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In this study, high pure humic acid (HA) extracted from lignite was fractionated into four fractions according to their molecular weights by the ultrafiltration method. The structural characteristics of various HA fractions were investigated by UV-Vis, FTIR, and 3D fluorescence spectra and 13C/1H-NMR tests. The experiment results showed that the HA fractions with the molecular weight >50 KDa are major, containing 70.89%. The active hydrogen proportion declined from 43.96% to 21.27% with the increase of HA molecular weight, meaning the decrease of the large HA molecules’ acidic group content. On the other hand, 80.93% of the aromatic nucleus content and 12.5% of the alkyl carbon (aliphatic structure) were observed in the large HA molecules that are much higher than those in the small HA molecules. The NMR and spectra studies indicated that the small HA molecules have more acidic groups such as hydroxy, carboxyl. Meanwhile, the large HA molecules have more aromatic and aliphatic structures. The above research indicated that the HA fractions with low molecular weight could provide more active sites for the interaction between HA and iron minerals. Moreover, the carbon chain and aromatic nucleus in the high molecular weight HA fractions could keep the space structure of HA stable.
Manman Lu; Yuanbo Zhang; Zijian Su; Tao Jiang. The NMR and spectral study on the structure of molecular size-fractionated lignite humic acid. Resources, Environment and Sustainability 2020, 2, 100004 .
AMA StyleManman Lu, Yuanbo Zhang, Zijian Su, Tao Jiang. The NMR and spectral study on the structure of molecular size-fractionated lignite humic acid. Resources, Environment and Sustainability. 2020; 2 ():100004.
Chicago/Turabian StyleManman Lu; Yuanbo Zhang; Zijian Su; Tao Jiang. 2020. "The NMR and spectral study on the structure of molecular size-fractionated lignite humic acid." Resources, Environment and Sustainability 2, no. : 100004.
NdFeB permanent magnet scrap is regarded as an important secondary resource which contains rare earth elements (REEs) such as Nd, Pr and Dy. Recovering these valuable REEs from the NdFeB permanent magnet scrap not only increases economic potential, but it also helps to reduce problems relating to disposal and the environment. Hydrometallurgical routes are considered to be the primary choice for recovering the REEs because of higher REEs recovery and its application to all types of magnet compositions. In this paper, the authors firstly reviewed the chemical and physical properties of NdFeB permanent magnet scrap, and then carried out an in-depth discussion on a variety of hydrometallurgical processes for recovering REEs from the NdFeB permanent magnet scrap. The methods mainly included selective leaching or complete leaching processes followed by precipitation, solvent extraction or ionic liquids extraction processes. Particular attention is devoted to the specific technical challenge that emerges in the hydrometallurgical recovery of REEs from NdFeB permanent magnet scrap and to the corresponding potential measures for improving REEs recovery by promoting the processing efficiency. This summarized review will be useful for researchers who are developing processes for recovering REEs from NdFeB permanent magnet scrap.
Yuanbo Zhang; Foquan Gu; Zijian Su; Shuo Liu; Corby Anderson; Tao Jiang. Hydrometallurgical Recovery of Rare Earth Elements from NdFeB Permanent Magnet Scrap: A Review. Metals 2020, 10, 841 .
AMA StyleYuanbo Zhang, Foquan Gu, Zijian Su, Shuo Liu, Corby Anderson, Tao Jiang. Hydrometallurgical Recovery of Rare Earth Elements from NdFeB Permanent Magnet Scrap: A Review. Metals. 2020; 10 (6):841.
Chicago/Turabian StyleYuanbo Zhang; Foquan Gu; Zijian Su; Shuo Liu; Corby Anderson; Tao Jiang. 2020. "Hydrometallurgical Recovery of Rare Earth Elements from NdFeB Permanent Magnet Scrap: A Review." Metals 10, no. 6: 841.
