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Study on preparation of cellulose based hydrogel doped with nano-calcium carbonate and its adsorption properties of copper ions
Received date: 2024-01-24
Online published: 2024-03-23
Natural cellulose-based hydrogels have strong adsorption properties and are excellent adsorbent for removing heavy metal ions，but hydrogels strength is weak.Through free radical polymerization，acrylic acid（AA） and acrylamide（AM） were grafted onto sodium carboxymethyl cellulose（CMC），and further self-made nano-calcium carbonate（NCC） was doped into the cellulose hydrogel，successfully preparing NCC/CMC composite hydrogel.The pressive performance test results showed that the maximum stress was 48.52 kPa when the maximum strain was 80% and the mass fraction of NCC was 2.5%，and it still reached 39.64 kPa after 20 cycles.The morphology and structure of the hydrogel were characterized using SEM，FT-IR，XRD，and N2 adsorption-desorption test.The results showed that the composite hydrogel had an abundant surface porous structure with a specific surface area of 7.775 m2/g，which was belonged to mesoporous materials.The effects of pH，initial mass concentration of copper ion solution，and temperature on the adsorption amount of copper ions were investigated.The results showed that when the pH of the copper ion solution was 5.5，the temperature was 30 ℃，and the initial mass concentration of the copper ion solution was 150 mg/L，the maximum adsorption capacity of NCC/CMC composite hydrogel for copper ions reached 178 mg/g，and the adsorption capacity was 30 mg/g higher than that of CMC hydrogel.The adsorption process was followed the Langmuir model and the Pseudo-second order.After 5 consecutive adsorption-desorption cycles，the composite hydrogel still has good regeneration performance.
Key words： hydrogel; sodium carboxymethyl cellulose; nano-calcium carbonate; adsorption; Cu2+
BAI Xingxing , LI Hanfei , TANG Yong , ZHANG Jun , ZHU Guangkai , LI Lishuo , TONG Zhangfa . Study on preparation of cellulose based hydrogel doped with nano-calcium carbonate and its adsorption properties of copper ions[J]. Inorganic Chemicals Industry, 2025 , 57(2) : 83 -91 . DOI: 10.19964/j.issn.1006-4990.2024-0046
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