Hidrotermal hidroliz yönteminde amonyum klorür kullanımının lif levhaların geri dönüşümüne etkisi

Abstract

Lif levhalar, kullanım ömürlerinin sonunda bertaraf edilmelerinde hava kirliliği gibi bazı önemli çevresel sorunlara neden olmaktadır. Bu sorunların çözümünde lif levhaların geri dönüşümü en etkili yöntem olmakla beraber, henüz kendine yaygın bir uygulama alanı bulamamıştır. Literatürde odun esaslı levhalar için çeşitli geri dönüşüm metotları bulunmakla olup, bunlar arasında en çok araştırılanlardan biri de hidrotermal hidroliz yöntemidir. Bu çalışmada, hidrotermal hidroliz yöntemi ile geri dönüştürme işleminde farklı (%0, %2,5, %5, %7,5, %10, %15, %20 ve %25) konsantrasyonlara sahip amonyum klorür çözeltilerinin kullanımının elde edilen lifler üzerine etkisi araştırılmıştır. Geri kazanılan liflerin özelliklerinin tespiti amacıyla elementel analiz (%C, %H, %N), FT-IR analizi, SEM (taramalı elektron mikroskobu) ve SEM EDS (enerji dağılım spektrometresi) analizleri gerçekleştirilmiştir. Elde edilen sonuçlara göre, amonyum klorür miktarındaki artış lif levhanın yapısında bulunan toplam azot (N) oranını %4,198’den %0,268’e kadar azalttığı gözlemlenmiştir. Buna rağmen, amonyum klorür miktarındaki atış ile elde edilen liflerin morfolojilerinde bozulmalar olduğu gözlemlenmiştir. SEM EDS analizi sonuçlarında %20 ve %25 konsantrasyonda amonyum klorür çözeltisi ile muamele edilerek geri kazanılan liflerin yüzeyinde azot elementinin olmadığı ve tüm sonuçlar değerlendirildiğinde, bu iki çözelti optimum işlem konsantrasyonu olarak tespit edilmiştir.

Keywords

• Geri dönüşüm
• Lif levha
• Lif özellikleri
• Hidrotermal hidroliz

The effect of ammonium chloride usage on the recycling of fiberboards in the hydrothermal hydrolysis method

Abstract

Fiberboards, when disposed of at the end of their service life, cause some significant environmental issues such as air pollution. The recycling of fiberboards is the most effective solution to these problems; however, it has not yet found a widespread application. In the literature, there are various recycling methods for wood-based panels, but one of the most researched is the hydrothermal hydrolysis method. In this study, the effect of ammonium chloride solutions with different concentrations (0%, 2.5%, 5%, 7.5%, 10%, 15%, 20%, and 25%) on the fibers obtained through the recycling process using the hydrothermal hydrolysis method was investigated. Elemental analysis (C%, H%, N%), FT-IR analysis, SEM (scanning electron microscope) and SEM EDS (energy dispersive spectrometry) analyses were conducted to determine the properties of the recovered fibers. According to the obtained results, it has been observed that the increase in the amount of ammonium chloride significantly reduces the total nitrogen (N) content in the structure of the fiber board from 4.198% to 0.268%. Nevertheless, it has been observed that there are distortions in the morphologies of the fibers obtained with the increase in the amount of ammonium chloride. In the SEM EDS analysis results, it was found that there was no nitrogen element on the surface of the fibers recovered by treatment with ammonium chloride solution at concentrations of 20% and 25%, and when all results were evaluated, these two solutions were determined to be the optimum processing concentrations.

Keywords

• Recycling
• Fiberboard
• Fiber properties
• Hydrothermal hydrolysis

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