Facile Synthesis of Thiol-Functionalized Magnetic Activated Carbon and Application for the Removal of Mercury(II) from Aqueous Solution

Abstract

To improve the adsorption capacity, reduce the disposal cost, and enhance the separation efficiency of common activated carbon as an adsorbent in wastewater treatment, a novel thiol-modified magnetic activated carbon adsorbent of NiFe 2 O 4 -PAC-SH was successfully synthesized with a facile and safe hydrothermal method without any toxic and harmful reaction media. The as-prepared NiFe 2 O 4 -PAC-SH can effectively remove mercury(II) ions from aqueous solution. The maximal adsorption capacities from the experiment and Langmuir fitting achieve 298.8 and 366.3 mg/g at pH 7, respectively, exceeding most of adsorptive materials. The as-prepared NiFe 2 O 4 -PAC-SH has an outstanding regeneration performance, remarkable hydrothermal stability, and efficient separation efficiency. The data of kinetics, isotherms, and thermodynamics show that the adsorption of mercury(II) ions is spontaneous and exothermic. Ion exchange and electrostatic attraction are the main adsorption factors. The experimental results exhibit that the NiFe 2 O 4 -PAC-SH can be a prominent substitute for conventional activated carbon as an adsorbent.

Preparation of Micro-Nano Material Composed of Oyster Shell/Fe3O4 Nanoparticles/Humic Acid and Its Application in Selective Removal of Hg(II)

“…Moreover, the nano-iron/oyster shell (NI/OS) composites were found to have better removal performance than NI in As 3+ adsorption [24], which further proved the important role of OS as a carrier. To further discuss the adsorption performance, OS/Fe 3 O 4 /HA was compared to several different types of adsorbents (Table 3) [32,46,47,48,49,50]. Specifically, the maximal adsorption quantity of the thiol-modified Fe 3 O 4 @SiO 2 was 148.8 mg·g −1 , but the reaction rate was slightly slower than that of OS/Fe 3 O 4 /HA [46].…”

Smart Adsorbents for Aquatic Environmental Remediation

“…[182] with 366 mg g −1 of Hg 2+ adsorption capacity (pH:7, T: 298 K, C 0 : 30 mg L −1 ). [183] An AC was magnetized with both FeCl 3 and ferrous sulfate (FeSO 4 ) and then impregnated with Aliquat 336 (N-Methyl-N,N,N-trioctylammonium chloride), the functionalized MAC was used for BPA adsorption with a capacity of 1.6 mg g −1 (T: 303 K, C 0 : 10-50 mg L −1 ). [184] In the case of organic pollutants, research has been recently directed to adsorptive-reactive removal by functionalized MAC.…”

The adsorption of lemon yellow dye using cationic cellulose fibers from rice straw as a sustainable biosorbent in aqueous media

“…The primary components of rice straw are cellulose (43.2%), hemicellulose (11.5%), and lignin (28.9%). Rice straw is rich in hydroxyl groups, aldehyde groups, and carboxyl groups, as well as other active groups, which can undergo a variety of chemical modification reactions (Chen et al 2019). Recently, using rice straw as a biosorbent to adsorb dye wastewater has been a popular research topic.…”