Chemically modified date pit (CM-DP) and olive stone (CM-OS) were studied for their biosorption capacity for hexavalent chromium (Cr(VI)) removal in the aqueous phase. The effect of changing the process conditions, such as the initial Cr (VI) concentration, pH, biosorbent dosage, ionic strength, presence of other ions and temperature were investigated. It showed that at pH = 2, biosorbent dosage >4 g/L and a low ionic strength, both biosorbents showed best biosorption capacity of the Cr(VI) removal. Various isotherm models were applied to fit the experimental data and the Freundlich isotherm model was the best fitting isotherm model for the biosorption experimental data of both biosorbents. The maximum biosorption capacities of CM-DP and CM-OS were found to be 82.63 and 53.31 mg/g respectively, which is comparable to other materials. In the kinetic study, the pseudo second order model can best describe the biosorption process of both biosorbents and the intraparticle diffusion was not the rate-limiting step indicating the contribution of film diffusion in the Cr(VI) removal processes.

研究了化学修饰的枣核（CM-DP）和橄榄石（CM-OS）在水相中去除六价铬（Cr（VI））的生物吸附能力。研究了改变工艺条件的影响，例如初始Cr（VI）浓度，pH，生物吸附剂量，离子强度，其他离子的存在和温度。结果表明，在pH = 2时，生物吸附剂量> 4 g / L且离子强度较低，两种生物吸附剂均显示出最佳的Cr（VI）去除生物吸附能力。应用各种等温模型拟合实验数据，Freundlich等温模型是两种生物吸附剂生物吸附实验数据的最佳拟合等温模型。CM-DP和CM-OS的最大生物吸附能力分别为82.63和53.31 mg / g，与其他材料相当。