| 铜渣改性制备多孔硅酸盐负载微纳米零价铁及其去除废水中的Cr(VI) |
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| 引用本文： | 胡美世,乐成涛,王淼,张倍贤,郭江凤,余文.铜渣改性制备多孔硅酸盐负载微纳米零价铁及其去除废水中的Cr(VI)[J].矿产保护与利用,2020,40(3):40-45. |
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| 作者姓名： | 胡美世 乐成涛 王淼 张倍贤 郭江凤 余文 |
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| 作者单位： | 江西理工大学 资源与环境工程学院，江西 赣州 341000 |
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| 基金项目： | 中国博士后科学基金;江西省博士后科研项目 |
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| 摘 要： | 本研究以铜渣为原料，通过碳热还原法制备多孔硅酸盐负载型微纳米铁（简称微纳米铁），用于去除废水中的Cr（VI）。研究了微纳米铁的制备条件和废水降解条件对去除Cr（VI）的影响，并探究了相关的反应机理。结果表明，在焙烧温度为1 150℃、焙烧时间为40 min、煤用量为25%的条件下制备的微纳米铁去除Cr（VI）的效率最高。扫描电子显微镜和能谱分析表明，铜渣还原焙烧后形成多孔结构，硅酸盐孔洞表面镶嵌大量纳米级至微米级零价铁颗粒。增加微纳米铁的用量、提高废水温度和降低溶液的初始pH值，可以提高Cr（VI）的去除率。在微纳米铁用量为1 g/L、废水温度为27℃、初始pH为3的条件下，处理浓度为10 mg/L的废水，反应2.5 min即可去除100%的Cr（VI）。机理分析表明，微纳米铁与Cr（VI）发生了氧化还原反应，Cr（VI）被还原生成Cr（Ⅲ）并被矿化为铬铁矿。
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| 关 键 词： | 铜渣 碳热还原 微纳米铁 Cr(VI) |
| 收稿时间： | 2020-05-19 |
Preparation of Porous Silicate Supported Micro-nano ZVI from Copper Slag and Its Application for Removing Cr(VI) From Wastwater |
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| Affiliation: | Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China |
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| Abstract: | In this study, copper slag was treated by carbothermal reduction to prepare of porous silicate supported micro-nano ZVI (micro-nano iron). The effects of roasting conditions and degradation conditions on the performance of micro-nano iron for removing Cr(VI) from wastewater were investigated, and the reaction mechanisms are studied. Results showed that the micro-nano iron prepared under the conditions of calcination temperature of 1 150 ℃, calcination time of 40 min, and coal dosage of 25% presented the best performance for removing Cr(VI). Scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) showed that copper slag forms porous structure after reduction roasting, and a large number of nano-sized to micro-sized ZVI particles were generated on the surface of silicate matrix hole. The Cr(VI) removal process was enhanced by increasing the micro-nano iron dosage and solution temperature, and decreasing the initial pH of the solution. The mechanism analysis shows that the micro-nano iron and Cr(VI) have undergone an oxidation-reduction reaction, and Cr(VI)was reduced to Cr(Ⅲ)and mineralized into chromite. |
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