Education & Certifications

  • M.S., Stanford University, Chemical Engineering (2024)
  • B.S., University of California, Berkeley, Chemical Engineering (2021)

Contact

  • Academic
    aringsby@stanford.edu
    University - Student Department: Chemical Engineering Position: Graduate

Additional Info

Links

All Publications

  • Do oversimplified durability metrics undervalue biochar carbon dioxide removal? ENVIRONMENTAL RESEARCH LETTERS Ringsby, A. J., Maher, K. 2025; 20 (3)

    View details for DOI 10.1088/1748-9326/adac7b

    View details for Web of Science ID 001418111200001

  • Sorption of Soil Carbon Dioxide by Biochar and Engineered Porous Carbons. Environmental science & technology Ringsby, A. J., Ross, C. M., Maher, K. 2024

    Abstract

    CO2 is 45 to 50 times more concentrated in soil than in air, resulting in global diffusive fluxes that outpace fossil fuel combustion by an order of magnitude. Despite the scale of soil CO2 emissions, soil-based climate change mitigation strategies are underdeveloped. Existing approaches, such as enhanced weathering and sustainable land management, show promise but continue to face deployment barriers. We introduce an alternative approach: the use of solid adsorbents to directly capture CO2 in soils. Biomass-derived adsorbents could exploit favorable soil CO2 adsorption thermodynamics while also sequestering solid carbon. Despite this potential, previous study of porous carbon CO2 adsorption is mostly limited to single-component measurements and conditions irrelevant to soil. Here, we probe sorption under simplified soil conditions (0.2 to 3% CO2 in balance air at ambient temperature and pressure) and provide physical and chemical characterization data to correlate material properties to sorption performance. We show that minimally engineered pyrogenic carbons exhibit CO2 sorption capacities comparable to or greater than those of advanced sorbent materials. Compared to textural features, sorbent carbon bond morphology substantially influences low-pressure CO2 adsorption. Our findings enhance understanding of gas adsorption on porous carbons and inform the development of effective soil-based climate change mitigation approaches.

    View details for DOI 10.1021/acs.est.4c02015

    View details for PubMedID 38689207

https://orcid.org/0000-0002-6317-1902