ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 47
·71766-71773
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IF 5.19
Huo Junyu,Li Chaoyu,Hu Xiaojin,Xie Huijun,Hu Zhen,Wu Haiming,Liang Shuang,Zhang Jian
Iron ore and manganese ore were used as substrate of constructed wetlands (CWs) to enhance nitrogen (N) removal. However, the N purification performance in CWs filled with iron or manganese ore under antibiotics stress needs further study. In this study, three groups of CWs filled with river sand, limonite (a kind of iron ore), and manganese ore sand were constructed, which were named as C-CWs, Fe-CWs, and Mn-CWs, respectively. The effect and mechanism of the composite antibiotics sulfamethoxazole (SMX) and trimethoprim (TMP) on N removal in CWs were investigated. While the addition of SMX and TMP inhibited about 40% nitrification and promoted about 25% denitrification in all CWs, Fe-CWs and Mn-CWs always had better N removal performance than C-CWs. Changes in microbial community structure in CWs indicated that the better N removal performance in Fe-CWs and Mn-CWs was attributed to the presence of more abundant and diverse N-associated bacteria, especially Fe- and Mn-driven autotrophic denitrifying bacteria. What’s more, the addition of iron ore or manganese ore contributed to the better N removal performance with highest relative abundance of N-transferring bacteria under antibiotics stress.
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
Journal of Water Process Engineering
·
2024
·
IF 6.3
Jingze Hu,Qingji Wang,Yuxian Wang,Qinghong Wang,Zhuoyu Li,Chunmao Chen
Natural minerals show potential for catalytic ozonation in industrial wastewater treatment . In this study, the efficiencies and mechanisms of two natural iron ores in catalytic ozonation processes (COPs) for aqueous nitrobenzene degradation were initially investigated. Compared with single ozonation process, the removal of TOC increased by about 60 % and 35 % in COPs with natural magnetite and pyrite, respectively. Both natural magnetite and pyrite could promote O 3 decomposition to form hydroxyl radicals and 1 O 2 . But the inner reaction pathways were different. The natural magnetite facilitated O 3 decomposition through the Lewis acids and the electron transfer between Fe(II)/Fe(III) on the catalyst surface, while electron transfer was the only pathway for O 3 decomposition by natural pyrite. Continuous flow fixed-bed reactor was adopted to provide better simulation of the practical operation conditions, so that the potential of engineering application could be evaluated. The natural magnetite exhibited excellent catalytic activity and stability during long period continuous operation in fixed-bed reactor. The removal of TOC maintained at 81.9 % under the optimized operating parameters of hydraulic retention time (2.84 h), O 3 velocity (0.25 L min −1 ) and O 3 concentration (30 mg L −1 ). HCO 3 − and PO 4 3− obviously inhibited the TOC removal efficiencies through radical scavenging and surface –OH occupying. While low concentration of Cl − and SO 4 2− showed negligible effect on the mineralization of aqueous nitrobenzene. After the continuous operation for 672 h, the removal of TOC for nitrobenzene solution in the magnetite-COP system was still stable at about 80 %. The present study demonstrated the engineering application prospect of the natural iron ores in catalytic ozonation treatment of recalcitrant chemical wastewaters.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Nan Fang,Qiang He,Long Sheng,Yanhua Xi,Liping Zhang,Hongwei Liu,Huicai Cheng
Norfloxacin , a kind of antibiotic frequently detected in environments, represents a group of non-persistent organic pollutants with latent risks to the ecosystem. Iron ore waste, generated and accumulated in large quantities from the iron/steel industry, was evaluated as a potential sorbent for norfloxacin removal. Kinetics analysis showed that the adsorption process reached equilibrium at 72 h, and the adsorption process could be best defined by the pseudo-second-order kinetics with the primary mechanism of norfloxacin adsorption suggested to be cation exchange. Further, adsorption of norfloxacin to iron ore waste was shown to be facilitated by the pH range of 2–10, low cation concentration, and low temperature, which are characteristic of natural surface waters , suggesting the potential of practical applications in aquatic environments. These findings provide new insight into the potentials of beneficial reuse for iron ore waste in the adsorptive removal of environmental pollutants.
研究领域:
环境科学
·
污染控制
·
材料科学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Xiaoxiao Qiao,An Liu,Zhihong Li,Jinchuan Fan,Canjin Luo,Panpan Fan,Yizhou Liu,Minqiang Fan
A novel combined reagent dodecylamine (DDA)–2-octanol–kerosene was employed to overcome the problems associated with DDA, that is, DDA has a high freezing point and needs to be acidified with hydrochloric or acetic acid when it is used for flotation. The analysis of the basic physical properties of the agent showed that DDA–2-octanol–kerosene had significant advantages in freezing point and dispersibility and its freezing point can be reduced to below 0 °C. From the flotation results of magnetite, it can be seen that DDA–2-octanol–kerosene has a better selectivity. Response Surface Methodology based on a three-level, three-variable Box–Behnken design (BBD) was employed to define the quadratic relationship between the recovery of quartz and the composition of the mixed agent. The results indicated that the recovery of quartz increased with the increase of DDA or 2-octanol dosage, however, kerosene had a marginal positive effect on the recovery of quartz when the amount of kerosene was less than 0.76 times that of DDA and otherwise a negative effect. This study provides a new method and technical support for its industrial application for the reverse flotation of iron ore for the combination of agents in the field of iron ore flotation. And allows for a deeper macro-level understanding of the interaction between the DDA–2-octanol–kerosene ternary mixed agents.
