A new visible-light-induced Z-scheme photocatalytic system, Er³⁺:Y₃Al₅O₁₂/(MoS₂/NiGa₂O₄)-(BiVO₄/PdS), is designed and prepared by using hydrothermal and mixed-calcination methods And the prepared samples are characterized by X-ray diffractometer (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) and UV–vis absorption spectra. The photocatalytic activity is evaluated towards Orange G degradation with simultaneous hydrogen evolution under visible-light irradiation. The photocatalytic experiments indicate that the Er³⁺:Y₃Al₅O₁₂/(MoS₂/NiGa₂O₄)-(BiVO₄/PdS) as photocatalyst displays very high photocatalytic activity. It can be ascribed to two sides. One is the use of Er³⁺:Y₃Al₅O₁₂ offering ultraviolet-light to activate the wide-band gap NiGa₂O₄. Another is the construction of Z-scheme system between NiGa₂O₄ and BiVO₄ which can result in a more efficient separation of photoexicited charge carriers, thus endowing it with much powerful oxidation and reduction capabilities. Moreover, the reusability study shows that the prepared photocatalyst can be effectively recycled for three repetitive cycles without an apparent deactivation. In addition, the possible Z-scheme mechanism of Er³⁺:Y₃Al₅O₁₂/(MoS₂/NiGa₂O₄)-(BiVO₄/PdS) is also proposed, and further evidenced by photoluminescence (PL) spectra. The present work not only designs a new photocatalytic system but also well applies in photocatalytic degradation of refractory pollutant with simultaneous hydrogen evolution.

利用水热混合法设计并制备了一种新型的可见光诱导的Z方案光催化体系Er ³⁺：Y ₃ Al ₅ O ₁₂ /（MoS ₂ / NiGa ₂ O ₄）-（BiVO ₄ / PdS）。煅烧方法制备的样品通过X射线衍射仪（XRD），能量色散X射线光谱仪（EDX），扫描电子显微镜（SEM），透射电子显微镜（TEM），傅立叶变换红外光谱（FTIR）和紫外可见吸收光谱。评价了在可见光照射下同时析氢对橙色G降解的光催化活性。光催化实验表明作为光催化剂的³⁺：Y ₃ Al ₅ O ₁₂ /（MoS ₂ / NiGa ₂ O ₄）-（BiVO ₄ / PdS）显示出非常高的光催化活性。它可以归因于两个方面。一种是使用提供紫外线的Er ³⁺：Y ₃ Al ₅ O ₁₂来激活宽带隙NiGa ₂ O ₄。另一个是在NiGa ₂ O ₄和BiVO ₄之间构建Z方案系统这样可以更有效地分离光激发的载流子，从而使其具有强大的氧化和还原能力。此外，可重复使用性研究表明，所制备的光催化剂可以有效地循环使用三个重复循环，而不会出现明显的失活。此外，Er ³⁺：Y ₃ Al ₅ O ₁₂ /（MoS ₂ / NiGa ₂ O ₄）-（BiVO ₄）的可能Z机理/ PdS），并且进一步由光致发光（PL）光谱证明。目前的工作不仅设计了一种新的光催化体系，而且还很好地应用于难降解污染物的光催化降解和同时析氢。