ArticleScientific reports2025
Effect of ammonium hydroxide modification of ZIF-8 nanoparticles on hexavalent chromium removal from aqueous solution.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Owing to the extraordinary properties of zeolitic imidazolate framework (ZIF)-8, it finds myriad of applications ranging from sensing to wastewater treatment. Herein, ZIF-8 and ammonia solution treated ZIF-8 (ZIF-8/NH3) were synthesized, characterized, and then employed to remove hexavalent chromium Cr(VI) from aqueous solutions. ZIF-8 with crystalline and distinct structures was successfully formed, as evidenced by characterization methods like XRD, FTIR, BET, and FESEM. Response surface methodology-optimized batch adsorption experiments showed that the performance of adsorbents was strongly impacted by significant factors such as pH, adsorbent dose, and initial Cr(VI) concentration. Further, ZIF-8/NH3 showed a maximum adsorption capacity of 4.69 mg/g in comparison to ZIF-8 of 3.84 mg/g according to Langmuir isotherm analysis, with R2 values of 0.9300 for ZIF-8/NH3 and 0.9060 for ZIF-8. In addition, the kinetic analyses revealed pseudo-second-order behaviour for both adsorbents, indicating chemisorption as the predominant mechanism. In summary, it is concluded that after the ZIF-8 modification with NH3, a slight increase in improvement of adsorption capacity was observed.
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