Department of Chemistry, Islamia College University, Peshawar, Khyber Pakhtunkhwa, 25120, Pakistan.
Collaborative Innovation Center of Sustainable Energy Materials, Guangxi University, Nanning, 530004, People's Republic of China.
Environ Sci Pollut Res Int. 2019 May;26(14):14339-14349. doi: 10.1007/s11356-019-04611-6. Epub 2019 Mar 13.
Thermodynamic and kinetic aspects for the biosorptive removal of Pb, Cd, and Cr metals from water using Chemically Modified Leaves of Salvia moorcroftiana (CMSML) were determined. Different parameters including pH, temperature, metal's initial concentration, biomass dosage, and contact time were optimized. Optimum biosorptions of Pb, Cd, and Cr were attained at pH values of 6.0, 7.0, and 3.0 respectively. Batch experiments showed maximum removal of both Pb and Cd at 40 °C and that of Cr at 30 °C. Biosorption capability of CMSML was observed to decrease with raising temperature. Optimal equilibrium times for Pb, Cd, and Cr uptake were 120, 60, and 120 min respectively. Based on the values of regression correlation coefficients (R), the current data is explained better by applying Langmuir isotherms than the Freundlich model. Maximum biosorbent capabilities (q) for Pb, Cd, and Cr were approximately 270.27, 100.00, and 93.45 mg/g respectively. Thermodynamically, removal of all the three metal ions was shown to be exothermic and spontaneous.
采用化学改性的罗勒（Salvia moorcroftiana）叶片（CMSML）从水中生物吸附去除 Pb、Cd 和 Cr 金属，确定了其热力学和动力学方面。优化了包括 pH 值、温度、金属初始浓度、生物量剂量和接触时间在内的不同参数。Pb、Cd 和 Cr 的最佳吸附在 pH 值为 6.0、7.0 和 3.0 时分别达到。批实验表明，Pb 和 Cd 的最大去除率均在 40°C 时达到，而 Cr 的最大去除率在 30°C 时达到。CMSML 的生物吸附能力随温度升高而降低。Pb、Cd 和 Cr 吸收的最佳平衡时间分别为 120、60 和 120 分钟。根据回归相关系数（R）的值，当前数据通过应用朗缪尔等温线比弗伦德利希模型更好地解释。Pb、Cd 和 Cr 的最大生物吸附能力（q）分别约为 270.27、100.00 和 93.45mg/g。热力学上，所有三种金属离子的去除均表现为放热和自发的。