Pyrite cinder is a typical hazardous waste produced in sulfuric acid industry, which, however, contains a significant level of valuable metals, such as iron, copper, cobalt, etc. About 12 million tons of pyrite cinder are generated in China annually, while the utilization rate is less than 50% due to the complex relationship of various components. In this study, a process of phosphoric acid leaching was used to selectively separate and recover Cu, Co and Fe from the pyrite cinder. The effects of different leaching parameters on the recovery rate of valuable metals in phosphoric acid leaching systems were investigated. Under the optimal conditions, the results indicated that the leaching efficiency of copper and cobalt was above 82% and 99%, respectively. More than 98% of iron was transferred into insoluble FePO4·2H2O, which could be used as precursor of battery-grade electrode material after a hydrofluoric acid purification process. Cu and Co in the leaching solutions were extracted efficiently by P204.
Tao Jiang; Yikang Tu; Zijian Su; Manman Lu; Shuo Liu; Jicheng Liu; Foquan Gu; Yuanbo Zhang. A novel value-added utilization process for pyrite cinder: Selective recovery of Cu/Co and synthesis of iron phosphate. Hydrometallurgy 2020, 193, 105314 .
AMA StyleTao Jiang, Yikang Tu, Zijian Su, Manman Lu, Shuo Liu, Jicheng Liu, Foquan Gu, Yuanbo Zhang. A novel value-added utilization process for pyrite cinder: Selective recovery of Cu/Co and synthesis of iron phosphate. Hydrometallurgy. 2020; 193 ():105314.
Chicago/Turabian StyleTao Jiang; Yikang Tu; Zijian Su; Manman Lu; Shuo Liu; Jicheng Liu; Foquan Gu; Yuanbo Zhang. 2020. "A novel value-added utilization process for pyrite cinder: Selective recovery of Cu/Co and synthesis of iron phosphate." Hydrometallurgy 193, no. : 105314.
The Chinese economy is in a critical period of continuous transformation of new and old kinetic energy and economic transformation and upgrading. Copper, the second largest strategic raw material, is still central to China’s economic development. As the major producer and consumer of electrical and electronic equipment (EEE), China’s production and consumption of refined copper is the largest in the world. Thus, it is necessary to forecast the supply and demand of China’s future copper. There is a huge gap between copper production and consumption in China, the current identified copper resources cannot meet copper consumption in the next five years, thus the import of copper will be more crucial for China’s future copper industry. Due to trade frictions, restriction on imports and other reasons, the import of copper from other countries will exist a lot of uncertainties. Hence, the domestic copper waste and scraps could be the suitable secondary resource for recycling copper in China. According to the grade and value of copper scraps, establishing quality standards and optimizing the disassembly process of the domestic Cu-bearing waste & scraps, and using the suitable method are the key to recycling the domestic copper scraps.
Shuo Liu; Yuanbo Zhang; Zijian Su; Manman Lu; Foquan Gu; Jicheng Liu; Tao Jiang. Recycling the domestic copper scrap to address the China’s copper sustainability. Journal of Materials Research and Technology 2020, 9, 2846 -2855.
AMA StyleShuo Liu, Yuanbo Zhang, Zijian Su, Manman Lu, Foquan Gu, Jicheng Liu, Tao Jiang. Recycling the domestic copper scrap to address the China’s copper sustainability. Journal of Materials Research and Technology. 2020; 9 (3):2846-2855.
Chicago/Turabian StyleShuo Liu; Yuanbo Zhang; Zijian Su; Manman Lu; Foquan Gu; Jicheng Liu; Tao Jiang. 2020. "Recycling the domestic copper scrap to address the China’s copper sustainability." Journal of Materials Research and Technology 9, no. 3: 2846-2855.
Pb(II) is a typical toxin in industrial wastewater, which has significant pollution risk for drinking water sources. Magnetic manganese ferrites are a proven recyclable adsorption material on account of their excellent ferromagnetism. In this study, manganese ferrites adsorbent synthesized from ferromanganese ore were used for Pb(II) removal from acid wastewater. Thermodynamic calculation and adsorption tests were conducted. Under optimal conditions, the removal ratio of Pb(II) reached 99.4% when initial Pb(II) concentration was 10 mg/L (pH = 5), and the residual Pb(II) concentration was reduced to lower than 0.1 mg/L. The results indicated that the synthetic manganese ferrites were an excellent magnetic adsorbent, which was easy to be separated and recycled. The adsorption mechanism was explored by isothermal adsorption analysis using φ-pH and ICP.
