The　decaying　photocatalytic　rate　caused　by　carrier　recombination　is　a　thorny　problem　that　has　not　been　properly　solved.　Improvement　of　photocatalysis　can　be　achieved　through　structural　innovation,　diversification　of　catalytic　modes,　or　a　combination　of　both.　Herein,　effective　separation　of　photo-generated　carriers　in　Bi0·5Na0·5TiO3/ZnO　composites　was　achieved　by　heterojunction　construction　for　energy　band　regulation　and　synchronously　mechanical　energy　harvesting　from　piezoelectric　effect.　The　formation　of　heterojunctions　between　Bi0·5Na0·5TiO3　and　ZnO　was　confirmed　by　electron　microscopy　and　analysis　of　X-ray　photoelectron　spectroscopy　spectra.　The　degradation　performance　of　Rhodamine　B,　a　representative　industrial　dye　contaminant,　was　optimized　through　the　formation　of　Bi0·5Na0·5TiO3/ZnO　heterojunctions　and　ultrasonic　vibration　harvesting.　Their　band　structures　were　described　in　detail　and　electrochemical　tests　were　performed　to　substantiate　a　novel　Z-scheme　heterostructure　that　can　explain　the　carrier　separation　and　transfer　processes　in　catalysis.　The　piezoelectric　polarization　field　generated　by　the　piezoelectric　effect　of　both　Bi0·5Na0·5TiO3　and　ZnO　coordinates　perfectly　with　the　photocatalysis,　enabling　the　piezo-photocatalysis.　Our　research　opens　a　promising　avenue　in　alleviating　charge　carrier　complexation　through　heterojunction　construction　and　mechanical　strain　for　future　pollutants　degradation　via　catalysis.　©　2023　Elsevier　Ltd