Citation: Yueyue DU, Yuwei ZHENG, Xuanhe WEI, Yifan LU, Yingchao HAN. Sodium alginate/nano lanthanum hydroxide composite microspheres: Electrospraying preparation and phosphorus adsorption performance[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(8): 1669-1684. doi: 10.11862/CJIC.20260002 shu

Sodium alginate/nano lanthanum hydroxide composite microspheres: Electrospraying preparation and phosphorus adsorption performance

Yueyue DU ^{1, 2} ,
Yuwei ZHENG ^{1, 2} ,
Xuanhe WEI ^{1, 2} ,
Yifan LU ^{1, 2} ,
Yingchao HAN ^{1, 3,,}

1.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
2.
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
3.
Biomedical Materials and Engineering Research Center of Hubei, Wuhan University of Technology, Wuhan 430070, China

Corresponding author: Yingchao HAN, hanyingchao@whut.edu.cn
Received Date: 4 January 2026
Revised Date: 22 June 2026

Figures(16)

Nano lanthanum hydroxide (n-LH) was prepared into SA/n-LH composite microspheres with sodium alginate (SA) as the encapsulation material by microencapsulation technology. The effects of electrospray process parameters, including receiving distance, inner diameter of needle, voltage, injection rate, SA mass concentration, LaCl₃ mass concentration, crosslinking time, and the mass ratio of n-LH to SA (r_m), on the particle size and morphology of SA/n-LH composite microspheres were studied. The phosphorus adsorption capacity of SA/n-LH composite microspheres and its related mechanisms were further explored. Along with the increase in needle inner diameter, SA concentration and r_m, and the decrease in voltage, the particle size of SA/n-LH composite microspheres increased. Especially, at a voltage of 15 kV, microsphere particle size became non-uniform, and excessively high SA concentration and n-LH content might cause the change of microsphere morphology. The phosphorus adsorption capacity of the SA/n-LH composite microspheres reached the maximum at a pH value of 2.0; as the pH increased, the phosphorus adsorption capacity decreased significantly. As the r_m increased, the phosphorus adsorption capacity increased significantly. When the pH was 2.0 and the r_m was 2.0, the phosphorus adsorption capacity reached 111.05 mg·g^-1. The phosphorus adsorption process of SA/n-LH microspheres better conformed to the pseudo-second-order kinetic model and Langmuir isotherm model. Its phosphorus adsorption rate was significantly slower than that of n-LH, indicating a sustained-release effect.
- nano lanthanum hydroxide,
- sodium alginate,
- composite microspheres,
- phosphorus adsorption capacity,
- electrospray
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