Magnetic and thermal dual-sensitive core-shell nanoparticles for highly preconcentration and measurement of Sudan red pollutants

Challenges in Environmental Science/Engineering and fate and innovative treatment/remediation of emerging pollutants

Solid waste Management: There are two articles in this section. Shi et al. (2021) investigated the unbalanced status and multidimensional influences of municipal solid waste management in Africa. It was identified that economic growth, urbanization and geographical location are the most critical factors influencing the unbalanced statue of MSW management in Africa.

A simple sensing platform based on a 1T@2H-MoS2/cMWCNTs composite modified electrode for ultrasensitive detection of illegal Sudan I dye in food samples

The work presented here describes a highly sensitive and simple electrochemical sensor for the detection of Sudan I dye based on a nanocomposite made of MoS₂ heterogeneous nanosheets (1T@2H-MoS₂) and carboxylated carbon nanotubes (cMWCNTs) (1T@2H-MoS₂/cMWCNTs). XPS results indicate that the content of 1T phase MoS₂ was estimated to be 72% in 1T@2H-MoS₂. Electron microscopy results show that the tubular cMWCNTs are uniformly interwoven in MoS₂ nanosheets to form a three-dimensional network structure. Due to the synergistic electrocatalytic ability and high electroactive surface area, the 1T@2H-MoS₂/cMWCNTs modified electrode demonstrated excellent analytical performance for Sudan I, including simple operation, good stability and a wide linear range from 5.00 × 10^-9 to 2.00 × 10^-6 mol L^-1 and 2.00 × 10^-6 to 1.00 × 10^-4 mol L^-1 with an ultra-low detection limit of 1.56 × 10^-9 mol L^-1. The recoveries of Sudan I from spiked real samples (chilli powder and ketchup) were in the range of 95.60% to 106.10% with low RSD (<5%), indicating that the 1T@2H-MoS₂/cMWCNTs modified electrode is a promising tool for the analysis of illegal Sudan I in food samples.