Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Theresienstr. 41, 80333, Munich, Germany.
Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Theresienstr. 41, 80333, Munich, Germany.
Water Res. 2016 Sep 1;100:98-104. doi: 10.1016/j.watres.2016.04.071. Epub 2016 May 4.
In this study we present a new, environmental friendly and economic method, called Lt-delafossite process to treat industrial wastewater (initial Cu(2+)-concentrations of 1-15.6 g/l) by subsequent synthesis of nano-crystalline (doped) delafossite (CuFeO2) solely by precipitation and ageing at temperatures between 50 °C and 90 °C. The reached water purification rates are exclusively ≥99.99% for both wastewater models and wastewaters from electroplating industry. We succeeded to synthesize a mixture of 3R and 2H delafossite at 50 °C after 90 h and ≥70 °C after 16 h of ageing directly from industrial wastewater without any additional phases. In all cases green rust (GR), a Fe(II-III) layered double hydroxysulphate, Cu2O (cuprite) and Fe10O14(OH)2 (ferrihydrite) precipitates first. During ageing of the residues the metastable phases transform to delafossite. The residues are characterized by XRD, FTIR, SEM, TEM, VFTB and Mößbauer measurements.
在这项研究中，我们提出了一种新的、环保且经济的方法，称为 Lt-水铝氧石工艺，用于处理工业废水（初始 Cu(2+)-浓度为 1-15.6 g/l），通过沉淀和在 50°C 至 90°C 之间的老化来合成纳米晶（掺杂）水铝氧石（CuFeO2）。对于两种废水模型和电镀工业废水，达到的水净化率均≥99.99%。我们成功地在 50°C 下经过 90 小时和在 70°C 下经过 16 小时的老化，直接从工业废水中合成了 3R 和 2H 水铝氧石的混合物，无需任何额外的相。在所有情况下，绿色锈（GR）、Fe(II-III)层状双氢氧化物硫酸盐、Cu2O（氧化亚铜）和 Fe10O14(OH)2（水铁矿）首先沉淀。在残留物的老化过程中，亚稳相转化为水铝氧石。残留物通过 XRD、FTIR、SEM、TEM、VFTB 和 Mössbauer 测量进行表征。
