Preparation of halloysite nanotubes-encapsulated magnetic microspheres for elemental mercury removal from coal-fired flue gas

Gaseous Arsenic Capture in Flue Gas by CuCl2-Modified Halloysite Nanotube Composites with High-Temperature NOx and SOx Resistance

“…The adsorption quantity increased with the initial concentrations (Figure b) (the details are presented in Supporting Information). The large capacity was mainly ascribed to the presence of sufficient active sites for arsenic capture and a driving force that facilitated arsenic uptake by high concentration of arsenic. , …”

“…The large capacity was mainly ascribed to the presence of sufficient active sites for arsenic capture and a driving force that facilitated arsenic uptake by high concentration of arsenic. 25,37 In the temperature range of 300−600 °C, higher temperature was beneficial to the chemical reaction between the adsorbent and arsenicals, further promoting adsorption (Figure 2c). 43,47 As 2 O 3 (g) was captured through both physical and chemical adsorption.…”

“…Halloysite nanotubes (HNTs), with the general formula Al 2 Si 2 O 5 (OH) 4 ·nH 2 O, contain octahedral gibbsite Al­(OH) 3 and tetrahedral SiO 4 sheets. − Because of the peculiar structure, favorable biocompatibility, unique physicochemical properties, and low cost, , HNTs have been applied for catalytic oxidation, , drug delivery, flame retardancy, and environment remediation. ,,, HNTs also possessed high adsorption capacity for both CO 2 in the gas phase and arsenic [As­(III) and As­(V)] from water. ,, Because of their high adsorption capacity and catalytic activity, HNTs can be reasonably valuable to be modified and tried for As 2 O 3 (g) removal.…”

“…As­(V) has been found to be more easily captured and more stable than As­(III) because of its strong affinity with active sites on natural minerals. , Hence, a feasible strategy could be to load active substances on HNTs, promoting the oxidation of As­(III) to As­(V). A series of metal salts (CuCl 2 , FeCl 3 , and CoCl 2 ) was employed to modify HNTs for pollution control. ,,− As a modifier for arsenic capturers, it was feasible and attractive to apply CuCl 2 due to its high oxidation performances. ,, Therefore, the aspects of the present study are as follows: (1) an effective composite for arsenic capture would be prepared by modifying HNTs with CuCl 2 using ultrasonic-assisted wet impregnation, (2) the adsorption capacity of the as-prepared adsorbent for As 2 O 3 (g) and the tolerance to NO x and SO x at high temperature would be evaluated, and (3) DFT would be employed to reveal the molecular mechanism of arsenic adsorption on the modified HNTs.…”

“…6,32,35−41 As a modifier for arsenic capturers, it was feasible and attractive to apply CuCl 2 due to its high oxidation performances. 25,40,42 Therefore, the aspects of the present study are as follows: (1) an effective composite for arsenic capture would be prepared by modifying HNTs with CuCl 2 using ultrasonic-assisted wet impregnation, (2) the adsorption capacity of the as-prepared adsorbent for As 2 O 3 (g) and the tolerance to NO x and SO x at high temperature would be evaluated, and (3) DFT would be employed to reveal the molecular mechanism of arsenic adsorption on the modified HNTs.…”