Hierarchically mesoporous adsorbent derived from natural hydromagnesite with remarkable adsorption capacity for fluoride (F⁻) has been synthesized through the facile one-step calcination. Various characterizations confirmed that calcination temperature was directly correlated with their crystallite structures, surface properties, and adsorb ability. The hydromagnesite calcined at 500 °C (CH-5) exhibits the highest adsorption capacity and rate towards F⁻. The F⁻ adsorption isotherm data was explored by both Langmuir and Freundlich model and the maximum adsorption capacity of CH-5 was 69.6 mg/g. Kinetic study revealed that the adsorption kinetics follows the pseudo-second-order model, suggesting the chemisorption mechanism. Regeneration study showed that the adsorption ability for fluorine can be completely recovered by calcining at 500 °C, and after five cycles, the adsorption ability is not significantly weakened. After detailed evaluation, the enhancement mechanism of the calcined product can be attributed to relatively higher specific surface area and exposed more magnesite active sites due to the maintenance of the intrinsic three-dimensional layer structure during the dehydration and decarbonation, which were responsible for the striking adsorption abilities. The green adsorbent originated from natural mineral with the characteristics of low cost, high adsorption ability and recoverability is advantageous for fluoride-containing wastewater treatment.

分层介孔吸附剂从具有显着的吸附容量为氟（F天然水菱镁矿衍生^-已经通过简便一步法煅烧合成）。各种特征证实煅烧温度与其微晶结构，表面性质和吸附能力直接相关。水菱镁矿煅烧在500℃（CH-5）表现出朝向F中的最高吸附容量和速率^- 。在F ^-Langmuir和Freundlich模型均研究了吸附等温线数据，CH-5的最大吸附容量为69.6 mg / g。动力学研究表明，吸附动力学遵循拟二级模型，表明了化学吸附机理。再生研究表明，在500°C下煅烧可以完全恢复对氟的吸附能力，并且经过5个循环后，吸附能力并未显着减弱。经过详细评估，煅烧产物的增强机理可归因于较高的比表面积，并且由于在脱水和脱碳过程中维持了固有的三维层结构，暴露了更多的菱镁矿活性位点，这是造成撞击的原因。吸附能力。