Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 59, Issue 18, Pages 8538-8550Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b06417
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- DST-SERB, India [ECR/2017/000670]
- IIT Mandi [IITM/SG/NRT-58]
- Ministry of Human Resource Development (MHRD), India
- Advanced Materials Research Centre (AMRC), IIT Mandi
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This report deals with the fabrication and utilization of a novel 2D zinc-based metal-organic framework (MOF) {[Zn(PA(2-))(4,4'-bpy)](H2O)}(n) (where PA = pamoic acid and 4,4'-bpy = 4,4'-bipyridine). The Zn-MOF has been synthesized via a solvothermal method and emanates green fluorescence. As Cr(VI) is a fatal and carcinogenic ion, it is extremely important to discern and remove it from nature. The bright green fluorescence of Zn-MOF can be quenched upon interaction with a Cr2O72- ion, which implies the MOF's applicability as a Cr(VI) detector through turn-off fluorescence signaling. On the contrary, among various strategies to remove Cr(VI), the photocatalytic reduction of Cr(VI) to Cr(III) is acknowledged as the most effective one. Delightfully, apart from being a Cr(VI) sensor, this same Zn-MOF can be further recruited as a photocatalyst to convert Cr(VI) to Cr(III). The catalytic reduction is triggered by natural sunlight, acidic pH, and a hole scavenger. In addition, good stability and reusability of the Zn-MOF satisfies the quest for a potential photocatalyst for conversion of Cr(VI) to Cr(III). The limit of detection for fluorometric recognition of Cr(VI) was found to be 4.12 mu M, and almost a complete reduction of toxic Cr(VI) ion was achieved.
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