摘要
本研究以水热法制备二维磷酸锆纳米片,对其微观结构及成分表征显示,制得的纳米片为正六边形片状结构,粒径大小为724±120nm,具有较高的表面电荷密度,Zeta电位值高达-55.39mV。二维磷酸锆纳米片能够有效调控纳米氧化锌分散液的紫外可见吸收光谱、能带间隙和Zeta电位。磷酸锆调控氧化锌的光催化研究结果表明:调节磷酸锆的添加量,可使氧化锌在保持稳定分散的同时,能有效地调控对亚甲基蓝的光催化降解。原因是:当磷酸锆的添加量较少时,能促进氧化锌的分散,从而增强其光催化效果;而当磷酸锆的添加量过多时,入射的紫外可见光被大尺寸磷酸锆纳米片屏蔽,从而抑制其光催化的能力。实验表明,当磷酸锆浓度为0.07mg/mL时,氧化锌的催化效果最好,超过该浓度后催化效果下降。
Two-dimensional zirconium phosphate nanoplates were prepared by hydrothermal method. The characterization of the nanoplates suggests that the nanoplatesare regular hexagonal lamellar structured with a size of 724±120 nm and high surface charge density. The Zeta potential value is up to-55.39 mV. The two-dimensional zirconium phosphate nanoplates could effectively control the UV-vis absorption spectra, energy gap and Zeta potentials of nanometer zinc oxide dispersions. The photocatalytic results show that the addition of zirconium phosphate can effectively adjust the photocatalytic degradation of methylene blue while maintaining stable dispersion. The reason for this phenomenon is that small addition of zirconium phosphate nanoplates can promote the photocatalytic effect of ZnO by improving the dispersion stability of ZnO colloids, and large addition of it shield the incident ultraviolet visible light and inhibit the photocatalytic effect of ZnO. Results shows the catalytic effect of zinc oxide reach the best level when the concentration of zirconium phosphate is 0.07 mgmL~(-1), the catalytic effect tends to decrease when the zirconium phosphate concentration exceeds 0.07 mgmL~(-1).
引文
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