In this study, six combinations of flax, hemp, and glass fiber were investigated for a hybrid reinforcement system in a polyurethane (PU) composite. The natural fibers were combined with glass fibers in a PU composite in order to achieve a better mechanical reinforcement in the composite material. The effect of fiber hybridization in PU composites was evaluated through physical and mechanical p...

In this study a largely available lignocellulose feedstock hemp (Cannabis sativa), obtained as an industrial waste, was used for cellulose extraction. The extraction of cellulose microfibres from hemp biomass was conducted by alkaline treatment and an acidification process. The extracted cellulose microfibres were characterised using Fourier-transformed infrared spectroscopy (FTIR), Scanning el...

The chemical composition of lignin and lipids of bast fibers from industrial hemp (Cannabis sativa) used for high-quality paper pulp production was studied. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) of fibers showed a lignin with a p-hydroxyphenyl:guaiacyl:syringyl unit (H:G:S) molar proportion of 13:53:34 (S/G ratio of 0.64). p-Hydroxycinnamic acids, namely, p-coumaric and feru...

Results of a systematic study on the Ag, Cd and Pb ions sorption characteristics and kinetic properties of an unconventional material produced by introducing sulphydryl functional groups into natural hemp fibers are presented and discussed. The equilibrium data are analyzed using the Langmuir and Freundlich isotherm models. The monolayer sorption capacity of modified hemp is 10.75, 14.05 and 23...

This study describes the standardization of an efficient in vitro propagation and hardening procedure for obtaining plantlets from shoot tips of Hemp (Cannabis sativa L.). Hemp seedlings were germinated on half-strength 1/2 MS medium supplemented with 10 g·Lsucrose, 5.5 g·Lagar at a pH of 6.8 under light for 16 h per day. MS medium containing 0.2 mg·LTDZ, 0.1 mg·LNAA supported the maximal auxil...

The aim of this preliminary study was to assess exposure to various constituents of the organic dust generated during the processing of hemp in a small group of exposed workers. Airborne levels of inhalable dust, endotoxin and soluble protein, and the respirable, thoracic and inhalable fractions of fungal, bacterial and actinomycete contamination were measured in the personal breathing zone of ...

We examined concentrations of barium (Ba), cadmium (Cd}, copper (Cu), iron (Fe}, lead (Pb), and zinc (Zn) in buckwheat (Fagopyrum esculentum}, com (Zea mays}, giant ragweed (Ambrosia trifida), Pennsylvania smartweed (Polygonum pennsylvanicum }, and water hemp (Amaranthus rudis) seeds collected at the "3-Is" waterfowl impoundment at DePue Wildlife Management Area (DWMA}, DePue, Illinois, in the ...

This research is concerned with the mechanical and physical properties of hemp fibre reinforced concrete (HFRC). An experimental program was developed based on the statistical method of fractional factors design. The variables for the experimental study were: 1) mixing method; 2) fibre content by weight; 3) aggregate size; and 4) fibre length. Their effects on the compressive and flexural perfo...

Cr (III) removal from aqueous solutions by sorption in a fixed bed column filled with alizarin S impregnated hemp fibers has been studied. The effect of the initial metal ion concentration on the Cr (III) sorption process was investigated and the experimental breakthrough curves were obtained. The breakthrough time and saturation time decreased from 110 min to 80 min and from 300 min to 160 min...

Airborne pollen allergies and asthma are on a rise in the metropolitan city of Islamabad. Knowledge of allergenic pollen is limited in the area. Cannabis sativa L. or commonly known as Hemp is widely spread weed in the city. Morphological studies performed via light microscopy and SEM have shown that the pollen of Cannabis sativa are 21μm long having triporate aperture, spheroidal in shape and ...