Solar steam generation (SSG) is an effective way to mitigate the freshwater crisis. However, challenges still remain in scalable preparation, cost-effectiveness, and expanding the scope of practical applications for photothermal materials. Herein, a biomass-based solar steam generator (named OR-INP) with salt-resistant, oil-repellent, and anti-fouling performances is fabricated by grafting poly(ionic liquid)s onto celluloses from waste newspapers and then conducting oil-repellent modification. Benefiting from the broad solar absorption in the wet state (ca. 92%), low thermal conductivity (0.1108 W m–1 K–1), and strong hydrophilic and oleophobic properties, the solar evaporation efficiency is as high as 93.25% for pure water, 84.96% for 20 wt % NaCl, and 78.46% for 5 wt % oily wastewater, under 1 sun irradiation. Moreover, the aerogel still has excellent purification effects on solutions which contain organic dyes, heavy metal ions, or bacteria. Therefore, combining the merits of salt resistance, oil repellency, and wastewater treatment, this work develops the prospect of employing waste biomass resource-based photothermal materials and expands the practical application range of biomass-based evaporators.
Cellulose nanocrystals (CNC) were successfully prepared from waste newspapers through a simple pretreatment and hydrolysis process. The Fourier transform infrared spectroscopy (FTIR) result for the CNC suggested that no new chemical bonds were formed during the preparation of CNC. X-ray diffraction results indicated that the crystallinities of the deinked and untreated waste newspapers were 66% and 73.8%, respectively. Greater smoothness of the deinked waste newspapers fibers could be clearly observed by scanning electron microscope (SEM), which was attributed to the removal of ink from the chemical treatment. The transmission electron microscopy (TEM) and atomic force microscopy (AFM) results of the CNC revealed a needle-like natural fiber with a length of 300 nm to 600 nm, a diameter of 10 nm to 30 nm, and an aspect ratio in the 10 to 60 range. The obtained CNC particles were found to improve the physical properties of paper sheets, specifically that of the tear, tensile, and burst indices. The maximum increase in the physical properties was achieved with a 5.5% CNC addition.
Hang Chen,Yi Meng,Shiyao Jia,Wenqiang Hua,Yi Cheng,Jie Lu,Haisong Wang
Waste newspapers as absorbents to remove contaminant are limit to the extracting fibers from the newspaper at present, which lead to a complicated preparation and a difficult separation at the end of adsorption. In this study, we reported a simple, effective and renewable adsorption material assembled with waste newspaper and graphene oxide (GO). The adsorption and durability of the GO/paper have been evaluated using heavy metal ions solution and industrial effluent from the bleaching plant of paper industry, and the adsorption isotherm and kinetics are also valuated. The results indicate that the maximum adsorption capacities of GO/paper are 75.41 mg/g, 29.04 mg/g and 31.35 mg/g for Pb 2+ , Ni 2+ , and Cd 2+ , respectively, and the regeneration efficiency of the adsorbent to each ion is reduced by less than 10% within three testing cycles. Moreover, the GO/paper has a superior performance of removing the residual lignin and Chemical Oxygen Demand of the bleaching effluent, the adsorption of which are 64.4 mg/g and 225.7 mg/g, respectively. All these results highlight that the GO/paper as an environment-friendly, renewable and low-cost material possess an excellent adsorption capacity for both heavy metal ions and industrial wastewater.
危险品化学品经营许可证（带存储）