Effects of aging and transformation of anatase and rutile TiO nanoparticles on biological phosphorus removal in sequencing batch reactors and related toxic mechanisms.

J Hazard Mater

Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, People's Republic of China; College of Environment, Hohai University, Nanjing, 210098, People's Republic of China.

Published: November 2020

The effect of nanomaterials aging, namely the transformation of comprehensive characteristics after experiencing real or complex environmental behaviors, on their ecotoxicology is still lacking. Moreover, the mechanisms by which NPs influence biological phosphorus (P) removal during sewage treatment require further elucidation. Therefore, we used both pristine and aged anatase (TiO-A) and rutile (TiO-R) NPs to investigate the mechanisms by which NPs affect P removal in a SBR. At 0.1 mg/L, the four types of NPs (pristine and aged) had no significant effect on sludge purification after acute (72-h) exposure under simulated sunlight. However, at 50 mg/L-regardless of the crystalline phase of the NPs-SOP and COD removal efficiency dropped steeply to approximately 42.2-82.4 % (p < 0.05) and 69.8-83.3 % (p < 0.05), respectively, especially in the pristine TiO-NPs groups because of decrease of richness and diversity of genus level of PAOs and enzyme activity of both PPK and PPX, and the sluggish transformation of PHA and glycogen. Aging reduced the ability of NPs toxicity. The toxicity mechanisms of TiO-NPs included lipid peroxidation and contact damage, or leakage from bacterial cytoplasmic membrane, which are closely related to photooxidation capacity and aqueous solution stability-i.e., nanoscale effects-and the impacts of aging or inclusion.

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jhazmat.2020.123030DOI Listing

Publication Analysis

Top Keywords

aging transformation
8
biological phosphorus
8
phosphorus removal
8
mechanisms nps
8
pristine aged
8
nps
5
effects aging
4
transformation anatase
4
anatase rutile
4
rutile tio
4

Similar Publications

This study aims to utilize secondary aluminum dross waste to synthesize Fe-Al layered double hydroxide (Fe-Al LDH) for efficient adsorption of arsenic from drinking water. The synthesis process was based on a multi-step hydrometallurgical approach, in which the aluminum content in the waste was first converted to sodium aluminate. This was followed by the transformation into Fe-Al LDH through a series of processes, including gelation, sol formation, simultaneous precipitation, and aging.

View Article and Find Full Text PDF

The COVID-19 pandemic and increased demands for neurologists have inspired the creation of remote, digitalized tests of neurological functions. This study investigates two tests from the Neurological Functional Tests Suite (NeuFun-TS) smartphone application, the "Postural Sway" and "Pronator Drift" tests. These tests capture different domains of postural control and motoric dysfunction in healthy volunteers (n=13) and people with neurological disorders (n=68 relapsing-remitting multiple sclerosis [MS]; n=21 secondary progressive MS; n=23 primary progressive MS; n=13 other inflammatory neurological diseases; n=21 non-inflammatory neurological diseases; n=4 clinically isolated syndrome; n=1 radiologically isolated syndrome).

View Article and Find Full Text PDF

Background: Drug use disorder (DUD) poses a major public health crisis globally, necessitating immediate attention to global trends and future projections to develop effective health policies and interventions. Thus, we aimed to estimate the global trends in DUD mortality rates from 1990 to 2021 and future projections of DUD deaths until 2040 across 73 countries.

Methods: In this time-series analysis and modelling study, we investigated the global trends in DUD mortality rates from 1990 to 2021 using the WHO Mortality Database and forecasted future trends through 2040.

View Article and Find Full Text PDF

High BMP7 Expression May Worsen Airway Disease in COPD by Altering Epithelial Cell Behavior.

Int J Chron Obstruct Pulmon Dis

January 2025

Department of Obstetrics and Gynecology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, People's Republic of China.

Purpose: Airway disease is the main pathological basis of chronic obstructive pulmonary disease (COPD), but the underlying mechanisms are unknown. Bone morphogenetic protein-7 (BMP7) is a multi-functional growth factor that belongs to the transforming growth factor superfamily, which affects the regulation of proliferation, differentiation, and apoptosis. Previous research has shown that BMP7 is highly expressed in the airway epithelia of patients with COPD, but its role in airway disease has not been fully elucidated.

View Article and Find Full Text PDF

Objectives: To describe sociodemographic characteristics and comprehensive day-to-day care and support needs of older Victorians requiring government-funded home-based aged-care, and to explore associations between vulnerability factors and complexity indicators in this population.

Methods: A population-based observational study was conducted using de-identified, routinely collected aged-care assessment data for Victorians approved for a Home Care Package (HCP) between January 2019 and June 2022.

Results: The study population (n = 94,975 individuals), approved for one of four HCP levels (Levels 1 (5%), 2 (38%), 3 (34%) or 4 (24%)), was aged 82 years on average (SD 7.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!