| With the development of global integration, the oil treated as strategic supplies gets much more attentions of governments, and offshore oil exploration and offshore oil transport have been considerable developed. Unfortunately, the offshore oil spill are reported frequently worldwide. If these oil spills in the sea can not be treated timely, the oil will continue to spread, and destroys the local ecological environment seriously. Meanwhile, a lots of high-quality water resources were polluted by industrial waste water, and untreated daily chemical organic solvent was indiscriminate discharged, which are significant challenges for the limited self-recovery capability of natural environment. How to purify these contaminated water resources effectively and protect the environment has become a tough task for the governments and scientists. Therefore, in this paper, we explored a simple and effective method to prepare the three-dimensional MoS2 oil-water separation/adsorption materials and the related performance for oil-water separation and the absorption of organic pollutants from water were probed into. The main findings are listed as follows:(1) Superhydrophobic and superoleophilic MoS2 sponge(SMS) was prepared by a dip-coating method on a flexible melamine-formaldehyde sponge. Different loadings of MoS2 nanosheets on the sponges were controlled by repeating the ‘‘dipping and drying'' process. when the MoS2 loading index increases to 8.4%, water droplets attained quasi-spherical shapes on the sponge surfaces with CAs of 150°±2°, indicating its superhydrophobic behavior. At different pH values and temperatures, the material maintains a high stability of its superhydrophobic behavior. It also has a high oil-absorbing ability, which can absorb its own weight of 82-159 times for different organic solvents. After oil absorption cycles for 50 times, oil-absorbing capacity of the material remained unchanged. Even after the testing for 30 cycles in a mixture of oil and water at 80 ?, the oil-water separation performance is almost as same as room temperature. The mechanical properties of materials was further tested. When bending and twisting deformation was applied, it can quickly recover to the original form, and stand up to the cyclic loading for 1000 times. In addition, the fire flame retardancy measurement of the SMS was designed and the results showed it had a good flame retardancy. Here, we achieved continuous collection of oil in situ from a water surface based on a simple combination of SMS with pipes and a peristaltic pump. The shaking of the SMS on the water surface did not affect the oil-separation efficiency. The stability of the device was further studied and it could be found that excellent oil-water separation effect could be remained after the continuous work up to 10 hrs.(2) Using hydrothermal method and dip-coating method, we successfully synthesized MoS2 adsorption sponge on the flexible melamine sponge. The obtained specimens were examined by XRD, Raman, TEM and SEM. Based on adsorption of methyl orange, we checked the performance of removal of organic pollutants of MoS2 sponge. When adsorption time was 12 min, the decolorization rate of methyl orange solution reached 99.7%. Compared with traditional powder adsorbent material, the as-prepared three-dimensional porous adsorbent material can avoid a secondary pollution successfully.(3) Combining SMS with MoS2 adsorption sponge, we designed a new device which could possess both oil-water separation and adsorption capacity. Our study demonstrates that this novel device with multiple functions is very efficiently and effectively, e.g., not only could its oil-water separation works efficiently, but also it could achieve the goal for purifying the water resource. |
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