Application of modified cellulose adsorbent (1)

[Application] Cellulose has been chemically modified by different methods to obtain many adsorbents with different functions.
At present, these adsorbents have been widely used in biomedicine, biochemical, environmental protection and other aspects
.

Modified cellulose can be used in clinical medicine to separate various required enzymes in different matrices, and it can also be used for blood analysis through its selective adsorption

Zhang Yuxia et al.
prepared modified cellulose by etherifying sesame stalk cellulose and reacting with quaternary ammonium salt, and used it for the adsorption of aniline, and found that the removal rate of aniline could reach 93.
2%
.

Wang Shaomin and others used secondary amine nitrocellulose to adsorb the nephrotoxic substance creatinine.

The author and members of the research group used homemade spherical cellulose adsorbents containing different groups to treat heavy metal ions such as Cu ²⁺ , Co ³⁺ , Cr ³⁺ , Nd ³⁺ , Cr ⁶⁺ , Ni ²⁺ and surfactants (SDBS ), amino acids, etc.
, have achieved good adsorption effects
.

The spherical cellulose chelating adsorbent containing imidazoline groups and carboxyl groups was used to adsorb surfactants, and the following conclusions were obtained
.

① The main factors that affect the adsorption effect of the adsorbent on SDBS are the initial mass concentration of SDBS, the pH value of the adsorbent, the adsorption time and the adsorption temperature, etc.

The basic amino acids ( L-lysine , L-arginine and L-histidine ) were adsorbed by the carboxylic acid type spherical cellulose adsorbent , and the following conclusions were obtained
.

① The static adsorption isotherm conforms to the Langmuir adsorption isotherm

Qiao Sha et al.
prepared a cellulose adsorbent based on the ATRP method.
First, chloroacetyl chloride was used as an esterification agent to undergo a homogeneous acetylation reaction with cellulose in the ionic liquid BMIMCI to obtain the ATRP macroinitiator (Cell-CIAc).
Then use Cell-CIAc as ATRP initiator, glycidyl methacrylate (GMA) as monomer, CuBr/bpy as catalyst, and perform ATRP of GMA to prepare cellulose graft with controllable structure and narrow molecular weight distribution.
Copolymer Cell-g-PGMA, and study the ATRP reaction kinetics
.

The research results show that the reaction process conforms to the first-order reaction kinetics law, which proves that the ATRP polymerization reaction is "active"/controllable.

Secondly, using Cell-g-PGMA as the matrix, the ring-opening modification was carried out with ethylenediamine, and the influence of various factors in the preparation process of the adsorbent was studied through single factor experiments
.

The result of the study is that when the amount of ethylenediamine is 20mL, the preparation temperature is 80℃, and the preparation time is 1h, the nitrogen content of the obtained adsorbent NPGMA is 10.

Third, the experiment used the static adsorption method to study the adsorption performance of NPGMA on the hexavalent chromium solution, including the pH value of the solution, the initial concentration, the adsorption time, and the adsorption temperature.
At the same time, the adsorption kinetics and thermodynamics were studied.
And the adsorption mechanism was discussed
.

The adsorption experiment showed that NPGMA has excellent adsorption performance for Cr(VI), and its adsorption capacity and removal rate reached 99.

Related links: Modified cellulose adsorbent (4)