The aim of this study was to adsorb Ca, K, Mg and Na from seawater using sulfonated cornstalk. Cornstalk, a ligno-cellulose derived agricultural waste, was selected as an adsorbent. It was separated into the inside and outside and then sulfonated to be used as an adsorbent. Sulfonated cornstalk has higher ion exchange capacity than natural cornstalk, and the largest ion exchange capacity was 4.35 meq/g of sulfonated outside cornstalk. In addition, according to the FT-IR analysis, the surface of cornstalk was converted to negative charge after sulfonation, so that it was very easy to adsorb cationic ions in seawater. The adsorption efficiency of the sulfonated cornstalk increased by 27.96–41.58% for Ca, 22.61–26.78% for K, 27.96–44.14% for Mg and 18.47–27.16% for Na compared to the non-sulfonated cornstalk. Surface modified cornstalk with sulfuric acid can efficiently adsorb Ca, K, Mg and Na from seawater. This is meaningful not only in terms of recycling ligno-cellulose based waste, but also adsorbing useful resources from seawater.

本研究的目的是使用磺化玉米秸秆从海水中吸附 Ca、K、Mg 和 Na。玉米秸秆是一种木质纤维素衍生的农业废物，被选为吸附剂。经内外分离，磺化后用作吸附剂。磺化玉米秸秆比天然玉米秸秆具有更高的离子交换容量，最大的离子交换容量为4.35 meq/g磺化玉米秸秆外。此外，根据FT-IR分析，玉米秸秆磺化后表面带负电荷，很容易吸附海水中的阳离子。与非磺化玉米秸秆相比，磺化玉米秸秆对 Ca 的吸附效率提高了 27.96-41.58%，对 K 提高了 22.61-26.78%，对 Mg 提高了 27.96-44.14%，对 Na 提高了 18.47-27.16%。用硫酸进行表面改性的玉米秸秆可以有效吸附海水中的 Ca、K、Mg 和 Na。这不仅在回收基于木质纤维素的废物方面有意义，而且在从海水中吸收有用资源方面也很有意义。