Silica 6 Sol-gel 6 Sol-gel process 6 Sol-gels 6 article 6 priority journal 6 silicon dioxide Algae 4 Chlamydomonas reinhardtii 4 Chlorella vulgaris 4 Micro-algae 4 Microalgae 4 Microorganisms 4 Pseudokirchneriella subcapitata 4 Selenastrum capricornutum 4 adsorption 4 alginic acid 4 chemistry 4 hydrogel 4 isotherm 4 microalga 4 nonhuman 4 silica gel 4 synthesis 4 Adsorption 2 Adsorption properties 2 Alginates 2 Anionic and cationic dyes 2 Article 2 Biosensing Techniques 2