化学工程2025，Vol.53Issue(2)：1-6,12,7.DOI:10.3969/j.issn.1005-9954.2025.02.001
聚多巴胺改性黄土的捕水特征及保水机制
Water uptake characteristics and retention mechanism of polydopamine modified loess
摘要
Abstract
Loess is widely distributed in China,and it has strong water sensitivity but poor water retention performance,which restricts the agricultural production in arid areas.To improve the water uptake and retention performance of loess,the PDA@LS modified loess with excellent water capture and retention properties was prepared by using a high-efficiency composite surface modification of PDA(polydopamine).The microscopic characteristics,functional group distribution,thermal mass loss characteristics,water uptake and retention properties of modified loess were studied.The kinetics of the water loss process was analyzed to explore the water capture and retention mechanisms of modified loess.The results show that the modified loess exhibits low viscosity and good fluidity when the mass ratio of dopamine hydrochloride to loess is 1:10.The saturated water absorption of modified loess increases from 0.275 7 g/g to 0.474 2 g/g,and its water retention property is improved by 27.96％compared to that of loess in an open environment.In addition,the modified loess is reusable in the cycles of water uptake and loss.Kinetic analysis indicates that the dehydration process of PDA@LS modified loess at a constant temperature follows logarithmic model.The modified loess is more prone to retain water,and its effective water diffusion coefficient is reduced by 56.02％compared to that of loess,but it is easily affected by temperature.This study significantly improves water uptake and retention performance of loess through PDA modification,effectively transforms loess into"black soil",and provides an important reference for improving soil water retention and water use efficiency in arid areas.关键词
聚多巴胺/改性黄土/保水性能Key words
polydopamine/modified loess/water retention capacity分类
农业科技引用本文复制引用
魏福龙,白波,王鹏乾..聚多巴胺改性黄土的捕水特征及保水机制[J].化学工程,2025,53(2):1-6,12,7.基金项目
陕西省自然科学基础研究计划(2023-JC-QN-0535) （2023-JC-QN-0535）
陕西省教育厅服务地方专项计划(23JE008) （23JE008）
