 7, 2018:

A new open access paper by first author Liz Pillar-Little is published in Environments: "An Overview of Dynamic Heterogeneous Oxidations in the Troposphere".

July 12, 2018:

Congrats to Sha-Sha and Alexis for the publication of the article "Cross Photoreaction of Glyoxylic and Pyruvic Acids in Model Aqueous Aerosol" in the Journal of Physical Chemistry A.

July 5, 2018:

An excellent paper by Alexis and Liz published in Langmuir is available for free to the public: "Enhanced Acidity of Acetic and Pyruvic Acids on the Surface of Water". Read the press coverage from or A&S.

June 11, 2018:

Marcelo and TJ present the work "Quantification of Trace Tropospheric Gases with Small Unmanned Aerial Systems (sUAS) during the 2017 CLOUDMAP Campaigns" in Boulder, CO. In addition, TJ wins a grant to participate in the 2018 ISARRA Flight Week (LAPSE-RATE) in the high altitude San Luis Valley. Read more from UKNow and A&S.

May 15, 2018:

We welcome back Jimmy Kaindu from Virginia Tech as a summer undergraduate researcher.

April 23, 2018:

Congratulations to T.J. for receiving the 2018 Fast Start Award from the Department of Chemistry!

March 23, 2018:

Alexis and T.J. each present
the research "Photochemistry of α-keto acids in model atmospheric waters" and "Using Unmanned Aerial Systems for the Detection of Trace Gases in the Atmosphere", respectively, at the 44th Naff Symposium.

February 19, 2018:

The paper from the Guzman Lab "
"Reactivity of Ketyl and Acetyl Radicals from Direct Solar Actinic Photolysis of Aqueous Pyruvic Acid" published by The Journal of Physical Chemistry A, 2017, 121 (15), pp 2924–2935, DOI: 10.1021/acs.jpca.6b11916" is among the most read American Chemical Society articles of 2017 in Physical Chemistry.

December 14, 2017

T.J. presents the talk "
Trace Gas Quantification with Small Unmanned Aerial Systems" and Alexis presents the poster "Photochemistry of α-keto acids in model atmospheric waters" at the AGU Fall Meeting in New Orleans, LA.

December 11, 2017:

Congratulations to Ariful Hoque for receiving the Outstanding Performance Award on the Oral Qualifying Exam!

November 20, 2017:

Congratulations to Arif and Sohel for passing the oral exam and becoming Ph.D. Candidates and to T.J. for completing the written portion of the cumulative exams.

September 8-19, 2017:

Alexis participates in the Third NAAMES Campaign in Canada with the team from NASA Langley

October 30, 2017:

Alexis' newest work using 2D NMR with gCOSY 13C-13C  correlation
published in the Journal of Physical Chemistry A advances the understanding of the aqueous photochemistry of pyruvic acid

October 23, 2017:

Congratulations to T.J. Schuyler for his paper "
Unmanned Aerial Systems for Monitoring Trace Tropospheric Gases" published in Atmosphere.

August 23, 2017:

Evie's graduation celebration and farewell party took place today. We wish Evie success in her new job as a Senior Scientist at PPD.

August 18, 2017:

The group celebrated Liz's graduation and her great Postdoctoral Fellowship starting in September at the University of Oklahoma.

August 2, 2017:

Our work "Using Unmanned Aerial Systems for the Detection of Trace Gases in the Atmosphere" is presented by T.J. and attracts a lot of attention at the Gordon Research Conference in Atmospheric Chemistry held in Newry, ME.

July 31, 2017:

Alexis presents our work "Photochemistry of α-keto acids in model atmospheric waters" at the Gordon Research Conference in Atmospheric Chemistry in Newry, ME.

July 26, 2017:

Congratulations to Dr. Ruixin (Evie) Zhou for successfully defending her PhD thesis

June 25-30, 2017:

Marcelo and T.J. participate in the second CLOUDMAP campaign in
Stillwater, OK, contributing measurements of the concentration of trace gases using small unmanned aerial systems.