研究领域:
矿物加工工程
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 11
·1345
·
IF 4.501
Tingting Tian,Xinfeng Zhu,Zhongxian Song,Xindong Li,Jinhui Zhang,Yanli Mao,Junfeng Wu,Wei Zhang,Chaohai Wang
Iron-based catalysts are widely used in water treatment and environmental remediation due to their abundant content in nature and their ability to activate persulfate at room temperature. Here, eggshell biochar-loaded natural iron slag (IO@ESBC) was successfully synthesized to remove tetracycline hydrochloride (TCH) by activated persulfate. The morphology, structure and chemical composition of IO@ESBC were systematically characterized. The IO@ESBC/PS process showed good performance for TCH removal. The decomposition rate constant (k) for IO@ESBC was 0.011 min−1and the degradation rate was 3690 mmol/g/h in this system. With the increase of PS concentration and IO@ESBC content, the removal rate of TCH both increased. The IO@ESBC/PS process can effectively remove TCH at pH 3–9. There are different effects on TCH removal for the reason that the addition of water matrix species (humic acid, Cl−, HCO3−, NO3−and HPO42−). The IO@ESBC/PS system for degrading TCH was mainly controlled by both the free radical pathway (SO4•−, •OH and O2•−) and non-free radical pathway (1O2). The loading of ESBC slows down the agglomeration between iron particles, and more active sites are exposed. The removal rate of TCH was still above 75% after five cycles of IO@ESBC. This interesting investigation has provided a green route for synthesis of composite driving from waste resources, expanding its further application for environmental remediations.Keywords:iron ore;eggshell biochar;tetracycline hydrochloride;persulfate-based advanced oxidation
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
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Linlin Gong,Xue Hua,Bingxue Yao,Jinsheng Liang,Guangyan Tian
Iron ore tailings (IOTs) are in urgent need of utilization. Here, a series of novel red composite pigments with bright color (L* = 42.6, a* = 35.3, and b* = 25.7) and high thermostability (1000 °C) was prepared from IOTs. The composite pigment was mainly compounded by α-Fe 2 O 3 , quartz, and anorthite, and it exhibited an ellipsoidal morphology. Thereinto, α-Fe 2 O 3 was derived from the hydrolysis of Fe 3+ ions, and quartz and anorthite were collected as the residue minerals of IOTs after the synthesis reaction . The presence of IOTs exposed more (1 0 4) crystal planes of α-Fe 2 O 3 and doped Al elements in the crystals, resulting in the bright red color of the synthesized pigments. The presence of quartz and anorthite endowed the synthesized pigments with excellent thermal resistance, enabling their preferential decomposition under the action of heat and protecting the composite pigments from any significant changes in color.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lu Chen,Chao Wang,Wenjie He,Haibo Li,Zhihong Ye,Yin Xu
The seek for efficient and low-cost heterogeneous catalysts for peroxymonosulfate (PMS) activation holds great promise in the treatment of organic contaminants. Natural iron ore (IO) has been identified as a potential catalyst due to its low environmental risk and cost-savings. Herein, the commercial tungsten sulfide (WS 2 ) was employed to significantly enhance the performance of IO towards PMS activation (WS 2 /IO/PMS) for the removal of pollutants. This system demonstrated remarkable performance, with >98.2% removal of organic pollutants in 60 min, including dyes and antibiotics, under the optimized conditions of 0.50 g/L IO, 0.10 g/L WS 2 , 2.0 mM PMS, and initial pH 6.0. The apparent degradation rate constant ( k ) of Acid Orange 7 (AO7) in WS 2 /IO/PMS system (0.073 min −1 ) was about 30.4-fold and 104.3-fold higher than that of in WS 2 /PMS system (0.0024 min −1 ) and IO/PMS system (0.0007 min −1 ), respectively. Mechanism insights revealed the crucial role of WS 2 in boosting the degradation kinetics in the WS 2 /IO/PMS system. The exposed W 4+ or S 2− species on WS 2 surface were the dominant reactive sites responsible for the promotion of Fe 3+ /Fe 2+ redox cycles and subsequently the PMS activation. Importantly, the electrochemical analysis demonstrates that the iron ions released from IO were prone to adsorb onto the WS 2 surface, forming active Fe species with high oxidative potential, which remarkably accelerated the electron transfer for Fe 2+ regeneration, thereby enhancing PMS activation to generate reactive oxygen species like hydroxyl radicals ( OH), sulfate radicals (SO 4 − ) and superoxide radicals (O 2 − ). Furthermore, the practicability of WS 2 /IO/PMS system was validated by treating various pollutants and investigating the interference of coexisting anions in water. Overall, this study provides a green and advanced strategy to enhance the PMS activation by natural iron ore for efficient water decontamination.
研究领域:
环境科学
·
催化化学
✓ 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）