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梁旭華¹,石家豪²，韓非²

（1.唐山市市政建設總公司，河北 唐山 063000；2.河北工業大學，天津 300401）

 

摘 要：將粉煤灰與碳酸鉀混合后焙燒，再浸漬硝酸鑭，制備出鑭改性粉煤灰（La-FA）。通過多種手段對La-FA進行了表征，并研究了其對含磷廢水的吸附性能。結果表明：La-FA表面形成許多孔隙，具有更多吸附位點和羥基官能團，硅和鋁含量的增加。La-FA零點電位的pH值為5.8。當水中磷的質量濃度為30 mg/L、溫度為20℃、pH為4.1時，投加2 g/L的La-FA且吸附時間為20min時，磷去除率可達98%，吸附量為24.13 mg/g。La-FA對磷的吸附過程分為三個階段，符合Langmuir等溫吸附模型和擬二級吸附動力學模型。吸附過程是自發進行的，且為吸熱反應，吸附機理為離子交換。

關鍵詞：粉煤灰；鑭改性；吸附；磷

中圖分類號：X703   

文獻標志碼：A   

文章編號：1005-8249（2024）01-0013-05

DOI：10.19860/j.cnki.issn1005-8249.2024.01.003

LIANG Xuhua¹,SHI Jiahao²,HAN Fei²

（1. Tangshan Municipal Construction Corporation, Tangshan, 063000, China; 2. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin, 300401, China）

 

Abstract: Lanthanum-modified fly ash (La-FA) was prepared by mixing fly ash with potassium carbonate and impregnating lanthanum nitrate. It was characterized by various means and used in the adsorption of phosphorous-containing wastewater. The surface of La-FA has many pores and more adsorption sites and hydroxyl functional groups, and the content of silicon and aluminum was increased to facilitate the adsorption of phosphorus. The increase in pH caused the potential of the La-FA surface to gradually decrease, and its zero potential has a pH of 5.8. The adsorption results showed that when the initial phosphorus mass concentration was 30 mg/L, the temperature was 20 °C, the solution pH was 4.1, the La-FA dosage was 2 g/L, and the adsorption time was 20 min, the phosphorus removal rate reached 98%, and the adsorption capacity was 24.13 mg/g. The adsorption process of La-FA on phosphorus can be divided into three stages, which conform to the Langmuir isothermal adsorption model and quasi-secondary kinetic model, the adsorption can be carried out spontaneously, the reaction process is endothermic, and the adsorption mechanism is ion exchange.

Keywords: fly ash; Lanthanum modified; adsorption; phosphorus    

 

*基金項目：國家自然科學基金（51608165）。

作者簡介：梁旭華（1973—），女，本科，高級工程師，主要研究方向：水處理工程。

通信作者：韓非（1981—），男，博士，副教授，主要研究方向：水處理新材料新工藝。