May 22, 2017:

The productive work from Matias and Evie about the photocatalytic reduction of CO2 with H2O as a hole scavenger on irradiated Cu2O/TiO2 nanocomposites is published in Applied Catalysis B: Environmental. Read more from UKNOW, A&S,, Science Magazine,,,,,, or R&D.

May 18-20, 2017:

Evie and Alexis present our work "Protecting Cu2O from Photocorrosion during CO2 Reduction through a Direct Z-scheme in Cu2O/TiO2 Heterostructures" and "Photochemistry of α-keto acids in model atmospheric waters" at the Ohio Photochemical Society (OoPS) Meeting in Oregon, OH.

May 10, 2017:

In recognition of his contributions in research and scholarship, Kayvon Ghayoumi is honored with the Division of Environmental Chemistry 2017 Undergraduate award from the American Chemical Society. Read more from A&S.

May 9, 2017:

Congratulations to Dr. Pillar-Little for defending her PhD after her exit seminar!

May 4, 2017:

Evie Zhou presented an excellent exit seminar to the Department of Chemistry.

April 28, 2017:

We are proud of Kayvon, who received
the second place in the Regional Undergraduate Chemistry Research Poster Competition.

April 25, 2017:

Marcelo presents the seminar "Probing Interfacial Chemistry: Heterogeneous Oxidations in the Environment" at John Hopkins University in Baltimore, MD.

April 19-20, 2017:

Marcelo is awarded a grant from SOLAS to participates in the first cryosphere and atmospheric chemistry (CATCH) Workshop held in France, which was organized by IGAC.

April 10, 2017:

Our unifying mechanism for the oxidation of phenols derived from benzene, toluene, anisole, biomass burning and combustion emissions is published in Environmental Science and Technology. A&S and

April 3, 2017:

Congratulation to Evie for the outstanding paper "
Catalyzed Synthesis of Zinc Clays by Prebiotic Central Metabolites" published in Scientific Reports
.

March 31. 2017:

The mechanistic paper "Reactivity of Ketyl and Acetyl Radicals from Direct Solar Actinic Photolysis of Aqueous Pyruvic Acid" by Alexis Eugene clearly explains the photochemistry of aqueous pyruvic acid. The open access paper is available at  J. Phys. Chem. A. On the news at
A&S and
February 13, 2017:

A new collaborative review paper about "
Nitrate radicals and biogenic volatile organic compounds: oxidation, mechanisms, and organic aerosol"  is published in Atmospheric Chemistry and Physics.

February 1, 2017:

Marcelo presents the invited seminar "
Probing Interfacial Chemistry: Heterogeneous Oxidations in the Environment" at the University of Alabama in Huntsville.

December 1, 2016:

Evie presents our work with photocatalytic Z-scheme systems at the 6th TFISE Annual Sustainability Forum.

September 16, 2016:

Marcelo presents the seminar "Probing Interfacial Chemistry: Heterogeneous Oxidations in the Environment" at Rice University.

August 24, 2016:

Marcelo presents the talk "Interfacial Oxidation of Catechol" at the Physical Chemistry of Atmospheric Processes Symposium during the 252nd ACS National Meeting in Philadelphia. 

August 23, 2016:

Marcelo presents the invited talk "Probing Interfacial Chemistry: Photocatalytic Reductions and Heterogenous Oxidations" at the Young Academic Investigator Symposium from the Division of Organic Chemistry at the 252nd ACS National Meeting in Philadelphia. 

August 2, 2016:

"Aqueous Photochemistry of Glyoxylic Acid" becomes the most read article of JPC A for the last month.

July 14, 2016:

Alexis is honored by receiving a NASA graduate fellowship! Read more in UKNOW.

July 12, 2016:

Congratulations to Liz on being awarded an IGAC Early Career Travel Grant to attend the 2016 IGAC Science Conference.

July 11, 2016:

Liz and Marcelo join the first CLOUD MAP campaign in Stillwater, OK. Check out UKNOW,, and suasnews.

