تهیه فیلم لیگنوسلولزی با انحلال پسماندهای کُلش برنج در محلول قلیایی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 فارغ التحصیل کارشناسی ارشد، گروه علوم و صنایع چوب و کاغذ، دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران

2 استاد، گروه علوم و صنایع چوب و کاغذ، دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران

3 دانشیار، گروه علوم و صنایع چوب و کاغذ، دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران

چکیده

با توجّه به کمبود منابع نفتی و اثرات زیست محیطی ناشی از فیلم­ های پوششی حاصل از مواد نفتی و پلاستیکی که معایب فراوانی از جمله زیست تخریب ­پذیر نبودن و آلایندگی دارند، .استفاده از زیست­ تود به ­عنوان یک مادة پایدار و تجدیدپذیر برای تولید انواع فیلم از منابع لیگنوسلولزی از جمله کاه گندم و کُلش برنج در سال­ های اخیر افزایش یافته است. در این پژوهش، تهیة فیلم لیگنوسلولزی بر پایه انحلال کُلش برنج مورد بررسی قرار گرفت. در ابتدا برای انحلال کُلش برنج از هیدروکسید سدیم با غلظت ­های متفاوت استفاده شد. تیمارهای مختلفی مانند انجماد-ذوب و پیش­تیمار اسیدی برای بهبود انحلال کُلش برنج استفاده شد. بر اساس محاسبه بازده انحلال، نتایج مطلوبی برای انحلال کُلش برنج در محلول هیدروکسید سدیم حاصل نشد، اما، با اعمال پیش­تیمار شیمیایی اسید، استفاده از محلول سود- اوره و توالی انجماد- ذوب، بازده انحلال بهبود یافت و فیلم­هایی با استفاده از روش قالب­ریزی تولید شدند. خواص ظاهری و شیمیایی فیلم ­های تهیه شده با روش ­های آنالیز از جمله شفافیت محلول به ­عنوان شاخصی از کیفیت انحلال، تصاویر میکروسکوپ نوری و میکروسکوپ الکترونی روبشی و آزمون EDXبررسی شد. نتایج نشان داد فیلم حاصل­شده از انحلال کُلش برنج پیش­تیمار اسیدی شده و سپس انحلال با محلول سود- اوره دارای خواص نوری، یکنواختی و توپوگرافی سطح مناسبی بوده که می­تواند برای پوشش­دهی در صنعت بسته­بندی مورد استفاده قرار گیرد.

کلیدواژه‌ها

عنوان مقاله [English]

Preparation of Lignocellulosic Film by Dissolving of Rice Straw in Alkaline Solution

نویسندگان [English]

  • Ziba Fathi 1
  • Yahya Hamzeh 2
  • Ali Abdolkhani 3
1 MSc. Graduated, Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran
2 Professor, Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, , Karaj, Iran
3 Associate Professor, Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, , Karaj, Iran
چکیده [English]

Due to the limited oil resources and environmental effects of coating films from petroleum and plastic materials, today there is special attention to the production, optimization and consumption of natural biopolymers. The use of biomass as a sustainable and renewable material for the production of films from lignocellulosic sources such as wheat straw and rice straw has increased in recent years. In this study, the preparation of a biofilm based on dissolution of rice straw was investigated. Initially, sodium hydroxide was used in different concentrations to dissolve rice straw. Various treatments such as freezing-thawing and acid pretreatment were used to improve the dissolution of rice straw. Based on the calculation of dissolution yield, good results were not obtained for dissolving rice straw in sodium hydroxide solution. However, by applying chemical acid pretreatment, soda/urea solution and freezing-thawing sequence, dissolution efficiency was improved and films were produced using the molding method. The physical and chemical properties of the prepared films were analyzed by analysis methods including the transparency of the solution as an indicator of the quality of dissolution, optical microscope and scanning electron microscopy and EDX test. The results showed that the resulting film was dissolved in acid pretreated rice straw and then dissolved in soda/urea solution with optical properties, uniformity and topography of a suitable surface that can be used as a coating in the packaging industry.

کلیدواژه‌ها [English]

  • Lignocellulosic film
  • Rice straw
  • Dissolution
  • Physical and chemical properties
  • Freezing-thawing

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سابقه مقاله

  • تاریخ دریافت: 01 مرداد 1399
  • تاریخ بازنگری: 31 مرداد 1399
  • تاریخ پذیرش: 01 آذر 1399

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