Nowadays, the treatment of dye-contaminated wastewater is a great concern, due to environmental pollution and dyes’s harmful effects on public health. Biosorption of toxic dyes on the waste hop biomass proved an effective method to minimize the harmful effects of dye-contaminated wastewater on the ecological environment and human health. The main goal of this study was to evaluate the influence of particle size of waste hop-based biosorbent on the removal efficiency of malachite green (MG), methylene blue (MB), and crystal violet (CV) from an aqueous solution in a batch system. Four fractions of waste hop biomass (with a particle size of 1.03, 0.85, 0.519, <0.519 µm), were tested as biosorbents. Waste hop biosorbent showed great potential in removing the tested dyes with a removal efficiency that reached as high as 98.4 (MG), 98.8 (MB), and 98.5% (CV) for the smallest fraction used with a particle size smaller than 0.519 µm. The results also revealed that the efficiency of dye removal decreases with the increase in fractions particle size, thus for the largest particle size, it was 79.7, 81.3, and 80.1 % for MG, MB, and CV removal, respectively. The utilized fractions of biosorbent were proved to be an efficient natural material, which is also cheap and environmentally friendly, and its use is highly desirable considering that such biosorption reduces the costs of total wastewater treatment.
Perendija et al. (Mon,) studied this question.