Simultaneous adsorption of methyl orange and methylene blue from aqueous solution using amino functionalized Zr-based MOFs

Nowadays efficient and rapid removal of organic dyes from wastewater is still a complicated task with great challenge. Herein, the amino groups functionalized UiO-66 (denoted as UiO-66-NH 2 ) was synthesized via a one-step process and then applied in simultaneous removal of methyl orange (MO) and methylene blue (MB) for the first time. The as-prepared UiO-66-NH 2 showed excellent adsorption ability to both MO and MB, and the maximum adsorption capacities were as high as 148.4 (MO: pH = 5, T = 25 °C) and 549.6 (MB: pH = 9, T = 25 °C) mg/g, respectively. Significantly, UiO-66-NH 2 exhibited highly pH-dependent selective adsorption for MO and MB. More interestingly, the simultaneous removal of MO and MB from the MO/MB mixture solution could be achieved by UiO-66-NH 2 under neutral condition. The adsorption mechanisms and reusability were also investigated. Overall, UiO-66-NH 2 could be a perfect candidate for removing MO and MB application in dye-containing wastewater treatment . And the results from this study also provided some new insights for the treatment of wastewater containing various dyes.