Abstract
The increasingly serious problem of mercury pollution has caused wide concern, and exploring adsorbent materials with high adsorption capacity is a simple and effective approach to address this concern. In the recent study, dialdehyde cellulose (DAC), cyanoacetohydrazide (CAH), and carbon disulfide (CS(2)) are used as raw materials for the (DAC@CAH@SK(2)) preparation material through the three-steps method. By utilizing the following characterization techniques; thermogravimetric analysis (TGA), N(2) adsorption-desorption isotherm (BET), elemental analysis, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD), (1)HNMR and Energy Dispersive X-ray Spectroscopy (EDS) of DAC@CAH@SK(2) composite. The point of zero charge (pH(PZC)) for the prepared DAC@CAH@SK(2) also was examined. From the batch experiments, the optimum conditions were found to be pH (5-8), an Hg(2+) concentration of 150 mg/L, a DAC@CAH@SK(2) dose of 0.01 g, and a contact time of 180 min with a maximum adsorption quantity of 139.6 mg/g. The process of Hg(2+) adsorption on the DAC@CAH@SK(2) material was spontaneous exothermic, monolayer chemisorption, and well-fitted to Langmuir and pseudo-2nd-order models. The DAC@CAH@SK(2) selectivity towards the Hg(2+) was examined by investigating the interfering metal ions effect. The DAC@CAH@SK(2) was successfully applied for the Hg(2+) removal from synthetic effluents and real wastewater samples with a recovery % exceeding 95%. The prepared DAC@CAH@SK(2) was regenerated using a mixture of EDTA and thiourea. Also, FT-IR analysis indicates that the synergistic complexation of N and S atoms on DAC@CAH@SK(2) with Hg(II) is an essential factor leading to the high adsorption capacity.