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Photocatalytic Reduction of Hexavalent Chromium (Cr6+) Over BiOI Calcined at Different Temperature Under Visible Light Irradiation
ChemistrySelect ( IF 1.9 ) Pub Date : 2021-06-22 , DOI: 10.1002/slct.202101285 Adinas Oswald Kivyiro 1 , Williams Kweku Darkwah 1, 2 , Robert Bofah‐Buoh 1 , Desmond Ato Koomson 1, 2 , Masso Kody Christelle Sandrine 1 , Joshua Buer Puplampu 2
ChemistrySelect ( IF 1.9 ) Pub Date : 2021-06-22 , DOI: 10.1002/slct.202101285 Adinas Oswald Kivyiro 1 , Williams Kweku Darkwah 1, 2 , Robert Bofah‐Buoh 1 , Desmond Ato Koomson 1, 2 , Masso Kody Christelle Sandrine 1 , Joshua Buer Puplampu 2
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Synthesis of photocatalysts with high charge separation and transfer efficiency are of huge significance in the photocatalytic waste water treatment technology. Herein, we report the phase transformation of bismuth oxyiodide through the facile calcination of BiOI microsphere at different temperatures. Different phases including BiOI, Bi4O5I2 and Bi5O7I were obtained as confirmed by different characterization techniques studied. The synthesized photocatalysts depicted high visible light absorption efficiency in a range of ∼ 655 to 420 nm. The photocatalytic activity of the synthesized photocatalyst were studied on the reduction of the highly carcinogenic and toxic hexavalent chromium as the representative heavy metal in waste water. Bi4O5I2 depicted high photocatalytic activity (k=0.0366 min−1) which was ascribed to high charge separation and transfer as evidenced in PL, photocurrent response and EIS. This study may furnish a new concept in designing a series of phases that are more advantageous in solar energy conversion.
中文翻译：
可见光照射下不同温度煅烧BiOI光催化还原六价铬(Cr6+)
合成具有高电荷分离和转移效率的光催化剂在光催化废水处理技术中具有重要意义。在此，我们通过 BiOI 微球在不同温度下的轻松煅烧报告了碘氧化铋的相变。不同的相，包括 BiOI、Bi 4 O 5 I 2和 Bi 5 O 7我是通过研究的不同表征技术获得的。合成的光催化剂在~655 至 420 nm 范围内具有高可见光吸收效率。对合成的光催化剂的光催化活性进行了研究，以减少废水中具有高致癌性和毒性的六价铬作为代表性重金属。Bi 4 O 5 I 2 表现出高光催化活性（k=0.0366 min -1），这归因于高电荷分离和转移，如PL、光电流响应和EIS所证明的。这项研究可能为设计一系列在太阳能转换中更有优势的阶段提供一个新的概念。
更新日期：2021-06-22
中文翻译：
可见光照射下不同温度煅烧BiOI光催化还原六价铬(Cr6+)
合成具有高电荷分离和转移效率的光催化剂在光催化废水处理技术中具有重要意义。在此，我们通过 BiOI 微球在不同温度下的轻松煅烧报告了碘氧化铋的相变。不同的相，包括 BiOI、Bi 4 O 5 I 2和 Bi 5 O 7我是通过研究的不同表征技术获得的。合成的光催化剂在~655 至 420 nm 范围内具有高可见光吸收效率。对合成的光催化剂的光催化活性进行了研究，以减少废水中具有高致癌性和毒性的六价铬作为代表性重金属。Bi 4 O 5 I 2 表现出高光催化活性（k=0.0366 min -1），这归因于高电荷分离和转移，如PL、光电流响应和EIS所证明的。这项研究可能为设计一系列在太阳能转换中更有优势的阶段提供一个新的概念。
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