镧改性碳纤维对水体中磷的吸附性能

陈安童; 张鹏; 夏江楠; 杨瑾晟; 赵浩; 赵贤广

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (7) : 3742-3752.

水污染与控制

镧改性碳纤维对水体中磷的吸附性能

陈安童¹, 张鹏^1,2, 夏江楠¹, 杨瑾晟^2,3, 赵浩¹, 赵贤广¹

作者信息 +

Lanthanum-modified carbon fibers for enhanced phosphorus adsorption.

CHEN An-tong¹, ZHANG Peng^1,2, XIA Jiang-nan¹, YANG Jin-sheng^2,3, ZHAO Hao¹, ZHAO Xian-guang¹

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文章历史 +

摘要

利用镧浸渍法处理活性碳纤维制备出了新型高效磷酸根吸附剂(CF-La).并进行了吸附等温线、吸附动力学、单因素实验、实际水样试验.吸附等温线实验表明其吸附过程更符合Langmuir模型,吸附属于单层吸附,在333K时吸附容量最大为5.78mg/g,20℃吸附容量为5.31mg/g;动力学实验表明CF-La吸附过程符合二级动力学模型,包含物理、化学吸附;pH和竞争离子实验表明,CF-La在中性环境下吸附效果最佳且不受干扰离子影响,5种阴离子对CF-La的影响顺序为:S^2-＞SO₄^2-＞CO₃^2-＞Cl^-≈NO₃^-;通过5次吸附-解吸循环实验进行可回收性评价,结果表明CF-La对磷酸根的吸附率和脱附率均保持在80%以上;通过SEM、BET对改性前后材料进行表征,表明镧已成功负载在材料表面;XPS、FTIR对吸附前后材料进行吸附机理分析,表明合成材料具有介孔结构且表面存在两种不同价态的镧有利于提高吸附效果.通过实际水样试验,验证了CF-La对安徽巢湖水体中无机磷、有机磷均体现出优异的吸附性能,吸附10h后夏季和冬季的巢湖水样均可降低至蓝藻水华发生阈值内.

Abstract

A novel efficient phosphate adsorbent (CF-La) was synthesized by treating activated carbon fibers using lanthanum with impregnation method. The adsorption isotherms, adsorption kinetics, one-way experiments, and actual water sample tests were carried out. The adsorption isotherm studies demonstrated that the adsorption process conforms to the Langmuir model, indicating monolayer adsorption, with the maximum adsorption capacity of 5.78mg/g at 333K. Kinetic analyses revealed that the adsorption process follows the pseudo-second-order kinetic model, involving both physical and chemical adsorption mechanisms. The pH and competitive ions experiments indicated that the best adsorption effect was achieved under neutral environment, and the best adsorption result was achieved under neutral condition. The effects of five anions on CF-La were in the following order: S^2-＞ SO₄^2- ＞CO₃^2-＞ Cl^-≈NO₃^-. The recyclability assessment through five adsorption-desorption cycles showed that CF-La retained ＞80% adsorption and desorption efficiency. By conducting characterization with SEM and BET on the modified material before and after, it is confirmed that lanthanum has been successfully loaded onto the surface. Analysis of the materials before and after adsorption using XPS and FTIR indicates that the synthesized material features a mesoporous structure, and the presence of lanthanum in two different oxidation states on the surface is beneficial for enhancing the adsorption efficiency. The experiment on sample water verified that CF-La showed excellent adsorption performance on inorganic phosphorus and organic phosphorus in Chaohu Lake, Anhui Province, and the water samples from Chaohu Lake in summer and winter could be reduced to within the threshold of cyanobacterial bloom after adsorption for 10h.

导出引用

陈安童, 张鹏, 夏江楠, 杨瑾晟, 赵浩, 赵贤广. 镧改性碳纤维对水体中磷的吸附性能[J]. 中国环境科学. 2025, 45(7): 3742-3752

CHEN An-tong, ZHANG Peng, XIA Jiang-nan, YANG Jin-sheng, ZHAO Hao, ZHAO Xian-guang. Lanthanum-modified carbon fibers for enhanced phosphorus adsorption.[J]. China Environmental Science. 2025, 45(7): 3742-3752

中图分类号： X703.5

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