汞(II)引起的水污染对环境和公众健康产生有害影响。设计和制造环保的生物吸附剂以从水溶液中有效去除Hg(II)是一种有前途的策略。在这里,通过装饰苹果渣纤维素,合成了一系列具有不同世代(G)席夫碱官能化的聚(酰胺胺)(PAMAM)树枝状聚合物(SA-G0/CE,SA-G1.0/CE和SA-G2.0/CE)。SA-G0/CE的结构,对SA-G1.0/CE和SA-G2.0/CE进行了表征,并综合考虑各种因素对其吸附性能进行了综合测定。SA-G0/CE的最大吸附容量,Hg(II)的SA-G1.0/CE和SA-G2.0/CE分别为1.18、1.73和1.88mmol·g-1。与其他报道的吸附剂相比,所制备的生物吸附剂表现出竞争性吸附能力。此外,在Ni(II)共存的情况下,它们对Hg(II)表现出显著的吸附选择性,Cd(II),Mn(II),或Pb(II)。该生物吸附剂在实际水样中表现出令人满意的吸附性能,可重复使用,具有良好的再生性能。吸附机理揭示了OH的官能团,-CONH-,CN和NC参与了对Hg(II)的吸附。这项工作不仅为实现苹果渣的再利用开辟了一条途径,而且还提供了一种有前途的策略,可以构建有效的生物吸附剂以从水溶液中清除Hg(II)。
Water pollution caused by Hg(II) exerts hazardous effect to the environment and public health. The design and fabrication of eco-friendly bioadsorbents for efficient removal of Hg(II) from aqueous solution is a promising strategy. Herein, a series of bioadsorbents were synthesized by the decoration of apple residue cellulose with different generation (G) Schiff base functionalized poly(amidoamine) (PAMAM) dendrimers (SA-G0/CE, SA-G1.0/CE and SA-G2.0/CE). The structures of SA-G0/CE, SA-G1.0/CE and SA-G2.0/CE were characterized and their adsorption performances were determined comprehensively by considering various factors. The maximum adsorption capacity of SA-G0/CE, SA-G1.0/CE and SA-G2.0/CE for Hg(II) are 1.18, 1.73 and 1.88 mmol·g-1, respectively. The as-prepared bioadsorbents exhibit competitive adsorption capacity as compared with other reported adsorbents. Moreover, they exhibit remarkable adsorption selectivity toward Hg(II) with the coexistence of Ni(II), Cd(II), Mn(II), or Pb(II). The bioadsorbents display satisfactory adsorption performance in real water sample and can be reused with good regeneration property. Adsorption mechanism reveals that the functional groups of OH, -CONH-, CN and NC take part in the adsorption for Hg(II). The work not only opens a pathway to realize the reuse of apple residue, but also provides a promising strategy to construct efficient bioadsorbents for the decontamination of Hg(II) from aqueous solution.