EAME改性纤维素膜包覆炭基肥缓释机理研究

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中图分类号：S216 文献标志码：A 文章编号：1001-411X（2026）01-0030-12

Abstract： 【Objective】 To investigate the impact modified cellulose membrane on the nutrient release properties biochar-based fertilizers，and provide a theoretical foundation forconstructing rational coated slowrelease fertilizers. 【Method】 ECBIUF （Trans-9，10-epoxyoctadecanoic acid methyl ester cellulose membrane coated biochar-based infiltrated urea fertilizer） was prepared using microcrystalline celulose as a precursor and trans-9，10-epoxyoctadecanoic acid methyl ester （EAME） under varying concentrations and temperatures to fabricate modified cellulose membrane. Leaching experiments were conducted to obtain urea release prile curves.The coating layers before and after release were characterized via contact angle measurements，Fourier transform infrared spectroscopy，X-raydifraction，and scanning electronmicroscope，to establishtherelease kinetic model. 【Result】 Compared to unmodified biochar-based infiltrated urea fertilizer （BIUF），the EAMEmodified celulose membrane effectively delayed urea release.The cumulative nutrient leaching rate after the first two leaching cycles decreased from 53.29% （BIUF） to 22.62% ， marking a 58% reduction. The total leaching cycles required for full nutrient release increased from 12 to 24，achieving a 100% extension.Enhanced slow-release performance was observed with higher EAME modification concentrations，reducing the initial two-cycle leaching rate from 42.42% to 22.62% . Conversely， elevated modification temperatures slightly weakened this effect， increasing the leaching rate from 22.62% to 24.31% . Kinetic analysis identified three distinct nutrient release phases： Rapid release surface-crystalized urea， decelerated release urea physically adsorbedinbiocharpores，andprolongedslow-releaseureachemicallyboundtobiochar. 【Conclusion】EAMEmodified cellulose membranes enhance the slow-release performance biochar-based fertilizers through molecular interactions （e.g.， hydrogen bonding via hydroxyl groups） and hydrophobic effects from long hydrocarbon chains.This dual mechanism improves fertilizer utilization efficiency and fers anovel approach for developing coated slow-release fertilizers.

Key words：Modified celulose membrane; Coated carbon-based fertilizer; Sustained release performance; Kinetic analysis; Sustained release mechanism

随着全球人口持续增长，粮食需求也大幅增长，促使农业生产面临更高的挑战，以满足人口对作物生产和粮食供应的需求[1]。（剩余18393字）