Jia Wang; Zijian Su; Manman Lu; Juan Wang; Yuanbo Zhang. Pb(II) Removal from Acidic Wastewater by Magnetic Manganese Ferrites Synthesized from Ferromanganese Ores. The Minerals, Metals & Materials Series 2020, 131 -140.
AMA StyleJia Wang, Zijian Su, Manman Lu, Juan Wang, Yuanbo Zhang. Pb(II) Removal from Acidic Wastewater by Magnetic Manganese Ferrites Synthesized from Ferromanganese Ores. The Minerals, Metals & Materials Series. 2020; ():131-140.
Chicago/Turabian StyleJia Wang; Zijian Su; Manman Lu; Juan Wang; Yuanbo Zhang. 2020. "Pb(II) Removal from Acidic Wastewater by Magnetic Manganese Ferrites Synthesized from Ferromanganese Ores." The Minerals, Metals & Materials Series , no. : 131-140.
Pyrite cinder is a typical hazardous waste produced from sulfuric acid industry, which always contains a significant level of valuable metals. About 12 million tons of pyrite cinder are generated in China annually, and the utilization rate is less than 50% due to the complex relationship of various components. In this study, a process of acid leaching was used to separate and recover copper from the pyrite cinder (containing 0.60 wt.% Cu and 56.01 wt.% Fe). Both sulfuric acid and phosphoric acid systems were taken into consideration, and the effect of leaching parameters on the recovery of copper was conducted to investigate the effect of selective leaching in the two acidic systems. The results indicated that the recovery of copper in sulfuric or phosphoric acid system was as high as 89.6 wt.% and 82.3 wt.%, respectively. It was found that part of copper in pyrite cinder closely combined with silicon, which was impossible to separate during the acid leaching process.
Yikang Tu; Zijian Su; Manman Lu; Yuanbo Zhang; Tao Jiang. Separation and Recovery of Copper from Copper-Bearing Pyrite Cinder via an Acid Leaching Process. The Minerals, Metals & Materials Series 2020, 231 -240.
AMA StyleYikang Tu, Zijian Su, Manman Lu, Yuanbo Zhang, Tao Jiang. Separation and Recovery of Copper from Copper-Bearing Pyrite Cinder via an Acid Leaching Process. The Minerals, Metals & Materials Series. 2020; ():231-240.
Chicago/Turabian StyleYikang Tu; Zijian Su; Manman Lu; Yuanbo Zhang; Tao Jiang. 2020. "Separation and Recovery of Copper from Copper-Bearing Pyrite Cinder via an Acid Leaching Process." The Minerals, Metals & Materials Series , no. : 231-240.
As widely used in building materials, blast furnace slag (BFS) has the potential to prepare composite phase change materials (C-PCMs), which can be applied in thermal energy storage field. However, the defects of insufficient porosity and small pore volume of the BFS have severely limited the PCMs adsorption capacity. In this study, the BFS was modified by Ca(OH)2 to improve the PCMs adsorption capacity. The results showed that the porous structure of BFS was significantly improved after modification. And the apertures of BFS were distinctly enlarged and vast irregular slit-shaped pores emerged, which significantly increased the paraffin adsorption capacity. The MBFS could hold about 26.4% paraffin when 10% Ca(OH)2 was added as modifier, which was almost double compared with the BFS. The melting temperature and latent heat of paraffin/MBFS C-PCMs were determined as 51.9 °C and 36.4 J/g. And the prepared C-PCMs could maintain good thermal reliability even after 100 thermal cycles, which presented a potential application in the thermal energy storage fields like building energy conservation and solar energy storage.
Yuanbo Zhang; Jicheng Liu; Zijian Su; Manman Lu; Shuo Liu; Tao Jiang. Preparation of low-temperature composite phase change materials (C-PCMs) from modified blast furnace slag (MBFS). Construction and Building Materials 2019, 238, 117717 .
AMA StyleYuanbo Zhang, Jicheng Liu, Zijian Su, Manman Lu, Shuo Liu, Tao Jiang. Preparation of low-temperature composite phase change materials (C-PCMs) from modified blast furnace slag (MBFS). Construction and Building Materials. 2019; 238 ():117717.
