We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Impact of different environmental particles on degradation of dibutyl phthalate in coastal sediments with and without Cylindrotheca closterium
Summary
Researchers compared the effects of biochar, carbon nanotubes, zero-valent iron nanoparticles, and polyethylene microplastics on the biodegradation of the plasticizer dibutyl phthalate in marine sediments, finding that microplastics and other particles reduced degradation by sequestering the contaminant, while the diatom Cylindrotheca closterium partially offset these inhibitory effects.
This study investigated the impact of different environmental particles at different concentrations (0.2% and 2%, w/w) on biodegradation of dibutyl phthalate (DBP) in sediments with and without Cylindrotheca closterium, a marine benthic diatom. The particles included biochar pyrolyzed at 400 °C, multi-walled carbon nanotube (MWNT), nanoscale zero-valent iron (nZVI) and polyethylene microplastic. In treatments without C. closterium, inhibition effect of the particles on degradation percentage of DBP (up to 15.7% decrement except 1.7% increment for 0.2% nZVI) increased with the increase of particle sorption ability to DBP and particle concentration in general. The results of 16s rDNA sequencing showed that C. closterium was probably the most abundant DBP-degrader, accounting for 20.0-49.3% of the total taxon read numbers. In treatments with C. closterium, inoculation of C. closterium increased the degradation percentage of DBP in all treatments with particle addition by 0.0-11.3%, which increased with the increase of chlorophyll a content in general but decreased with the increase of particle concentration from 0.2% to 2%. The increment was the highest for treatment with 0.2% nZVI addition due to its highest promotion effect on algal growth. In contrast, the increment was the lowest for treatments with MWNT addition due to its strong sorption to DBP and strong inhibition on the growth of C. closterium. Our findings suggested that the environmental particles could influence bioavailability of DBP by sorption and biomass of C. closterium, and thus degradation of DBP in sediments.
Sign in to start a discussion.
More Papers Like This
Impact of microplastic addition on degradation of dibutyl phthalate in offshore sediments
Adding small amounts of polypropylene and polystyrene microplastics to marine sediments slightly enhanced breakdown of the plasticizer dibutyl phthalate, but higher concentrations inhibited degradation. The findings suggest microplastics alter the chemical fate of co-occurring pollutants in ocean sediments by affecting sorption and microbial communities.
An integrated Metagenomic-Pangenomic strategy revealed native microbes and magnetic biochar cooperation in plasticizer degradation
A combined metagenomic-pangenomic approach identified native Pseudomonas and Pigmentiphaga species that cooperate with magnetic biochar to degrade the plasticizer diethyl phthalate, with Pigmentiphaga capable of fully mineralizing the compound.
Adsorption of di (2-ethylhexyl) phthalate (DEHP) to microplastics in seawater: a comparison between pristine and aged particles
Natural aging of polyethylene and polystyrene microplastics in seawater over three months increased their adsorption capacity for the plasticizer DEHP compared to pristine particles, due to surface oxidation and biofilm formation. The results indicate that environmentally aged MPs are stronger vectors for hydrophobic contaminants than fresh MPs used in most laboratory studies.
Biofilm development as a factor driving the degradation of plasticised marine microplastics
Researchers investigated how natural marine biofilms drive the degradation of plasticized microplastics. The study found that biodegradation was dependent on polymer type, plasticizer type, and time, with polystyrene containing bisphenol A showing the most degradation, coinciding with increased abundance of putative biodegradative bacteria in the colonizing biofilm.
New insights into the decrease in Cd2+ bioavailability in sediments by microplastics: Role of geochemical properties
Researchers investigated how polyethylene terephthalate microplastics alter the geochemical properties of sediments in ways that reduce the bioavailability of cadmium. PET microplastics shifted cadmium from the readily exchangeable fraction to the organically bound fraction, and the associated changes in microbial activity and organic carbon explained much of the reduction in cadmium bioavailability.