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An integrated 1D/0D/1D hybrid nanomaterial was prepared from MWCNT supported carbon quantum dots @ MnO 2 nanomaterial for a sensitive and selective electrochemical heavy metal ion sensor by hydrothermal methods. The developed nanomaterials were characterized by various analytical methods such as FESEM, HRTEM, XRD, FTIR, EDX and elemental mapping study, and also its electrochemical properties of the prepared samples were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis. Differential pulse voltammetry (DPV) analysis has been used to investigate the quantitative detection of heavy metal ions such as cadmium and chromium on modified electrodes under optimal conditions. The in-situ electrochemical sensitivity and selectivity of the samples were determined by varying various parameters, such as the concentration of heavy metal ions, different electrolytes and electrolyte pH. The observed DPV results show that prepared MWCNT (0.05 wt%) and CQD (0.1 wt%) supported MnO 2 nanoparticles show effective detection response for chromium (IV) metal ion. In particular, 0D CQD, 1D MWCNT, and MnO 2 hybrid nanostructures produced a synergistic effect among them, resulting in strong electrochemical performance of the prepared samples against the target metal ions., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Inc. All rights reserved.)

Effective improvement of an easily recoverable photocatalyst is equally vital to its photocatalytic performance from a practical application view. The magnetically recoverable process is one of the easiest ways, provided the photocatalyst is magnetically strong enough to respond to an external magnetic field. Herein, we prepared graphitic carbon nitride nanosheet (g-C 3 N 4 ), and ZnS quantum dots (QDs) supported ferromagnetic CoFe 2 O 4 nanoparticles (NPs) as the gC 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid photocatalyst by a wet-impregnation method. The loading of CoFe 2 O 4 NPs in the g-C 3 N 4 /ZnS nanohybrid resulted in extended visible light absorption. The ferromagnetic g-C 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid exhibited better visible-light-active photocatalytic performance (97.11%) against methylene blue (MB) dye, and it was easily separable from the aqueous solution by an external bar magnet. The g-C 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid displayed excellent photostability and reusability after five consecutive cycles. The favourable band alignment and availability of a large number of active sites affected the better charge separation and enhanced photocatalytic response. The role of active species involved in the degradation of MB dye during photocatalyst by g-C 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid was also investigated. Overall, this study provides a facile method for design eco-friendly and promising g-C 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid photocatalyst as applicable in the eco-friendly dye degradation process., (Copyright © 2021 Elsevier Inc. All rights reserved.)

In this study, 2D/2D/2D heterostructured r-GO/LTH/ZnO/g-C 3 N 4 nanohybrid were synthesized through hydrothermal method. The strong electrostatic interaction between the negatively charged g-C 3 N 4 and r-GO nanosheets with positively charged layered triple hydroxide (LTH) nanosheets are effectively influences the successful formation of heterojunction. The LTH nanosheets are well spread on the g-C 3 N 4 nanosheets combined with r-GO. In particular, the as prepared heterojunction shows a better photocatalytic degradation activity compared to pristine samples and the significant enhancement in the photocatalytic performance is mainly accredited to the large interfacial charge transition of photogenerated charge carriers under the visible light irradiation. Although the 2D/2D/2D heterojunction effectively hinders the charge carrier recombination resulting high photocatalytic activity with good stability. In addition, the r-GO supported LTH/ZnO/g-C 3 N 4 heterojunction shows high photo-stability after sequential experimental runs with no obvious change in the dye degradation process. Consequently, the role of active species was investigated over the r-GO/LTH/ZnO/g-C 3 N 4 heterojunction with the help of different scavengers., (Copyright © 2021 Elsevier Inc. All rights reserved.)