Borax crosslinked fenugreek galactomannan hydrogel as potential water-retaining agent in agriculture

Chuanjie Liu; Fuhou Lei; Pengfei Li; Jianxin Jiang; Kun Wang

doi:10.1016/j.carbpol.2020.116100

Borax crosslinked fenugreek galactomannan hydrogel as potential water-retaining agent in agriculture

Carbohydr Polym. 2020 May 15:236:116100. doi: 10.1016/j.carbpol.2020.116100. Epub 2020 Feb 29.

Authors

Chuanjie Liu¹, Fuhou Lei², Pengfei Li², Jianxin Jiang³, Kun Wang⁴

Affiliations

¹ MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing, 100083, PR China.
² GuangXi Key Laboratory of Chemistry and Engineering of Forest Products, College of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, PR China.
³ MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing, 100083, PR China. Electronic address: jiangjx2004@hotmail.com.
⁴ MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing, 100083, PR China. Electronic address: wangkun@bjfu.edu.cn.

PMID: 32172899
DOI: 10.1016/j.carbpol.2020.116100

Abstract

In order to explore a novel type of agricultural water-retaining agent, borax crosslinked fenugreek galactomannan-borax hydrogel (FGB) was synthesized. The hydrogel was characterized by thermogravimetric analysis, FT-IR, XRD, and SEM. The largest swelling index of FGB (115) was higher than that of guar gum hydrogel (70) at pH 9. The water absorption capacity of sandy soil was studied by mixing the hydrogel with soil, then FGB was evaluated as a latent water retention agent. Results showed that the swelling index of sandy soil increased from 16.28% to 35.53% with 0.5 wt.% hydrogel added. The water retention time increased from 2 to 11.5 days at 20 °C and 60 % humidity. Furthermore, more than ten cycles of water absorption and water loss of soil-FGB were carried out at 50 °C at a relatively stable water retention capacity. This low-cost, environmentally friendly hydrogel has great application potential in agriculture for soil water conservation.

Keywords: Agriculture; Fenugreek galactomannan; Hydrogel; Water absorption and water loss.