Daokui Li,Yili Tang,Xiaochao Zuo,Xiaoguang Zhao,Kaixuan Shang,Huaming Yang
Energy storage materials show enormous potential for the development of energy-saving buildings. However, high-performance composite phase-change materials (PCMs) usually exhibit complex and low photothermal conversion efficiencies. This significantly hinders their application in the construction field. Herein, we reported an effective strategy to construct attapulgite, expanded perlite, and graphite (AEG) ternary composite mineral microspheres through spray drying. Supporting materials were selected to integrate the unique advantages of the materials and achieve a functional design with synergistic benefits. Paraffin–AEG (P-AEG) composite PCMs with light-to-heat conversion and thermal energy storage functions were fabricated via vacuum impregnation. The prepared P-AEG exhibited an excellent light–thermal conversion capability, with a conversion efficiency as high as 92%. In addition, the thermal energy storage building materials constructed with the P-AEG composite PCMs and concrete (P-AEG-C) exhibited exceptional thermal management abilities. At the peak position in the heating stage and the bottom position in the cooling stage, the temperature of the P-AEG-C was 3.9 °C lower and 7.5 °C higher than that of concrete, respectively. The P-AEG-C exhibited excellent mechanical properties with a compressive strength of 14.8 MPa, and thus, it has enormous potential in light–thermal conversion applications and energy-saving buildings.
Zi-ling Li,Yi-dan Wei,Jia-ning Wei,Ke-yan Chen,Yu He,Man-man Wang
A novel monodispersed CaCO 3 @hydroxyapatite/magnetite microsphere (CaCO 3 @HAP/Fe 3 O 4 ) was prepared via an in-situ growth strategy, and applied as an adsorbent for efficient and selective adsorption of benzoylurea insecticides (BUs) in various tea beverages samples. The sorbent exhibited uniformity in particle size, good mono-dispersibility and excellent solvent stability. The adsorption equilibrium of BUs (100 ng/mL) in 10 mL of tea beverages samples was achieved on 20 mg of CaCO 3 @HAP/Fe 3 O 4 within 10 min. The adsorption followed pseudo-second-order kinetics and Langmuir models and the maximum adsorption capacities of 131.9–161.3 mg/g were accomplished via hydrophobic interactions, hydrogen bonding, and the affinity of F atom and Ca 2+ . Coupled with high performance liquid chromatography , the method offered wide linear ranges of 0.8–1000 ng/mL with correlation coefficients ( r ) ≥ 0.9995, low limits of detection of 0.2–0.3 ng/mL and large enrichment factors of 75.7–102. The recoveries ranged from 75.7%− 102% with intra- and inter-day precisions of 1.9%− 9.3% and 1.6%− 11.8%, respectively. In addition, CaCO 3 @HAP/Fe 3 O 4 could be easily regenerated and reused at least 10 times with no significant loss of recovery. These results revealed an alternative strategy for fast and convenient determination of BUs in tea beverages samples and proved the great feasibility of CaCO 3 @HAP/Fe 3 O 4 in the application for the selective adsorption of BUs.
危险品化学品经营许可证（带存储）