浒苔多糖/魔芋葡苷聚糖/生物质炭肥料地膜的制备

Preparation of Enteromorpha Polysaccharides/Konjac Glucosidan/Biochar Fertilizer Mulch Film

中文关键词:  浒苔多糖  魔芋葡甘聚糖  生物质炭  可降解地膜  营养功能

Key Words:Enteromorpha polysaccharide  Konjac glucomannan  biochar  degradable mulch film  nutritional function

中文摘要:

      本研究从浒苔中提取浒苔多糖，并以负载尿素生物质炭（U-BC，负载率达17.8%）、浒苔多糖和魔芋葡甘聚糖（KGM）为原料，制备具有营养功能的可生物降解浒苔多糖/KGM/生物质炭肥料地膜（UBCF），探讨了UBCF的化学结构、尿素释放性、机械性能、耐水性、透光性、热稳定性及可生物降解性等特性。结果表明，UBCF含有丰富的羟基、羧基和磺酸基等基团；在水中浸泡20 h后，尿素累计释放率为76.9%；此外，UBCF透光率<3%，满足不透明黑色地膜的透光性要求；在土埋80天后，UBCF降解率达68.3%，证明该肥料地膜具备优异的阻光性和可生物降解性，并具有良好的热稳定性。

Abstract:

      This study extracted Enteromorpha polysaccharide from Enteromorpha， and used urea-loaded biochar （U-BC， loading ratio of 17.8%）， Enteromorpha polysaccharide， and konjac glucomannan （KGM） as raw materials to prepare a biodegradable nutrient-functionalized Enteromorpha polysaccharide/KGM/biochar fertilizer mulch film （UBCF）. The chemical structure， urea-releasing property， mechanical properties， water resistance， light transmittance， thermal stability， and biodegradability of UBCF were systematically investigated. The results revealed that UBCF contained abundant functional groups including hydroxyl， carboxyl， and sulfonic acid groups. The cumulative release ratio of urea in UBCF was 76.9% after 20 h water immersion. Notably， UBCF exhibited light transmittance <3%， meeting the optical requirements for opaque black films. After 80 days of soil burial， the degradation rate of UBCF reached 68.3%， confirming its excellent light-blocking capability， biodegradability， and favorable thermal stability.