PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Wencheng Hou,Wentao Guo,Xiangjun Liu,Zhuoyang Li,Hongxia Li
Desulfurized gypsum, a byproduct of industrial processes, can be efficiently recycled through solid-phase reaction to synthesize CaFe 2 O 4 . This study investigates the reaction mechanism of CaFe 2 O 4 formation from CaSO 4 , Fe 2 O 3 , and semi-coke powder using thermodynamic modeling with Factsage 8.3 software. The phase composition and microstructure of the resulting products under varying semi-coke contents and sintering temperatures were characterized using X-ray diffraction (XRD) and scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM-EDS). Total Fe and S contents were quantified using inductively coupled plasma optical emission spectroscopy (ICP-OES) and a C/S Analyzer. The results indicate that increasing the semi-coke content from 11.11 wt% to 20.00 wt% leads to an initial rise and subsequent decline in CaFe 2 O 4 yield, while S content exhibits an opposite trend. Similarly, elevating the sintering temperature from 1050°C to 1150°C results in increased CaFe 2 O 4 formation up to 1125°C, beyond which a decrease is observed, alongside a continuous reduction in S content. Optimal synthesis conditions were identified at 15.79 wt% semi-coke and 1125°C, achieving a desulfurization rate of 95.40 % and confirming effective formation of CaFe 2 O 4 . Compared to conventional reducing agents such as coke and C powders, the use of semi-coke enabled a reduction in the required sintering temperature from 1150°C to 1125°C. These results provide a valuable reference for the low-temperature, high-efficiency recycling of desulfurized gypsum into functional ferrite materials.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 39
·18839-18847
·
IF 3.925
Hongxia Chen,Haiyan Yan,Peiyu Cao,Yufeng He,Pengfei Song,Rongmin Wang
Semicoke (SC) is a kind of powder of industrial by-products that easily cause environmental pollution due to the presence of stable organic matter in clay minerals. In this work, a porous magnetic semicoke-based geopolymer (MSC-GP) was prepared using SC as the raw material. Then, 2-methyl-4-chlorophenoxyacetic acid (MCPA), a typical herbicide, was loaded into the porous MSC-GP and composited with sodium alginate (SA) using calcium as a crosslinking agent, which afforded MSC-GP/SA encapsulating MCPA (MCPA@MSC-GP/SA). The structure and micromorphology of SC, SC-GP and MCPA@MSC-GP/SA were characterized by FT-IR spectroscopy, TG-DTG, SEM and EDS. After measuring the swelling behavior in water and saline solutions, the water retention capacity, pH effect, degradation efficiency, site-specific targeted release, recovery, slow-release behavior, and pot experiments of MCPA@MSC-GP/SA were assessed. This indicated that the water retention capacity of soils was improved by the addition of MCPA@MSC-GP/SA. The release rate of the herbicide in MCPA@MSC-GP/SA was 65.2% in 90 days, which indicated that MCPA@MSC-GP/SA possessed a higher utilization efficiency and control of weeds compared to traditional herbicide. In summary, this study opens up a new avenue for improving the utilization efficiency of SC and prolonging the duration of herbicide action, which may have potential applications in agricultural production.
研究领域:
环境科学
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 19
·4633
·
IF 4.2
Yan-Fang Li,Li-Fang Wang,Shu-Juan Gao,Tan-Lai Yu,Qi-Feng Li,Jun-Wei Wang
A Co-doped porous carbon was successfully fabricated by a facile carbonizing procedure using coal hydrogasification semi-coke (SC) as the carbon and cobalt nitrate as the magnetic precursors, respectively. The mass ratio of the precursors was changed to regulate the microwave absorption (MA) capabilities. The favorable MA capabilities are a result of a synergistic interaction be-tween the dielectric loss from the carbon framework, the magnetic loss from nano-sized Co particles, and multiple scattering from the residual pores. At a thickness of 4.0 mm, the Co/C composite showed the lowest reflection loss of −33.45 dB when the initial mass ratio of cobalt nitrate and SC was 1:1. The effective absorbing bandwidth (EAB) could achieve 3.5 GHz at 2 mm thickness. This work not only opens up a new avenue for the facile fabrication of dielectric and magnetic loss combinations and their structural design, but it also creates a new route for the high value-added exploitation of SC.
