This paper investigates the adsorption performance of spent tea leaves (STL) modified with
polyethylenimine (PEI) on two anionic dyes, namely Reactive Black 5 (RB5) and Methyl …

The removal of azo dye from wastewater is urgent due to its massive discharge from various
industries and high toxicity. Adsorption is an efficient removal method, but it is limited by the …

Hydrogen energy, with environment amicable, renewable, efficiency, and cost-effective
advantages, is the future mainstream substitution of fossil-based fuel. However, the …

The hydrogen economy is an envisaged system proposed for a sustainable energy future
that comprises hydrogen production, storage, transportation, and stationary/mobile …

Adsorption is an important process in wastewater treatment, and conversion of waste
materials to adsorbent offers a solution to high material cost related to the use of commercial …

Activated carbons (ACs) from biomass sources have attracted attention due to their superior
properties including, easy preparation, abundant raw materials, ready availability, low cost …