Investigation On The Wastewater Treatment By Silicon-based Mesoporous Material

Heavy metal chromium(VI), phosphate, metllylene blue(MB) and rhodamine B(RB) in the aqueous solutions not only pollute the water environment, damage of biological diversity, and serious threat to human health. Recently, there is a shortage of water resources, protect the safety of water body, prevent water pollution, the timely and effective treatment of the heavy metal chromium(VI), phosphate, metllylene blue(MB) and rhodamine B(RB) in the aqueous solutions has become more and more important.Now, adsorption is a routine method in the treatment of heavy metal chromium(VI), phosphate, metllylene blue(MB) and rhodamine B(RB) in the aqueous solutions. The key is to find a kind of efficient and cheap adsorption material. Silicon is abundant and accessible in the nature, mesoporous silica has big specific surface area, regular channel and vast silicon hydroxyl, is a good adsorption materials. Especially the functionalized mesoporous silica can show function that the pure silicon do not has, Improve the adsorption selectivity.The paper includes five parts:In the first part, we We synthesized the HMS and Fe/HMS. On one hand, it shows a characteristic peak in the 2?=2o by the XRD characterization. It shows that we have successfully create HMS and Fe/HMS with a feature of short-range disorderly and long range order. On the other hand, by the N2 adsorption-stripping characterization, it show its isothermal model of adsorption-stripping belongs to Langmuir(?) curve, HMS,s pore size is focused on 3.05 nm, Specific surface area is 945.387mg/g; Fe/HMS,s pore size is focused on 2.72 nm, Specific surface area is 858.136mg/g.In the second part,we have the study of the adsorption of the rhodamine B(RB) in the aqueous solutions. The results of the adsorption thermodynamics and dynamics analysis show that the adsorption process of rhodamine B by HMS and Fe/HMS is applicable to the Langmuir adsorption isotherm models and fake secondary dynamics equation, they showed that the adsorption process belongs to monolayer adsorption, the adsorption rate is controlled by surface adsorption process, the theory of saturated adsorption capacity were 137.3mg/g and 84.03mg/g; At the same time, We studied the law of the adsorption under different conditions, such as initial concentration, adsorbent dosage, temperature, p H, time, the results show that for the room temperature, for 25 m L of 50mg/L system simulation wastewater, the most optimal adsorption conditions is p H =5, the amount of the HMS and the Fe/HMS is 15 mg and 30 mg, the time is 60 min, the removal rate is 98.5% and 98.9%.In the third part, we have the study of the adsorption of the metllylene blue(MB) in the aqueous solutions. The results of the adsorption thermodynamics and dynamics analysis show that the adsorption process of metllylene blue(MB) by HMS and Fe/HMS is applicable to the Langmuir adsorption isotherm models and fake secondary dynamics equation, they showed that the adsorption process belongs to monolayer adsorption, the adsorption rate is controlled by surface adsorption process, the theory of saturated adsorption capacity were 150.3mg/g and 106.3mg/g; At the same time, We studied the law of the adsorption under different conditions, such as initial concentration, adsorbent dosage, temperature, p H, time, the results show that for the room temperature, for 25 m L of 50mg/L system simulation wastewater, the most optimal adsorption conditions is p H =6.5, the amount of the HMS and the Fe/HMS is 8mg and 15 mg, the time is 60 min, the removal rate is 91.07% and 97.7%.In the forth part, we have the study of the adsorption of the chromium(VI) in the aqueous solutions. The results of the adsorption thermodynamics and dynamics analysis show that the adsorption process of chromium(VI) by HMS and Fe/HMS is applicable to the Langmuir adsorption isotherm models and fake secondary dynamics equation, they showed that the adsorption process belongs to monolayer adsorption, the adsorption rate is controlled by surface adsorption process, the theory of saturated adsorption capacity were 3.305mg/g and 9.37mg/g; At the same time, We studied the law of the adsorption under different conditions, such as initial concentration, adsorbent dosage, temperature, p H, time, the results show that for the room temperature, for 25 m L of 15mg/L system simulation wastewater, the most optimal adsorption conditions is p H =2, the amount of the HMS and the Fe/HMS is 16 mg, the time is 15 min, the removal rate is 30.1% and 73.6%.In the fifth part, we have the study of the adsorption of the phosphate in the aqueous solutions. The results of the adsorption thermodynamics and dynamics analysis show that the adsorption process of phosphate by HMS and Fe/HMS is applicable to the Langmuir adsorption isotherm models and fake secondary dynamics equation, they showed that the adsorption process belongs to monolayer adsorption, the adsorption rate is controlled by surface adsorption process, the theory of saturated adsorption capacity were 2.158mg/g and 8.53mg/g; At the same time, We studied the law of the adsorption under different conditions, such as initial concentration, adsorbent dosage, temperature, p H, time, the results show that for the room temperature, for 25 m L of 15mg/L system simulation wastewater, the most optimal adsorption conditions is p H=2, the amount of the HMS and the Fe/HMS is 16 mg, the time is 15 min, the removal rate is 16.6% and 44.29%.