研究领域:
材料科学
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能源与环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science-Processes & Impacts
·
2015
·Vol. 17
·期 12
·2022-2033
·
IF 2.171
Tiantian Shen,Yongrui Pi,Mutai Bao,Nana Xu,Yiming Li,Jinren Lu
The efficiencies of free and immobilized microbial consortia in the degradation of different types of petroleum hydrocarbons were investigated. In this study, the biodegradation rates of naphthalene, phenanthrene, pyrene and crude oil reached about 80%, 30%, 56% and 48% under the optimum environmental conditions of free microbial consortia after 7 d. We evaluated five unique co-metabolic substances with petroleum hydrocarbons, α-lactose was the best co-metabolic substance among glucose, α-lactose, soluble starch, yeast powder and urea. The orthogonal biodegradation analysis results showed that semi-coke was the best immobilized carrier followed by walnut shell and activated carbon. Meanwhile, the significance of various factors that contribute to the biodegradation of semi-coke immobilized microbial consortia followed the order of: α-lactose > semi-coke > sodium alginate > CaCl2. Moreover, the degradation rate of the immobilized microbial consortium (47%) was higher than that of a free microbial consortium (26%) under environmental conditions such as the crude oil concentration of 3 g L−1, NaCl concentration of 20 g L−1, pH at 7.2–7.4 and temperature of 25 °C after 5 d. SEM and FTIR analyses revealed that the structure of semi-coke became more porous and easily adhered to the microbial consortium; the functional groups (e.g., hydroxy and phosphate) were identified in the microbial consortium and were changed by immobilization. This study demonstrated that the ability of microbial adaptation to the environment can be improved by immobilization which expands the application fields of microbial remediation.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CANADIAN METALLURGICAL QUARTERLY
·
2023
·
IF 0.9
Tingting Lv,Luyao Kou,Tu Hu,Libo Zhang,Li Yang
The use of semi-coke instead of anthracite coal for blast furnace injection to reduce ironmaking costs is becoming increasingly popular. To optimise the usage of semi-coke, it is essential to investigate the mixed combustion of semi-coke and bituminous coal. Within this study pulverised coal combustion was analysed using a thermogravimetric analyser. The results showed that the proportion of semi-coke in the mixed pulverised coal did not exceed 30%. However, 1 wt-% La2O3 as a catalyst increased the proportion of semi-coke by 15%. In addition, the kinetics of combustion of pulverised coal was investigated using the Flynn Wall Ozawa method and the catalyst reduced the activation energy of the reaction. The average activation energy decreased from 84.24 KJ/mol to 74.59 KJ/mol, especially at a conversion of 0.4, with a maximum reduction of 17.3%. Overall, La2O3 is an effective catalyst to increase the utilisation of semi-coke for practical industrial applications.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ping Dong,Yong-hui Song,Lei Wu,Ya Wang,Ning Yin,Yi-fan Wang,Yi-fan Li
In this study, the persulfate and cyanide tailings (PS-CTs) were used for the synergistic treatment of semi-coke wastewater to achieve advanced oxidation and in-situ coagulation removal of organics in semi-coke wastewater. The effects of persulfate concentration, reaction temperature, cyanide tailing concentration and initial pH on chemical oxygen demand (COD) removal efficiency were investigated, and the synergistic mechanism in the treatment process was further explored. The results showed that the removal efficiency of COD in semi-coke wastewater was 94.49 % under the conditions of persulfate concentration 0.025 mol/L, reaction temperature 60 °C, cyanide tailings concentration 5 g/L, the initial pH value of 3. The results of the mechanistic analysis showed that in PS-CTs system, pyrite was oxidized by persulfate. The dissolved Fe 2+ activated the persulfate to produce SO 4 − and OH and generated Fe 3+ in situ. The hydrolysis of Fe 3+ produced a series of complex ions and amorphous iron hydroxides, which could remove some organics by adsorption and sweeping netting. The organics in semi-coke wastewater were effectively removed by the combined effect of oxidation and coagulation. In addition, the PS-CTs system also achieved the oxidative de-cyanidation of cyanide tailings simultaneously, and the total cyanide concentration of treated cyanide tailings was 8.21 mg/kg, and the leaching cyanide concentration was 0.12 mg/L, which was in line with the emission standards. This process implemented the concept of “treating waste with waste”, and provided theoretical support for the treatment of semi-coke wastewater and other organic wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Linjiang Zhang,Xiaohui Xu,Jie Feng,Bo Bai,Na Hu,Honglun Wang
