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Figure 1 illustrates the possible chemical reaction in the chemical modification process. According to the structural feature of ACST, the treatment with NaOH can not only  increase the amount of hydroxyl groups in the absorbent, it can also cause the absorbent to swell, which increases the porosity and the specific surface area. The purpose of the addition of  mercaptoacetic acid is to introduce a large amount of sulfydryl groups.  The sulfydryl groups can readily form Cu-S coordination complex, which forms an open network of functional groups on the surface of the absorbent. The addition of sodium sulfide transforms the open network  to a closed network, which leads to the formation of many sulfur (element) on  the surface of the absorbent. Sulfur has a strong affinity to heavy metal ions, it is also the main reaction center on the surface of the absorbent.
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Figure 1 illustrates the possible chemical reaction in the chemical modification process for ACST. According to the structural feature of ACST, the treatment with NaOH can not only  increase the amount of hydroxyl groups in the absorbent, it also causes the absorbent to swell, which increases the porosity and the specific surface area. The purpose of the addition of  mercaptoacetic acid is to introduce a large amount of sulfydryl groups.  The sulfydryl groups can readily form Cu-S coordination complex, which forms an open network of functional groups on the surface of the absorbent. The addition of sodium sulfide transforms the open network  to a closed network, which leads to the formation of many sulfur (element) on  the surface of the absorbent. Sulfur has a strong affinity to heavy metal ions, it is also the main reaction center on the surface of the absorbent.
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Figure 1 illustrates the possible reactions in the chemical modification of ACST. Owning  to the structure of ACST, (adding) NaOH can not only  increase hydroxyl groups in the absorbent, but also swell the absorbent, increase its porosity and specific surface area. The  mercaptoacetic acid added is to introduce a large amount of sulfydryl groups which can yield Cu-S bonds by coordination reaction with Cu ions , leading to an open network of functional groups on the absorbent¡¯s surface. The open network can be changed to a closed one by sodium sulfide and so hold more sulfur (element). Sulfur has a strong affinity for heavy metal ions, and is also the main active site on the surface of the absorbent.
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