Materials
·
2018
·Vol. 11
·期 11
·2133
·
IF 2.467
Xuli Li,Yue Zeng,Fangyuan Chen,Teng Wang,Yixin Li,Yuchi Chen,Haobo Hou,Min Zhou
Zeolite analcime (EMANA) was synthesized through the hydrothermal method by using carbothermal reduction electrolytic manganese residue (CR-EMR). The structural properties of EMANA and CR-EMR were studied using various characterization techniques. After hydrothermal synthesis, the CR-EMR became super-microporous, and the surface area increased by 4.76 times than before. Among the various synthesized zeolites, 6 h-synthesized EMANA was selected as the best adsorbent for macrolide antibiotics in aqueous solution. The adsorption performance of EMANA on the adsorption capacity was examined by using various experimental parameters, such as contact time (0–24 h), initial concentration (50–300 mg/L), temperature (30–50 °C) and pH (3–13). The experimental results were also analyzed by the Langmuir and Freundlich adsorption models, with the latter obtaining better representation. The adsorption process could be described well by the pseudo-second-order model, even under a low concentration (50 mg/L). This result suggests that the adsorption process of macrolide antibiotics is due to chemisorption. According to the Fourier Transform infrared spectroscopy (FT-IR) results, the adsorption of zeolite was mainly due to its hydroxyl group, which played an important role during the adsorption process. Moreover, EMANA is more suitable for treatment of roxithromycin (ROX) than azithromycin (AZM), because ROX has more adsorption sites for the hydroxyl group.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2020
·Vol. 52
·期 1
·314-321
·
IF 2.035
Ren Guoxing,Xiao Songwen,Xia Longgong,Liao Caibin,Liu Zhihong
To obtain fundamental information on the dissolution of cobalt into alumina-saturated MnO-SiO 2 -Al 2 O 3 slags in the smelting reduction of spent lithium-ion batteries, the equilibrium distribution of cobalt between Co-Cu alloys and alumina-saturated MnO-SiO 2 -Al 2 O 3 slags was measured at 1573 K and 1623 K under a controlled CO-CO 2 atmosphere. The results show that (i) the solubility of cobalt in the slag increased with increasing concentration of cobalt in the alloy and increasing oxygen partial pressure in the atmosphere at a fixed concentration of cobalt in the alloy, and (ii) the activity coefficient of CoO in the slag increased with increasing cobalt oxide in the slag. The activity coefficient of CoO in the slag, γ CoO, referred to as solid CoO, can be described as a function of the concentration of CoO in slag as follows: γ CoO = 11.2957(wt pct CoO in slag) + 12.0944 (1573 K, (wt pct MnO)/(wt pct SiO 2 )= 0.76–0.83); γ CoO = 2.2286(wt pct CoO in slag) + 4.5232 (1623 K, (wt pct MnO)/(wt pct SiO 2 )= 0.78–0.85).
研究领域:
冶金学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jirong Lan,Yan Sun,Hong Tian,Wei Zhan,Yaguang Du,Hengpeng Ye,Dongyun Du,Tian C. Zhang,Haobo Hou
Slag backfilling with electrolytic manganese residue (EMR) is an economical and environmentally-friendly method. However, high ammonium-nitrogen and manganese ions in EMRs limit this practice. In this study, a method of highly efficient simultaneous stabilization/solidification of ultrafine EMR by making EMR-based cementitious material (named EMR-P) was proposed and tested via single-factor and response surface optimization experiments. Results show that the stabilization efficiency of NH 4 + and Mn 2+ were above 95%, and the unconfined compressive strength of the EMR-P was 18.85 MPa (megapascal = N/mm 2 ). The mechanistic study concluded that the soluble manganese sulfate and ammonium sulfate in EMR were converted into the insoluble precipitates of manganite (MnOOH), gypsum (CaSO 4 ), MnNH 4 PO 4 ·H 2 O, and struvite (MgNH 4 PO 4 ∙6 H 2 O), leading to the stabilization of NH 4 + and Mn 2+ in the EMR-P. Leaching tests of EMR-P indicated that NH 4 + , Mn 2+ , and others heavy metals in the leachate were within the permitted level of the GB/T8978-1996. The novelty of this study includes the addition of phosphate and magnesium ions to precipitate ammonium-nitrogen and the combination between calcium ions (from CaHPO 4 ∙2 H 2 O) and sulfate (from the EMR) to form calcium sulfate to improve the stability and unconfined compressive strength of cementitious materials (EMR-P).
