Exploration Of Controllable Synthesis Bio-sorbents Prepared From Rice Husks Based On Chemical Means

With the rapid growth of population and the development of economy, the problem of environmental crisis has aroused public concern. The waste water from the dyeing industry has been one of the major sources of many environmental problems. Amongst them, methylene blue(MB) is being widely applied in dyes for silk, wood and dying cotton. The contaminant not only deteriorates the water quality but impacts human health due to its toxicity. Now, some agricultural wastes/by-products becomes good alternatives for preparation of adsorbent, such as straw, coconut shell, sawdust and rice husk, etc. In the present study, a modified method was applied to use compound of silicon and carbon parts in common through combinational procedures of sulfuric acid-assisted low-temperature carbonization, a type of high-performance bio-sorbent that can efficiently remove dye from aqueous systems was prepared by directly utilizing rice husks.The main research work is as follow:1. Using compound of silicon and carbon parts in common through combinational procedures of sulfuric acid-assisted low-temperature carbonization and oxidization treatment with a saturated solution of(NH4)2S2O8 in H2SO4, a type of high-performance bio-sorbent(RH-c-ox) that can efficiently remove dye from aqueous systems was prepared by directly utilizing rice husks.2. Low-temperature solution-carbonized rice husk(RH-c), β-cyclodextrins(β-CD) and Fe3O4 were synergically combined to prepare a new kind of multifunctional bioadsorbent, i.e. RH-c/Fe3O4/CD, and applied for the adsorption of methylene blue(MB) from aqueous solution.3. The morphology and surface chemistry of adsorbent was characterized using N2-sorption, FTIR, XRD, XPS, SEM,TEM, NMR and VSM etc.4. The adsorption performance of MB on rice husk derived sorbents were systematically discussed, and the kinetics and thermodynamic model of the adsorption process were studied.