Ageing is a common phenomenon during biochar storage and its soil application. In this study, we exposed sludge-derived biochar (SDBC) in the air under 4 °C, 22 °C, and 45 °C for 30-120 d to imitate the ageing process after SDBC production. The aged SDBC was characterized and its sorption capacities for Pb(II), Cr(V) and As(III) were compared with the fresh ones in batch sorption experiments. The results showed an increase in acidity, cation exchange capacity, and carboxyl groups of SDBC surface, but a decrease in alkalinity and Fe(III) species during ageing, indicating the oxidation. In addition, ageing for more than 30 d was found to favor the Pb(II) and As(III) sorption, because of higher density of available oxygen-containing groups. The Cr(VI) sorption was found to be compromised by the ageing, because some reducing agents for Cr(VI) reduction was consumed there. Higher temperatures accelerated the above-mentioned ageing effect. Yet, when the SDBC was applied in the heavy-metal contaminated soil, its performance would be affected by both ageing of SDBC itself as well as long-term interactions among soil components, such as colloids and solution, heavy metals, and SDBC, which require further investigation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.chemosphere.2017.05.175 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Sex Differences in Late-life Cognition: A Psychometric Network Analysis of Well-functioning Older Adults.
Am J Geriatr Psychiatry
December 2024
Department of Gerontology, Faculty of Social Welfare & Health Sciences, University of Haifa, 199 Aba Khoushy Ave, Haifa, 3498838, Israel. Electronic address:
Objective: Unidentified sex differences in old-age cognition may emerge in psychometric networks, which look beyond mean scores into the unique cognitive structure of males and females. Accordingly, this study aims to examine cognition in well-functioning older males and females with psychometric network analysis.
Methods: The current cohort (N = 2,802) of community-dwelling adults (≥65 years) was derived from the Advanced Cognitive Training for Independent and Vital Elderly study.
Senescent brain cell types in Alzheimer's disease: Pathological mechanisms and therapeutic opportunities.
Neurotherapeutics
January 2025
Department of Neurology, Washington University School of Medicine in St Louis, MO, USA; St Louis VA Medical Center, St Louis, MO, USA. Electronic address:
Cellular senescence is a cell state triggered by programmed physiological processes or cellular stress responses. Stress-induced senescent cells often acquire pathogenic traits, including a toxic secretome and resistance to apoptosis. When pathogenic senescent cells form faster than they are cleared by the immune system, they accumulate in tissues throughout the body and contribute to age-related diseases, including neurodegeneration.
View Article and Find Full Text PDFCharacteristics of older patients undergoing surgery in the UK: SNAP-3, a snapshot observational study.
Br J Anaesth
January 2025
Centre for Research and Improvement, Royal College of Anaesthetists, London, UK; Anaesthesia a Critical Care, Injury, Recovery and Inflammation Sciences, University of Nottingham, Nottingham, UK.
Background: Frailty and multimorbidity are common in older adults, but the prevalence and interaction of these conditions in surgical patients remain unclear. This study describes the clinical characteristics of a heterogeneous cohort of older UK surgical patients.
Methods: We conducted a prospective observational cohort study during 5 days in March 2022, aiming to recruit all UK patients aged 60 yr and older undergoing surgery, excluding minor procedures (e.
Social-economic inequalities and early-life exposure to famine contribute to low grip strength: The China National Health Survey.
Nutr Metab Cardiovasc Dis
December 2024
Department of Epidemiology and Statistics, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & School of Basic Medicine, Peking Union Medical College, Beijing, China; State Key Laboratory of Common Mechanism Research for Major Diseases, Beijing, China. Electronic address:
Background And Aim: The relationship between socio-economic inequalities (SEIs) and early life malnutrition with muscle health remains unclear. This study aims to examine the effects of SEIs and early life exposure to famine on relative hand grip strength (rHGS).
Methods And Results: We analyzed data of 37,008 individuals from the China National Health Survey.
Effect of uniaxial bending methods on the flexural strength and Weibull analysis of heat-polymerized, CAD/CAM milled, and 3D-printed denture base resins.
Dent Mater
January 2025
Department of Oral Technology, Medical Faculty, University Hospital Bonn, Bonn, North Rhine-Westphalia, Germany; Department of Fixed Prosthodontics, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt.
Objectives: To compare the flexural strength and modulus of denture base resins manufactured by conventional methods, 3-dimensional (3D) printing, and computer-aided design and computer-aided manufacturing (CAD/CAM) milling using 3-point bending (3PB) and 4-point bending (4PB) methods after simulated aging.
Methods: Ninety bars (64 ×10 ×3.3 mm) were prepared from heat-polymerized (Lucitone-199), CAD/CAM milled (G-CAM), and 3D-printed (Denturetec) denture base resins (n = 30 per material).
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!