The　recovery　of　scattered　metal　ions　such　as　perrhenate　(Re(VII))　from　industrial　effluents　has　enormous　economic　benefits　and　promotes　resource　reuse.　Nanoscale-metal/biochar　hybrid　biosorbents　are　attractive　for　recovery　but　are　limited　by　their　insufficient　stability　and　low　selectivity　in　harsh　environments.　Herein,　a　superstable　biochar-based　biosorbent　composed　of　ZnO　nanoparticles　with　remarkable　superhydrophobic　features　is　fabricated,　and　its　adsorption/desorption　capabilities　toward　Re(VII)　in　strongly　acidic　aqueous　solutions　are　investigated.　The　ZnO　nanoparticle/biochar　hybrid　composite　(ZBC)　exhibits　strong　acid　resistance　and　high　chemical　stability,　which　are　attributable　to　strong　C-O-Zn　interactions　between　the　biochar　and　ZnO　nanoparticles.　Due　to　the　advantages　of　its　hydrolytic　stability,　superhydrophobicity,　and　abundance　of　Zn-O　sites,　the　ZBC　proves　suitable　for　the　effective　and　selective　separation　of　Re(VII)　from　single,　binary　and　multiple　ion　systems　(pH　=　1),　with　a　maximum　sorption　capacity　of　29.41　mg/g.　More　importantly,　this　material　also　shows　good　recyclability　and　reusability,　with　high　adsorption　efficiency　after　six　adsorption-desorption　cycles.　The　findings　in　this　work　demonstrate　that　a　metal/biochar　hybrid　composite　is　a　promising　sorbent　for　Re(VII)　separation.　[Figure　not　available:　see　fulltext.]　©　2021,　Higher　Education　Press.