Heavy metal ions and oil are the two harmful substances that cause serious water pollution. It has become a new research hotspot to develop lignocellulose-based adsorbents with both the performances of heavy metal ion adsorption and oil/water separation. In this paper, paper-based lignocellulosic adsorption-separation materials with high wet strength, high adsorption capacity and efficient oil/water separation and recycling performance were prepared from polar chemimechanical pulp by the simple process of papermaking and one-step dip coating. Maleic anhydride and sodium hypophosphate, which can react with the hydroxyl groups of cellulose, were used to increase the wet strength and the carboxyl content of the adsorption-separation papersheets. Both the wet strength and carboxyl content increase upon increasing the beating degree and the dosage of maleic anhydride. The wet strengths reach more than 35 % of their dry strengths and the carboxyl contents are in the range of 0 - 0.69 mmol/g. Adsorption kinetic and thermodynamics studies of Cu(II) and Pb(II) explain pseudo-second-order equation and Langmuir model as the best fit. For the papersheets loaded with porous zeolite filler, the theoretical maximum adsorption capacities of Cu(II) and Pb(II) are high up to 56.46 and 126.58 mg/g, respectively. In addition, the functional papersheets with specific micro-nano pore structure and high hydrophilicity show the good underwater oil repellency, and are able to effectively separate the mixture of oil and water. The underwater contact angles to various oil substances including chloroform, petroleum ether, toluene, and n-hexaneare are higher 150°, and the oil/water separation efficiencies are higher than 99%. The membrane fluxes can be tuned in the range of 300-11,000 L/(m<sup>2 </sup>h). The synthetic strategy of multifunctional paper based on polar chemimechanical pulp provides new ideas and methods for the full and high-value utilization of lignocellulose.

High-wet-strength lignocellulosic paper for heavy metal ion adsorption and oil/water separation

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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