Singh Asha, Arora Dinesh, Bala Renu, Khokhar Anil, Kumar Sunil
Department of Environmental Sciences, Maharshi Dayanand University, Rohtak, Haryana, 124001, India.
Environ Sci Pollut Res Int. 2023 Oct;30(48):105415-105428. doi: 10.1007/s11356-023-29834-6. Epub 2023 Sep 16.
Nanocomposite adsorbents for wastewater treatment gained popularity in recent times. In the present study, nanoparticles prepared from lanthanum have been loaded on the powdered form of aquatic plants Salvinia molesta (S. molesta) and Typha latifolia (T. latifolia). These new adsorbents were NPS (nanoparticle-loaded S. molesta) and NPT (nanoparticle-loaded T. latifolia). The batch study was carried out to assess the effect of several factors on the adsorption of Cr(VI) by novel adsorbents NPS and NPT. XRD, SEM, FTIR, EDX, and Zeta potential were used for the characterization of nanoparticles formed and novel adsorbents. The maximal adsorption was noticed by both adsorbents at pH 1, 20 ppm of initial metal concentration, and 1 h of contact period with 150 rpm at 25 ℃. The adsorbent dose of 60 mg and 80 mg was observed as the equilibrium dose for NPS and NPT, respectively. The maximum adsorption capacity observed was 27.18 mg/g for NPS and 19.85 mg/g for NPT. Freundlich isotherm was better fitted for both adsorbents. Pseudo-second-order kinetics depicts the better mechanism of adsorption with R = 0.9995 and 0.9982 for NPS and NPT, respectively. Thermodynamic parameters show that the adsorption process was exothermic and spontaneous.
用于废水处理的纳米复合吸附剂近年来颇受关注。在本研究中，由镧制备的纳米颗粒已负载在水生植物槐叶萍（S. molesta）和宽叶香蒲（T. latifolia）的粉末形式上。这些新型吸附剂分别是NPS（负载纳米颗粒的槐叶萍）和NPT（负载纳米颗粒的宽叶香蒲）。进行了批次研究，以评估多种因素对新型吸附剂NPS和NPT吸附Cr(VI)的影响。使用XRD、SEM、FTIR、EDX和Zeta电位对形成的纳米颗粒和新型吸附剂进行表征。两种吸附剂在pH值为1、初始金属浓度为20 ppm、接触时间为1小时、25℃下转速为150 rpm时吸附量最大。观察到NPS和NPT的吸附剂剂量分别为60 mg和80 mg时达到平衡剂量。观察到的最大吸附容量NPS为27.18 mg/g，NPT为19.85 mg/g。Freundlich等温线对两种吸附剂拟合效果更好。准二级动力学分别以R = 0.9995和0.9982描述了NPS和NPT更好的吸附机制。热力学参数表明吸附过程是放热且自发的。
