Polymer/Fe₃O₄ composite was synthesized via radical polymerization. Acrylamide was used as monomer and copolymerized with 1,3,5-triacryloylhexahydro-1,3,5-triazine in the presence of Fe₃O₄ particles. The obtained polymer was hydrolyzed by N,N,N’,N’-tetramethylethylenediamine to increase ionized groups amount. Dried and powdered composite was used for removal of Cd²⁺, Pb²⁺ and Cr³⁺ in batch mode. Also, the synthesized composite was trapped in a cellulose acetate membrane filter. The removal occurred in 3–5 s by using a syringe filter system. 97.9% for Cd²⁺, 95.7% for Cr³⁺ and 99.8% for Pb²⁺ removal rates were obtained in the experiment using 2.5 ppm of Cd²⁺, Cr³⁺, Pb²⁺ added to tap water at pH 6. The synthesized composite was characterized by Fourier Transform Infrared. The metal ion concentrations were measured by ICP-OES. The effects of pH, interaction time, shaking speed, ambient temperature, initial metal ion concentration, and amount of composite were also investigated. The reached removal percentage was 100% for Cd²⁺, Cr³⁺, Pb²⁺ under optimal conditions by using 0.25 g of composite in batch mode. The used initial metal ion concentration was 2.5 mg/L.

中文翻译：

---

聚合物/ Fe 3 O 4复合材料快速去除Cd 2+，Pb 2+和Cr 3+

通过自由基聚合合成聚合物/ Fe ₃ O ₄复合材料。丙烯酰胺用作单体，并在Fe ₃ O ₄颗粒存在下与1,3,5-三丙烯酰基六氢-1,3,5-三嗪共聚。所获得的聚合物被N，N，N′，N′-四甲基乙二胺水解以增加离子化基团的量。将干燥且粉末状的复合材料用于分批去除Cd 2 ⁺，Pb ²⁺和Cr ³⁺。另外，将合成的复合物捕获在乙酸纤维素膜过滤器中。使用针筒式过滤器系统在3到5 s内即可完成清除。Cd ²⁺为97.9％，Cr ³⁺为95.7 ％，Pb ²⁺为99.8％在pH为6的自来水中添加2.5 ppm的Cd 2 ⁺，Cr ³⁺，Pb ²⁺可获得实验中的去除率。合成的复合材料通过傅里叶变换红外光谱进行表征。通过ICP-OES测量金属离子浓度。还研究了pH，相互作用时间，振荡速度，环境温度，初始金属离子浓度和复合物含量的影响。在最佳条件下，通过以分批方式使用0.25 g复合^材料，Cd 2 ⁺，Cr ³⁺和Pb ^2+的去除率达到100％。所用的初始金属离子浓度为2.5mg / L。