A new kind of hydrophobic crude oil sorbent was successfully developed by grafting kenaf shive with styrene monomer. In this paper, crude oil sorbents were developed through regeneration method by varying the initiato...A new kind of hydrophobic crude oil sorbent was successfully developed by grafting kenaf shive with styrene monomer. In this paper, crude oil sorbents were developed through regeneration method by varying the initiator concentration, monomer ratio and particle sizes in the range of 0.5 - 2.5 wt%, 0.5 - 2.0 wt % and 125 - 1000 μm respectively. This research approach for the development of crude oil sorbent from graft modified kenaf shive/core and the aforementioned variable optimization has not been reported. The effect studies of the individual and combine factors were carried out using a statistical experimental design matrix using five-level central composite design (CCD). Respond surface methodology (RSM) was used to optimise and develop equations of the aforementioned variables (initiator concentration, monomer ratio and particle sizes). The optimal swelling capacity of 616% and 267% lower retention were achieved at initiator concentration, monomer ratio and particle size of 12.5 wt%, 1.50 wt% and 562 μm respectively. TGA-DTA, XRD and BET analysis were carried out on optimised sample and, FTIR was carried on both unmodified (UG) and optimized sorbent. Further computations were done for grafting efficiency (GE), homopolymers and density. The findings display the effect of the three variables and navigation equations were generated for further investigations on them. However, the results show the feasibility and robustness of facile oil sorption.展开更多
In this paper, it presented the results of experimental study of utilization of MgO cement as calcium hydrate replacement in lightweight composites based on hemp shives. The results of selected characteristics （compr...In this paper, it presented the results of experimental study of utilization of MgO cement as calcium hydrate replacement in lightweight composites based on hemp shives. The results of selected characteristics （compressive strength and coefficient of thermal conductivity） of hardened composites show that MgO cement based on the milled caustic magnesite is suitable alternative in comparison to conventional binders used in hemp concrete. This material leads to new environmentally products as non-load bearing building materials.展开更多
Local agro-industrial wastes-based particleboards and fiberboards in Egypt are manufactured mainly from sugarcane-bagasse and flax shives.These panels are used in decorations and interior claddings.This paper aimed to...Local agro-industrial wastes-based particleboards and fiberboards in Egypt are manufactured mainly from sugarcane-bagasse and flax shives.These panels are used in decorations and interior claddings.This paper aimed to broaden their market to be utilized in local low-cost and simple building envelope retrofitting packages in-stead of conventional packages that depend on imported expanded polystyrene and wet-rendered gypsum boards.Thermal conductivities of various existing sugarcane-bagasse and flax-shives-based panels were measured to be used in developing multilayered interior claddings with adequate thermal insulating performance to increase the thermal mass of a validated non-insulated case-study residential building as recommended by the Egyptian Code for Energy Efficiency of Residential Buildings.Models retrofitted using the developed cladding assemblies were simulated using Design Builder to determine their achieved annual energy savings and predict their profitability.Thermal conductivities of sugarcane-bagasse and flax-shives-based particleboards were lower than wood-based cladding panels,with the range of 0.05-0.1166 W/mK.Moreover,the thermal conductivities of sugarcane-bagasse fiberboard had the range of 0.0926-01,111 W/mK which is significantly lower than wood-based fiberboards.Simulation results showed that both models retrofitted,sugarcane bagasse-based and flax shives-based,achieved better energy savings,5.07%and 5.04%,than the conventionally retrofitted model,3.73%.Furthermore,the flax-shives-based model showed higher profitability,with positive income achieved in the 15th year,than a con-ventionally retrofitted model,achieved in the 20th year,and the sugarcane-bagasse-based model,achieved in the 19th year.Thus,it was recommended that although flax-shives-based wall claddings were usually 14-20%thicker than sugarcane-bagasse-based claddings,they provided similarly high annual energy savings with lower initial costs and higher profitability.展开更多
文摘A new kind of hydrophobic crude oil sorbent was successfully developed by grafting kenaf shive with styrene monomer. In this paper, crude oil sorbents were developed through regeneration method by varying the initiator concentration, monomer ratio and particle sizes in the range of 0.5 - 2.5 wt%, 0.5 - 2.0 wt % and 125 - 1000 μm respectively. This research approach for the development of crude oil sorbent from graft modified kenaf shive/core and the aforementioned variable optimization has not been reported. The effect studies of the individual and combine factors were carried out using a statistical experimental design matrix using five-level central composite design (CCD). Respond surface methodology (RSM) was used to optimise and develop equations of the aforementioned variables (initiator concentration, monomer ratio and particle sizes). The optimal swelling capacity of 616% and 267% lower retention were achieved at initiator concentration, monomer ratio and particle size of 12.5 wt%, 1.50 wt% and 562 μm respectively. TGA-DTA, XRD and BET analysis were carried out on optimised sample and, FTIR was carried on both unmodified (UG) and optimized sorbent. Further computations were done for grafting efficiency (GE), homopolymers and density. The findings display the effect of the three variables and navigation equations were generated for further investigations on them. However, the results show the feasibility and robustness of facile oil sorption.
文摘In this paper, it presented the results of experimental study of utilization of MgO cement as calcium hydrate replacement in lightweight composites based on hemp shives. The results of selected characteristics （compressive strength and coefficient of thermal conductivity） of hardened composites show that MgO cement based on the milled caustic magnesite is suitable alternative in comparison to conventional binders used in hemp concrete. This material leads to new environmentally products as non-load bearing building materials.
文摘Local agro-industrial wastes-based particleboards and fiberboards in Egypt are manufactured mainly from sugarcane-bagasse and flax shives.These panels are used in decorations and interior claddings.This paper aimed to broaden their market to be utilized in local low-cost and simple building envelope retrofitting packages in-stead of conventional packages that depend on imported expanded polystyrene and wet-rendered gypsum boards.Thermal conductivities of various existing sugarcane-bagasse and flax-shives-based panels were measured to be used in developing multilayered interior claddings with adequate thermal insulating performance to increase the thermal mass of a validated non-insulated case-study residential building as recommended by the Egyptian Code for Energy Efficiency of Residential Buildings.Models retrofitted using the developed cladding assemblies were simulated using Design Builder to determine their achieved annual energy savings and predict their profitability.Thermal conductivities of sugarcane-bagasse and flax-shives-based particleboards were lower than wood-based cladding panels,with the range of 0.05-0.1166 W/mK.Moreover,the thermal conductivities of sugarcane-bagasse fiberboard had the range of 0.0926-01,111 W/mK which is significantly lower than wood-based fiberboards.Simulation results showed that both models retrofitted,sugarcane bagasse-based and flax shives-based,achieved better energy savings,5.07%and 5.04%,than the conventionally retrofitted model,3.73%.Furthermore,the flax-shives-based model showed higher profitability,with positive income achieved in the 15th year,than a con-ventionally retrofitted model,achieved in the 20th year,and the sugarcane-bagasse-based model,achieved in the 19th year.Thus,it was recommended that although flax-shives-based wall claddings were usually 14-20%thicker than sugarcane-bagasse-based claddings,they provided similarly high annual energy savings with lower initial costs and higher profitability.