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xinyue Liu,Yongyu Ren,Zengqi Zhang,Xiaoming Liu,Yaguang Wang
The ammonia nitrogen in electrolytic manganese residue (EMR) is easily transferred to water source, polluting the environment and endangering biological health. In this study, the ammonia nitrogen in EMR is removed by slaked lime, carbide slag (CS) and red mud (RM). The removal of ammonia nitrogen is influenced by the liquid–solid ratio, stirring time, and additives dosage. The removal efficiency of ammonia nitrogen of EMR pretreated with 7.4 % fresh CS for 15 min can reach 98.5 % when the liquid–solid ratio is 1.50. Under the synergistic effect of CS and RM, the ammonia nitrogen in EMR is quickly removed within 15 min, and the removal efficiency of ammonia nitrogen reaches 98.2 %. It is feasible to replace slaked lime with CS and RM to achieve the removal of ammonia nitrogen in EMR. Struvite has high quantity and good purity when the molar ratio of N, P and Mg is 1:1.6:1.6 and pH = 8.0. The remaining EMR after removal of ammonia nitrogen, blast furnace slag, Portland cement and aggregates was used as raw materials to prepare nonsintered bricks (NSB). The NSB according to the optimal formula after curing for 7 days had no free ammonia nitrogen detected. This study provided a new way to remove ammonium nitrogen in EMR by CS and RM, and demonstrated a solution to prepare struvite and nonsintered bricks.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Buildings
·
2024
·Vol. 14
·期 12
·3835
·
IF 3.1
Yang Zheng,Zhi-Yuan Zhang,Yisong Liu,Xiaozhu Zhang,Shaoguo Kang,Leyang Lv,Junbo Zhou
The utilization of silicomanganese slag (SiMnS) as a precursor for alkali-activated materials (AAMs) is considered as an efficient approach for sustainable and eco-friendly large-scale resource utilization. However, sodium silicate solutions account for more than 50% of the production costs and carbon emissions of AAMs. In this study, AAM activators were prepared by silica-containing waste (acid leaching residue of boron mud, BM-AR) and NaOH as raw materials, and were successfully substituted for commercial sodium silicate-NaOH activators. Results indicated that the NaOH dosage had a great effect on the concentration and modulus of the activator. With the appropriate dosage of NaOH (NaOH: BM-AR = 0.4–0.7), suitable moduli of AAM activators can be produced at a wide range of solid/liquid ratios (L/S = 3–4.5) under mild conditions (80–100 °C). The compressive strength of the SiMnS AAM specimens prepared by this activator can reach 68.58 MPa, and its hydration products were mainly hydrated calcium silicate and amorphous silica–alumina gel, indicating the successful preparation of AAM. Calculation showed that the carbon emission of the AAMs prepared in this study was 12.4% and 37.6% of that of OPC and commercial water glass/NaOH-activated AAMs, and the cost was only 67.14% and 60.78% of them. The process achieves the use of waste materials to replace commercial activators, and is expected to be extended to a variety of AAMs raw materials and silica-containing waste. This makes it a highly promising alternative method for the production of AAMs, particularly the ‘just add water’ AAMs.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 6
·1431
·
IF 3.1
Bao Mi,Hui Zhao,Meng Lu,Yi Zhou,Yongjie Xue
The massive stockpiling of electrolytic manganese residue (EMR) has caused serious environmental pollution. In this study, EMR, coal gangue (CG), and fly ash (FA) were used as raw materials to obtain the optimal mix ratio based on Design-Expert mixture design. The effects of activator modulus, liquid–solid (L/S) ratio, and curing temperature on the mechanical properties of geopolymers were investigated. The results showed that the compressive strength of the prepared geopolymer was 12.0 MPa, and the 28d leaching of Mn was 0.123 mg/L under the conditions of EMR:CG:FA = 0.43:0.34:0.23, L/S = 0.9, a curing temperature of 60 °C, and a curing time of 24 h. This indicates that the geopolymer is an environmentally friendly material with high compressive strength. The mineral composition of the geopolymer is mainly hydrated calcium silicate and geopolymer gel. In addition, a more stable new mineral phase, MnSiO3, was generated. The Fourier transform infrared (FTIR) spectrogram showed that the peak at 1100 m−1was shifted to 1112 cm−1, which indicated that a geopolymerization reaction had occurred. Through scanning electron microscopy (SEM) and energy dispersive spectrum (EDS) analysis, it was identified that the geopolymerization produced a large amount of amorphous gelatinous substances with a relatively dense structure, the major elements being oxygen, silicon, aluminum, calcium, and sodium.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Guocan Zheng,Yingchun Zhang,Qinrui Du,Yingxia Zhang,Kehao Wang,Jingxiao Du
