Abstract

By grafting polysaccharides backbone of biopolymer (alginate) on synthetic polymer nanocomposite chains (PAMPS/NiFe₂O₄) to remove methylene blue and toxic heavy metal (Cu²⁺) from aqueous solutions, a superadsorbent was prepared. Using FTIR, TGA, X-ray diffraction, TEM, and SEM studied the structures of native and grafted alginate hydrogels. Adsorption experiments have been optimized using RSM/CCD response surface methodology and analyzed as a pH solution and adsorbent dose function. The initial concentrations of metal and dye, temperature, and contact time were also discussed and isothermal, thermodynamic adsorption, and kinetic theoretical constants were calculated as well. Results revealed that alginate grafted nanocomposite PAMPS/NiFe₂O₄ enhanced the proportion of methylene blue (MB) color removal up to (98.32%) and metal ion discharge (83%). The optimum cationic dye MB and Cu²⁺ ions adsorption capability were acquired at pH (5.75 and 4) and temperature (318.15 K) respectively. For both MB dye and Cu²⁺ ions, the pseudo-2nd-order model has effectively defined the adsorption kinetics and the Freundlich model could precisely explain adsorption isotherms than the Cu²⁺ Langmuir adsorption model, while the adsorption of MB dye showed a greater presence for both Freundlich and Langmuir designs. MB dye and Cu²⁺ ions have recorded the highest adsorption capacity of 275.6 and 22.81 mg/g respectively; indicating an efficient separation of adsorbent from aqueous solutions for both cationic dyes and toxic heavy metals.

Graphic Abstract

中文翻译：

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纳米结构NiFe 2 O 4 /聚AMPS接枝生物聚合物的优化及吸附行为

摘要

通过将生物聚合物（藻酸盐）的多糖骨架接枝到合成聚合物纳米复合链（PAMPS / NiFe ₂ O ₄）上，以从水溶液中去除亚甲基蓝和有毒重金属（Cu ²⁺），从而制备了超吸附剂。使用FTIR，TGA，X射线衍射，TEM和SEM研究了天然和接枝藻酸盐水凝胶的结构。吸附实验已使用RSM / CCD响应面方法进行了优化，并作为pH溶液和吸附剂剂量函数进行了分析。还讨论了金属和染料的初始浓度，温度和接触时间，还计算了等温，热力学吸附和动力学理论常数。结果表明，藻酸盐接枝纳米复合材料PAMPS / NiFe ₂O ₄提高了亚甲基蓝（MB）的颜色去除率（98.32％）和金属离子放电（83％）的比例。分别在pH（5.75和4）和温度（318.15 K）下获得了最佳的阳离子染料MB和Cu ²⁺离子吸附能力。对于MB染料和Cu ²⁺离子，伪二阶模型有效地定义了吸附动力学，Freundlich模型比Cu ²⁺ Langmuir吸附模型可以准确地解释吸附等温线，而MB染料的吸附表现出更大的吸附力。 Freundlich和Langmuir设计的存在。MB染料和Cu ²⁺离子的最高吸附容量分别为275.6和22.81 mg / g；这表明阳离子染料和有毒重金属均能有效地从水溶液中分离出吸附剂。

图形摘要