Tobacco Waste Biomass for Electrochemical Energy Storage Application

A large amount of industrial and agricultural wastes are generated in the tobacco industry, such as tobacco steams, tobacco stalks, and tobacco leaves. How to increase the economic added value of industrial and agricultural wastes is an important issue. It is a promising value-added way that these biological wastes are recycled into carbon materials with excellent electrochemical properties. Herein, biochar were prepared from tobacco waste biomass (mainly tobacco stems, tobacco stalks and tobacco leaves) through one-step carbonization. The as-obtained biochar exhibited high specific capacitance of 305.92 F·g−1 (tobacco stems), 328.07 F·g−1 (tobacco stalks), and 272.48 F·g−1 (tobacco leaves) at 1 A·g−1, when tested in a three-electrode system with 6 M KOH electrolyte. This study highlights the possibility of reusing tobacco waste to produce low-cost, green and high-performance carbon-based electrode materials for sustainable electrochemical energy storage systems.

Uji Formulasi dan Uji Efektivitas Repelan Lotion Ekstrak Daun Tembakau (nicotiana tabacum. L) Terhadap Nyamuk Aedes Aegypti

Tobacco leaves (Nicotiana tabaccum. L) have great potential as a pesticide or insect repellent, especially the Aedes aegypti mosquito. Maceration method was used to obtain tobacco leaf extract as much as 127.86 grams from the dried simplicia of tobacco leaves (Nicotiana tabaccum. L) 827 grams (yield 15.46%). The tobacco extract was made in the form of lotio with a concentration of 1%, 2%, and 3%, having repellant effectiveness of 90%, 96% and 100%, respectively. Physical stability test was carried out on the lotion 0%, 1%, 2%, and 3% as follows; organoleptic test (brownish color, typical tobacco aroma and homogeneity), spreadability test (6.1cm; 6.1cm; 6.2cm; 6.4cm), adhesion test (3.06sec; 2.8sec; 2.75sec; 2.61sec), cycling test (brownish color, thick consistency, homogeneity, and distinctive aroma of tobacco), pH test (7; 7; 7; 6,3), and viscosity test (4.708cPs, 4.575cPs, 4.465cPs, 4.403cPs). The results of One Way ANOVA analysis showed that there was a significant difference in each concentration of tobacco leaf extract lotio and Tukey's test showed that the repellant ability of 3% concentration had 100% percent repelance. It can be concluded that the ethanol extract lotion of tobacco leaves (Nicotiana tabaccum. L) has repellant effectiveness.Keywords: tobacco leaves, extract, lotion, repellant, ANOVA AbstrakDaun tembakau (Nicotiana tabaccum. L) memiliki potensi besar sebagai pestisida atau pengusir serangga khususnya nyamuk Aedes aegypti. Metode maserasi digunakan untuk mendapatkan ekstrak daun tembakau sebanyak 127,86 gram dari simplisia kering daun tembakau (Nicotiana tabaccum. L) 827 gram (rendemen 15,46%). Ekstrak tembakau dibuat dalam bentuk lotio dengan konsentrasi 1%, 2%, dan 3% memiliki efektivitas repelan berturut-turut adalah 90%, 96% dan 100%. Dilakukan uji stabilitas fisik terhadap lotio 0%,1%, 2%, dan 3% sebagai berikut; uji organoleptis (warna kecoklatan, aroma khas tembakau dan homogen), uji daya sebar (6,1cm; 6,1cm; 6,2cm; 6,4cm), uji daya lekat (3,06detik; 2,8detik; 2,75detik; 2,61detik), uji cycling test (warna kecoklatan, konsistensi kental, homogen, dan aroma khas tembakau), uji pH (7;7;7;6,3), dan uji viskositas (4.708cPs, 4.575cPs, 4.465cPs, 4.403cPs). Hasil analisis One Way ANOVA menunjukkan adanya perbedaan yang signifikan pada setiap konsentrasi lotio ekstrak daun tembakau dan uji Tukey menunjukkan kemampuan repelan konsentrasi 3% memiliki persen repelansi 100%. Hal ini dapat disimpulkan bahwa lotio ekstrak etanol daun tembakau (Nicotiana tabaccum. L) memiliki efektivitas repelan.Kata kunci: : daun tembakau; ekstrak; lotion; repelan; ANOVA

Qualitative Discrimination of Intact Tobacco Leaves Based on Near-Infrared Technology

To explore the application of near-infrared (NIR) technology to the quality analysis of raw intact tobacco leaves, a nondestructive discrimination method based on NIR spectroscopy is proposed. A “multiregion + multipoint” NIR spectrum acquisition method is developed, allowing 18 NIR diffuse reflectance spectra to be collected from an intact tobacco leaf. The spectral characteristics and spectral preprocessing methods of intact tobacco leaves are analyzed, and then different spectra (independent or average spectra) and different algorithms (discriminant partial least-squares (DPLS) and Fisher’s discriminant algorithms) are used to construct discriminant models for verifying the feasibility of intact leaf modeling and determining the optimal model conditions. Qualitative discrimination models based on the position, green-variegated (GV), and the grade of intact tobacco leaves are then constructed using the NIR spectra. In the application and verification stage, a multiclassification voting mechanism is used to fuse the results of multiple spectra from a single tobacco leaf to obtain the final discrimination result for that leaf. The results show that the position-GV discrimination model constructed using independent spectra and the DPLS algorithm and the grade discrimination model constructed using independent spectra and Fisher’s algorithm achieve optimal results with intact leaf NIR wavenumbers from 5006–8988 cm−1 and the first-derivative and standard normal variate transformation preprocessing method. Finally, when applied to new tobacco leaves, the position-GV model and the grade model achieve discrimination accuracies of 95.18% and 92.77%, respectively. This demonstrates that the two models have satisfactory qualitative discrimination ability for intact tobacco leaves. This study has established a feasible method for the nondestructive qualitative discrimination of the position, GV, and grade of intact tobacco leaves based on NIR technology.

Chemical Feedstock Recovery via the Pyrolysis of Electronically Heated Tobacco Wastes

The pyrolysis of waste electronically heated tobacco (EHT), consisting of tobacco leaves (TL), a poly-lactic acid (PLA) filter, and a cellulose acetate (CA) filter, was investigated using thermogravimetric (TG) and pyrolyzer–gas chromatography/mass spectrometry (Py-GC/MS) analysis. The pyrolytic properties of waste EHT obtained after smoking were comparable to those of fresh EHT. Although the maximum decomposition temperatures (TmaxS) of waste TL and CA were similar to those of fresh EHT components, the Tmax of waste PLA was slightly higher than that of fresh PLA due to smoldering. The Tmaxs of PLA and CA were lowered when they were co-pyrolyzed with TL due to interactions between pyrolysis intermediates. The apparent activation energies for the non-isothermal pyrolysis of waste EHT components were higher than those of fresh EHT components. Py-GC/MS analysis results indicated that considerable amounts of chemical feedstocks, such as nicotine and limonene from TL, caprolactone and lactide from PLA, and acetic acid and triacetin from CA, can be recovered by simple pyrolysis of EHT. Co-pyrolysis of TL, PLA, and CA revealed that the experimental amount of lactide was much larger than the calculated value, suggesting its synergistic formation.