端氨基超支化聚合物接枝双醛基纳米纤维素的制备及其对Ni2+的吸附

doi:10.3969/j.issn.0253-2417.2019.04.003

Abstract

Abstract:

Amino-terminal hyperbranchedpolymer(HBP-NH₂) was synthesized by polycondensation.Carboxylatednanocellulose(CNC) was prepared from eucalyptus pulp by using ultrasonic assisted 2, 2, 6, 6-tetramethylpiperidinyl-1-oxy (TEMPO)radical oxidation, and dialdehyde-based nanocellulose(DNC) was further obtained by sodium periodate oxidation of CNC. Finally, the amino-terminated hyperbranched polymer grafted dialdehyde-basednanocellulosematerial(HBPN-DNC) was prepared by amination modification of DNC with HBP-NH₂. The reaction conditions were optimized. When the addition of 10% HBP-NH₂ solution was 10 mL, the reaction temperature was 70℃, and the reaction time was 4 h, the N element mass fraction reached the highest, 6.0%. The structure and properties of nanocellulose were characterized by various methods. The results showed that the amino group was successfully graftedonto DNC. The molecular chain became longer and the thermal stability of the HBPN-DNC improved.The adsorption properties of Ni²⁺ on HBPN-DNC showed that, under the conditions of room temperature, 0.1 g of HBPN-DNC adsorbent, initial mass concentration of adsorption solution of 500 mg/L, pH value of 5 and adsorption time of 3 h, the adsorption capacity was 150.21 mg/g. The adsorptionfollowed the pseudo second order kineticsequation and Langmiur adsorption isotherm, which indicated that the adsorption process was mainly chemical adsorption of single molecular layer.

Key words: eucalyptus pulp, nanocellulose, aminolation, adsorption

CLC Number:

TQ35

Jinwei CHEN,Dan WANG,Shibin SHANG,He LIU,Zhaosheng CAI. Preparation of Amino-terminated Hyperbranched Polymer Grafted Dialdehyde-based Nanocellulose and Its Adsorption Properties of Ni²⁺[J]. Chemistry and Industry of Forest Products, 2019, 39(4): 18-26.

Figures/Tables 12

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样品samples	C	H	O	N	S
CNC	36.28	5.18	58.54	0	0
DNC	36.08	5.14	58.78	0	0
HBPN-DNC	43.02	6.77	44.21	6.00	0

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Preparation of Amino-terminated Hyperbranched Polymer Grafted Dialdehyde-based Nanocellulose and Its Adsorption Properties of Ni²⁺

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Preparation of Amino-terminated Hyperbranched Polymer Grafted Dialdehyde-based Nanocellulose and Its Adsorption Properties of Ni2+

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Preparation of Amino-terminated Hyperbranched Polymer Grafted Dialdehyde-based Nanocellulose and Its Adsorption Properties of Ni²⁺