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

The common techniques of metal NPs synthesis include sol-gel method, chemical spray pyrolysis, solvo-/hydrothermal method, thermal decomposition method, co-precipitation, and sonochemical. They are mostly energy intensive and involve the use of hazardous and costly chemicals.
However, a bio-mediated process eliminates the use of costly and hazardous chemicals where the reactions are carried out either in an aqueous or organic phase by extracting the analytes such as ascorbic acid, amino acids, and polyphenols from the living cells. These analytes are used both as the reducing and stabilizing compounds to minimize particle agglomeration. NPs are usually poly-dispersed in nature but with a low polydispersity index (0.1 to 0.3). Moreover, the size of NPs (13 to 355 nm) can be precisely controlled by simply tuning the synthesis condition such as proton concentration with a little amount of capping agent binding on it (14- 20 % loss by thermogravimetric analysis between 100 and 400 °C).
Intercellular synthesis of nanoparticles using microbes often shows a lower synthesis rate as well as difficulty in size and shape control. The primary aim of this work is to precisely control the shape and size of metal NPs (glimpse in Figure 2) and to synthesis of tailor made nanostructures for target specific applications. 
                          
Figure 2.  Size control of AgNPs by tuning proton concentration. 

Electrocatalysis 
1. Electrocatalytic H2O2 formation and sensing
2. Electrocatalytic CO2 conversion to value chemicals
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