July 7, 2016:

Our work "Heterogeneous Oxidation of Catechol" is selected for the special Atmospheric Physical Chemistry virtual issue of the Journal of Physical Chemistry A.

July 1, 2016:

Marcelo is selected to present at the 252th ACS National Meeting in Philadelphia as part of the 2016 Young Academic Investigator Symposium from the Division of Organic Chemistry.

May 18, 2016:

The article "Aqueous Photochemistry of Glyoxylic Acid" is accepted for publication in the Journal of Physical Chemistry A and quickly becomes a highly read paper.

May 18, 2016:

Liz, Alexis, and Evie present talks about their work at the 47 CERM of ACS in Cincinnati, OH.

May 6:

Liz received the Outstanding Graduate Student Research Award for the 2015-2016 Academic Year.
Liz's outstanding graduate student research award

May 6:

Evie received the Outstanding Teaching Assistant Award for the 2015-2016 Academic Year.
Evie's outstanding TA award

April 25, 2016:

Congrats to Alexis for her new GSAY fellowship!

April 20, 2016:

Congratulations to Evie for receiving a RCTF fellowship!

April 5, 2016:

The article "Heterogeneous Oxidation of Catechol" becomes the most read paper of the Journal of Physical Chemistry A during the last year!

March 17, 2016:

Congratulations to Evie for the paper "Photocatalytic Reduction of Fumarate to Succinate on ZnS Mineral Surfaces" published in the Journal of Physical Chemistry C. News coverage by Phys.Org.

January 15, 2016:

We welcome Dr. Matias Aguirre as a visiting scholar studying the photocatalytic reduction of CO2.

December 17 and 19, 2015:

Evie and Alexis both present talks at Pacifichem in Honolulu, Hawaii.

December 1, 2015:

We are proud of Alexis, who received an award to the best presentation at the Tracy Farmer Institute for Sustainability and the Environment (TFISE) Forum.

November 2, 2015:

Liz is the recipient of the 2015-2016 Women's Club Endowed Fellowship!

September 25, 2015:

Congratulations to Liz and Evie in the acceptance of the article "Heterogeneous Oxidation of Catechol" to the Journal of Physical Chemistry A. In the news:

September 10, 2015:

We welcome graduate student Sohel Rana to the group.

September 3, 2015:

Marcelo presents an invited talk at Auburn University.

August 18-20, 2015:

All members of the lab present talks at the 250th ACS National Meeting in Boston, MA.

August 6, 2015:

A new grant from NSF is awarded for the CLOUD-MAP Project to study Atmospheric Physics and Chemistry in collaboration with researchers at the University of Kentucky and three other universities. UKNOW, Business Lexington

August 2-7, 2015:

Marcelo presents current research at the Gordon Research Conference: Atmospheric Chemistry.

June 22-24, 2015:

Marcelo presents an invited talk at the "Workshop on Nitrate Radicals and Biogenic Volatile Organic Compounds: Oxidation, Mechanisms and Organic Aerosol".

May 13, 2015:

Alexis Eugene is awarded the Kentucky Opportunity Fellowship for 2015-2016. Congratulations!

May 11, 2015:

We welcome undergraduate student Michele Kuceki to our lab.

May 3, 2015:

Evie Zhou is honored with a RCTF Assistantship for 2015-2016.

March 9, 2015:

Marcelo presents an invited seminar at the University of Iowa.

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January 6, 2015:

Congratulations to Alexis, recipient of a 2015 ACS Environmental Chemistry Graduate Student Award!

December 23, 2014:

Alexis' mechanistic work is submitted for publication to Atmospheric Chemistry and Physics Discussions as a contribution to our collaboration with the Ng Group from Georgia Tech.

November 25, 2014:

Congratulations to Liz and Rob, coauthors of the article "Catechol Oxidation by Ozone and Hydroxyl Radicals at the Air-Water Interface", accepted for publication in Environmental Science & Technology.  In the news:, and UKnow.

