Photocatalysis and nanoparticles:
1. Bio-mediated route of metal doping: A breakthrough
2. Metal nanoparticles synthesis and antimicrobial functionalities
1. Electrocatalytic H2O2 formation and sensing
2. Electrocatalytic CO2 conversion to value chemicals

CO2 constitutes about 0.03% of the atmospheric gases. It is considered as one of the significant greenhouses resulted mostly from the anthropogenic activities. Electrochemical reductions (ECR) of CO2 assistances in CO2 utilization and, the reaction products usually have high calorific values. The heterogeneous catalysts such as metal complexes and metal derivatives are found to be the most efficient for the cleavage of the C-O bond of CO2. The activation of CO2 requires the change in its geometry from the linear CO2 to bent CO2 anion radical (•CO2−), which results in a very slow self-exchange rate for the CO2/•CO2− couple. This is the most energy-intensive step in ECR of CO2 and theoretically, it requires -1.9 V vs. SHE. The minimization of hydrogen evolution at a higher electrode potential by water splitting is also a challenge of a typical ECR process. 
Here, we synthesize a new class of salen ligand complexes which can reduce CO2 at a lower overpotential. The metal is reduced to its oxidation state I and form a complex with •CO2-radical and, the metal again backs to its previous oxidation state II. The pictorial views of synthesized Ni and Cu complexes are in Figure 3 below (details withheld). 

Figure 3. Synthesized salen ligand complexes of Ni and Cu. 

Physiochemical and biochemical processes
1. Heavy metal remediation using functionalized adsorbent and bio-resin
2. Spirulina platensis: A potential scavenger of chromium from wastewater
Advanced oxidation processes (AOPs)
1. Impact of iron chelation on PhACs decomposition in AOPs