Synthesis of Porous Material from Coal Gasification Fine Slag Residual Carbon and Its Application in Removal of Methylene Blue

Abstract

A large amount of coal gasification slag is produced every year in China. However, most of the current disposal is into landfills, which causes serious harm to the environment. In this research, coal gasification fine slag residual carbon porous material (GFSA) was prepared using gasification fine slag foam flotation obtained carbon residue (GFSF) as raw material and an adsorbent to carry out an adsorption test on waste liquid containing methylene blue (MB). The effects of activation parameters (GFSF/KOH ratio mass ratio, activation temperature, and activation time) on the cation exchange capacity (CEC) of GFSA were investigated. The total specific surface area and pore volume of GSFA with the highest CEC were 574.02 m2/g and 0.467 cm3/g, respectively. The degree of pore formation had an important effect on CEC. The maximum adsorption capacity of GFSA on MB was 19.18 mg/g in the MB adsorption test. The effects of pH, adsorption time, amount of adsorbent, and initial MB concentration on adsorption efficiency were studied. Langmuir isotherm and quasi second-order kinetic model have a good fitting effect on the adsorption isotherm and kinetic model of MB.

A Novel P@SiO2 Nano-Composite as Effective Adsorbent to Remove Methylene Blue Dye from Aqueous Media

“…A comparative evaluation of the maximum adsorption capacity of P@SiO 2 nanocomposite to adsorb MB dye according to the Langmuir isotherm and other adsorbent materials in the literature is listed in Table 7 [ 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 ]. Referring to the recent literature, equilibrium time and adsorption capacities are the main goals for scientists to investigate and develop many novel adsorbent materials.…”

Ambient temperature-prepared BiOBr-supported zero-pretreatment coal gasification fine slag for organic pollutant removal

“…Due to the relative abundant constituent elements of CGFS such as carbon, silicon, aluminum, and iron, CGFS can be recycled as a supplemental combustion fuel and electromagnetic wave absorber. 6,7 In addition, owing to the highly developed pore structure, CGFS can be modified and potentially used as an adsorbent for CO 2 , 8,9 mercury, 10 and organic pollutants in water such as humic acid, 11 methylene blue (MB), 12 crystal violet, 13 nitrate, 14 and phenol. 15–19 For example, Zhang et al obtained residual carbon porous material (GSFA) from CGFS by gasification fine slag foam flotation to remove MB.…”

“…15–19 For example, Zhang et al obtained residual carbon porous material (GSFA) from CGFS by gasification fine slag foam flotation to remove MB. 12 Wu et al synthesized MCM-41 and carbon/zeolite composite from coal gasification fine residue (CGFR) for adsorbing crystal violet. 13 In addition, there are some other attempts for its use as a supporter to treat pollutants.…”

Mesoporous Spherical Silica Filler Prepared from Coal Gasification Fine Slag for Styrene Butadiene Rubber Reinforcement and Promoting Vulcanization

“…Based on the characteristics of coal gasification slag, different functions have been assigned to it by many researchers. Mesoporous silica [ 9 ] material, residual carbon adsorbent [ 10 ], and Y-type zeolite/carbon porous composites [ 11 ] were prepared by acid leaching, floating, and the hydrothermal synthesis method from CFS to absorb the organic pollutants in water. The maximum adsorption capacity of these materials was excellent, benefiting from their large specific surface area, high porosity, and chemical stability [ 12 ].…”