An　ideal　solution　to　water　or　pollutant　contamination　and　energy　problem　is　to　advance　photocatalysts　that　are　highly　effective　for　both　reducing　contaminants　and　cleaning　water.　In　this　regard,　carbon　nitride　(CN)　has　strong　stability　with　prominent　band　structure　and　can　be　used　to　produce　hydrogen　through　water　splitting　due　to　an　easier　fabrication　process.　Uric　acid　(UA)　was　integrated　as　a　conjugated　monomer　in　the　urea　based　CN　system　using　the　molecular　doping　(copolymerization)　process.　The　photocatalysis　of　water　reduction　(HER)　by　using　a　new　growth　technique　of　minimally　priced　effective　monomer　UA　inside　CN,　which　also　optimized　the　photodegradation　of　Rhodamine　B　dye　(RhB)　under　light　illumination　(lambda　=　420　nm).　By　increasing　light　transmittance,　speeding　up　photogenerated　electrons　and　holes,　and　changing　the　physicochemical　properties　of　CN,　modified　samples　dramatically　improve　photocatalytic　efficiency.　The　ideal　samples　CNU-UA10.0　showed　a　substantial　increase　in　photocatalytic　activity,　with　an　HER　690.01　mu　mol/h　higher　than　CNU　(82.89　mu　mol/h),　based　on　the　implications　of　different　configurations　on　the　reaction　mechanism.　Moreover,　an　extraordinary　apparent　quantum　yield　(AQY)　of　about　57.43%　at　420　nm　has　been　observed　for　CNU-UA10.0.　Under　the　same　conditions　and　illuminations,　H2　performance　versus　RhB　dye　degradation　was　compared.　CNU-UA,　on　the　other　hand,　had　a　three-fold　higher　pseudo-order　kinetic　constant　for　photodegradation　of　RhB　than　CN.　The　results　demonstrate　a　major　step　toward　in　the　direction　of　custom-designed　photocatalysts　with　efficient　water　reduction　and　pollutants　degradation　capability　for　future　demand.