جستجوی مقالات مرتبط با کلیدواژه "بنتونیت" در نشریات گروه "جنگلداری"

Dust is occurred when a vehicle passes from the dry surface of unpaved roads. Dust particles can affects negatively on plant growth, water quality and road life. In this study the effects of some environmental friendly anti-dust agents including different dosage of sugarcane molasses, polyacrylamide and bentonite were investigated on road dust control. Research was done in 3, 9, 27 and 81-dat time frame.

Rear-mounted solution spray system equipped with 8 nozzles was used for implementation of treatments in rate of 2-2.5 l m-2 in three sites in forests of Golestan provinces including Loveh, Kouhmian and Shastkalateh. Besides, dust sucker instrument was applied to collect dust particles. Data were collected when a vehicle is passed with speed of 40 km h-1. Moreover, soil samples were collected from the margin of forest roads to measure the changes in soil Na, K, Ca and Mg due to washing.

Results showed that dust of forest roads decrease with increasing the anti-dust agent concentration and increased with time. In Loveh forest roads, polyacrylamide with concentration of 6% and sugarcane molasses with concentration of 20% were the most appropriate treatments. Bentonite was unsuitable due to the high amount of fines in surfacing materials. In Kouhmian forest roads, polyacrylamide with concentration of 4% and sugarcane molasses with concentration of 20% and in Shastkalateh forest roads, polyacrylamide with concentration of 2% was the most appropriate treatments. Bentonite increased the Mg and pH and Molasses increased the K and decreased the pH of soil at margin of forest roads. In other cases, there wasn’t a significant effect from the treatments on chemical properties of soil at margin of road. In Kouhmian forest roads, polyacrylamide with concentration of 4% and sugarcane molasses with concentration of 20% and in Shastkalateh forest roads, polyacrylamide with concentration of 2% was the most appropriate treatments. Bentonite increased the Mg and pH and Molasses increased the K and decreased the pH of soil at margin of forest roads. In other cases, there wasn’t a significant effect from the treatments on chemical properties of soil at margin of road.

Base on findings, sugarcane molasses in roads with high fine particles was most efficient, but in roads with low fine particles polyacrylamide was most efficient. These additive materials hadn’t significant effects on adjacent soil chemicals due to their low amount.Base on findings, sugarcane molasses in roads with high fine particles was most efficient, but in roads with low fine particles polyacrylamide was most efficient. These additive materials hadn’t significant effects on adjacent soil chemicals due to their low amount.

This study was conducted to enhance the antimicrobial properties and water absorption of sanitary papers. For this purpose, Montmorillonite nano clay with Bentonite brand (Has a layered structure in which its thickness is Nano metric), was processed with homogenizer to achieve a stable colloidal system with nanometer dimensions of particle size. Then, different weight levels of raw and homogenized nano clay were used to manufacture the paper and its effect on the antibacterial properties (Against both Escherichia coli and Bacillus subtilis) and water absorption were evaluated. Results showed that homogenized nano clay improved the antibacterial properties of paper due to much more adsorption and its specific surface. On the other hand, the effect of this substance on the growth reduction of Bacillus bacteria was more than Escherichia coli bacteria. Also, water absorption of papers increased with the addition of nano clay and homogenized nano clay. Also the effect of homogenized nano clay on this parameter was greater.

In this research، the effect of pH onthe performance of nanobentonite -chitosan system (as dry strength additives) in hardwood chemi-mechanicalpulp (CMP) was studied. For this purpose، 3 levels of pH (5. 5، 7، 8. 5) and 3 levels of chitosan (0. 75، 1. 25 and 2% - based on oven dried pulp) in constant level of 0. 3 nanobentonite (based on oven dried pulp) were applied. The Atomic Force Microscopy (AFM) imageconfirmed the nano structure of bentonite in thickness dimension at the range of 1-22. 3 nm. The results indicated that nano bentonite – chitosan in all levels of pH caused numerical improvement in tensile،burst and tear indicesand also apparent density in comparison with control sample. Although theeffect of studiedvariables (chitosan dosages and pH levels) on considered properties was statistically significant،but most of treatments were in the same groups according to Duncan grouping. In this research، treatment consisting of 1. 25 chitosan in fixed level of 0. 3 nano bentonite at alkaline pH showed the best results in mentioned properties and statistically had significant difference comparing other treatments. Therefore،it wasintroduced as theselected treatment in this research. It seems that the ratioof chitosanandbentonite nano anion had a great effect on performance ofnanoparticle system. Also the results showed that the performance of system depend on the pH of furnish and the best results was achievedin alkaline condition (pH=8. 5).