Synthesis of glass fiber sphere using waste printed circuit board to support MIL-100(Fe) for dye adsorption in water.
Glass fiber sphere (GFS), used as support of MIL-100(Fe) to treat dye wastewater, was successfully synthesized using glass fibers from waste printed circuit board. Structural and textural features of MIL-100(Fe) supported by GFS (GFSMIL-100(Fe)) were characterized by different techniques. GFSMIL-100(Fe) showed higher specific surface area and better rhodamine B (RHB) removal performance as well as reusability. RHB removal percentage by GFSMIL-100(Fe) reached 92% in 11 h, compared with 79% in 7 h of MIL-100(Fe). The highest RHB removal rate was obtained with the GFSMIL-100(Fe) concentration of 20 gL. Increasing RHB concentration over 100 mgL reduced the time needed for saturated adsorption from 11 to 7 h. The best RHB removal performance of GFSMIL-100(Fe) was obtained at pH 3, and the removal percentage was almost the same in the pH range 5-11. The adsorption data fitted the pseudo-second-order kinetics better than the pseudo-first-order kinetics, and the adsorption isotherm data fitted Langmuir model better than Freundlich model. MIL-100(Fe) synthesized in organic solvents showed higher loading rate than that obtained in water. GFSMIL-100(Fe) also showed promising removal performances for methylene blue, acid orange 7, and malachite green in water. The removal percentage of RHB was still 80% even after being used for 3 times. The results of this study indicate the prospect of synthesizing GFS with glass fibers from waste printed circuit boards and its use as the support of MIL-100(Fe).