Journal of Saudi Chemical Society ( IF 5.6 ) Pub Date : 2021-06-15 , DOI: 10.1016/j.jscs.2021.101282 Zahrah Alhalili , Chourouk Romdhani , Hajer Chemingui , Moêz Smiri
Dithioterethiol (DTT) is a typical example of substances that contain sulfur with adverse effects on human health. Membranes-based cellulose acetate is used for the separation processes of thiols after the addition of ZnO and TiO2 nanoparticles. The measurement of permeability allows us to estimate the efficiency of membrane cleaning. The permeability increases from 8.82 L.h−1.m−2.bar−1 for CA membrane to 20.77 L.h−1.m−2.bar−1 for CA-TiO2 and 21.96 L.h−1.m−2.bar−1 for CA-ZnO membranes. For the permeability values of DTT, we noted that the CA-ZnO membrane has the highest permeability (50.66 L.h−1.m−2.bar−1). The CA-ZnO membrane changes from nanofiltration to ultrafiltration membrane. On the other hand, for the CA-TiO2 modified membrane, the permeability decreases to 6.00 L.h−1.m−2.bar−1. The CA-TiO2 membrane is in the category of reverse osmosis membranes. This variation is explained by the interaction between nanoparticles and DTT. The contact angles of the incorporated membranes decrease progressively with the addition of TiO2 or ZnO-NPs. The low contact angle with water means high hydrophilicity, indicated that the addition of TiO2 and ZnO improved the hydrophilicity of the membranes. The CA membrane had the highest contact angle with water of 92.64 ± 1.5°. After the addition of 0.1 g of TiO2 or ZnO, the contact angle of CA-TiO2 and CA-ZnO was reduced to 86.7 ± 0.2° and 70.51 ± 1.5°, respectively. Both TiO2 and ZnO caused strong hydrophilicity of membranes. From the elimination rates of DTT, it is concluded that there are optimal conditions of (1) Pressure P = 2 bars, (2) pH = 10 and (3) DTT concentration = 2 mM.
中文翻译:
通过醋酸纤维素 (AC) 和 AC 掺杂的 ZnO 和 TiO 2纳米粒子的膜从水中去除二硫代硫醇 (DTT)
Dithioterethiol (DTT) 是一种典型的含硫物质,对人体健康有不利影响。添加ZnO和TiO 2纳米颗粒后,基于膜的醋酸纤维素用于硫醇的分离过程。渗透率的测量使我们能够估计膜清洁的效率。渗透率从CA 膜的8.82 Lh -1 .m -2 .bar -1增加到CA-TiO 2 的20.77 Lh -1 .m -2 .bar -1和 21.96 Lh -1 .m -2 .bar -1用于 CA-ZnO 膜。对于 DTT 的渗透率值,我们注意到 CA-ZnO 膜具有最高的渗透率 (50.66 Lh -1 .m -2 .bar -1 )。CA-ZnO 膜从纳滤变为超滤膜。另一方面,对于CA-TiO 2改性膜,渗透率降低至6.00 Lh -1 .m -2 .bar -1。CA-TiO 2膜属于反渗透膜的范畴。这种变化可以通过纳米颗粒和 DTT 之间的相互作用来解释。随着TiO 2的加入,掺入的膜的接触角逐渐减小或 ZnO-NP。与水的低接触角意味着高亲水性,表明TiO 2和ZnO的加入提高了膜的亲水性。CA 膜与水的最高接触角为 92.64 ± 1.5°。添加0.1g TiO 2或ZnO后,CA-TiO 2和CA-ZnO的接触角分别降低到86.7±0.2°和70.51±1.5°。TiO 2和ZnO均引起膜的强亲水性。从 DTT 的消除率可以得出结论,存在以下最佳条件:(1) 压力 P = 2 bar,(2) pH = 10 和 (3) DTT 浓度 = 2 mM。