| Printing and dyeing wastewater has high chromaticity,large water volume,difficult to degrade,serious pollution,and high processing cost.Waste fiber materials are rich in sources,cheap,and biodegradable.In this study,waste fiber is used as the substrate,and cheap fiber-based solid materials with dual effects of high-adsorbent and catalytic performance for dyes are prepared.The adsorpent and catalytic material and hydrogen peroxide are used to form a heterogeneous Fenton catalytic system,which is applied to the decolorization of Reactive Turquoise Blue KNG simulated dye wastewater.The purpose is to effectively remove the dyes in the dye wastewater,and at the same time,the adsorpent and catalytic material can be used repeatedly to reduce the cost of decolorization,and effective use of waste.In this study,wool fibers and non-woven viscose are used as raw materials.The wool fibers and non-woven viscose are pretreated with alkali agents,sodium bisulfite,plasma and cationic gelatin protein additives,and then gelatin copper complexes are used.Copper sulfate and ferrous sulfate are used to modify wool fibers and non-woven viscose with metal salts to prepare fiber-based adsorpent and catalyst materials,which are applied to the decolorization of Reactive Turquoise Blue KNG simulated dye wastewater.Using the decolorization rate as an evaluation index,the optimal process conditions and metal salt modification treatment are optimized.The preparation process of the wool fiber-based adsorpent and catalytic material is:first put the wool fiber into an aqueous solution containing 2%(owf)cationic gelatin protein additives and 10%(owf)sodium carbonate,pretreat it at 95°C for 50 minutes,then take it out and wash it;After pretreatment,the wool fiber is put into an aqueous solution containing 30%(owf)gelatin copper complex and40%(owf)ferrous sulfate,modified at 35°C for 60 minutes,then taken out for washing and drying.The preparation process of the non-woven viscose-based adsorpent and catalytic material is as follows:first put the non-woven viscose into an aqueous solution containing4%(owf)cationic gelatin protein additives and 10%(owf)sodium hydroxide,and pretreat it at 35°C for 30 minutes,then take out the water for washing.And put the pretreated non-woven viscose into an aqueous solution containing 40%(owf)gelatin copper complex and 40%(owf)ferrous sulfate,modify it at 65°C for 40 minutes,then take it out for washing and dry.Next,the best decolorization process of these two adsorpent and catalytic materials is discussed.By exploring the effects of 30%hydrogen peroxide dosage,decolorizing solution p H value,hydrochloric acid dosage,decolorizing temperature,and decoloring time on the decolorization rate of the adsorpent and catalytic material.It is concluded that the best decolorization process for the wool fiber-based adsorpent and catalytic material is:1 m L·L-1hydrochloric acid and 4 m L·L-130%hydrogen peroxide are added to the simulated dye liquor wastewater containing 0.12 g·L-1Reactive Turquoise Blue KNG dye,put into the wool fiber-based adsorpent and catalytic material,and the ratio of fiber weight to solution volume is 1?100.Decolorization treatment at 35°C for 2 h.The best decolorization process for the non-woven viscose-based adsorpent and catalytic material is:adding 3 m L·L-1hydrochloric acid and 2 m L·L-130%hydrogen peroxide to the simulated dye liquor wastewater containing 0.12 g·L-1Reactive Turquoise Blue KNG dye,and putting it into non-woven viscose-based adsorpent and catalytic material,the ratio of fiber weight to solution volume is 1?100,decolorization treatment at 35?for 2 h.The influence of sodium chloride,potassium permanganate and ascorbic acid in the dye liquor on the decolorization effect is also discussed.The results show that the presence of sodium chloride in the dye liquor is not conducive to the decolorization of dye wastewater.The presence of trace amounts of potassium permanganate and ascorbic acid can improve the decolorization.effect.Secondly,the decolorization effects of these two adsorpent and catalytic materials are evaluated.The results show that these two adsorpent and catalytic materials can be applied to the decolorization of dye wastewater of acid dyes,direct dyes and reactive dyes.After decolorizing the reused water,it can also be used for fabric dyeing.In addition,the heterogeneous Fenton system composed of the adsorpent and catalytic material and hydrogen peroxide has the dual functions of adsorbing dye anions and catalyzing the degradation of the dye,and the adsorpent and catalytic material can be used repeatedly.Moreover,other fiber-based waste materials are prepared according to this process can also obtain good decolorization effects and repeated reuse effects.Finally,the structure and performance of these two adsorpent and catalytic materials are characterized,and the mechanism of action of these two adsorpent and catalytic materials is discussed.The results show that the adsorpent and catalytic material can effectively complex with the gelatin copper complex and ferrous sulfate,and it is not easy to dissolve during the decolorization process,which is beneficial to the recycling of the material.The decolorization process of the Reactive Turquoise Blue KNG simulated dye wastewater by the adsorpent and catalytic material conforms to the quasi-second-order kinetic model.At35°C,the decomposition process of hydrogen peroxide in the decolorization system of the adsorption catalytic material and in the decolorization system of the untreated material conform to the quasi-first order kinetic model.At 55?and 75?,the decomposition process of hydrogen peroxide in the decolorization system of the adsorption catalyst materia lconforms to the quasi-second-order kinetic model.In addition,in the heterogeneous Fenton catalytic system composed of the adsorpent and catalytic material and hydrogen peroxide,while the material adsorbs the dye,it can effectively catalyze the decomposition of hydrogen peroxide and destroy the dye structure.At the same time,compared with 35°C and 75°C,when decolorizing at 55°C,the fiber damage is smaller,the CODcr value of the decolorizing solution is lower,the material damage is smaller,and the dye degradation effect is better.However,the mineralization of dyes by this catalytic system is not thorough,and further research is needed.In addition,by adding the hydroxyl radical trapping agent dimethyl sulfoxide,the decolorization rate is reduced,indicating that the adsorpent and catalytic material has catalytic performance.It can catalyze hydrogen peroxide to decompose highly active hydroxyl radicals.And hydroxyl radicals can degrade the decolorizing liquid.However,the composition of the decolorization system is complex.Hydroxyl radicals may not be the only effective ingredient that destroys the structure of the dye.Further research is needed.Therefore,this research is conducive to the effective reuse of waste resources,is conducive to reducing waste water treatment costs,and protecting water resources.It is in line with the environment-friendly and resource-saving concepts.The research has practical application value and application development prospects,and can bring good environmental,social and economic benefits to society and enterprises. |
PDF Full Text Request