| 铈改性水葫芦生物炭对磷酸盐的吸附特性 |
| 摘要点击 2156 全文点击 723 投稿时间：2021-02-09 修订日期：2021-03-31 |
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| 中文关键词 水葫芦生物炭 氧化铈 磷回收 固定床 吸附再生 |
| 英文关键词 water hyacinth biochar cerium oxide phosphorus recovery fixed bed adsorption regeneration |
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| 中文摘要 |
| 本研究通过共浸渍-热解法开发了一种铈改性水葫芦生物炭吸附剂（Ce-BC），用以去除实际废水中的磷酸盐，考察了Ce-BC投加量、废水pH值、反应时间及共存的竞争性离子对吸附过程的影响.结果表明，当Ce-BC投加量为0.4 g·L-1，初始磷酸盐溶液pH值介于3~10时，Ce-BC对磷酸盐的吸附性能最佳，最大吸附量达到35.00 mg·g-1.Ce-BC对磷酸盐的吸附过程符合准二级动力学模型，并能在1 h内达到98%的磷酸盐去除率，吸附速率快.此外，Ce-BC具有较高的抗阴离子干扰能力，且具有良好的再生性能，Ce-BC经过4次再生后仍能保持90%以上的初始吸附效率.场发射扫描电镜-能量色散光谱（FESEM-EDS）、傅里叶红外光谱（FTIR）、X射线衍射光谱（XRD）和X射线光电子能谱（XPS）等表征结果表明，Ce-BC对磷酸盐的吸附机制主要包括配体交换和内球络合.本研究制备的Ce-BC吸附剂，可以有效去除及回收实际生活污水中的磷酸盐，在避免水体富营养化的同时实现磷资源的回收利用. |
| 英文摘要 |
| A cerium-modified water hyacinth biochar adsorbent(Ce-BC) was developed through co-precipitation-pyrolysis to remove phosphate from wastewater. The study investigated the effects of Ce-BC dosing, wastewater pH, reaction time, and coexisting competing ions on the adsorption process. The results showed that the best adsorption performance was achieved with a maximum adsorption capacity of 35.00 mg·g-1 at a Ce-BC dosage of 0.4 g·L-1 and an initial pH range of 3-10 in the phosphate solution. The adsorption process of phosphate by the Ce-BC followed the quasi-second-order kinetic model, and a phosphate removal efficiency of 98% within 1 h was achieved. In addition, Ce-BC had a strong anti-competitive anion interference and a good regeneration ability; after four cycles of regeneration, the adsorption efficiency remained above 90%. Characterization using field emission scanning electron microscopy-energy dispersive spectrometry(FESEM-EDS), Fourier-transform infrared spectroscopy(FTIR), X-ray diffraction(XRD), and X-ray photoelectron spectroscopy(XPS) showed that the adsorption mechanism of Ce-BC with respect to phosphate mainly involved ligand exchange and inner sphere complexation. The Ce-BC adsorbent prepared in this study effectively removed and recovered phosphates found in domestic sewage, thereby avoiding the eutrophication of water bodies as well as enabling the recovery and utilization of phosphorus resources. |
