## 1 Introduction
[20] manufactured a 3D-printed interfacial evaporator and achieved an efficiency of 94.4%; the 3D-printed evaporator with a tall cone structure could evaporate water at a rate of 1.96 kg m\({}^{-2}\) h\({}^{-1}\). [PERSON] et al. [21] utilized the oxidation process to develop metal-organic framework materials such as nanorods for interfacial solar evaporation and reported a 2.25 kg m\({}^{-2}\) h\({}^{-1}\) evaporation rate. [PERSON] et al. [22] developed inexpensive, mass-produced xerogel foam for the production of thermoelectric power and photothermal water desalination and recorded an average daily production of 8.9 kg m\({}^{2}\) and a maximum water collection rate of 1.2 kg m\({}^{-2}\) h\({}^{-1}\) in outdoor experiments. The recent literature above utilized magnets, charcoal, fins, evaporators such as melanin-inspired aerogels, antibacterial membranes, foams, 3D-printed nanostructures, nanocoatings, and PVA sponges as substances for storing energy to enhance the distillate yield of solar stills. Slowly, researchers are focusing on utilizing natural materials in solar stills as energy absorption materials due to them being cost effective and environmentally viable. [PERSON] and [PERSON] [23], who improved the condensation and evaporation rates of pure water via utilizing natural fibers and energy storage, achieved 126% distillate yield enhancement. [PERSON] and [PERSON] [24] utilized Luffa acutangula fiber in a solar still and enhanced the yield by 4.09%, 16.64%, 22.69%, 22.04%, 17.45% and 12.27% with 25, 20, 16, 14, 13, and 10 fibers in the absorber basin in contrast to a traditional solar still. [PERSON] et al. [25] investigated the natural signal fiber's effect on a solar still'scondensation rate and improved the distillate output by 19.1% in contrast to a traditional still. [PERSON] et al. [26] evaluated a single slope still's performance by utilizing ridge gourd natural fiber and concluded that the 0.6 m\({}^{2}\) absorber basin produced 1550 mL using the system without fibers, whereas the solar still using the ridge gourd fiber produced 1500 mL. [PERSON] et al. [27] employed pond fibers to increase the performance of a single slope still and the results disclosed that the solar still with five dried pond fibers increased freshwater production by 29.67%. So far, researchers have utilized ridge gourd, pond, Luffa actunagula, sisal, and natural fibers to improve the performance of solar stills. In this work, banana stems were utilized as a biowaste for harvesting solar energy. The pros and cons of the pseudo stem are as follows: the banana stem has a good capillarity and floating nature, which is viable for interfacial solar desalination. Furthermore, utilizing banana stem biowaste is cost-effective and eco-friendly. However, the life span of these stems is limited due to the continuous exposure to solar irradiation over a period of time. A pseudo stem was soothed with camphor to absorb solar energy. The banana stems were placed in a solar still to capture thermal energy from the sun and transfer it to the surrounding water to improve the evaporation rate in order to obtain more freshwater. Studies were carried out over three days by varying the thickness of the banana stems such as 0.5 cm, 1 cm, and 1.5 cm and keeping the depth of water constant (1 cm). The results revealed that the banana stems with a 0.5 cm thickness performed better in contrast to those that were 1 cm and 1.5 cm thick. Furthermore, a water quality analysis was also carried out to make sure that the pure water did not contain any kinds of harmful pathogens and the results were compared to the standard limits provided by the WHO and the BIS. Moreover, enviro-economic investigations have disclosed that desalination has 2.09 tonnes of CO\({}_{2}\) mitigation for 10 years of life.