Abstract
It is of great significance to realize the sustainable development of the environment to synthesize functional materials by value-added utilization of waste resources. Herein, a composite material of polyacrylic acid/lignosulfonate sodium/cotton biochar (PAA/LS/BC) was successfully prepared by grafting polyacrylic acid with functionalized waste cotton biochar and lignosulfonate sodium. The obtained absorbent showed prominent capture ability toward Pb2+ and methylene blue (MB) with capture characteristics of the pseudo-second-order model and Langmuir isotherm model. This experiment explored the adsorption performance of the adsorbent for pollutants at different conditions, and further revealed the selective adsorption of Pb2+ and MB in the mixed system. Analysis confirmed that electrostatic attraction and complexation are the most critical methods to remove contaminants. Additionally, the regeneration and stability experiment showed that the adsorption capacity of PAA/LS/BC for pollutants did not significantly decrease after five runs of adsorption–desorption. Various results can demonstrate that the adsorbent has excellent performance for removing pollutants and can be used as a material with development potential in the field of adsorption.
Highlights
Environmental pollution has always been a major fatal problem that plagues mankind, among which water pollution is the most prominent problem
Because methylene blue (MB) is stable in nature and extremely difficult to degrade in aqueous solution, it is necessary to develop an excellent method for the targeted removal of MB [10,11]
The dried waste cotton was put into tube furnace and heated at 400 ◦C for 0.5 h, the temperature was ramped to 800 ◦C for 1 h at a heating rate of 5 ◦C min−1 to activate the combination
Summary
Environmental pollution has always been a major fatal problem that plagues mankind, among which water pollution is the most prominent problem. Heavy metal ions and dyes in wastewater can enter the human body under the action of biological circulation and eventually pose a potential threat to human health. Among the common cationic dyes, methylene blue (MB) is considered to be the most representative pollutant, it is soluble in water or ethanol, and the aqueous solution is alkaline and toxic. The adsorption method is considered to be the most widely used method in water pollution treatment technology with its unique advantages, which is high efficiency, but its simple operation, and the fact it can remove a variety of different types of pollutants such as heavy metal ions and dyes [12]. The most important step in using adsorption technology to treat wastewater is to prepare an environmentally friendly, low-cost, and highly effective adsorbent with excellent affinity for pollutants [13,14]
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