MoS2-decorated CdS nanorods for efficient photocatalytic degradation of organic pollutants

Abstract

Utilizing heterojunctions to their full potential represents a critical approach to addressing environmental pollution, though enhancing photocatalytic performance through this strategy remains challenging. In this study, MoS2-modified CdS heterojunction was synthesized via a hydrothermal method and served as an efficient photocatalyst for the degradation of organic pollutants. The composite was systematically characterized, and its photocatalytic activity was evaluated using organic dye Rhodamine B (RhB) and the pesticide nitenpyram (NTP) as model pollutants. Results demonstrated a significant enhancement in photocatalytic efficiency for the MoS2/CdS composite compared to pure CdS. Among the tested materials, the composite labeled MC4 exhibited the highest performance, achieving degradation rates of 90% for RhB and 89% for NTP within 90 minutes—corresponding to rate constants 4.4 and 2.9 times greater than those of pure CdS. Moreover, MC4 maintained high stability and catalytic activity over five cycling experiments. This work presents a low-cost and environmentally friendly route for synthesizing MoS2/CdS composites, compliant with global demand for green and sustainable environmental solutions.