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

Enzymes are most often used for H2O2 sensing and, horseradish peroxidase (HRP) is the most commonly used enzyme1 because it offers high sensitivity, selectivity, and faster response. However, the variation of solution pH and ionic strength, temperature, and exposure to light could cause irreversible loss of its activity. Immobilized HRP loses 60% of its initial activity with the variation of 4 units of pH (8 to 4) and, this loss could be up to 30% with the change of temperature from 40 to 20 °C.
So, an increasing amount of interest from various research groups has resulted in the acceleration of progress of design of enzyme-free sensors. Towards this goal, simple voltammetric, impedance, and amperometric methods have been developed for H2O2 electrochemical sensing. At the early stage of development, high overpotential of the redox couple reactions and slow kinetics of electron transfer were the main drawback of this technique. These limitations are overcome in many extents with the development of nanomaterials. The current research on H2O2 sensing is intensified towards the electrode modifications for the reduction of overpotential and faster electron transport, but the sensitivity of the electrode needs to be improved so that H2O2 can be detected at a lower concentration with a tiny electrode.
This work develops a green route for synthesis of various metal oxides and uses as electrocatalysts for H2O2 formation and sensing (Figures 1 and 2) (catalysts name withheld).

2Electrocatalytic CO2 conversion to value chemicals

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