Two-dimensional　(2D)　Bi2WO6,　Bi2MoO6,　and　Bi2WxMo1_xO6　(x　=　0.1,　0.3,　0.5,　0.7,　and　0.9)　solid　solution　photocatalysts　were　synthesized　using　the　hexadecyl　trimethyl　ammonium　bromide-assisted　hydrothermal　method.　All　of　the　samples　displayed　a　morphology　of　irregularly　rectangular　nanosheets　with　a　thickness　of　7.0-17.4　nm.　The　photocatalytic　performance　of　Bi2WxMo1_xO6　was　much　better　than　that　of　Bi2MoO6　or　Bi2WO6　for　the　selective　oxidation　of　toluene,　with　the　Bi2W0.3Mo0.7O6　solid　solution　showing　the　highest　benzaldehyde　formation　rate　(1663　mu　mol/(g　h)),　which　was　about　1.95　and　2.83　times　higher　than　those　obtained　over　Bi2MoO6　and　Bi2WO6,　respectively.　Furthermore,　91%　benzaldehyde　selectivity　and　excellent　stability　were　also　achieved　over　Bi2W0.3Mo0.7O6.　The　enhancement　in　photocatalytic　activity　of　Bi2W0.3Mo0.7O6　was　attributable　to　the　balance　of　fast　charge　kinetics　and　optimized　energy　band　structure.　The　results　of　the　reactive　species　trapping　and　active　radicals　detection　experiments　reveal　that　the　photogenerated　holes,　superoxide　species,　and　carbon-centered　radicals　might　play　the　important　roles　in　the　generation　of　benzaldehyde,　and　the　possible　photocatalytic　toluene　oxidation　mechanisms　over　Bi2W0.3Mo0.7O6　were　accordingly　proposed.