Abstract：
In this study, to develop efficient adsorbents in removing water pollution, new cellulose-citric acid-chitosan@metal sulfide nanocomposites (CL-CA-CS@NiS and CL-CA-CS@CuS) were synthesized by one-pot reaction at mild conditions and characterized using X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscope (SEM), Energy Dispersive X-ray (EDX) and Brunauer-Emmett-Teller (BET) isotherm. The results of characterization techniques confirm that the desired compounds have been successfully synthesized. The as-prepared composites were applied for the removal of methyl orange (MO) dye from aqueous solutions using a batch technique, and the effect of key factors such as initial pH, shaking time, MO concentration, temperature and adsorbent dose were investigated and discussed. Adsorption results exhibited positive impact of temperature, shaking time and adsorbent dose on the MO removal percent. The MO removal percent has been increased over a wide range of pH from 2 (27.6 %) to 6 (98.8 %). Also, almost being constant over a wide range of MO concentration (10-70 mg/L). The results demonstrated that the maximum removal percentage of MO dye (98.9 % and 93.4 % using CL-CA-CS@NiS and CL-CA-CS@CuS, respectively) was achieved under the conditions of pH 6, shaking time of 120 min, adsorbent dose of 0.02 g, MO concentration of 70 mg/L and temperature of 35 °C. The pseudo-second-order (PSO) and Langmuir models demonstrated the best fit to the kinetic and equilibrium data. Also, the thermodynamic results showed that the MO removal process is endothermic and spontaneous in nature. The MO adsorption can be happened by different electrostatic attraction, n-π and π-π stacking and also hydrogen bonding interaction. In addition, antibacterial activity of CL-CA-CS@NiS and CL-CA-CS@CuS nanocomposites exhibited a superior efficiency against S. aureus.
摘要：
在这项研究中,开发去除水污染的高效吸附剂，通过一锅法在温和条件下合成了新型纤维素-柠檬酸-壳聚糖@金属硫化物纳米复合材料（CL-CA-CS@NiS和CL-CA-CS@CuS），并使用X射线粉末衍射（XRD）进行了表征，热重分析（TGA），扫描电子显微镜（SEM），能量色散X射线(EDX)和Brunauer-Emmett-Teller(BET)等温线。表征技术的结果证实了所需化合物已被成功合成。所制备的复合材料用于使用间歇技术从水溶液中去除甲基橙（MO）染料，以及初始pH等关键因素的影响，摇动时间，MO浓度,温度和吸附剂剂量进行了研究和讨论。吸附结果表现出温度的积极影响，摇动时间和吸附剂剂量对MO去除百分比的影响。MO去除百分比在从2(27.6%)至6(98.8%)的宽pH范围内增加。此外，在广泛的MO浓度（10-70mg/L）范围内几乎是恒定的。结果表明，使用CL-CA-CS@NiS和CL-CA-CS@CuS，MO染料的最大去除率为98.9%和93.4%，分别）在pH6，振荡时间120分钟的条件下实现，吸附剂剂量为0.02g，MO浓度为70mg/L，温度为35°C。伪二阶（PSO）和Langmuir模型证明了对动力学和平衡数据的最佳拟合。此外，热力学结果表明，MO去除过程本质上是吸热和自发的。通过不同的静电引力可以发生MO吸附，n-π和π-π堆叠以及氢键相互作用。此外,CL-CA-CS@NiS和CL-CA-CS@CuS纳米复合材料的抗菌活性对金黄色葡萄球菌表现出优异的效果。
