Related Experiment Video
Updated: May 9, 2026
09:39
Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites
Published on: November 28, 2014
Functional Groups Determine Biochar Properties (pH and EC) as Studied by Two-Dimensional (13)C NMR Correlation
Xiaoming Li1, Qirong Shen, Dongqing Zhang
1Agricultural Ministry Key Lab of Plant Nutrition and Fertilization in Low-Middle Reaches of the Yangtze River, Nanjing, PR China ; College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, PR China.
Plos One
|July 11, 2013
Summary
This study used advanced NMR spectroscopy to reveal how functional groups develop in biochar during carbonization. It found that specific carbon structures, like fused rings, significantly influence biochar
Area of Science:
- * Materials Science
- * Soil Science
- * Analytical Chemistry
Background:
- * Biochar properties are linked to functional groups, but their development during production is not well understood.
- * Understanding this relationship is crucial for optimizing biochar for various applications.
Purpose of the Study:
- * To investigate the development of functional groups during biochar formation using a novel spectroscopic method.
- * To establish the relationship between specific functional groups and key biochar properties (pH, electrical conductivity).
Main Methods:
- * Application of two-dimensional (2D) (13)C nuclear magnetic resonance (NMR) correlation spectroscopy.
- * Analysis of functional group development during the carbonization of agricultural biomass (rice straw and rice bran).
- * Regression analysis to correlate functional groups with biochar properties.
Main Results:
- * Biochar formation involves dehydroxylation, dehydrogenation, and aromatization, with cleavage of O-alkylated and anomeric O-C-O carbons preceding fused-ring aromatic structure formation.
- * Increasing charring temperature influences the sequence of these chemical transformations.
- * Specific functional groups, such as fused-ring aromatic structures and anomeric O-C-O carbons, were identified as key determinants of biochar pH and electrical conductivity, varying by feedstock.
Conclusions:
- * 2D (13)C NMR correlation spectroscopy is a powerful tool for characterizing functional group development in biochar.
- * The study elucidates the chemical pathways governing biochar property development, offering insights for tailored biochar production.
- * Feedstock type significantly influences the relationship between functional groups and biochar properties.
More Related Videos
Related Concept Videos
02:08Introduction to Functional Groups
Functional groups are group of atoms with specific chemical properties that occur within organic molecules and sometimes denoted as “R”. Functional groups are found along the carbon backbone of macromolecules can form chains or rings of carbon atoms. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of common functional groups
The table below summarizes some of the major functional groups in organic chemistry. (The...
01:10Carbon-13 (¹³C) NMR: Overview
Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
02:22Overview of Advanced Functional Groups
Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of Advanced Functional Groups
The table below summarizes some of the major functional groups in organic chemistry.
01:192D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
01:19Overview of Functional Groups
Functional groups are a group of atoms with characteristic properties, which when linked to the carbon skeleton of a molecule, alter the properties of that molecule. For example, certain functional groups will make a molecule hydrophilic, whereas others will make them hydrophobic. These functional groups are an indispensable part of organic chemistry and important components of biological molecules, such as carbohydrates, proteins, lipids, and nucleic acids. Each functional group is a unique...
02:45Functional Groups
Functional groups are a group of atoms with characteristic properties, which when linked to the carbon skeleton of a molecule, alter the properties of that molecule. For example, the presence of certain functional groups on a molecule will make them hydrophilic, whereas others will make them hydrophobic. These functional groups are an indispensable part of organic chemistry and important components of biological molecules, such as carbohydrates, proteins, lipids, and nucleic acids. Each...