| 刘甜,郭军康,张蕾,王孜昊,喻先伟,王家圆,毕江涛.煤基NaA分子筛材料的合成及其对Cd2+的吸附[J].农业环境科学学报,2023,42(2):443-450. |
| 煤基NaA分子筛材料的合成及其对Cd2+的吸附 |
| Synthesis of coal-based NaA molecular sieve material and Cd2+ adsorption |
| 投稿时间：2022-09-30 |
| DOI：10.11654/jaes.2022-0971 |
| 中文关键词: 煤矸石 分子筛 Cd2+ 吸附 固废资源化 |
| 英文关键词: coal gangue molecular sieve Cd2+ adsorption solid waste recycling |
| 基金项目:国家自然科学基金项目（41977274）；陕西省科技创新团队项目（2022TD-09）；陕西省重点产业链项目（2022ZDLNY02-02） |
|
| 摘要点击次数: 945 |
| 全文下载次数: 1075 |
| 中文摘要: |
| 为实现废弃物资源化利用，采用煤矸石为原料制备分子筛环境修复材料。通过对煤矸石（CG）的硅铝比进行调节，利用煅烧-水热晶化法分别在500℃和750℃下成功合成了NaA-500和NaA-750两种煤基NaA分子筛材料。进一步采用X射线衍射（XRD）、扫描电镜（SEM）等表征方法探讨了分子筛的结构特征和表观形貌，并对吸附过程进行吸附动力学和等温吸附线的研究分析，以深入探究其对Cd2+的吸附特性。结果表明：相比煤矸石，NaA-750和NaA-500对Cd2+的最高吸附量分别为392.9 mg·g-1和208.9 mg·g-1，分别是煤矸石的4.5倍和2.4倍，且NaA-750和NaA-500对Cd2+的吸附过程遵循准二级动力学规律。吸附等温线结果显示，NaA-500和NaA-750对Cd2+的吸附符合Langmuir等温吸附模型。综上所述，以煤矸石为原料制备的NaA型分子筛对Cd2+的吸附能力明显提升且具有较高的吸附容量，对去除废水中Cd2+具有潜在应用价值。 |
| 英文摘要: |
| To realize waste resource utilization, coal gangue has been applied as a raw material to produce molecular sieve environmental remediation materials. NaA-500 and NaA-750 have been successfully synthesized by adjusting the silica-alumina ratio of coal gangue through calcination-hydrothermal crystallization approach at two temperature of 500℃ and 750℃, respectively. The structural characteristics and apparent morphology of the molecular sieves were further investigated using X-ray diffraction(XRD) and scanning electron microscope(SEM) characterization techniques. The adsorption kinetics and isotherm models were employed to evaluate the Cd2+ adsorption behavior on the synthesized materials. The maximum adsorption capacity of both coal-based molecular sieve materials towards Cd2+ increased significantly, compared with that of coal gangue. The maximum Cd2+ adsorption capacity of NaA-750 was 392.9 mg·g-1, and that of NaA-500 was 208.9 mg·g-1, which were 4.5 times and 2.4 times that of coal gangue. The NaA-500 and NaA-750 experimental results showed that the pseudo-second-order models and Langmuir isotherm model were more suitable for fitting the experimental data, respectively. In conclusion, the adsorption performance of NaA molecular sieve which prepared from coal gangue to Cd2+ is significantly improved and with high adsorption capacity, indicating that NaA molecular sieve has potential application value for the removal of Cd2+ from wastewater. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