Electrolytic manganese residue (EMR) represents a solid waste generated during the production of electrolytic manganese. Under the leaching and dissolution by rainwater, manganese, ammonia nitrogen, and heavy metal ions in EMR can infiltrate into the surrounding environment, thereby disrupting ecological balance and posing threats to human health. This study optimized the leaching conditions for manganese from EMR using ammonium persulfate(APS) through single-factor and orthogonal experiments. It was found that temperature, APS concentration, and reaction time significantly influenced the manganese leaching efficiency. Under leaching temperature of 80°C, leaching time of 3 hours, APS concentration of 30 g/L, and a liquid-to-solid mass ratio of 6 mL/g, a high manganese leaching rate of 88.91 % was achieved in a single process, and significant removal of ammonia nitrogen was observed. After enhanced leaching, the content of organic matter and the total amount of water-soluble salt were 4.10 wt% and 3.11 wt%, respectively. And it meets the requirements of the standard GB 18599–2020 for solid waste entering the class II site in China. Kinetic analysis revealed that the manganese leaching process was controlled by intraparticle diffusion within the solid phase. Mineralogical phase analysis indicated that the primary mineral structures were oxidatively decoupled and disrupted, leading to the dissociation of aggregates, which facilitated the leaching of manganese and ammonia nitrogen. This study provides a practical, green, and economical technological route for the harmless treatment of EMR.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2021
·
IF 7.664
Zhongwei Chen,Guorong Zhang,Changxin Li,Yuan Yu,Tingting Chen,Qingwu Zhang,Juncheng Jiang,Tao Chen
Epoxy resins (EPs) have limited comprehensive applications because of their flammability. This current work combines 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and a ligand of a metal–organic framework with zeolites prepared from electrolytic manganese residue as flame retardants (D-CoZ-BDC-1), which is reported for the first time. The flame retardant EP composite (EP/D-CoZ-BDC-1) exhibited a limiting oxygen index of 31.0%. The peak heat release rate, total heat release, peak smoke release rate, total smoke release, CO yield, and CO 2 yield of EP/D-CoZ-BDC-1 were reduced by 63.4%, 48.9%, 52.8%, 60.1%, 30%, and 48.7%, respectively, when compared with those for EP. The synergistic effects of pyrolysis in the formation of Co 3 O 4 , the phospholipid biphenyl structure, Al 2 O 3 and SiO 2 in the condensed phase, and PO· in the gas phase gave excellent fire resistance. The proposed method not only produced highly efficient EP flame retardants but could also provide ideas for the design of zeolite-based flame retardants for wider applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Jirong Lan,Yan Sun,Ping Huang,Yaguang Du,Wei Zhan,Tian C. Zhang,Dongyun Du
In this study, Electrolytic Manganese Residue (EMR) was treated by EDTA-2Na/NaOH, ultrasonic etching, and hydrothermal reaction to obtain a novel nanocomposite catalyst (called N-EMR), which then was used, together with H 2 O 2 , to treat synthetic textile wastewater containing Reactive Red X–3B, Methyl Orange, Methylene blue and Acid Orange 7. Results indicated that the N-EMR had a nano-sheet structure in sizes of 100–200 nm; new iron and manganese oxides with high activity were produced. The mixture of a small amount of N-EMR (40 mg/L) and H 2 O 2 (0.4 × 10 −3 M) could removal about 99% of azo dyes (at 100 mg/L in 100 mL) within 6–15 min, much faster than many advanced oxidation processes (AOPs) reported in the literature. The elucidation of the associated mechanism for azo dyes degradation indicates that azo dyes were attacked by superoxide radicals , hydroxyl radicals, and electron holes generated within system. N-EMR was found to be reusable and showed limited inhibition by co-existing anions and cations. Moreover, high removal efficiency of azo dyes could happen in the system with a wide range of pH (1–8.5) and temperatures (25–45 °C), indicating that the process developed in this study may have broad application potential in treatment of azo dyes contaminated wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Wentao Li,Qian Zhang,Zuohua Liu,Changyuan Tao,Guocan Zheng,Nanxiong Chen,Dong Wang,Hufei Chen
