Nitrogen-doped carbon coated transition metal hybrids for the removal of hazardous hexavalent chromium (Cr(VI)) has attracted increasing attention in wastewater treatment recently. In this study, three-dimensional nano-nickel particles embedded in N-doped carbon nanotubes supported on porous biochar (Ni@N-K-C) were synthesized by a two-stage strategy of KOH activation followed by annealing. The effect of KOH activation treatment on the doping process and Cr(VI) removal properties were investigated. The results indicate that KOH activation can improve the pore parameters and promote subsequent doping of Ni and N and the growth of carbon nanotubes (CNTs). After KOH pretreatment, the specific surface area of Ni@N-K-C increased significantly to 604.62 m/g. The improved pore structure accelerates the mass diffusion of Cr(VI) ions and provides an available surface for the adsorption and reduction of Cr(VI). Therefore, the Ni@N-K-C obtained at 900 °C showed a high removal capacity for Cr(VI) (824.4 mg/g) and a stronger ability to reduce to Cr(III).
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jhazmat.2021.125693 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Sustainable CO Capture: N,S-Codoped Porous Carbons Derived from Petroleum Coke with High Selectivity and Stability.
Molecules
January 2025
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua 321004, China.
CO capture from the flue gas is a promising approach to mitigate global warming. However, regulating the carbon-based adsorbent in terms of textural and surface modification is still a challenge. To overcome this issue, the present study depicts the development of cost-effective and high-performance CO adsorbents derived from petroleum coke, an industrial by-product, using a two-step process involving thiourea modification and KOH activation.
View Article and Find Full Text PDFA point-based cognitive impairment scoring system for Southeast Asian adults short title: Cognitive impairment scoring system.
J Prev Alzheimers Dis
January 2025
Saw Swee Hock School of Public Health, National University of Singapore, Singapore. Tahir Foundation Building, 12 Science Drive 2 117549, Singapore; Department of Pharmacology, National University of Singapore, Singapore. 18 Science Drive 4 117559, Singapore; Memory Aging and Cognition Center, National University Health System, Singapore. National University Health System Tower Block, 1E Kent Ridge Road Level 11 119228, Singapore. Electronic address:
Background: Cognitive impairment is a growing concern in Southeast Asian populations, where the burden of cerebrovascular disease (CeVD) is high. Currently, there is no point-based scoring system for identifying cognitive impairment in these populations.
Objective: To develop and validate a simple point-based Cognitive Impairment Scoring System (CISS) for identifying individuals with cognitive impairment no dementia (CIND) and concomitant CeVD in Southeast Asian populations.
Utilising electronic anaesthesia records to audit nitrous oxide consumption and waste, and implementation of a loss monitoring system.
Br J Anaesth
January 2025
Department of Anaesthesia and Surgical Intensive Care, Changi General Hospital, Singapore, Singapore.
The relative contrast ratio of malignant bone lesion is highest on relative Fat Fraction maps compared with T1-weighted and b900 DWI images.
Magn Reson Imaging
January 2025
Department of Radiology, Royal Marsden Hospital, Sutton, UK; Division of Radiotherapy and Imaging, The Institute of Cancer Research, Sutton, UK.
Introduction: Whole-body MRI (WB-MRI) is increasingly used in clinical practice for detection of malignant bone disease. A high relative contrast ratio (RCR) of malignant bone lesions compared with normal bone can improve disease detection in breast, prostate and myeloma malignancies. However, the RCR of malignant bone lesions on T1w, DWI and relative Fat Fraction (rFF) maps derived from Dixon T1w have not been compared.
View Article and Find Full Text PDFDual active site and metal-substrate interface effect endow platinum-ruthenium/molybdenum carbide efficient pH-universal hydrogen evolution reaction.
J Colloid Interface Sci
January 2025
Key Lab of Organic Optoelectronics & Molecular Engineering, Tsinghua University, Beijing 100084, PR China. Electronic address:
Exploring suitable dual active site and metal-substrate interface effect is essential for designing efficient and robust electrocatalysts across a wide pH range for the hydrogen evolution reaction (HER). Herein, alloyed platinum-ruthenium clusters supported on nanosheet-assembled molybdenum carbide microflowers (PtRu/MoC) are reported as efficient pH-universal electrocatalysts for HER. Due to dual active site and metal-substrate interface effect, the optimized PtRu/MoC electrocatalyst exhibits extremely low overpotentials (η) of 9, 19, and 33 mV to deliver 10 mA cm in 0.
View Article and Find Full Text PDFWant 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!