We report the design and synthesis of Nb₂O₅@diatomite composite materials. The composite materials are prepared by the hydrothermal conversion of raw diatomite and activated niobic acid powder in ammonium oxalate aqueous solution, with various hydrothermal reaction durations. The specific surface area of the diatomite modified by Nb₂O₅ nanorods reaches a maximum of 153 m²/g, which is almost five times higher than that of raw diatomite. Insights are gained into the function of sodium dodecyl benzene sulfonate and the mechanism of loading Nb₂O₅ on diatomite in the solution phase. The controllable growth dynamics allow the morphology and production of the Nb₂O₅@diatomite structure to be controlled. Adsorption experiments indicate that the diatomite modified by Nb₂O₅ nanorods is an effective adsorbent for quickly removing Cr(VI) from wastewater at room temperature. The maximum adsorption capacity is 115 mg/g. The Cr(VI) removal capacity is further improved under ultraviolet light irradiation, owing to the synergistic effect of surface adsorption and Nb₂O₅ photoreduction. The composite therefore has potential practical application.

我们报告了Nb ₂ O ₅ @硅藻土复合材料的设计和合成。通过在不同的水热反应持续时间下，将粗制的硅藻土和活化的铌酸粉末在草酸铵水溶液中进行水热转化来制备复合材料。Nb ₂ O ₅纳米棒改性的硅藻土的比表面积最大为153 m ² / g，几乎是原始硅藻土的五倍。对十二烷基苯磺酸钠的功能以及溶液相中硅藻土上负载Nb ₂ O ₅的机理有了深入的认识。可控的生长动力学允许Nb的形态和产生₂ O ₅硅藻土的结构得到控制。吸附实验表明，Nb ₂ O ₅纳米棒修饰的硅藻土是在室温下快速去除废水中六价铬的有效吸附剂。最大吸附容量为115 mg / g。由于表面吸附和Nb ₂ O _5光还原的协同作用，在紫外线照射下，Cr（VI）的去除能力进一步提高。因此该复合材料具有潜在的实际应用。