Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran.
J Environ Health Sci Eng. 2014 Dec 9;12(1):138. doi: 10.1186/s40201-014-0138-y. eCollection 2014.
Nano-sized flower-like Ag/ZnO was synthesized by a simple method using zinc acetate and silver acetate under hydrothermal condition. Powder X-ray diffraction (PXRD) and transmission electron microscopy (TEM) were used to characterize the structure and morphology of the synthesized powder. Nano flower-like Ag/ZnO was used as a photocatalyst for degradation of humic acid in aqueous solution. The disappearance of HA was analyzed by measuring the absorbance of sample at special wavelength (254 nm). The effects of various parameters such as amount of photocatalyst, pH, initial humic acid concentration and irradiation time on degradation rate were systematically investigated. Photodegradation efficiency was small when the photolysis was carried out in the absence of Ag/ZnO and it was also negligible in the absence of light. Approximately 70% of humic acid (50 mg/L) has been eliminated after 40 minutes in the presences of catalyst (catalyst dose o.6 g/L and pH =7) and UVA irradiation. While, 100% of humic acid has been eliminated with solar irradiation.
采用水热法，以醋酸锌和醋酸银为原料，合成了纳米花状 Ag/ZnO。采用粉末 X 射线衍射（PXRD）和透射电子显微镜（TEM）对合成粉末的结构和形态进行了表征。纳米花状 Ag/ZnO 用作光催化剂，用于降解水溶液中的腐殖酸。通过测量样品在特定波长（254nm）处的吸光度来分析 HA 的消失。系统研究了各种参数（如催化剂用量、pH 值、初始腐殖酸浓度和光照时间）对降解率的影响。在没有 Ag/ZnO 的情况下进行光解时，光降解效率很小，在没有光的情况下也可以忽略不计。在催化剂（催化剂剂量 0.6g/L 和 pH=7）和 UVA 照射下，50mg/L 的腐殖酸（50mg/L）在 40 分钟内被去除约 70%。而 100%的腐殖酸在太阳光照射下被去除。
