Chemical Engineering Department, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, Santa Maria, RS, 97105-900, Brazil.
Department of Chemistry, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, Santa Maria, RS, 97105-900, Brazil.
Environ Sci Pollut Res Int. 2019 Nov;26(31):32198-32208. doi: 10.1007/s11356-019-06386-2. Epub 2019 Sep 7.
An alternative and low-cost adsorbent (CS-APTES) was developed by the functionalization corn stover (CS) with 3-aminopropyltrietoxysilane (APTES) using a simple method. Several analytical techniques were used to prove the functionalization and then, CS-APTES was employed to adsorb Reactive Red 141 (RR141) dye from aqueous solutions. The functionalization with APTES caused an increase of 15 times in the adsorption capacity. The adsorption of RR141 on CS-APTES was favored at pH 3.0 using a dosage of 3.0 g L. The adsorption equilibrium was reached within 4 h, being the process thermodynamically favorable, endothermic, and controlled by chemisorption. The maximum adsorption capacity was 15.65 mg g. CS-APTES was efficient to treat a colored effluent containing various ions and molecules. The use of 10 g L of CS-APTES was sufficient to decolorize more than 98% of this effluent. It was concluded that CS-APTES can be easily prepared from CS, generating an efficient and low-cost adsorbent which, in turn, is able to treat colored effluents.
采用简单的方法，通过 3-氨丙基三乙氧基硅烷（APTES）对玉米秸秆（CS）进行功能化，制备了一种替代的、低成本的吸附剂（CS-APTES）。使用几种分析技术证明了其功能化，然后，CS-APTES 被用于从水溶液中吸附活性红 141（RR141）染料。APTES 的功能化导致吸附容量增加了 15 倍。在 pH 值为 3.0 时，使用 3.0 g L 的剂量有利于 RR141 在 CS-APTES 上的吸附。吸附平衡在 4 小时内达到，该过程是热力学有利的、吸热的，并且受化学吸附控制。最大吸附容量为 15.65 mg g。CS-APTES 对含有各种离子和分子的有色废水处理有效。使用 10 g L 的 CS-APTES 足以使这种废水的脱色率超过 98%。结果表明，CS-APTES 可以很容易地从 CS 制备，生成一种高效、低成本的吸附剂，能够处理有色废水。
