Heavy　metal　ions　in　water　are　harmful　to　human　body,　especially　Pb(II)　and　Hg(II)　ions,　therefore,　it　is　necessary　to　remove　Pb(II)　and　Hg(II)　ions.　By　adjusting　the　amount　of　concentrated　hydrochloric　acid　used　in　the　synthesis　process,　defective　mercapto-functionalized　zirconium-based　metal-organic　frameworks　(Zr-MOFs)　UiO-66-(SH)2　were　synthesized　and　used　for　the　removal　of　Pb(II)　and　Hg(II)　ions　from　their　aqueous　solutions.　Through　adsorption　experiments　of　the　heavy　metal　ions,　it　is　found　that　UiO-66-(SH)2　showed　more　defects　when　more　hydrochloric　acid　was　introduced　in　its　synthesis,　and　enhanced　adsorption　capacity　for　Pb　(II)　and　Hg　(II)　ions.　The　defective　UiO-66-　(SH)2　exhibited　maximum　adsorption　capacities　of　45.　11　and　258.　75　mg　/　g　for　low-concentration　Pb　(II)　and　Hg　(II)　ions　(50　-　70　mg　/　L)　with　high　adsorption　selectivity　over　many　other　ions,　respectively.　After　three　adsorption-desorption　cycles,　no　obvious　decrease　in　the　adsorption　capacity　of　the　defective　UiO-66-(SH)2　for　Pb(II)　and　Hg(II)　ions　was　observed,　indicating　a　high　potential　of　this　material　in　the　removal　of　heavy　metal　ions　from　water.　©　2024　Beijing　University　of　Technology.　All　rights　reserved.