Study on the management efficiency of lanthanum/iron co-modified attapulgite on sediment phosphorus load

Yihe Qu; Li Zhao; Zhenghai Jin; Haoran Yang; Chengqi Tu; Feifei Che; Mohammad Russel; Xinshan Song; Wei Huang

doi:10.1016/j.chemosphere.2022.137315

Study on the management efficiency of lanthanum/iron co-modified attapulgite on sediment phosphorus load

Chemosphere. 2023 Feb:313:137315. doi: 10.1016/j.chemosphere.2022.137315. Epub 2022 Nov 18.

Authors

Yihe Qu¹, Li Zhao², Zhenghai Jin³, Haoran Yang³, Chengqi Tu³, Feifei Che², Mohammad Russel⁴, Xinshan Song³, Wei Huang⁵

Affiliations

¹ State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, PR China; School of Ocean Science and Technology, Dalian University of Technology, Liaoning Province, Panjin, 124221, PR China.
² National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental, Beijing, 100012, PR China.
³ State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, PR China.
⁴ School of Ocean Science and Technology, Dalian University of Technology, Liaoning Province, Panjin, 124221, PR China.
⁵ State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, PR China; National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental, Beijing, 100012, PR China. Electronic address: huangwei@dhu.edu.cn.

PMID: 36410519
DOI: 10.1016/j.chemosphere.2022.137315

Abstract

Attapulgite co-modified by lanthanum-iron (MT-LHMT) was used to study its effectiveness and mechanism in controlling phosphorus release from sediments. MT-LHMT has high adsorption capacity for phosphate and the maximum adsorption capacity of MT-LHMT to phosphate can reach 75.79 mg/g. The mechanism mainly involved electrostatic action, surface precipitation and ligand exchange between MT-LHMT bonded hydroxyl and phosphate to form La-O-P and Fe-O-P inner-sphere complexes. MT-LHMT has excellent adsorption performance in the pH range of 3-8. In addition to HCO₃^-, CO₃^2- and HA^- had a negative effect on the phosphorus removal of MT-LHMT, while NO₃^-, Cl^-, SO₄^2-, K⁺, Ca²⁺ and Mg²⁺ had a positive or no effect on phosphorus removal. MT-LHMT significantly reduced the risk of phosphorus release from overlying water in different dose effects and covering methods, as well as the unstable inactivation of flowing phosphorus, sediment dissolved reactive phosphorus (DRP) and available phosphorus with medium diffusion gradient in thin film in the sediment-water interface (Labile-P_DGT). The MT-LHMT capping wrapped with fabric can reduce the risk of nitrogen release from sediment to overlying water more than only MT-LHMT capping. The results of this study showed that the MT-LHMT capping wrapped with fabric has high potential and can be used as an active capping material to manage the nitrogen and phosphorus load in surface water.

Keywords: Capping; Magnetic lanthanum/iron co-modified attapulgite; Phosphorus release; Sediment-water interface.

MeSH terms

Geologic Sediments / chemistry
Iron / chemistry
Lakes
Lanthanum / chemistry
Nitrogen
Phosphates
Phosphorus* / chemistry
Water Pollutants, Chemical* / analysis

Substances

Phosphorus
Iron
Lanthanum
attapulgite
Water Pollutants, Chemical
Phosphates
Nitrogen