Environment-friendly Superabsorbent: Development, Property and Application

doi:10.11924/j.issn.1000-6850.casb2021-0301

Abstract

Abstract:

To promote the environmental safety and reasonable application of superabsorbent in agriculture, cellulosic superabsorbent is prepared by irradiation from a ⁶⁰Coγ source. The optimal reaction condition in the synthetic process was explored, and the water absorption properties of the superabsorbent under different cations and urea concentrations, and the biodegradation and water retention property of the superabsorbent in soil were further analyzed. Moreover, the chemical structures of the superabsorbent were investigated by FTIR and SEM. The results showed that the optimal reaction condition was: superabsorbent composite containing 20% CMCNa and 0.2% crosslinker at absorbed dose of 8.47 kGy. The water absorption rate of the superabsorbent in deionized water was 367 g/g and the biodegradation rate was 6.41% after 15 days. The concentration of urea had little effect on the water retention property of the superabsorbent and the cations could significantly reduce the water absorption rate, and the inhibitory effect of cations on the absorption efficiency was ranked as: Fe³⁺> Mg²⁺> Na⁺. The superabsorbent could effectively reduce soil water loss and improve soil water content, therefore is suitable to mix with urea or added into the coating material for urea. The superabsorbent has good biodegradation and water retention property, and a certain application prospect in agriculture.

Key words: superabsorbent, ⁶⁰Co γ-ray irradiation, biodegradation, water loss, urea

CLC Number:

S157.9

LIU Ying, GENG Dandan, HAN Yongsheng, WEI Min, LIU Liu. Environment-friendly Superabsorbent: Development, Property and Application[J]. Chinese Agricultural Science Bulletin, 2022, 38(7): 86-90.

Figures/Tables 9

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