Heavy metal industries pose a serious threat to the environment. Conventional methods used for heavy metal removal are generally not always low-cost and environmentally friendly. So, researchers focused to investigate alternative biosorbents for the uptake of heavy metal. In this study, Laurus nobilis leaves (LNL) were used as a biosorbent for the uptake of toxic metals such as Pb2+ and Cd2+ from aqueous solutions. Batch biosorption experiments under varied conditions, such as biosorbent dosage, solution pH, heavy metal concentration, biosorption time, ionic strength, humic acid effect and competitive metal ions (Cd(II), Pb(II), Cu(II) and Zn(II)) were performed. The biomass was characterized using FT-IR spectra and SEM images. The nonlinearized and linearized isotherm models were compared and discussed. A single-stage batch bioreactor system for each heavy metal based on the best fit nonlinear isotherm model also has been presented. The biosorption of Pb(II) on LNL fitted better in the Langmuir model and Cd(II) biosorption fitted better in the Freundlich model by nonlinearized equations. The LNL exhibited the maximum monolayer biosorption capacities (qmax) of 7.1 and 32.5 mg/g for cadmium and lead, respectively. LNL showed great potential especially in Pb(II) uptake. LNL may be promising for heavy metal removal from aqueous environment.

中文翻译：

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通过保留在月桂叶上来去除重金属的模型留下了生物量：线性和非线性等温线和设计。

重金属工业对环境构成严重威胁。用于去除重金属的常规方法通常并不总是低成本且环境友好的。因此，研究人员致力于研究替代性生物吸附剂对重金属的吸收。在这项研究中，月桂叶（LNL）被用作从水溶液中吸收有毒金属（例如Pb2 +和Cd2 +）的生物吸附剂。在不同条件下进行分批生物吸附实验，例如生物吸附剂剂量，溶液pH，重金属浓度，生物吸附时间，离子强度，腐殖酸效应和竞争性金属离子（Cd（II），Pb（II），Cu（II）和Zn（ II））进行。使用FT-IR光谱和SEM图像表征生物质。对非线性和线性等温线模型进行了比较和讨论。还提出了基于最佳拟合非线性等温线模型的每种重金属的单级批处理生物反应器系统。通过非线性方程，LNL上Lb对Pb（II）的生物吸附效果更好，在Freundlich模型中对Cd（II）的吸附效果更好。LNL对镉和铅的最大单层生物吸附容量（qmax）分别为7.1和32.5 mg / g。LNL显示出巨大的潜力，尤其是在Pb（II）吸收方面。LNL有望从水性环境中去除重金属。LNL对镉和铅的最大单层生物吸附容量（qmax）分别为7.1和32.5 mg / g。LNL显示出巨大的潜力，尤其是在Pb（II）吸收方面。LNL有望从水性环境中去除重金属。LNL对镉和铅的最大单层生物吸附容量（qmax）分别为7.1和32.5 mg / g。LNL显示出巨大的潜力，尤其是在Pb（II）吸收方面。LNL有望从水性环境中去除重金属。