JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Jiequan Liu,Ruyi Zhou,Junxia Yu,Li Guo,Xiaodi Li,Chunqiao Xiao,Haobo Hou,Ruan Chi,Guoqing Feng
Potentially toxic elements including lead (Pb), manganese (Mn), and copper (Cu) released from copper tailings would cause severe long-term environmental risks and potential threats to human health. To prevent these negative effects caused by the release of the metals, a novel magnetic carboxyl groups modified bagasse with high adsorption affinity and strong magnetism was synthesized through an in-situ precipitation method and used to simultaneously remove Pb, Mn, and Cu from the eluate of copper tailings. Results showed that release of Pb, Mn, and Cu from the copper tailings was pH, time, and particle size dependent, and maximum concentrations of them released in the eluate was 1.7, 1.9, and 4.1 mg L −1 under weak acid conditions. Batch adsorption experiment showed that the as-synthesized magnetic modified bagasse could selectively absorb Pb, Mn, and Cu from a complex solution with adsorption capacity of 137.3, 13.1, and 90.0 mg g −1 , respectively. X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy-mapping (EDS-mapping) demonstrated that Pb, Mn, and Cu interacted with the magnetic modified biosorbent mainly through coordination and ion exchange. Column experiments showed that higher than 99.5% of the released Pb, Mn, and Cu could be simultaneously removed by the magnetic modified bagasse, and the maximum concentrations of them released in the eluate of the copper tailings were all decreased to lower than 0.01 mg L −1 , which reached the discharge standards. After recycled by a magnet, the magnetic modified bagasse could be collected easily and used repeatedly. Because of the high efficiency and easy recovery, the used method had great practical application value in removal of potentially toxic elements released from metallic tailings.
研究领域:
环境科学
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Wei Xu,Yuyue Zhang,Jun Yan,Zhongfa Chen,Qi Wei,Hongying Wang,Ya Lu
The accumulation of copper tailings not only consumes a significant amount of land resources but also incurs substantial treatment expenses and causes environmental pollution . This article presents an investigation on the feasibility of utilizing ultra-fine copper tailings (CTs), polishing slag (PS), and fly ash (FA) to produce customised high-strength ceramsites for treating and reusing copper tailings. Additionally, the effects of raw material mass ratio and sintering temperature on the physical properties, thermal properties, chemical structure , and expansion mechanism of the high-strength ceramsites were investigated. The experimental results revealed that the well-formed ceramsites exhibited an apparent density of 486–2304 kg/m 3 , a bulk density of 288–1659 kg/m 3 , a 1-h water absorption rate of 0.13–3.9 %, and a particle compressive strength of 0.87–22.4 MPa with copper tailings content of 50∼100 % under preheating temperature 950 ℃ for 40 min and sintering temperature 1195–1225 ℃ for 40 min. The XRD analysis of crystal phases indicated that the mineral compositions of ceramsites contained quartz, anorthite, albite, and mullite . Moreover, the FTIR spectra displayed that [AlO 4 ] and [SiO 4 ] were interconnected into a complementary network which enhanced the strength of ceramsites. Additionally, the microstructure analysis revealed that more evenly distributed and smaller pore structures and rougher matrix were associated with higher compressive strength . The temperature difference between the interior and exterior led to the preferential formation of a slag phase which exerted a bonding effect on the composite feldspar phase. These findings suggest that ultra-finecopper tailings could be recycled in artificial aggregate technology in concrete engineering, and provide theoretical support for the large-scale utilization of tailings.
