Huidi Zhang,Yao Deng,Junhui Yang,Jinglin Yin,Jing Wang,Hongbo Xiao,Lizhi Wang,Cuihong Zhang,Wenlei Wang
In this study, MnPc intercalated Zn/Fe layered double hydroxides (MnPc/ZF−LDH) were synthesized by pillared intercalation modification with different MnPc intercalation amounts and used for the selective transformation and removal of As(III) from the arsenate-phosphate mixed solution. Fe−N bonds were constructed by the complexation of MnPc and iron ions on the Zn/Fe layered double hydroxides (ZF−LDH) interface. The DFT calculation results show that the binding energy of Fe−N bonded to arsenite (−3.75 eV) was higher than that of phosphate (−3.16 eV), resulting in MnPc/ZnFe−LDH exhibiting high As(III) selective adsorption performance and anchoring it rapidly in the arsenite -phosphate mixed solution. The maximum adsorption capacity of 1MnPc/ZF−LDH for As(III) could reach 180.7 mg·g −1 under dark conditions. MnPc also acts as a photosensitizer to provide more active species for the photocatalytic reaction. A series of experiments demonstrated that MnPc/ZF−LDH exhibits high As(III) selective photocatalytic performance. A total of 10 mg·L −1 of As(III) was completely removed in the reaction system within 50 min in a single As(III) environment. In an environment with As(III) and PO 4 3− , it achieved 80.0 % removal efficiency of As(III) and showed a good reuse effect. The introduction of MnPc could improve the utilization of visible light by the MnPc/ZnFe−LDH. The singlet oxygen generated from photoexciting MnPc leads to abundant ZnFe−LDH interface OH. In addition, MnPc/ZnFe−LDH shows good recyclability , making it a promising multifunctional material for the purification of arsenic-polluted sewage.
Yijing Ai,Fan Shi,Xiao Han,Xiaoqing Li,Wanting Fu,Baoli Wang,Xiaoping Zhang,Wei Sun
In this work, a simple one-step pyrolysis process was designed to synthesize Fe-doped graphite carbon nitride (Fe–C 3 N 4 ) nanosheets with FeCl 3 as Fe source. The resulted samples were characterized by various characterization techniques, and the results showed that Fe species might form Fe–N bonds with N atoms of C 3 N 4 , which was similar to the iron (Ⅲ) porphyrin active center of horseradish peroxidase. Then Fe–C 3 N 4 nanosheet was further mixed with carbon nanotube (CNT) to obtain Fe–C 3 N 4 @CNT nanocomposite, which was further modified on the self-made flexible printed electrode (PE) to construct the flexible working electrode. Fe–C 3 N 4 nanosheets show good catalytic activity for H 2 O 2 and the introduction of CNT can effectively improve the electron transfer efficiency at the modified electrode interface. By combining with wireless portable electrochemical workstation, the sensor shows a wider detection range (10.0 μmol/L–20.0 mmol/L) and a lower limit of detection (0.38 μmol/L, S/N = 3) for the H 2 O 2 analysis. Furthermore, the sensor can be applied to the real time and in-situ analysis of H 2 O 2 secreted from live cells. In word, this self-supported sensing electrode shows great potential applications in monitoring the pathological and physiological dynamics of cancer cells.
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