A novel mixed matrix nanofiltration membrane was constructed by coating a casting solution containing polyvinylidene fluoride(PVDF),polyethylene glycol(PEG)as hydrophilic agent,zeolitic like framework-67(ZIF-67),ethyl...A novel mixed matrix nanofiltration membrane was constructed by coating a casting solution containing polyvinylidene fluoride(PVDF),polyethylene glycol(PEG)as hydrophilic agent,zeolitic like framework-67(ZIF-67),ethylenediamine as cross-linking agent on Ag-nanoparticle-decorated polyester textile(PT)support(PT/AgNPs/PVDF-PEG/ZIF-67).PT/Ag-NPs/PVDF-PEG/ZIF-67 morphology,crystalline structure,surface chemical composition and hydrophilicity of PT/Ag-NPs/PVDF-PEG/ZIF-67 were fully characterized by field emission scanning electron microscopy(FE-SEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR)and water contact angle technique,respectively.PT/Ag-NPs/PVDF-PEG/ZIF-67 was applied in cross module set-up for removal of contaminated water containing rose bengal(RB)dye.The effect of operational parameters such as dye concentration,solution pH and flow rate on performance of PT/Ag-NPs/PVDF-PEG/ZIF-67 were investigated and optimized by central composite design(CCD).Casting solution containing 0.5 wt.%ZIF-67 as optimum value showed the good wettability,high pure water flux(PWF;35.8 L·m-2·h-1),flux recovery ratio(FRR;90%),dye removal efficiency(96.41%).The selectivity factor of 12.72 and 14.42 was found to be for RB in the presence of amido black and methylene blue as interferent dyes,respectively,which showed a good selective recognition ability for RB dye.展开更多
This research work viewed issues relating to post-consumers’ solid textile waste management among households from a sociological perspective. The study was carried out in Oyo state of Nigeria. It specifically identif...This research work viewed issues relating to post-consumers’ solid textile waste management among households from a sociological perspective. The study was carried out in Oyo state of Nigeria. It specifically identified sources of post-consumer solid textiles waste, assessed waste management practices in the study area and, examined knowledge of respondent’s on impact of post-consumers solid textile waste on the environment. Eight Local Government Areas were randomly selected from the state and, multistage random sampling procedure was applied in selecting 880 households for the study. Solid wastes generated by each of this household were collected twice a week. Sensitive and micro-census calibrated scale machine and weighing balance was employed in taking weight of the sorted textile wastes. Calibrated cylinder of radius 10 cm and height 40 cm was used in taking volume of the shredded waste. Mean value of post-consumer solid textile waste generated by individual was 0.11 kg ± 0.08, of volume 354 cm3 per day. Major identified waste disposal systems practiced by the respondents were open land surface dumping and open air burning. The respondents (100%) strongly agreed that, wastes are often discards indiscriminately in the street by individuals. Level of awareness on danger created by poor waste disposal system among 78% of the respondents was low. None of the respondents have training on waste management neither is there any accessible training center in the studied area. Part of procedures to solve environmental problems can be by raising levels of awareness of individual household’s, markets and institutional sectors on danger posed by poor handling of textile wastes to life and the environment, and be trained on waste management techniques. A functional and practically ideal waste management scheme should be established by the various organs of government mostly at the Local Government Area levels, and some investors could also be encouraged in instituting such schemes. Research institutes in the country should develop appropriate technologies and trainings on waste management. Apart from salvaging the environment, such schemes will also provide job to cushion poverty mitigation in Nigeria.展开更多
The employment of sustainable chemicals, such as citric acid, represents a possibility for the development of textile dyeing processes. This study aimed to analyze the possibility of replacement of acetic acid (common...The employment of sustainable chemicals, such as citric acid, represents a possibility for the development of textile dyeing processes. This study aimed to analyze the possibility of replacement of acetic acid (commonly used in textile processing) by citric acid in polyester and polyamide 6 dyeing processes. The utilization of citric acid as leveling agent for disperse dyestuffs was also investigated. Dyeing processes in turquoise color for these fabrics were performed employing citric and acetic acid. Color differences between dyeing processes and color fastness to water were evaluated. All the color dyeing differences were not significant and there was no transference in color fastness tests (grade 5). Otherwise, the differences among polyamide dyeing processes could be related to the efficiency of citric acid solution as sequestering agent. Notwithstanding citric acid to be more expensive than acetic acid and the need of previous dissolution by stirring, it could be advantageous for some formulations.展开更多
