Research & Development World

  • Home Page
  • Topics
    • Aerospace
    • Archeology
    • Automotive
    • Biotech
    • Chemistry
    • COVID-19
    • Environment
    • Energy
    • Life Science
    • Material Science
    • R&D Market Pulse
    • R&D Management
    • Physics
  • Technology
    • 3D Printing
    • A.I./Robotics
    • Battery Technology
    • Controlled Environments
      • Cleanrooms
      • Graphene
      • Lasers
      • Regulations/Standards
      • Sensors
    • Imaging
    • Nanotechnology
    • Scientific Computing
      • Big Data
      • HPC/Supercomputing
      • Informatics
      • Security
      • Software
    • Semiconductors
  • 2021 R&D 100 Award Winners
    • R&D 100 Awards
    • 2020 Winners
    • Winner Archive
  • Resources
    • Digital Issues
    • Podcasts
    • Subscribe
  • Global Funding Forecast
  • Webinars

Rice engineers find a way to turn water pollution into valuable chemicals

By Heather Hall | January 15, 2020

Mike Wong and Chelsea Clark. Photo by Jeff Fitlow

“Agricultural fertilizer runoff is contaminating ground and surface water, which causes ecological effects such as algae blooms as well as significant adverse effects for humans, including cancer, hypertension, and developmental issues in babies,” said Wong, professor and chair of the Department of Chemical and Biomolecular Engineering in Rice’s Brown School of Engineering. “I’ve been very curious about nitrogen chemistry, especially if I can design materials that clean water of nitrogen compounds like nitrites and nitrates.”

The study, published in the journal ACS Catalysis, challenges the idea that only palladium-based catalysts are effective for nitrite reduction and expands the frontiers of the reduction process.

The creation of ammonia from nitrite waste is especially exciting to Wong’s team. Ammonia-based fertilizers are critical for global food supplies, and ammonia has also been discussed as a carbon-free liquid fuel that could address climate change. But ammonia producers still rely heavily on the energy-intensive Haber-Bosch process, and making ammonia from nitrite waste could provide a green alternative, Wong said.

Over the past two decades, removing water contaminants through catalysis has garnered attention as a promising technology. Because palladium is regarded as the most effective metal for nitrate and nitrite elimination, few studies have thoroughly explored the performance of other metal catalysts.

Wong’s team of students and collaborators tested how well a rhodium catalyst could remove nitrite compared to a well-known palladium material. The team concluded that at higher pH values, palladium created mostly dinitrogen while rhodium created significant quantities of ammonium and smaller amounts of hydrazine.

At higher pH values, rhodium created significant quantities of ammonium and smaller amounts of hydrazine.

“What initially launched this project was the desire to find a cheaper metal than the commonly used palladium,” said Wong, who’s also a professor of chemistry and director of Rice’s Catalysis and Nanomaterials Laboratory. “While rhodium isn’t cheaper, we discovered that it can do something that palladium cannot — conduct the chemistry at a higher pH level and create much more ammonia. This was new chemistry, which sparked subsequent questions, and we just continued to follow the breadcrumbs.”

“The study explains why this material becomes more effective under conditions that would cause conventional catalysts to deactivate,” said Senftle, assistant professor of chemical and biomolecular engineering. “That opens new avenues for designing robust nitrite reduction catalysts.”

The paper builds on nitrogen chemistry research that’s increasingly become a focus for Wong and his team. In 2017, they published research on a material that could quickly and cheaply turn nitrate into dinitrogen gas.

Wong thinks catalytic converter technology based on the new rhodium catalyst could be most useful as a filter installed at sites prone to runoff, such as farms.

“The fact that we can start thinking about where to implement this is because we can now access the chemistry,” he said.

Wong and his team were most surprised by the rhodium catalyst’s creation of hydrazine.

“The thing that excites me most about this research is the observation of hydrazine,” said Chelsea Clark, a graduate student in Wong’s lab. “This gives us new ideas on how to make other useful chemicals from nitrite waste waters.”

While Wong and his team don’t yet know how this chemistry can best be implemented, they are eager to explore the opportunities it presents.

“I’m excited about removing nitrite, forming ammonia and hydrazine, as well as the chemistry that we figured out about how all this happens,” Wong said. “The most important takeaway is that we learned how to clean water in a simpler way and created chemicals that are more valuable than the waste stream.”

Additional co-authors include C. Prakash Reddy, Hao Xu, Kimberly Heck and Guohua Luo, all of Rice. The research was partially supported by the National Science Foundation’s Nanosystems Engineering Research Center for Nanotechnology Enabled Water Treatment (NEWT).

Written by Kendall Schoemann

Tell Us What You Think! Cancel reply

Related Articles Read More >

R&D 100 winner of the day: Guardiant
R&D 100 winner of the day: PPG HI-TEMP 1027 HD
R&D 100 of the day: Autonomous Self-Healing Sealant
Why there’s a neon shortage — and why it matters
2021 R&D Global Funding Forecast

Need R&D World news in a minute?

We Deliver!
R&D World Enewsletters get you caught up on all the mission critical news you need in research and development. Sign up today.
Enews Signup

R&D World Digital Issues

February 2020 issue

Browse the most current issue of R&D World and back issues in an easy to use high quality format. Clip, share and download with the leading R& magazine today.

Research & Development World
  • Subscribe to R&D World Magazine
  • Enews Sign Up
  • Contact Us
  • About Us
  • Drug Discovery & Development
  • Pharmaceutical Processing
  • 2022 Global Funding Forecast

Copyright © 2022 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising | About Us

Search R&D World

  • Home Page
  • Topics
    • Aerospace
    • Archeology
    • Automotive
    • Biotech
    • Chemistry
    • COVID-19
    • Environment
    • Energy
    • Life Science
    • Material Science
    • R&D Market Pulse
    • R&D Management
    • Physics
  • Technology
    • 3D Printing
    • A.I./Robotics
    • Battery Technology
    • Controlled Environments
      • Cleanrooms
      • Graphene
      • Lasers
      • Regulations/Standards
      • Sensors
    • Imaging
    • Nanotechnology
    • Scientific Computing
      • Big Data
      • HPC/Supercomputing
      • Informatics
      • Security
      • Software
    • Semiconductors
  • 2021 R&D 100 Award Winners
    • R&D 100 Awards
    • 2020 Winners
    • Winner Archive
  • Resources
    • Digital Issues
    • Podcasts
    • Subscribe
  • Global Funding Forecast
  • Webinars