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首页> 外文期刊>Plasma Science & Technology >Investigation of biomass surface modification using non-thermal plasma treatment
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Investigation of biomass surface modification using non-thermal plasma treatment

机译：使用非热等离子体处理研究生物质表面改性

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The effects of non-thermal plasma (NTP) treatment on biomass in the form of pulverized palm-based empty fruit bunches (EFB) are investigated. Specifically, this study investigates the effects of NTP treatment on the surface reactivity, morphology, oxygen-to-carbon (O/C) ratio of the EFB at varying treatment times. The surface reactivity is determined by the reaction of antioxidant functional groups or reactive species with 2,2-diphenyl-1-picrylhydrazyl (DPPH). By measuring the concentration of the DPPH with a spectrophotometer, the change in the amount of antioxidant functional groups can be measured to determine the surface reactivity. The reactions of the various lignin components in the EFB with respect to the NTP treatment are discussed by qualitatively assessing the changes in the Fourier transform infrared (FTIR) spectra. The surface morphology is examined by a scanning electron microscope. To determine the amount of oxygen deposited on the EFB by the air-based NTP treatment, the oxygen and carbon contents are measured by an energy dispersive x-ray detector to determine the O/C ratio. The results show that the NTP reactor produced reactive species such as atomic oxygen and ozone, increasing the surface reactivity and chemical scavenging rate of the EFB. Consequently, the surface morphology changed, with an observed rougher surface from the images of the EFB samples. The change in the appearance of the surface is accompanied by a high O/C ratio, and is caused by reactions of certain components of lignin due to the NTP treatment. The lignin component that was modified is believed to be syringyl, as the syringyl portion in the lignin of EFBs is higher compared to the other components. Syringyl components are detected in the range of FTIR wavenumbers of 1109-1363 cm(-1). With increasing NTP treatment times, the absorbance (of the peaks in the FTIR spectra) for syringyl related C-H and lignin associated C=C bonds decreases as the syringyl decomposes. The resulting release of carboxyl compounds increases the absorbance for the carbonyl C=O group. The results show that NTP treatment is able to modify the surface properties of EFB, and that the surface reactivity can be increased to improve their conversion and processing efficiencies.
机译：研究了非热血浆（NTP）处理对粉碎的棕榈基空果束（EFB）形式的生物质的影响。具体地，本研究研究了NTP处理对EFB在不同处理时间的表面反应性，形态，氧 - 碳（O / C）比的影响。通过抗氧化官能团或反应性与2,2-二苯基-1-富铬（DPPH）的反应来确定表面反应性。通过测量用分光光度计测量DPPH的浓度，可以测量抗氧化官能团的量的变化以确定表面反应性。通过定性评估傅里叶变换红外（FTIR）光谱的变化来讨论各种木质素组分关于NTP处理的各种木质素组分的反应。通过扫描电子显微镜检查表面形态。为了通过基于空气的NTP处理确定沉积在EFB上的氧气的量，通过能量分散X射线检测器测量氧气和碳含量以确定O / C比。结果表明，NTP反应器产生了反应性物种，如原子氧和臭氧，增加了EFB的表面反应性和化学清除率。因此，从EFB样品的图像中观察到的粗糙表面改变了表面形态。表面外观的变化伴随着高O / C比，并且由于NTP处理而通过木质素的某些组分的反应引起的。被认为是修饰的木质素组分是铁蒽基，因为EFBs的木质素中的陶醉部分与其他组分相比较高。在1109-1363cm（-1）的FTIR波纹的范围内检测陶林组分。随着NTP治疗时间的增加，当陶醉的分解时，用于析晶基相关C-H和木质素相关的C = C键的吸光度（FTIR光谱中的峰）降低。所得羧基化合物的释放增加了羰基C = O基团的吸光度。结果表明，NTP处理能够改变EFB的表面性质，并且可以增加表面反应性以改善其转化和加工效率。

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