Abstract
The absorbent resin for Cu2+ removal was prepared under microwave irradiation through grafting acrylamide (AM) and acrylic acid (AA) to cellulose. The initiator is a kind of redox system composed of potassium persulfate/sodium thiosulfate. The crosslinking agent is N,N′‐methylene bisacrylamide. The optimal reaction conditions are as follows: the ratio of AA to cellulose is 10 : 1, initiator to AA is 0.65 wt%, crosslinking agent to AA is 1.0 wt%, neutralization degree of AA is 75%, microwave power level is 320 W, and time is 300 s. The maximum absorption capability of the resin is 65 mg·g−1. Different from previous studies, the reaction was carried out without the protection of nitrogen and troublesome posttreatment. The product was obtained directly by one‐step synthesis without purification and drying of the crude product. The pollution and cost caused by organic solvent are avoided, and the whole preparation period is shortened deeply. Moreover, the time of absorption equilibrium is shorter. In a word, the preparation in this paper has the obvious advantages, such as simple process, short time, no pollution, low‐energy, and low‐cost.
Highlights
In order to enhance the qualities of our living environment, the removal of heavy metal ions in soil and water has become urgent and important. e removal methods and technologies are imperative and have aroused environmentalists’ high attention. ere are various conventional technologies [1,2,3,4,5,6,7,8,9,10] to remove heavy metal ions from wastewater, such as coagulation, oxidation/filtration, chemical precipitation, reverse osmosis, absorption, electrochemistry, and ion exchange
N,N′Methylene bisacrylamide is a crosslinking agent. ere are two kinds of grafted monomers, which are acrylic acid (AA) and acrylamide (AM). ese chemicals are of analytical grade and were used directly without further purification
E microwave reactor is a self-modified Galanz domestic microwave oven (Guangdong, China, 2450 MHz and 800 W). e concentrations of metal ions were determined by atomic absorption spectroscopy (AAS)
Summary
In order to enhance the qualities of our living environment, the removal of heavy metal ions in soil and water has become urgent and important. e removal methods and technologies are imperative and have aroused environmentalists’ high attention. ere are various conventional technologies [1,2,3,4,5,6,7,8,9,10] to remove heavy metal ions from wastewater, such as coagulation, oxidation/filtration, chemical precipitation, reverse osmosis, absorption, electrochemistry, and ion exchange. Ere are various conventional technologies [1,2,3,4,5,6,7,8,9,10] to remove heavy metal ions from wastewater, such as coagulation, oxidation/filtration, chemical precipitation, reverse osmosis, absorption, electrochemistry, and ion exchange. Polymeric absorbents using some natural macromolecule compounds as grafted framework to prepare heavy metal ions removal absorbent resin are promising and attractive [11,12,13,14,15,16,17]. In our previous studies [18,19,20,21,22], acrylic acid (AA) and/or acrylamide (AM) were grafted to starch or cellulose using the microwave irradiation method, and the heavy metal ions absorbing capacities of these manually modified natural products had been evaluated thoroughly.
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