An efficient magnetic mesoporous structure was designed and prepared for the facile pre-concentration of As(III) ions. To prepare the sorbent, core–shell magnetic silica nanoparticles were covered by MCM-41 like structure and then the surface was modified by guanidine via an amine linker (GA-MSMP). The prepared adsorbent was investigated as an effective and sensitive material for the adsorption of arsenic ions from the aqueous solution by applying a normal batch method. The imperative variables of the adsorption were studied to increase efficiency. The dynamic and static processes were tested that matched a pseudo-second-order of kinetic model and the Langmuir isotherm model, respectively. The sorbent reusability was investigated and it was confirmed that the designed product could be applied at best for six cycles successively without any significant efficiency losing. The synthesized product was tested to determine and pre-concentrate trace amounts of arsenic ions in rice and natural waters as a real sample. A desorption process applying 5 mL of hydrochloric acid (0.5 mol L⁻¹) as an eluent, exhibited about 98% recovery of the As(III) ions adsorbed on the GA-MSMP sorbent. The maximum adsorption capacity of the GA-MSMP was calculated to be 312 mg g⁻¹ for adsorption of As(III) under the optimal conditions.

设计并制备了一种有效的磁介孔结构，用于As（III）离子的便捷预富集。为了制备吸附剂，将核-壳型磁性二氧化硅纳米粒子用MCM-41状结构覆盖，然后通过胍通过胺连接剂（GA-MSMP）对表面进行修饰。通过应用常规分批方法，研究了所制备的吸附剂作为一种有效和敏感的材料，用于从水溶液中吸附砷离子。研究了吸附的命令性变量以提高效率。测试了分别与伪二级动力学模型和Langmuir等温线模型匹配的动态和静态过程。研究了吸附剂的可重复使用性，并确认设计的产品最多可连续应用六个循环，而不会损失任何效率。测试了合成产物，以确定并预浓缩了稻米和天然水中的痕量砷离子（作为真实样品）。使用5 mL盐酸（0.5 mol L^-1）作为洗脱液，吸附在GA-MSMP吸附剂上的As（III）离子的回收率约为98％。在最佳条件下，GA-MSMP的最大吸附容量为312 mg g ^-1，以吸附As（III）。