Abstract β-Ni(OH)2/ZnO composite powders were successfully synthesized by hydrothermal method at 180 °C for 15 h whereas NiO/ZnO composite powders formed after the as-prepared powders were calcined at 800 °C for 1 h in air. The X-ray diffractometer (XRD), scanning electron microscope (SEM), UV-Vis spectrophotometer were used to characterize the phase, particle shape as well as size and optical properties, respectively. In this system, it was found that ZnO is a major phase while β-Ni(OH)2 and NiO are a minor phases. The altered particle shape of ZnO was influenced by addition of Ni(CH3COO)2·6H2O whereas the particle shape of the minor phase was changed due to the calcination process. The optical band gap decreased when the amount of minor phase increased. For photocatalytic study, it was found that 6 mol% β-Ni(OH)2/ZnO composite powders exhibited the best decolorization of methylene blue aqueous solution.

中文翻译：

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β-Ni(OH)2/ZnO和NiO/ZnO复合粉末缺陷浓度、光学和光催化性能对相变的依赖性

摘要 采用水热法在 180 ℃ 15 h 下成功合成了 β-Ni(OH)2/ZnO 复合粉末，而制备的粉末在 800 ℃空气中煅烧 1 h 后形成了 NiO/ZnO 复合粉末。X射线衍射仪（XRD）、扫描电子显微镜（SEM）、紫外-可见分光光度计分别用于表征物相、颗粒形状以及尺寸和光学性质。在该系统中，发现 ZnO 是主要相，而 β-Ni(OH)2 和 NiO 是次要相。ZnO 颗粒形状的改变受 Ni(CH3COO)2·6H2O 添加的影响，而次要相的颗粒形状因煅烧过程而改变。当次相量增加时，光学带隙减小。对于光催化研究，