Removal of Hg2+ from desulfurization wastewater by tannin-immobilized graphene oxide

Abstract

A novel adsorbent by immobilizing tannic acid (TA) on graphene oxide (GO) was proposed and used to remove Hg 2+ from desulfurization wastewater. The morphology and physic-chemical property of tanninimmobilized graphene oxide (TAIGO) was characterized by Scanning electron microscopy (SEM), Atomic Force Microscope (AFM), and Fourier transform infrared spectroscopy (FTIR). The characterization results showed that the TA was immobilized on the GO successfully, and new functional groups were introduced on TAIGO. The effect of contact time, adsorbent dose, pH, and ion components on removal e ciency were evaluated. It was found that the adsorption process would complete within 15 min, and a higher removal e ciency could be obtained on the increased adsorbent dosage. The pH value would affect the protonation process of TAIGO and the form of Hg 2+ in the wastewater. The high-concertation Cland SO 3 2would hinder the absorption performance, while SO 4 2and cations had a negligible impact.Besides, an excellent economic bene t of TAIGO was achieved in the regeneration performance evaluation experiment, and removal e ciency of was 88% remained after three recycles. Most importantly, the TAIGO exhibited a better adsorption performance and economic bene t than GO and TA.The adsorption process was tted with the pseudo-second-order kinetic model(R=0.9995), and the adsorption of TAIGO for Hg 2+ was mainly relies on the functional groups on GO and the chelation reaction between TA and Hg 2+ . These facts indicated that the TAIGO was a low-cost and high removal ofHg 2+ e ciency adsorbent, which could be further used in the practical desulfurization wastewater.

Advances in the adsorption of heavy metal ions in water by UiO-66 composites

“…Several approaches are employed for the treatment of heavy metal pollution in wastewater, including chemical precipitation ( Sarker et al, 2018 ), ion exchanges ( Hashim et al, 2011 ), membrane separation ( Chen et al, 2021a ), evaporation ( Chen et al, 2010 ), electro-coagulation ( Bouhamed et al, 2012 ), and sorption ( Al-Shannag et al, 2015 ; Chen et al, 2021b ; Dong et al, 2021 ). Among these, the adsorption technique is widely recognized as the optimal choice for removing contaminants from water ( Dinari and Tabatabaeian, 2018 ; Duman et al, 2020 ; Hoslett et al, 2020 ; Tabatabaeian et al, 2021 ).…”

Highly Efficient Removal of Mercury Ions from Aqueous Solutions by Thiol-Functionalized Graphene Oxide

“…The treatment of graphene materials without impairing their peculiar performances has resulted in advances in chemical modification of graphene materials. Graphene oxide (GO), an important derivative of graphene, is a two-dimensional sheet-structured material with a honeycomb host [2][3][4]15]. In addition to the large specific surface area of graphene, GO contains a considerable quantity of oxygencontaining functional group, such as carboxyl and hydroxyl groups, between the sheets, which results in good water solubility and easy functionalization characteristics [3,4,15].…”

“…Graphene oxide (GO), an important derivative of graphene, is a two-dimensional sheet-structured material with a honeycomb host [2][3][4]15]. In addition to the large specific surface area of graphene, GO contains a considerable quantity of oxygencontaining functional group, such as carboxyl and hydroxyl groups, between the sheets, which results in good water solubility and easy functionalization characteristics [3,4,15]. However, GO is highly hydrophilic, easily agglomerated in aqueous solutions, and has a single functional group type and low functional group density [3,4,15].…”

Preparation of tannic acid and l-cysteine functionalized magnetic composites for synergistic enrichment of N-glycopeptides followed by mass spectrometric analysis

“…13 When used as an adsorbent, TA oen needs to be imbedded with substrates, e.g., Fe 3 O 4 , 9,14 SiO 2 , 15,16 and graphene oxide. 17,18 Among them, magnetic Fe 3 O 4 is an attractive option of substrates due to its advantages of rapid separation, simple preparation, good biocompatibility, and low cost. [19][20][21] Graing TA onto Fe 3 O 4 enables the adsorbent to be rapidly separated using an external magnet and thus efficiently accelerates the adsorption process.…”

“…, Fe 3 O 4 , 9,14 SiO 2 , 15,16 and graphene oxide. 17,18 Among them, magnetic Fe 3 O 4 is an attractive option of substrates due to its advantages of rapid separation, simple preparation, good biocompatibility, and low cost. 19–21…”