The long-term accumulation of manganese sulfate residues can lead to the release of soluble manganese ions, thereby contaminating the surrounding environment. Although numerous methods exist to address the issue of soluble manganese ions, current harmless treatment approaches fail to consider the subsequent utilization of manganese slag. This study aims to control the magnetic properties of processed residues by adjusting the addition of barium hydroxide and the reaction duration. Our results reveal that the harmless treatment of manganese sulfate slag is achievable with various amounts of barium hydroxide, and the magnetic properties of the reconstructed slag increase with the increased barium hydroxide dosage. Magnetic separation is employed to separate the magnetic components from the reconstructed slag, and the distribution state of these magnetic substance is modulated by altering the particle size and reagent addition. Under optimal conditions, this study finds that the grade of iron was 24.17 %, the grade of manganese was 8.08 %, and the recovery could reach 79 % for iron and 70 % for manganese. Finally, the fining slag obtained by magnetic separation was utilized as an additive in the preparation of ferrites, reducing the minimum reflection loss of the ferrites to −16.18 dB, signifying up to 90 % electromagnetic wave attenuation. These findings indicate that the fining slags holds great potential as a dopant for ferrites, offering a viable pathway for the resourceful and environmentally friendly treatment of manganese sulfate residues.
研究领域:
环境科学
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材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yigui Tang,Zongsu Wei,Chi Wang,Ping Ning,Minghui He,Shuangyou Bao,Xin Sun,Kai Li
Landfill disposal of manganese slag is a significant environmental concern on both local and global levels. Using manganese slag to synthesis catalysts to degrade organic pollutants in wastewater is a promising pathway for the solid waste treatment. Here, we propose a simple method to prepare magnetic catalysts containing Mn 3 O 4 -Fe 3 O 4 (MMF) using manganese slag as raw materials. The MMF exhibits excellent degradation performance for enrofloxacin (ENR) with 97 % removal efficiency within 30 min and can be rapidly isolated from wastewater by magnet. Electron paramagnetic resonance (EPR) and quenching experiments demonstrated that 1 O 2 produced by the non-radical pathway is the principal active substance for ENR degradation. X-ray photoelectron spectroscopy (XPS) and density-functional theory (DFT) calculations indicate that Mn and Fe in MMF provide electrons for PMS activation and that the presence of Fe promotes the activation of the PMS and the cycling of Mn. This work paves the way for developing magnetic catalysts from manganese slag for the treatment of organic pollutants via advanced oxidation process.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Nannan Song,Zhongwei Chen,Yuan Yu,Boran Yang,Yong Guo,Yanpeng Chu,Tingting Chen,Yuhang Bi,Qingwu Zhang,Chao Feng,Juncheng Jiang
Landfill or open-air stacking of waste electrolytic manganese residue (EMR) poses environmental pollution risks due to the presence of harmful substances. EMR contains SiO 2, Al 2 O 3, and Fe 2 O 3 , which offer resource utilization and flame retardancy potential. A ball milling-based surface treatment strategy was proposed to modify EMR by incorporating red phosphorus (RP) and graphitic carbon nitride (g-C 3 N 4 ), resulting in flame retardant EMR-PCN containing metal phosphides. Adding EMR-PCN to epoxy resin (EP) enhanced the flame retardancy of EP, addressing its inherent fire hazard. The EP composite incorporating 5 wt% EMR-PCN (EP/5EMR-PCN) demonstrated a limiting oxygen index of 33.0% and achieves V-0 level in vertical combustion test. Compared to EP, EP/5EMR-PCN showed significant reductions in peak heat release rate (65.3%), total heat release (62.2%), total smoke production (40.7%), and average CO yield (53.8%). Notably, EP/5EMR-PCN achieves a Flame Retardancy Index of 8.37, outperforming most g-C 3 N 4 -based flame retardants. Besides, increased hydrophobicity optimized the storage of EMR-PCN. Improved compatibility of EMR-PCN with EP enhanced its mechanical properties. Additionally, volume and surface resistance reductions in EP/5EMR-PCN mitigated static cumulative effects, expanding its application potential.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）