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
Materials
·
2022
·Vol. 15
·期 13
·4599
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IF 3.748
Jing Li,Lang Yang,Feng Rao,Xiang Tian
Geopolymers have attracted extensive attention in the marine environment because of its special reticulate nanostructure. Gel evolutions of copper tailing-based green geopolymers were studied under air, deionized water, seawater, freeze–thaw cycle and carbonization environments. Their mechanical properties and microstructures were characterized by compressive strength measurement, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM). It was found that the deionized water and natural marine water exposure promoted the evolution degree of geopolymers and improved their compressive strength, while exposure to the carbonization environment weakened the gel evolution and decreased the cross-linking degree of the Sodium aluminosilicate hydrate (N-A-S-H)gel structure, resulting in a decline of compressive strength. The geopolymer exposed in the freeze–thaw cycle exhibited the worst deterioration due to the expansion caused by the crystallization in the geopolymer. These results are essential and beneficial to further understanding the gel formation process in various marine environments and could promote the investigation of green concrete.Keywords:geopolymer;marine concrete;compressive strength;carbonization;corrosion resistance
研究领域:
材料科学
·
海洋工程
✓ 已验证
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
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IF 7.8
Hairong Shen,Jieyi Wang,Mengke Li,Chenquan Ni,Hui Zhong,Zhiguo He
Using peroxymonosulfate (PMS) activation system employing inexpensive solid waste-based catalysts to degrade organic pollutants is a sustainable strategy. In this study, a catalyst derived from copper tailings (CT-BA5) was developed to efficiently activate PMS for aniline aerofloat (AAF) degradation. The micromorphology of copper tailings (CT) was transformed from blocky to porous and loose after the modification, exposing more active sites for PMS activation. The degradation rate constant ( k obs ) of AAF increased to 23.4 times of CT. The degradation efficiency of AAF by CT-BA5/PMS system was 98.79 % within 10 min. The results of XPS, ESR and DFT calculations demonstrated the important roles of Ca 3 Fe 2 Si 3 O 12 and Ov as active sites in the reaction process, which enhanced the electron transfer rate and Fe(II)/Fe(III) valence cycle of the catalyst, thus promoting the generation of reactive oxygen species (ROS). 1 O 2 was the dominant ROS responsible for AAF degradation and preferentially attacked the P-N bond of AAF. Furthermore, the results of cycling experiments and actual flotation wastewater treatment showed CT-BA5 had excellent reusability and practical applicability. In conclusion, this study provides a solution for the development of solid waste-based environmental remediation materials and waste-to-energy treatment, which is expected to be widely used in practical wastewater treatment.
研究领域:
环境科学
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废弃物资源化
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Jinpeng Wang,Qingwen Zhang,Jinxiu Peng,Zhenlun Wei,Yubiao Li,Xiaoyong Wu
Solid waste used as a catalyst to treat wastewater is a feasible solution to achieve “waste treating waste”, but its treatment efficiency needs to be further improved. This study used waste copper tailings (CT) as a catalyst and hydroxylamine (HA) as an intensifier to construct a new type of persulfate-based advanced oxidation process (CT/HA/PS) to achieve continuous and efficient degradation of organic pollutants. The introduction of HA significantly increased the degradation efficiency of organic pollutants in wastewater. Besides, the presence of HA increased the TOC removal efficiency from 32.55% to 68.26%, and the cyclic degradation efficiency increased from 43.7% to 87.41%. Density functional theory (DFT) calculation and experiments together confirmed that HA not only enhanced the adsorption efficiency of CT and the utilization of PS, but also accelerated the Fe(III)/Fe(II) and Cu(II)/Cu(I) cycling on the CT surface, thereby generating more SO 4 - . XPS analysis suggested that the sulfides on CT surface also provided active sites for PS activation. More importantly, the concentration of metal elements leached from CT is negligible and will not cause secondary pollution. Therefore, this research not only proposes a new type of advanced oxidation process that efficiently degrading organic pollutants in wastewater, but also a new possible way of resource utilization and stabilization of tailings.
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
JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Cong Pan,Yan Sun,Yiqie Dong,Haobo Hou,Ming-Feng Kai,Jirong Lan
It is a green and sustainable path to establish cheap solid waste-based catalyst to establish peroxymonosulfate (PMS) catalytic system for the degradation of carbamazepine (CBZ) in water. In this study, durable copper tailing waste residue-based catalyst (CSWR) was prepared, and efficient CSWR/PMS system was constructed for catalytic degradation of CBZ for first time. The morphology and structure of CSWR changed from clumps to porous and loose amorphous by alkali leaching and medium temperature calcination . The reconstructed surface of the CSWR exposes more active sites promotes the catalytic reaction and increases the degradation rate of CBZ by more than 39.8 times. And the CSWR/PMS achieved a CBZ removal of nearly 99.99 % in 20 min. In particular, perovskite-type iron-calcium compounds were formed, which stimulated the production of more HO • and SO 4 •− in the system. DFT calculation shows that CSWR has stronger adsorption energy and electron transfer ability to PMS molecules, which improved the degradation efficiency of the system. In general, this study proposed a means of high-value waste utilization, which provided a new idea for the preparation of solid waste based environmental functional materials and is expected to be widely used in practical wastewater treatment .
