A novel green composite catalyst was prepared by doping CuFe₂O₄ nanoparticles in the malt bagasse biochar. Composites with different ratios of malt biochar and CuFe₂O₄ were produced and characterized by XRD, FE-SEM, EDS, HR-TEM, UV–vis, and Zeta potential. The results revealed that CuFe₂O₄ was successfully supported on the malt biochar surface. The prepared composites showed the band gap energies were narrower than of CuFe₂O₄, increasing the photocatalytic activity. At 60 min of heterogeneous photo-Fenton, tests under visible light indicated CuFe₂O₄ removed 39 % of the rhodamine B color, while composites CFO1B3, CFO1B1, and CFO3B1 removed 88 %, 81 %, and 44 % of the dye, respectively. The recycling of the CFO1B3 composite indicated that it can be used in eight cycles without major losses in efficiency. In sunlight, the CFO1B3 composite achieved efficiencies of 100 % for 10 mg L⁻¹ and 50 mg L⁻¹ of rhodamine B at 10 and 20 min of reaction, respectively. In the proposed mechanism, it was verified that the radical OH, O₂⁻ and h⁺ were the predominant reactive species involved in the degradation to intermediates of low m/z. Results showed that the novel composite formed is a promising photocatalyst for removing organic pollutants in water.

通过在麦芽蔗渣生物炭中掺杂CuFe ₂ O ₄纳米粒子，制备了新型绿色复合催化剂。制备了具有不同比例的麦芽生物炭和CuFe ₂ O _4的复合材料，并通过XRD，FE-SEM，EDS，HR-TEM，UV-vis和Zeta电位进行了表征。结果表明，将CuFe ₂ O ₄成功地负载在麦芽生物炭表面上。制备的复合材料显示出带隙能比CuFe ₂ O ₄窄，提高了光催化活性。在60分钟的异质光Fenton上，可见光下的测试表明CuFe ₂ O ₄去除了39％的若丹明B色，而复合材料CFO1B3，CFO1B1和CFO3B1分别去除了88％，81％和44％的染料。CFO1B3复合材料的回收利用表明，它可以在八个循环中使用，而效率没有重大损失。在阳光下，对于10 mg L ^-1和50 mg L ^-1的若丹明B ，CFO1B3复合物在反应10和20分钟时分别达到100％的效率。在所提出的机理，可以确认，自由基OH，O- ₂ ^-和H ⁺参与降解为低的中间体的主要反应种类M / Z。结果表明，形成的新型复合材料是一种有望去除水中有机污染物的光催化剂。