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Metal free MoS2 2D sheets as a peroxidase enzyme and visible-light-induced photocatalyst towards detection and reduction of Cr(vi) ions†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-09-12 00:00:00 , DOI: 10.1039/c8nj03996h Priyakshree Borthakur 1, 2, 3, 3, 4 , Purna K. Boruah 1, 2, 3, 3, 4 , Manash R. Das 1, 2, 3, 3, 4 , Sofya B. Artemkina 5, 6, 7, 8 , Pavel A. Poltarak 5, 6, 7, 8, 9 , Vladimir E. Fedorov 5, 6, 7, 8, 9
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-09-12 00:00:00 , DOI: 10.1039/c8nj03996h Priyakshree Borthakur 1, 2, 3, 3, 4 , Purna K. Boruah 1, 2, 3, 3, 4 , Manash R. Das 1, 2, 3, 3, 4 , Sofya B. Artemkina 5, 6, 7, 8 , Pavel A. Poltarak 5, 6, 7, 8, 9 , Vladimir E. Fedorov 5, 6, 7, 8, 9
Affiliation
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Two-dimensional molybdenum disulphide (MoS2) sheets were prepared by using simple thermal decomposition method. The synthesized sheets were characterized by different analytical tools including FTIR, XRD, XPS, Raman spectroscopy, HRTEM and FESEM analyses. The synthesized sheets exhibited outstanding peroxidase mimicking activity towards the peroxidase oxidation of chromogenic probe molecule 3,3′,5,5′-tetramethyl benzidine (TMB), producing a blue coloured solution of 3,3′,5,5′-tetramethylbenzidine diimine (TMBDI) in an acidic medium (pH 4). Based on this peroxidase mimicking activity it was utilized for colorimetric determination of toxic Cr(VI) ions present in aqueous medium. The MoS2 sheets showed excellent sensitivity towards Cr(VI) detection with a lower detection limit of 40.09 nM. Moreover, these 2D sheets also acted as an excellent photocatalyst because of their direct band gap of 1.90 eV, and were used for the reduction of inorganic toxic pollutant Cr(VI) ions to environmentally benign Cr(III) ions under the irradiation of visible light. MoS2 sheets showed 98% photo reduction efficiency towards Cr(VI) ions within 20 min. Furthermore, the synthesized MoS2 sheets were successfully recycled up to five times without significant decrease of their photocatalytic reduction efficiency towards Cr(VI) ions. The present study demonstrates that metal free MoS2 sheets prepared by a simple solid state synthesis approach provide a simple, cost-effective and easy method for determination and removal of toxic Cr(VI) ions in aqueous medium.
中文翻译：
无金属的MoS 2 2D薄板作为过氧化物酶和可见光诱导的光催化剂，用于检测和还原Cr（vi）离子†
采用简单的热分解方法制备了二维二硫化钼（MoS 2）片。通过不同的分析工具，包括FTIR，XRD，XPS，拉曼光谱，HRTEM和FESEM分析，对合成板材进行了表征。合成的薄片对发色探针分子3,3'，5,5'-四甲基联苯胺（TMB）的过氧化物酶氧化表现出出色的过氧化物酶模拟活性，产生3,3'，5,5'-四甲基联苯胺二亚胺的蓝色溶液（TMBDI）在酸性介质（pH 4）中。基于该过氧化物酶模拟活性，将其用于比色测定水性介质中存在的有毒Cr（VI）离子。MoS 2片材显示出对Cr（VI）检测下限为40.09 nM。此外，这些二维片材的直接带隙为1.90 eV，因此它们也是出色的光催化剂，并用于在可见光照射下将无机有毒污染物Cr（VI）离子还原为对环境无害的Cr（III）离子。 。MoS 2片材在20分钟内对Cr（VI）离子显示98％的光还原效率。此外，合成的MoS 2薄板成功回收了五次，而对Cr（VI）离子的光催化还原效率没有明显降低。本研究表明，无金属的MoS 2通过简单的固态合成方法制备的薄板提供了一种简单，经济高效的简便方法，用于测定和去除水性介质中的有毒Cr（VI）离子。
更新日期：2018-09-12
中文翻译：
无金属的MoS 2 2D薄板作为过氧化物酶和可见光诱导的光催化剂，用于检测和还原Cr（vi）离子†
采用简单的热分解方法制备了二维二硫化钼（MoS 2）片。通过不同的分析工具，包括FTIR，XRD，XPS，拉曼光谱，HRTEM和FESEM分析，对合成板材进行了表征。合成的薄片对发色探针分子3,3'，5,5'-四甲基联苯胺（TMB）的过氧化物酶氧化表现出出色的过氧化物酶模拟活性，产生3,3'，5,5'-四甲基联苯胺二亚胺的蓝色溶液（TMBDI）在酸性介质（pH 4）中。基于该过氧化物酶模拟活性，将其用于比色测定水性介质中存在的有毒Cr（VI）离子。MoS 2片材显示出对Cr（VI）检测下限为40.09 nM。此外，这些二维片材的直接带隙为1.90 eV，因此它们也是出色的光催化剂，并用于在可见光照射下将无机有毒污染物Cr（VI）离子还原为对环境无害的Cr（III）离子。 。MoS 2片材在20分钟内对Cr（VI）离子显示98％的光还原效率。此外，合成的MoS 2薄板成功回收了五次，而对Cr（VI）离子的光催化还原效率没有明显降低。本研究表明，无金属的MoS 2通过简单的固态合成方法制备的薄板提供了一种简单，经济高效的简便方法，用于测定和去除水性介质中的有毒Cr（VI）离子。
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