Monodispersed magnetic sorbents (MMSs) display great potential for adsorptive removal of pollutants, but the conventional methods cannot meet requirements of scalable, time-saving, and energy-efficient fabrication. In this work, space-confined synthesis of nitrilotriacetic acid immobilized magnetic sorbents (NAIMSs-E) in aqueous continuous phase of high internal phase emulsions (HIPEs) was conducted, and as-prepared high quality sorbents (sensitive response to magnetic field, abundant affinity groups, uniform shell size, and stable structure) were applied for removing bivalent cadmium (Cd²⁺) from aqueous solutions. 2-(Bis-carboxymethyl-amino)-6-{3-[2-(3,4-dihydroxy-phenyl)-ethylcarbamoyl]-propionylamino}-hexanoic acid was firstly synthesized as a robust anchor and a functional modifier onto magnetic Fe₃O₄. The effects of synthesis conditions to the morphology and structure were studied, and the forming mechanism based on emulsion nano-reactor was demonstrated. NAIMSs-E are expected to possess fast equilibrium rate, and approximately 90% of the maximum adsorption capacity is achieved within 60 min. The maximum uptake amounts are 49.98 mg g^-1, 80.58 mg g^-1, 176.4 mg g^-1 at 288 K, 298 K, and 308 K, respectively, and the monolayer chemisorption based on sharing and transferring of electrons is the main rate-limiting step. Moreover, NAIMSs-E have excellent regeneration and specific affinity towards Cd²⁺, even for actual water samples. In addition, the spontaneous, endothermic, and entropy increased adsorption process is also confirmed. Therefore, this work not only presents a new clue to fabricate MMSs via simple emulsion nano-reactor, but also provides a novel platform for Cd²⁺ removal.

单分散磁性吸附剂（MMS）具有吸附去除污染物的巨大潜力，但是常规方法不能满足可扩展，省时和节能的要求。在这项工作中，在高内相乳液（HIPEs）的水连续相中进行了空间限制的次氮基三乙酸固定磁吸附剂（NAIMSs-E）的合成，并制备了高质量的吸附剂（对磁场敏感，亲和力强。组，均匀的壳尺寸和稳定的结构）用于从水溶液中去除二价镉（Cd ²⁺）。首先合成2-（双-羧甲基-氨基）-6- {3- [2-（3,4-二羟基-苯基）-乙基氨基甲酰基]-丙酰基氨基}-己酸作为磁性铁上的稳固锚和功能改性剂₃ O ₄。研究了合成条件对形貌和结构的影响，并阐明了基于乳液纳米反应器的形成机理。预期NAIMSs-E具有快速的平衡速率，并且在60分钟内可达到最大吸附容量的90％。最大摄取量为49.98毫克克^-1，80.58毫克克^-1，176.4毫克克^-1在288 K，298 K，和308 K，分别与化学吸附单层基于共享和电子的传输是主速率-限制步骤。此外，NAIMSs-E对Cd ²⁺具有极好的再生和特异性亲和力，甚至用于实际的水样本。另外，还证实了自发的，吸热的和熵增加的吸附过程。因此，这项工作不仅为通过简单的乳液纳米反应器制备MMS提供了新的思路，而且为Cd ^2+的去除提供了新的平台。