| المؤلفون: |
Li Q; Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China., Cai X; Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China., Chen LH; Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China., Guan BB; Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China., Fan ZL; Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China., Zhu W; Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, P. R. China., Xue DX; Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry & Chemical Engineering, Shanxi Normal University, Xi'an, Shaanxi 710062, P. R. China. |
| مستخلص: |
Chromium Cr(VI) is frequently used in many fields and has been intensively researched for detection and/or removal from contaminated water. However, the existing approaches are still of low efficiency, high cost, and cumbersome in operation. It is thus highly imperative to hunt for alternative avenues to get out of the predicament. In this work, two bcu topological and highly stable zirconium-metal-organic frameworks (Zr-MOFs) of 1 and 2 have been deliberately prepared, displaying channel-type interior spaces replete with free bipyridine/biquinoline matrices and Zr-O defect sites. Because of their unique intrinsic features of high porosity and photosensitivity, 1 and 2 were deployed as versatile platforms to sense, adsorb, and catalytically reduce Cr(VI) ions. Indeed, the Zr-MOF of 1 performs excellently in fluorescence sensing and adsorption trapping of Cr(VI), with an ultralow detection limit of 0.0176 ppm and a fairly high saturated adsorption capacity of 145.77 mg/g, while 2 is more powerful than 1 in photochemical removal of Cr(VI), exhibiting a remarkable reduction efficiency of 98.05% just within 70 min and still up to 92.21% even after five consecutive photocatalytic cycles. Furthermore, possible photoluminescence, quenching, and reduction mechanisms were also tentatively proposed. This study may open up a new avenue for addressing some unresolved environmental issues, that is, the decontamination of highly toxic Cr(VI) from water. |
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