研究领域:
环境科学
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废水处理
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催化材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Sciences-Basel
·
2025
·Vol. 15
·期 18
·10228
·
IF 2.5
Guangdong An,Siyang Li,Zhaorui Li,Zhaohui He,Kai Li,Ping Ning,Xiangyu Wang,Xin Sun
This study reports a method for producing translucent concrete using alkali-activated copper tailings, aiming to advance the valorization of solid waste and the development of sustainable construction materials. Under optimal conditions—600 °C calcination, 10 wt% CaO, and a 1:2 water-to-solid ratio—the material achieved a maximum 28-day compressive strength of 52.7 MPa, accompanied by a significantly reduced setting time. Leaching tests indicated that Cu, Zn, Pb, and As concentrations were well below the standard limits, ensuring environmental safety. Further optimization revealed that incorporating 40 wt% cement and 2 wt% polypropylene fibers (1 mm in diameter) provided the best balance between light transmission and mechanical performance. Microstructural analyses (XRD and SEM) confirmed the formation of C–S–H and C–A–S–H gels with minor Ca(OH)2, which densified the matrix and enhanced strength. Despite these promising results, potential variations in the tailing composition and challenges associated with industrial-scale implementation must be considered. Overall, this work elucidates the hydration and solidification mechanisms of copper-tailing-based translucent concrete and highlights its potential for environmentally sustainable and functional construction materials.
研究领域:
建筑材料
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环境工程
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土木工程
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可持续材料
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固废资源化
✓ 已验证
产品关联
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 82
·期 8
·1676-1686
·
IF 1.638
Wang Jinpeng,Zhang Ming,Zhou Runjuan,Li Jiyuan,Zhao Wei,Chen Wenyuan,Zeng Jianping
In this paper, wasted copper tailings (CT) were used to activate persulfate (PS) to degrade azo dye methyl orange (MO). The results show that a large amount of FeS 2 contained in CT can slowly release Fe 2+ in the aqueous solution to activate PS to generate reactive oxygen species to degrade MO. When the dosage of CT and PS was 2 g/L and 3 mM respectively, the MO degradation efficiency of 20 mg/L in the CT/PS system was 96.52% within 60 min. At the same time, it is found that CT has a certain adsorption capacity for MO, and the intra-particle diffusion model can well describe the adsorption process of MO by CT. The effects of related reaction parameters (CT dosage, PS dosage, initial MO concentration and solution pH) on MO degradation in CT/PS system were investigated. Compared with the direct addition of an equal amount of Fe 2+ as in the CT/PS system, for homogeneous activated PS to degrade MO (Fe 2+ /PS), the results showed that the degradation efficiency of Fe 2+ /PS system for MO was lower than that of CT/PS system due to excessive Fe 2+ consumption of . By comparing the Fe 2+ and Fe 3+ concentrations in the two systems, it was found that the CT/PS system could maintain a low Fe 2+ concentration during the reaction process, and the Fe 2+ released by CT could be used by PS to degrade MO more efficiently. The free radical scavenging experiments showed that the reactive oxygen species in the CT/PS system was mainly . This study not only proposed a new CT utilization approach, but also solved the problem of reduced degradation efficiency of organic pollutants caused by excessive Fe 2+ in the Fenton-like reaction. This study provides a new way to utilize the waste copper tailings which are harmful to the environment. It also overcomes the defects of degradation of organic pollutants by Fe 2+ homogeneous activated persulfate to some extent.
研究领域:
环境科学
·
环境工程
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化学工程
·
污染控制
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资源循环利用
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）