•Fe(VI) improved removing GSM and 2-MIB.•The effect of pH was compared.•These removal process of two substance by Fe(VI) were compared.Geosmin (GSM) and 2-methylisoborneol (2-MIB) are the most common naturally occurring taste and odor compounds in water supplies. Conventional approaches for water treatment exhibit some benefits. However, those protocols are generally ineffective for the elimination of the two compounds. In this paper, an approach on removal of GSM and 2-MIB using K2FeO4 was explored. Detailed methodology was developed. GG-MS was employed to identify the GSM and 2-MIB compounds. Further, the parameters influencing the effect of GSM and 2-MIB removal, such as pH and K2FeO4 amount were evaluated. At pH of 9, GSM and 2-MIB received its maximum value (22.5%, 31.9%). When dealing with both substances simultaneously, K2FeO4 exhibited obvious effects on MIB. More importantly, K2FeO4 can control the production rate of MIB in algae.

A novel and label-free gold nanorods (GNRs)-based resonance light scattering system assay has been developed on the basis of that the interactions between microalgae proteins and GNRs could emit strong fluorescence signal. We have prepared GNRs which were well dispersed in the solution and the microalgae protein was absorbed onto the surface of GNRs. The results demonstrated that the intensity of fluorescence has correlation with the protein concentration. The optimum pH was 5.5 and the optimum concentration of inorganic salt ions Na+ was 0.5 mol L−1; the stable time of the reaction system was 2 min. Because of the protein molecules are firmly combined with the surface of the gold particles, a protein layer is formed to prevent the aggregation of gold nanoparticles. Gold nanoparticles have a strong adsorption to proteins and other biological macromolecules and will not change their biological activity, hence it provides a number of advantages. This method offers the advantages of higher sensitivity and selectivity in microalgae protein detection and providing great potential for biology diagnosis.

A novel and label-free gold nanorods (GNRs)-based resonance light scattering system assay has been developed on the basis of that the interactions between microalgae proteins and GNRs could emit strong fluorescence signal. We have prepared GNRs which were well dispersed in the solution and the microalgae protein was absorbed onto the surface of GNRs. The results demonstrated that the intensity of fluorescence has correlation with the protein concentration. The optimum pH was 5.5 and the optimum concentration of inorganic salt ions Na+ was 0.5 mol L−1; the stable time of the reaction system was 2 min. Because of the protein molecules are firmly combined with the surface of the gold particles, a protein layer is formed to prevent the aggregation of gold nanoparticles. Gold nanoparticles have a strong adsorption to proteins and other biological macromolecules and will not change their biological activity, hence it provides a number of advantages. This method offers the advantages of higher sensitivity and selectivity in microalgae protein detection and providing great potential for biology diagnosis.

Cyanobacterial blooms generated by nutrient addition into aquatic systems pose serious risks to ecosystems and human health. Though there are established chemical, physical, and biological means of eradication, more efficient and environmentally friendly measures are desired. This study investigates the effect of potassium ferrate(VI) on the growth and intracellular and extracellular organic matter accumulations of the cyanobacterium Microcystis aeruginosa. Cultures were inoculated with three separate concentrations of potassium ferrate(VI) (3, 15, 30 mg L−1) and monitored by measuring chlorophyll-a (Chl-a) and intracellular/extracellular dissolved organic carbon. Results show that ferrate(VI) addition effectively removed the microalgae from the medium, as indicated by the reduction of Chl-a. Organic matter accumulation of the microalgae was also affected by ferrate(VI) treatment; fluorescence EEM spectra show details of changing intracellular dissolved organic matter (IDOM) and extracellular dissolved organic matter (EDOM). A new peak appeared in the EDOM indicating altered humic and proteinaceous compounds. This study demonstrates that ferrate(VI) is a potential treatment for the water contaminated with the toxic microalgae M. aeruginosa.