Characteristics of pores in coals exposed to acid mine drainage

Tang, Hao; Luo, Jinzhi; Zheng, Lu; Liu, Chiyang; Li, Hua-hua; Wu, Guannan; Zeng, Mengli; Bai, Xue‐Song

doi:10.1016/j.egyr.2021.11.055

Cited by 9 publications

(3 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Except for Mn, the other metals meet class III of the environmental quality standards for surface water. For SO 4 2− , remarkable reduction occurred from 120 to 210 d (at the surface of the constructed sediments, Eh: from −90 mV to −255 mV) [8]. Compared to the control microcosms (AMDW), the sulphate concentrations decreased dramatically from 2500 to 1700 mg•L −1 (Figure 4(f ); Table 1) due to the high rates of sulphur removal [30].…”

Section: Effects Of Remediation Onmentioning

confidence: 96%

“…In aquatic ecosystems, it can be observed as a severe disturbance or even destruction of the water quality and the functions, habitats, biological communities, and species composition of these ecosystems. Studies have shown that AMD could signi cantly decrease the water quality [8,9] and the activity of the invertebrates, aquatic plants, or zoobenthos [10]. Additionally, it may also a ect the degradation of plant litter in the streams [11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Combined Application of Surface Floating Wetlands and Bottom Anaerobic to Remediate AMD-Contaminated Lakes

Wang³

et al. 2022

Journal of Chemistry

View full text Add to dashboard Cite

Acid mine drainage (AMD) causes environmental pollution that affects many countries with historic or current mining industries. The eco-remediation system (RW) which combined surface floating wetlands and bottom anaerobic sediments (SFW-BAS) was selected for AMD-contaminated lakes (AMDW). Meanwhile, AMDW and nature aquatic ecosystems (NW) were set as the control groups, respectively. The parameters, including pH, Eh, Fe, Mn, SO42−, and the degradation rate of the native dominant plant litter were investigated to assess the effects of remediation. The results showed that the average of pH, Eh, and EC, was 2.73, 484.08 mv, and 2395.33 μs·cm−1, respectively. The average content of SO42−, Fe, Mn, Cu, Zn, and Pb was 2190 mg·L−1, 40.2 mg·L−1, 4.6 mg·L−1, 249.2 μg·L−1, 1563 μg·L−1, and 112.9 μg·L−1, respectively. The degradation rate of plant litters in AMDW ranged from 14.5% to 22.6%. However, RW ultimately improved the water quality and the degradation of litters. RW has a good effect on buffering the acidity, ranging from 3.96 to 7.41. The pH of RW (6.14) is close to that of NW (7.41). The average content of SO42−, Fe, Mn, Cu, Zn, and Pb was 2071 mg·L−1, 3.4 mg·L−1, 2.4 mg·L−1, 85.3 μg·L−1, 607.4 μg·L−1, and 47.8 μg·L−1, respectively, which showed good pollutant removal performance. The degradation rate of plant litters in RW ranged from 27.8% to 32.6%. Therefore, RW can be used to remediate AMDW.

show abstract

Section: Effects Of Remediation Onmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

The Combined Application of Surface Floating Wetlands and Bottom Anaerobic to Remediate AMD-Contaminated Lakes

Wang³

et al. 2022

Journal of Chemistry

View full text Add to dashboard Cite

show abstract

“…7631-86-9), [43] which is reported by the manufacturer to possess a BET surface area ranging between 300 to 400 m 2 /g and a pore size of 4 nm, the silica synthesized in this study exhibits a notably greater surface area. The presence of pores in the template-free silica are due to the etching of the pores [54,55] and infiltration of the acid through cracks of the activated coal fly ash dissolving all acid-soluble phases in the matrix creating larger pore sizes, [54,56] resulting in a high surface area. Other comparable studies are shown in table 4 below:…”

Section: Bet Analysismentioning

confidence: 99%

High‐Purity Template‐Free Mesoporous Silica Synthesized FROM Coal Fly Ash

Manyepedza,

Gaolefufa,

Beas

et al. 2024

ChemistrySelect

View full text Add to dashboard Cite

The study demonstrates a new method to create high‐purity mesoporous silica from coal fly ash without using structure‐directing agents. Divided into two stages, the process involves pre‐treating the ash with Na2CO3, calcination, cooling, washing, and drying to yield a dehydrated sample. Subsequently, silica synthesis occurs through an acid refluxing technique using thermally activated coal fly ash with Na2CO3. Key factors impacting synthesis include acid content and liquid‐to‐solid ratio. The study extensively employs various characterization methods like XRF, XRD, FTIR, and BET analysis, revealing a 99.1 % purity in silica content, a surface area of 793.51 m2/g, and a pore size of 3.9 nm. Optimal conditions for this synthesis involve 80 °C temperature, 2‐hour reaction time, 25 % hydrochloric acid concentration, and a 10 : 1 liquid‐to‐solid ratio. FTIR spectra demonstrate similarities between the obtained silica and commercial Sigma Aldrich silica. This innovative approach presents a promising avenue for generating top‐quality silica from coal fly ash, potentially diversifying applications across industries reliant on high‐performance silica materials.

show abstract