Hachani Rahima, Sabir Hazourli, Sana Nouacer, Zohra Khelaifia Fatma, Nesrine Nait Merzoug
Water Environ Res. 2017 Sep 1;89(9):827-839. doi: 10.2175/106143017X14902968254863.
The feasibility of using natural waste (raw date pits) as a low-cost adsorbent for the adsorption of an anionic dye (Congo red) from aqueous solution has been investigated. Adsorption optimized conditions were obtained at low dose 1 g/L, initial dye concentration 100 mg/L, pH 2, equilibrium contact time 120 min, and temperature 20 °C. The corresponding adsorption capacity was around 70 mg/g and could reach 150 mg/g by increasing the ionic strength of the dye solution (0.05 M CaCl2). These results are well modeled by Freundlich isotherm and kinetics study followed by pseudo second-order model. Thermodynamic parameters indicate that the adsorption process is endothermic and not spontaneous. The tests of desorption-regeneration showed that the studied adsorbent has the disadvantage of the loss of efficiency at its reuse but this is offset by its abundance. Based on these results, it can be used as competitive material for the removal of dyes.
研究了使用天然废弃物（生枣核）作为低成本吸附剂从水溶液中吸附阴离子染料（刚果红）的可行性。在低剂量1 g/L、初始染料浓度100 mg/L、pH值2、平衡接触时间120分钟和温度20°C的条件下获得了吸附优化条件。相应的吸附容量约为70 mg/g，通过增加染料溶液的离子强度（0.05 M CaCl2）可达到150 mg/g。这些结果通过Freundlich等温线和动力学研究以及伪二级模型得到了很好的模拟。热力学参数表明吸附过程是吸热的且非自发的。解吸-再生试验表明，所研究的吸附剂在重复使用时存在效率损失的缺点，但因其丰富性而得到弥补。基于这些结果，它可作为去除染料的有竞争力的材料。