Chicago/Turabian StyleYuanbo Zhang; Jicheng Liu; Zijian Su; Manman Lu; Shuo Liu; Tao Jiang. 2019. "Preparation of low-temperature composite phase change materials (C-PCMs) from modified blast furnace slag (MBFS)." Construction and Building Materials 238, no. : 117717.
Our research group has developed a novel process for synthesizing calcium stannate in a CO–CO2 atmosphere at lower temperature (<1000 °C). The formation behavior of calcium stannate was clarified in previous publications. In this study, the properties of CaSnO3, Ca2SnO4 and Eu-doped Ca2SnO4 synthesized under different atmospheres were further characterized. The results indicated CaSnO3 exhibited good photocatalytic performance in the degradation of Rhodamine B. As a dielectric material, Ca2SnO4 synthesized under CO–CO2 atmosphere had higher dielectric constant and lower dielectric tangent loss compared with that synthesized under air. In addition, the photoluminescence properties of Eu-doped Ca2SnO4 were close to that synthesized under air.
Benlai Han; Zijian Su; Yuanbo Zhang; Bingbing Liu; Manman Lu; Tao Jiang. Characterization on the Properties of Calcium Stannates Synthesized Under Different Atmospheres. The Minerals, Metals & Materials Series 2019, 389 -398.
AMA StyleBenlai Han, Zijian Su, Yuanbo Zhang, Bingbing Liu, Manman Lu, Tao Jiang. Characterization on the Properties of Calcium Stannates Synthesized Under Different Atmospheres. The Minerals, Metals & Materials Series. 2019; ():389-398.
Chicago/Turabian StyleBenlai Han; Zijian Su; Yuanbo Zhang; Bingbing Liu; Manman Lu; Tao Jiang. 2019. "Characterization on the Properties of Calcium Stannates Synthesized Under Different Atmospheres." The Minerals, Metals & Materials Series , no. : 389-398.
Lead (Pb) ions are chronically detected in soil, underground and natural water, there is a need for low-cost in situ remediation techniques. A novel mineral based magnetic adsorbent, consisting of natural vanadium, titanium-bearing magnetite particles coated by humic acid (abbr. VTM-HA), was developed for removing Pb(II) from wastewater. In this study, adsorption-desorption characteristics and mechanisms of Pb (II) on the VTM-HA adsorbent were investigated. The regeneration and reuse feasibility of the VTM-HA adsorbent were also conducted. The adsorption tests further verified that Pb(II) was removed rapidly and efficiently by the VTM-HA adsorbent. Moreover, Pb (II) adsorbed on the VTM-HA adsorbent could be easily eluted using a small amount of acidic eluent, and the desorption of Pb (II) could reach 99.3 wt% in 0.1 M HNO3 (pH = 1). After five adsorption-desorption regeneration cycles, the magnetism and Pb(II) adsorption capacity of the regenerated VTM-HA adsorbent almost kept unchanged. The results indicated that the VTM-HA adsorbent had excellent adsorption capacity and regenerative ability, which could be used as ideal adsorbents for removing Pb (II) from acid wastewater in commercial application. The mechanisms of Pb (II) adsorption and desorption were explored by FTIR, XPS analysis and DFT calculation.
Manman Lu; Yuanbo Zhang; Youlian Zhou; Zijian Su; Bingbing Liu; Guanghui Li; Tao Jiang. Adsorption-desorption characteristics and mechanisms of Pb(II) on natural vanadium, titanium-bearing magnetite-humic acid magnetic adsorbent. Powder Technology 2018, 344, 947 -958.
AMA StyleManman Lu, Yuanbo Zhang, Youlian Zhou, Zijian Su, Bingbing Liu, Guanghui Li, Tao Jiang. Adsorption-desorption characteristics and mechanisms of Pb(II) on natural vanadium, titanium-bearing magnetite-humic acid magnetic adsorbent. Powder Technology. 2018; 344 ():947-958.
Chicago/Turabian StyleManman Lu; Yuanbo Zhang; Youlian Zhou; Zijian Su; Bingbing Liu; Guanghui Li; Tao Jiang. 2018. "Adsorption-desorption characteristics and mechanisms of Pb(II) on natural vanadium, titanium-bearing magnetite-humic acid magnetic adsorbent." Powder Technology 344, no. : 947-958.