WOOD RESEARCH Volume 61, Number 2, 2016
Xiurong Guo, Danfeng Du, Zhanfeng Qi, Peng Wang, and Hoseok Song

Microstructure characterization of wood fiber pit adsorbing ultrafine particles emitted by diesel engine and simulation of its influence factors

Wood fiber is a porous biomass material, which has a strong adsorption ability for the PM (particulate matter) emitted by diesel engines. Through the SEM experiments, the fact that the pits of micron wood fiber after heat-treated can adsorb lots of ultrafine particles (aerodynamic diameter is less than 1μm) is shown clearly. In simulation, the particle concentration equations and fibrous filtration theory are applied. The collection media around pits is assumed as a cylinder. The simulation results show that the pits have relatively lower collection efficiency for the particles within the diameter from 0.4 to 0.6 μm. Out of the range of 0.4 to 0.6 μm, the collection efficiency increases rapidly, which implies that the pits have higher collection efficiency to filter the particles with the diameter out of 0.4 to 0.6 μm. Among all the affecting factors on collection efficiency, the reduction of permeate flow rate and the addition of tracheid wall thickness improve the collection efficiency. However, exhaust temperature has negligible influence on the collection efficiency.

WOOD RESEARCH Volume 62, Number 2, 2017
Hong Yun, Kaifu Li, Chuangshuang Hu, and Dengyun Tu

Adsorption and fixation of soluble fire retardancy in Populus russkii and Cunninghamia lanceolata

Flame retardant treatment is a common method of wood preservation. However, the factory usually uses the same approach to all the wood, but lack of targeted so as to cause waste. This study used poplar and Chinese fir as the species investigated. These species were dipped with boron-nitrogen-phosphorus (B-P) fire retardant. The influences on material loading of processing method, concentration of fire retardant, and drying method were investigated. The contents of B and P were tested by inductively coupled plasma optical emission spectrometry (ICP-OES), after distilled water washing and ultrasonic washing. The results showed that the volume loading increased with the concentration of fire retardant. Freeze-drying can noticeably improve the volume loading, and the impact of the drying method was more notable on poplar than on Chinese fir. The fixation effect of the B and P in poplar was lower by ultrasonic washing than that was by distilled water washing. The fixation effect was opposite in the Chinese fir. Vacuum process was more suitable for the poplar (hardwood), and vacuum-pressure process was
more suitable for the Chinese fir (soft wood).

WOOD RESEARCH Volume 62, Number 2, 2017
Beata Doczekalska, Agata Pawlicka, Krzysztof Kuśmierek, Andrzej Świątkowski, and Monika Bartkowiak

Adsorption of 4-chlorophenol from aqueous solution on activated carbons derived from hornbeam wood

The adsorption of 4-chlorophenol (4-CP) from aqueous solution on activated carbons prepared from hornbeam wood was studied. The adsorption kinetic data were analyzed using pseudo-first order and pseudo-second order models. The adsorption kinetics of 4-CP was better represented by the pseudo-second order equation. The equilibrium adsorption data were described by Langmuir and Freundlich isotherms and the results showed that both models fitted well the 4-CP adsorption; nevertheless, a slightly higher R2 values were observed for the Langmuir model. The effects of solution pH and ionic strength on the adsorption were so investigated. The high 4-CP adsorption capacity (2.71–4.37 mmol.g-1) shows that hornbeam wood is a good precursor for the preparation of activated carbons for the adsorptive removal of organic contaminants.

WOOD RESEARCH Volume 63, Number 6, 2018
Oswaldo Moreno-Anguiano, José G. Rutiaga-Quiñones, Francisco Márquez-Montesino, José Luis Rico-Cerda, and Artemio Carrillo-Parra

Performance of activated carbon obtained from pine wood and determination of its adsorption capacities of ammonia and gasoline vapors

Two types of pine wood were used to produce activated carbon (AC) by chemical activation with phosphoric acid. The yield of the activated carbon (CAs) obtained by considering the following factors in the process: species, activation temperature and impregnation ratio (R = wood mass/dissolution mass), the variables of such factors being the species Pinus pseudostrobus (Pp) and Pinus leiophylla (Pl), temperature values 400 and 500°C, and values of R (1:1, 1:2, 1:3), respectively, thus having 12 combinations. The results indicate that the best performance was in the treatment with Pp 400°C and with R = 1:1. A surface area of 790 and 801 m2.g-1 and a total pore volume of 0.312 and 0.316 cm3.g-1 were obtained for the Pp 500-2 and Pl 500-2 carbons, respectively. Likewise, the adsorption capacity of ammonia and gasoline vapors of the carbon obtained was determined.