The uptake of brown marine algae, Sargassum myriocystum has been utilized for the exclusion of Cd(II) metal from wastewater. Various parameters such as solution pH, optimum temperature, biomass concentration, the contact time and agitation speed have been analyzed for the effective biosorption of Cd(II). Desorption studies of Cd(II) have been performed with various desorbent such as H₃PO₄, HNO₃, HCL, H₂SO₄, NaOH, NaCl, and H₂O among which 0.1M/L HCl is found to be the better desorbing agent. SEM-EDX and FTIR analyses were utilized for metal-algal interaction study. The thermodynamic parameters such as free energy change (ΔG°), enthalpy change (∆Hº) and entropy change (∆Sº) have been calculated through the Van’t Hoff plot. A positive value of 14.72 ∆S Jmol-1K-1, a negative value of free energy (ΔG°) and 42.21 kJ/mol of ∆H kJmol-1 at all the temperatures indicated that the process is feasible and spontaneous. Hence, S. myriocystum is an effective and prosperous cost-effective biosorbent approach for Cd(II) from various industrial wastes due to its fast sorption rate, high selectivity and great uptake capacity.

中文翻译：

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褐藻 Sargassum myriocystum 从水溶液中吸收重金属 Cd(II)

棕色海藻的吸收，马尾藻已被用于从废水中排除 Cd(II) 金属。已经分析了各种参数，如溶液p H、最适温度、生物质浓度、接触时间和搅拌速度，以用于 Cd(II) 的有效生物吸附。Cd(II) 的解吸研究已使用各种解吸剂进行，例如 H ₃ PO ₄、HNO ₃、HCL、H ₂ SO ₄、NaOH、NaCl 和 H ₂O 其中 0.1M/L HCl 被发现是更好的解吸剂。SEM-EDX 和 FTIR 分析用于金属-藻类相互作用研究。自由能变化 (ΔG°)、焓变 (ΔH°) 和熵变 (ΔS°) 等热力学参数已通过范特霍夫图计算得出。在所有温度下，14.72 ΔS Jmol-1K-1 的正值、自由能 (ΔG°) 的负值和 ΔH kJmol-1 的 42.21 kJ/mol 表明该过程是可行和自发的。因此，S. myriocystum由于其吸附速度快、选择性高和吸收能力强，是一种从各种工业废物中提取 Cd(II) 的有效且经济高效的生物吸附剂方法。