Solar steam generation as a green and sustainable technology has recently attracted significant interest for relieving the longstanding challenge of clean water resources. However, the large-scale preparation of low cost photothermal materials for solar steam generators is highly desired yet still challenging. Herein, semi-coke (SC), a solid byproduct of coal industrial, was first demonstrated as an efficient photothermal material and successfully applied in solar steam generation system by depositing SC on melamine sponge with the assistance of polydopamine. Then, the modified melamine sponge was functionalized by hydrophobic methyl trichlorosilane to fabricate the self-floating semi-coke/polydopamine@photothermal melamine sponge (SPMS). Based on their outstanding light absorption, good wettability , and effective thermal location, the SPMS performs a high evaporation rate of 1.41 kg m −2 h −1 with a solar thermal conversion efficiency of 90.56% under 1 sun irradiation. Meanwhile, the SPMS has remarkable cycle stability and water purification abilities for seawater , dyeing wastewater and heavy metal solution. By turning “waste” to “wealth”, the SPMS shows great potential for sustainable applications in synergetic solar clean water production.
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
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Huaqi Zhang,Siyi Chen,Zhenhao Wang,Chaoran Fan,Tianming Li,Na Yan,Yian Zheng
Semi-coke (SC), a solid waste generated from the dry distillation of oil shale, is rich in organic matter, classifying it as a functional carbon-based material. Combining the progressive advantages of functionalized carbon-based materials in advanced oxidation technology, this study prepared Fe-N co-doped semi-coke (Fe-N-SC) through a facile one-step pyrolysis of SC pre-impregnated with potassium ferricyanide. Under visible light (VIS) irradiation, Fe-N-SC was able to activate periodate (PI) to establish an Fe-N-SC/PI/VIS system for degrading norfloxacin (NOR). The results showed that this system achieved 99.5%-NOR removal, with a mineralization degree of up to 68.6%- within 30 min. Furthermore, Fe-N-SC exhibited stable performance over a wide pH range (3−9) and maintained high NOR removal efficiency in real water matrices, indicating its robustness and practical applicability. Electron paramagnetic resonance and free radical quenching experiments revealed that h + and ·OH were the primary species responsible for NOR degradation in Fe-N-SC/PI/VIS system. The proposed mechanism involved reactive oxygen species-driven oxidative cleavage of piperazine ring in NOR, leading to its stepwise breakdown and mineralization into harmless end-products. During the degradation process, no toxic intermediates were detected, highlighting the environmental safety of Fe-N-SC/PI/VIS system for sustainable and highly effective removal of antibiotics from aquatic environment.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Yanfang Li,Xiaoyun Li,Maoqing Kang,Yuhua Zhao,Qifeng Li,Junwei Wang
A series of microwave absorbers (SFs) were prepared using coal hydrogasification semi-coke as the carbon and ferric nitrate as the magnetic precursors. The absorbers were then incorporated to waterborne polyurethane to prepare composites (WSF). The microwave absorption performance of the composites can be tuned by adjusting the annealing temperature of the hybrids. The composite films can be fabricated to gradient or homogeneous structures by a facile viscosity-controlling method. The film with gradient structure is more conducive to alleviating the impedance mismatch and enhancing the attenuation. The WSF700 composite with gradient structure performs favorable MA property, with the minimum reflection loss of −42.08 dB and effective absorption bandwidth of 6.78 GHz at a thickness of 1.7 mm. The preparation strategy is rather facile, and the ingredients are inexpensive and easily accessible. This work shows great potential for the applications of the composites in MA coatings and flexible electronics.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xianjie Wang,Yufei Wang,Long Yan,Qin Wang,Jian Li,Xiang Zhong,Qianqian Liu,Qingchao Li,Shuo Cui,Gang Xie
