Water-soluble organic carcinogenic pollutants have become a serious threat to both health and environment. Here, porous ternary spherical montmorillonite/exfoliated graphitic carbon nitride nanosheets/gold nanoparticles (SMt/g-C₃N₄/Au NPs) heterostructures were facile and green synthesized through a polydopamine chemistry method. These involved the coating of porous SMt with exfoliated g-C₃N₄ nanosheets and in situ growth of Au NPs. The prepared heterostructures exhibited a universal catalytic ability toward organic dyes, such as methylene blue (MB), rhodamine 6G, and Congo red, in the presence of sodium borohydride (NaBH₄). The catalytic activity would improve under high SMt/g-C₃N₄/Au NPs concentration, high temperature, and high pH values. For example, the apparent reduction rate constant (k_app) and turnover frequency (TOF) toward MB can reach 5.91 min^–1 and 302 h^–1, respectively, at 35 °C and pH values of 11. Furthermore, the influences of the pH values on the catalytic performance were investigated, and the reason can be attributed to the strong enhanced adsorption capacity of SMt/g-C₃N₄/Au NPs heterostructures toward organic dyes under the high pH values for facilitating electron transfer from NaBH₄ to organic dyes. Moreover, the SMt/g-C₃N₄/Au NPs heterostructures were quite stable, being recycled at least 10 times with almost unchanged k_app. The excellent catalytic performance and recyclability recommend our synthesized SMt/g-C₃N₄/Au NPs heterostructures for a wide range of applications in environment and wastewater treatment.

中文翻译：

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脱落的石墨化氮化碳纳米片/金纳米粒子/球形蒙脱土三元多孔异质结构用于降解有机染料

水溶性有机致癌污染物已成为对健康和环境的严重威胁。在这里，多孔的三元球形蒙脱土/片状石墨氮化碳纳米片/金纳米颗粒（SMt / gC ₃ N ₄ / Au NPs）的异质结构很容易通过聚多巴胺化学方法合成。这些涉及用剥落的gC ₃ N ₄纳米片覆盖多孔SMt并原位生长Au NP。在硼氢化钠（NaBH ₄）存在下，制备的异质结构对亚甲基蓝（MB），若丹明6G和刚果红等有机染料具有普遍的催化能力。在高SMt / gC ₃ N下，催化活性会提高₄ / Au NPs浓度，高温和高pH值。例如，在35°C和11的pH值下，朝向MB的表观还原速率常数（k _app）和周转频率（TOF）分别可以达到5.91 min ^–1和302 h ^–1。研究了pH值对催化性能的影响，其原因可归因于SMt / gC ₃ N ₄ / Au NPs在高pH值下对有机染料的异质吸附能力强，从而促进了电子从NaBH ₄到有机染料的转移。。此外，SMt / gC ₃ N ₄/ Au NPs的异质结构非常稳定，在k _app几乎不变的情况下，至少被回收了10次。出色的催化性能和可回收性推荐我们合成的SMt / gC ₃ N ₄ / Au NPs异质结构可广泛用于环境和废水处理中。