November 6, 2014:

Marcelo presents an invited talk at Georgia Tech.

October 16 and 17, 2014:

The Guzman Lab presents four talks at the SERMACS meeting in Nashville in the Environmental Chemistry and Physical Chemistry sections.

August 10, 2014:

Marcelo presents an invited talk in the ACS Symposium "Environmental Interfaces in the Atmosphere: From Surface Chemistry to Air Quality, Climate and Health Effects." San Francisco, CA.

July 30, 2014:

Congratulations to Shasha for all the work accomplished and defending her M.S. thesis!

May 12, 2014:

Congratulations to Evie on the acceptance of her first manuscript in the Journal of Physical Chemistry C.

May 9, 2014: 

Rob receives the "Stephen Harris Cook Memorial Scholarship" of the Department of Chemistry. Congratulations!

May 6, 2014:

Congratulations to Alexis for being the recipient of the Graduate School Academic Year Fellowship.

March 25, 2014:

The lab is awarded a new NASA grant.

February 12, 2014:

January 22, 2014:

Samah Saad joins the group. She is a talented High School student in the Kentucky Young Researcher Program.

December 21, 2013:

Congratulations to Liz for being honored with "The Outstanding Student Paper Award (OSPA)" in the Atmospheric Sciences section of AGU 2013!

December 10, 2013:

Marcelo was the chair of the section Sources and Chemistry of Atmospheric Oxidants III at the AGU Fall Meeting in San Francisco.

December 9, 2013:

Liz and Marcelo present their work at the AGU Fall Meeting in San Francisco.

November 15, 2013:

Alexis, Liz, and Marcelo present their work at the SERMACS meeting in Atlanta.

November 14, 2013:

Evie presents her work at the SERMACS meeting in Atlanta.

September 27, 2013:

We are happy for the acceptance of Alexis's work in the Proceedings of the National Academy of Science.

September 1, 2013:

We welcome Robert Camm. Rob is a new undergraduate student in the lab.

August 29, 2013: 

Congratulations Liz for the acceptance of your manuscript in Environmental Science & Technology.

August 29, 2013:

Marcelo delivered an invited talk at the Goldschmidt Conference.

July 25, 2013:

Marcelo hosted a workshop for the summer science camp at UK.

April 15, 2013:

Evie received full funding support to present our work in Montreal!

April 12, 2013:

Liz wins the first prize for her research poster that recognizes outstanding achievements in chemistry.

April 12, 2013:

We were delighted to host the 39th Naff Symposium.

April 1, 2013:

We are proud of Alexis and Liz. They accepted the Kentucky Opportunity Fellowship and the Max Steckler Fellowship.

March 31, 2013:

Marcelo is awarded a NSF CAREER award starting on July 1, 2013.  

February 1, 2013:

The lab is awarded a NASA grant.

November 1, 2012:

Welcome Alexis. She joined the lab in October 2012.

October 17, 2013:

We are happy to announce that a new manuscript has been accepted for publication in Atmospheric Chemistry and Physics.

July 31, 2012:

July 26, 2012:

Marcelo hosted a workshop for the summer science camp at UK.

May 25, 2012:

Marcelo delivers an invited talk in Arlington. This was a great NSF sponsored symposium about Catalytic Mechanisms and the Emergence of Metabolic Networks.

May 16, 2012:

The article "Concentration Effects and Ion Properties Controlling the Fractionation of Halides during Aerosol Formation" was published in the Journal of Physical Chemistry A.

May 15, 2012:

We are proud of Elizabeth, who accepted the Arthur Holly Compton Fellowship in the Physical Sciences and Mathematics.

May 4, 2012:

Congratulations Liz! We are happy you won the 2012 Fast Start Award of the Department of Chemistry.

May 3, 2012:

April 11, 2012:

Richa defended her master thesis successfully today. Congratulations!

November 1, 2011:

Welcome to our new group members! Evie Zhou, Shasha Xia, and Liz Pillar joined the group in Fall 2011.