| 聚合氯化铝-镧改性膨润土的制备及除磷除藻研究 |
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| 引用本文： | 慕利梅,王图锦,曹琳,许国静.聚合氯化铝-镧改性膨润土的制备及除磷除藻研究[J].环境科学研究,2022,35(6):1450-1457. |
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| 作者姓名： | 慕利梅 王图锦 曹琳 许国静 |
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| 作者单位： | 1.重庆交通大学河海学院，重庆 400074 |
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| 基金项目： | 重庆市技术创新与应用发展专项面上项目(No.2019jscx-msxmX0169)；重庆市技术创新与应用示范项目(No.2018jscx-msybX0307) |
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| 摘 要： | 为快速去除富营养化水体中的磷和藻类，采用PAC(聚合氯化铝)和镧对膨润土进行复合改性，制备PLMB(聚合氯化铝-镧改性膨润土)吸附剂，并采用BET(全自动比表面及孔隙度分析仪)、SEM(扫描电镜)、FTIR(傅里叶红外光谱仪)、XRD(X射线衍射仪)、ICP-OES(电感耦合等离子发射光谱仪)和zeta电位分析仪对材料进行表征，使用吸附动力学和吸附等温线描述PLMB对磷的吸附机理，考察吸附剂用量、pH和腐殖酸对PLMB同步除磷除藻的影响. 结果表明:①PLMB表面具有很多层状结构，能够提供更多吸附位点，聚合氯化铝和镧成功负载于膨润土上，镧含量达到5.02%. ②PLMB能高效吸附水中的磷，吸附量达到57.629 mg/g，吸附等温线符合Langmuir等温吸附模型，吸附动力学符合颗粒内扩散模型和准二级动力学模型. ③当PLMB投加量为300 mg/L时，富营养化水样中浊度、SRP(可溶性活性磷)、TP(总磷)和Chla(叶绿素a)的去除率分别为98.7%、96.2%、94.1%和72.7%. ④水样pH为5~10时，pH增大对PLMB的除磷除藻性能具有促进作用. ⑤腐殖酸对SRP的去除无显著影响，对浊度、TP和Chla的去除有负面作用. 研究显示，PLMB表现出优异的磷吸附性能，能够同步去除水体中的磷和藻类，在富营养化水体的生态修复中具有较大应用价值.
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| 关 键 词： | 富营养化 改性 聚合氯化铝 除磷 除藻 |
| 收稿时间： | 2021-09-15 |
Preparation of Polyaluminum Chloride-Lanthanum Modified Bentonite and Study on Phosphorus and Algae Removal |
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| Affiliation: | 1.School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China2.China Merchants Ecological Environment Protection Technology Co., Ltd., Chongqing 400067, China |
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| Abstract: | The polyaluminium chloride-lanthanum modified bentonite (PLMB) adsorbent was prepared to quickly remove phosphorus and algae from eutrophic water. The materials were characterized by BET, SEM, FTIR, XRD, ICP-OES and zeta potential analyzer. The adsorption mechanism of phosphorus was described by adsorption kinetic and adsorption isotherms, and the influence of adsorbent dosage, pH and humic acid on phosphorus and algae removal efficiency were investigated. The results showed that: (1) There were many voids and layered structures on the surface of PLMB, which can provide more adsorption sites. The lanthanum content reached 5.02%. (2) PLMB can efficiently adsorb phosphorus in water, and the maximum adsorption capacity was 57.629 mg/g; the adsorption isotherm fitted the Langmuir model well, and the adsorption kinetics agreed with the intra-granular diffusion model and pseudo-second order kinetic model. (3) At the dosage of 300 mg/L PLMB, the removal rates of turbidity, SRP, TP and chlorophyll a in eutrophic water were 98.7%, 96.2%, 94.1% and 72.7%, respectively. (4) When pH was in the range of 5 to 10, the phosphorus and algae removal efficiency increased with the increase of pH value. (5) Humic acid had no significant effect on the removal of SRP, but had a certain negative effect on the removal of turbidity, TP and chlorophyll a. In summary, PLMB exhibits excellent phosphorus adsorption performance and can simultaneously remove phosphorus and algae from eutrophic water; Thus, PLMB has certain application value in the ecological recovery of eutrophic water. |
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