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二維BiOBr/g-C3N4光催化材料的構(gòu)建及性能研究
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1.內(nèi)蒙古科技大學(xué)材料與冶金學(xué)院 內(nèi)蒙古 包頭;2.晉西工業(yè)集團(tuán)有限責(zé)任公司 山西 太原

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內(nèi)蒙古自然科學(xué)基金(項(xiàng)目號2020MS02025)；國家自然科學(xué)基金資助(項(xiàng)目號21666029);


Construction and photocatalytic property of Two-dimensional BiOBr/g-C3N4 photocatalytic material
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1.School of Materials and Metallurgy,Inner Mongolia University of Science and Technology;2.Jinxi Industries Group Limited Liability Company

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    摘要:

    高效、穩(wěn)定光催化材料的開發(fā)是光催化技術(shù)應(yīng)用的關(guān)鍵，以尿素、硝酸鉍和溴化鉀等為原料，通過一步水熱法制備了BiOBr/g-C3N4（Bix/CN）光催化劑，結(jié)合紫外-可見吸收光譜結(jié)果計(jì)算出BiOBr 和g-C3N4的導(dǎo)帶位置在 0.52eV和-1.1eV，價(jià)帶位置在3.38eV and 1.55eV處，光電催化及熒光測試中Bix/CN表現(xiàn)出較高的光電流和較低的電荷轉(zhuǎn)移電阻，說明復(fù)合可有效降低光催化材料中電子-空穴的復(fù)合率，其中Bi3/CN在可見光輻射10min下，對水溶液中羅丹明B的總?cè)コ士蛇_(dá)到81.35%，循環(huán)使用5次后對RhB的總?cè)コ蕛H下降了6%。復(fù)合材料光催化效率的提高主要依賴于兩種二維單體的有效耦合，光電催化和自由基捕獲實(shí)驗(yàn)結(jié)果表明，g-C3N4導(dǎo)帶上活性物種?O2?的有效生成是復(fù)合材料光催化性能提高的本質(zhì)原因。

    Abstract:

    An The development of efficient and stable photocatalytic materials is the key to the application of photocatalytic technology. In this paper, urea, bismuth nitrate and potassium bromide were used as raw materials, BiOBr/g-C3N4 composite photocatalysts (Bix/CN) with different mass ratios were prepared by one-step hydrothermal method. Based on the results of UV-Vis, the calculated ECB values of BiOBr and g-C3N4 were 0.52eV and -1.1eV, while the calculated EVB values of BiOBr and g-C3N4 were 3.38eV and 1.55eV, respectively. Photoelectric catalytic performance tests showed that Bi3/CN had the higher photocurrent density and lower charge transfer resistance. When the visible light irradiation time was 10 min, the total removal rate of RhB by Bi3/CN was 81.35%. The total removal rate of RhB by Bi3/CN decreased only 6% after reused for 5 times, indicating that Bi3/CN had high and stable photocatalytic efficiency for RhB. The improvement of photocatalytic efficiency of compound photocatalyst mainly depended on the effective coupling of the two-dimensional monomers, and the effective interface contact improved the photogenerated electron transfer and carrier separation efficiency. The photocatalytic enhancement mechanism was proposed as that the accumulated electrons on CB of g-C3N4 for generation of ?O2- were the essential reason for the improvement of photocatalytic performance.

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引用本文

王瑞芬,施凱旋,郭雄,安勝利,宋金玲.二維BiOBr/g-C3N4光催化材料的構(gòu)建及性能研究[J].稀有金屬材料與工程,2023,52(6):2236~2242.[WANG Rui-fen, SHI Kai-xuan, GUO Xiong, AN Sheng-li, SONG Jin-ling. Construction and photocatalytic property of Two-dimensional BiOBr/g-C3N4 photocatalytic material[J]. Rare Metal Materials and Engineering,2023,52(6):2236~2242.]
DOI：10.12442/j. issn.1002-185X.20220395

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  • 收稿日期:2022-05-07
  • 最后修改日期:2022-07-12
  • 錄用日期:2022-08-11
  • 在線發(fā)布日期: 2023-07-07
  • 出版日期: 2023-06-30