Provided herein are methane conversion devices comprising a filter means (e.g., one or more filters), a circulation means (e.g., one or more circulating pumps), a reaction means (e.g., one or more reactor assemblies), a control means (e.g., central process unit, thermo-controller, UV controller, and the like), an energy supply means (e.g., ultra-violet lamp, direct sunlight, heating assembly, and the like).