TThe goal of the present study was the preparation of bacterial cellulose-charcoal composite gels for the adsorption of arsenic and methylene blue. A bacterial cellulose gel was produced from a high-performance strain of Komagataeibacter intermedius BE073. The bacterial cellulose-charcoal gels (BC-C gels) were successfully prepared by in situ method. Charcoal at concentrations of 0.005 – 1.50 % (w/v) was used to prepare the BC-C gels, and the efficiency of BC-C gels for arsenic and methylene blue adsorption was investigated. The results showed that BC-C gels could retain charcoal, and the FTIR signal followed the increasing charcoal content, indicating the adhesion of charcoal powder within the bacterial cellulose structure. For arsenic adsorption, the 0.05% charcoal concentration showed the highest binding value (~3, 200 mg/kg), significantly higher than other conditions, possibly due to the opening of the pore structure and the increase in suitable charcoal surface adhesion sites. In term of methylene blue adsorption, the gels containing 0.05 to 0.10%charcoal showed the highest efficiency, with adsorption per gram of gel (qt) increasing with the initial methylene blue concentration. While increasing the gel mass increased the removal percentage, the qt value decreased at the equilibrium of the adsorption system. The results confirmed that BC-C gels can be produced using an environmentally friendly synthetic process, thereby reducing chemical use and providing significant adsorption capacity for both arsenic and methylene blue, with an optimum carbon addition level of 0.05 – 0.10%. The findings indicate the potential of this new adsorbent material for wastewater treatment applications, addressing sustainable technology and supporting the Sustainable Development Goals (SDGs) of clean water, health, and the environment.