Heteroatom-doped porous carbon has attracted enormous attention in fabricating high-performance supercapacitors . However, designing heteroatoms containing carbon materials through an eco-friendly and cost-effective route remains challenging. In this work, N-O-S self-doped porous carbon materials are prepared from semi-coking wastewater-based phenolic resin (SWPR) via a simple Na 2 CO 3 activation strategy. The abundant phenols , NH 4 + , and SO 4 2- in semi-coking wastewater endows the versatile N, O, and S doping in porous carbon material, remarkably enhancing its conductivity. The optimal SWPR-700–2.5 porous carbon material is obtained at an activation temperature of 700 °C and a mass ratio of 2.5:1 for SWPR: Na 2 CO 3 . The symmetrical supercapacitor is assembled with SWPR-700–2.5, exhibiting a high specific capacitance of 170.5 F g −1 at 0.5 A g −1 , with a high energy density of 5.92 Wh kg −1 at 124.9 W kg −1 . After 10,000 cycles, the Coulombic efficiency and capacity retention are 100% and 99.4%, respectively, at a current density of 20 A g −1 . The excellent performance of SWPR-700–2.5 based capacitor is attributed to the porous structure with a large specific surface area (718 m 2 g −1 ) and abundant N-O-S self-doping (2.739 at% N, 8.627 at% O and 1.378 at% S). This study provides a simple route to prepare N-O-S self-doped porous carbon for supercapacitors and pushes forward the advancement of semi-coking wastewater treatment.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Meng-Ting Sun,Zhi-Man Yang,Xiao-Lei Fan,Fei Wang,Rong-Bo Guo,Dong-Yan Xu
Methane is a greenhouse gas with significant global warming potential. The methane-oxidizing bacteria (MOB) immobilized on biocarrier could perform effectively and environmentally in methane elimination. To further improve the efficiencies of MOB immobilization and methane elimination, the surface biocompatibility of biocarrier needs to be improved. In this work, the oil shale semicoke (SC) was chemically modified by sodium p-styrenesulfonate hydrate (SS) and 2-(methacryloyloxy)ethyltrimethylammonium chloride (DMC) to promote surface hydrophilicity and positive charge, respectively. Results revealed that, under methane concentrations of ~10% (v/v) and ~0.5% (v/v), the MOB immobilized on semicoke modified with 1.0 mol L −1 of SS permitted improved methane elimination capacities (ECs), which were 15.02% and 11.11% higher than that on SC, respectively. Additionally, under methane concentrations of ~10% (v/v) and ~0.5% (v/v), the MOB immobilized on semicoke modified with 0.4 mol L −1 of DMC held superior ECs, which were 17.88% and 11.29% higher than that on SC, respectively. The qPCR analysis indicated that the MOB abundance on modified semicoke were higher than that on SC. In consequence, the surface biocompatibility of semicoke could be promoted by SS and DMC modifications, which potentially provided methods for other biocarriers to improve surface biocompatibility.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Jiani Qin,Huannan Wu,Yanli Dong,Fangxin Zhan,Miao Liao,Bao Pan,Chuanyi Wang
The porous semi-coke activated carbon (SAC) was derived from solid waste semi-coke (SC) powder by an activation process. Subsequently, a highly efficient photocatalyst (SAC/CN) was prepared by loading SAC onto carbon nitride (CN). The SAC/CN composite exhibited an increased surface area, well-dispersed layered CN, abundant delocalization electrons, redshift in light absorption, and a more negative conduction band (CB) edge. The optimal 0.7 %SAC/CN 600 sample exhibited the highest H 2 production rate of 12.86 mmol·h −1 ·g −1 , which is 8.0-fold higher than that of pristine CN. The SAC/CN photocatalysts also demonstrated excellent stability and reusability. Photoluminescence (PL) and electrochemical measurements indicated enhanced charge separation/transfer efficiency in the SAC/CN composite. These findings propose a novel approach for recycling of coal chemical solid waste coupled with CN photocatalysts to achieve efficient solar-to-chemical energy conversion.
研究领域:
材料科学
·
能源化学
✓ 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）