文摘A novel mixed matrix nanofiltration membrane was constructed by coating a casting solution containing polyvinylidene fluoride(PVDF),polyethylene glycol(PEG)as hydrophilic agent,zeolitic like framework-67(ZIF-67),ethylenediamine as cross-linking agent on Ag-nanoparticle-decorated polyester textile(PT)support(PT/AgNPs/PVDF-PEG/ZIF-67).PT/Ag-NPs/PVDF-PEG/ZIF-67 morphology,crystalline structure,surface chemical composition and hydrophilicity of PT/Ag-NPs/PVDF-PEG/ZIF-67 were fully characterized by field emission scanning electron microscopy(FE-SEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR)and water contact angle technique,respectively.PT/Ag-NPs/PVDF-PEG/ZIF-67 was applied in cross module set-up for removal of contaminated water containing rose bengal(RB)dye.The effect of operational parameters such as dye concentration,solution pH and flow rate on performance of PT/Ag-NPs/PVDF-PEG/ZIF-67 were investigated and optimized by central composite design(CCD).Casting solution containing 0.5 wt.%ZIF-67 as optimum value showed the good wettability,high pure water flux(PWF;35.8 L·m-2·h-1),flux recovery ratio(FRR;90%),dye removal efficiency(96.41%).The selectivity factor of 12.72 and 14.42 was found to be for RB in the presence of amido black and methylene blue as interferent dyes,respectively,which showed a good selective recognition ability for RB dye.
文摘This research work viewed issues relating to post-consumers’ solid textile waste management among households from a sociological perspective. The study was carried out in Oyo state of Nigeria. It specifically identified sources of post-consumer solid textiles waste, assessed waste management practices in the study area and, examined knowledge of respondent’s on impact of post-consumers solid textile waste on the environment. Eight Local Government Areas were randomly selected from the state and, multistage random sampling procedure was applied in selecting 880 households for the study. Solid wastes generated by each of this household were collected twice a week. Sensitive and micro-census calibrated scale machine and weighing balance was employed in taking weight of the sorted textile wastes. Calibrated cylinder of radius 10 cm and height 40 cm was used in taking volume of the shredded waste. Mean value of post-consumer solid textile waste generated by individual was 0.11 kg ± 0.08, of volume 354 cm3 per day. Major identified waste disposal systems practiced by the respondents were open land surface dumping and open air burning. The respondents (100%) strongly agreed that, wastes are often discards indiscriminately in the street by individuals. Level of awareness on danger created by poor waste disposal system among 78% of the respondents was low. None of the respondents have training on waste management neither is there any accessible training center in the studied area. Part of procedures to solve environmental problems can be by raising levels of awareness of individual household’s, markets and institutional sectors on danger posed by poor handling of textile wastes to life and the environment, and be trained on waste management techniques. A functional and practically ideal waste management scheme should be established by the various organs of government mostly at the Local Government Area levels, and some investors could also be encouraged in instituting such schemes. Research institutes in the country should develop appropriate technologies and trainings on waste management. Apart from salvaging the environment, such schemes will also provide job to cushion poverty mitigation in Nigeria.
文摘The employment of sustainable chemicals, such as citric acid, represents a possibility for the development of textile dyeing processes. This study aimed to analyze the possibility of replacement of acetic acid (commonly used in textile processing) by citric acid in polyester and polyamide 6 dyeing processes. The utilization of citric acid as leveling agent for disperse dyestuffs was also investigated. Dyeing processes in turquoise color for these fabrics were performed employing citric and acetic acid. Color differences between dyeing processes and color fastness to water were evaluated. All the color dyeing differences were not significant and there was no transference in color fastness tests (grade 5). Otherwise, the differences among polyamide dyeing processes could be related to the efficiency of citric acid solution as sequestering agent. Notwithstanding citric acid to be more expensive than acetic acid and the need of previous dissolution by stirring, it could be advantageous for some formulations.
