A survey of photogeochemistry

  title={A survey of photogeochemistry},
  author={Timothy A. Doane},
  journal={Geochemical Transactions},
  • T. A. Doane
  • Published 10 February 2017
  • Chemistry
  • Geochemical Transactions
The participation of sunlight in the natural chemistry of the earth is presented as a unique field of study, from historical observations to prospects for future inquiry. A compilation of known reactions shows the extent of light-driven interactions between naturally occurring components of land, air, and water, and provides the backdrop for an outline of the mechanisms of these phenomena. Catalyzed reactions, uncatalyzed reactions, direct processes, and indirect processes all operate in… 

Exposure to Light Elicits a Spectrum of Chemical Changes in Soil

The significance of photochemically active solar radiation is well substantiated in Earth's air and water environments, but no broad connection has yet been ascertained between sunlight and the

Photoelectric conversion on Earth’s surface via widespread Fe- and Mn-mineral coatings

This work reveals the inherent “phototrophic-like” behavior of vast expanses of natural rock/soil surfaces from deserts, red soils, and karst environments, all of which can drive photon-to-electron conversions.

Analysis of Photocatalytic Nitrogen Fixation on Rutile TiO$_2$(110)

Photocatalytic nitrogen fixation provides a promising route to produce reactive nitrogen compounds at benign conditions. Titania has been reported as an active photocatalyst for reduction of

Nucleobases on the Primitive Earth: Their Sources and Stabilities

Nucleobases are nitrogen heterocycles that are key structural components of biological nucleic acids. Some theories for the origins of life suggest a role for environmentally supplied organic

Photochemical emission and fixation of NOX gases in soils.

Conduction Band of Hematite Can Mediate Cytochrome Reduction by Fe(II) Under Dark and Anoxic Conditions.

The results showed that the rates of c-Cyts reduction were greatly enhanced in presence of the semiconducting mineral hematite, and this mechanistic study on the conduction band mediating electron transfer could help interpreting the role of semiconductor minerals in microbial Fe(II) oxidation process under dark-anoxic conditions.



Emerging areas in atmospheric photochemistry.

A set of new and emerging ideas mainly dealing with long wavelength photochemistry both in the gas phase and on a wide range of environmental surfaces are highlighted, which have the potential to introduce new chemical pathways into tropospheric chemistry and may impact atmospheric radical formation.

Letter. A natural photoelectrochemical cell for water splitting: Implications for early Earth and Mars

Abstract The surface oxidation of pyrite can create a (hydr)oxide layer. This configuration constitutes a natural two-semiconductor (tandem) photoelectrochemical cell. Here, we show that an

Anoxic photochemical oxidation of siderite generates molecular hydrogen and iron oxides

It is proposed that the photochemistry of Earth-abundant minerals with wide band gaps would have potentially played a critical role in shaping the biogeochemical evolution of early Earth.

Indirect photochemistry in sunlit surface waters: photoinduced production of reactive transient species.

The main transients (˙OH, CO3(-˙) , (1)O2, and CDOM triplet states) are involved in the indirect phototransformation of a very wide range of persistent organic pollutants in surface waters.

An introduction to geocatalysis

Evidence for photochemical generation of superoxide ion in humic waters

On irradiation with visible or near UV light the coloured substances in natural humic waters can undergo several reactions. They may be bleached and partially degraded1–3, perhaps by a cyclic

Photoreduction of Nitrogen on TiO2 and TiO2-Containing Minerals

A report appearing in 1975 demonstrated that incompletely out-gassed, powdered titanium dioxide photo-reduces acetylene to ethylene and prompted attempts to achieve the photoreduction of molecular

From Light to Life

  • P. Falkowski
  • Chemistry
    Origins of Life and Evolution of Biospheres
  • 2015
The evolution of the structural motifs responsible for redox reactions (the biological “transistors”) across the tree of life, and the photogeochemical reactions on minerals that ultimately came to be the driving force for these biological reactions are examined.