HYDROMETALLURGY
·
2022
·
IF 4.217
Zhihe Cao,Baozhong Ma,Chengyan Wang,Bingding Shi,Yongqiang Chen
Currently, with the increasing demand of nickel and cobalt, more and more attention has been placed on hydrometallurgical processing to treat laterite ore. The nitric acid pressure leaching (NAPL) has several advantages. In order to solve the problems of environmental pollution and resource wastage caused by the NAPL residue, this work proposes a novel and green process for treating laterite residue to prepare high-purity iron phosphate. The laterite residue was subjected to selective leaching by 6.0 mol L −1 phosphoric acid . The pregnant leach solution (PLS) was used to prepare iron phosphate by induced precipitation. The selective leaching was conducted using 6.0 mol L −1 H 3 PO 4 of to obtain high extraction of iron. After leaching and clarification of PLS iron phosphate was precipitated in two steps by controlling temperature and pH, to yield more than 94% iron phosphate. The reaction mechanism of the induced precipitation was analyzed, which illustrated that intermediate products were first formed from the leach liquor and then transformed to FePO 4(s) . Characterization of the iron phosphate showed that the product displayed flowerlike morphology with high purity and dispersion. This process not only solves the serious environmental damage by accumulation and landfill of laterite residue, but also improve the efficiency of resource utilization for the hydrometallurgical nickel laterite industry.
研究领域:
冶金学
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材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Chen Huang,Ying Zhang,Shuofan Li,Quan Shi,Suoqi Zhao,Linzhou Zhang
With the escalating global energy crisis and burgeoning environmental concerns as a result of the accumulation of used lubricating oil, the urgency and economic potential of recycling this waste is undeniably critical. Conventional methods, such as distillation and hydrogenation, often stumble upon operational difficulties as a result of thermochemical decomposition, while advanced procedures, like molecular distillation and membrane separation, face industrial scale-up, owing to prohibitive costs and limited separation capabilities. Herein, this study heralds the emergence of supercritical CO2 (SC-CO2) extraction, which can exemplify superior efficacy in addressing these concerns. Leveraging the high solvency under extreme pressure and low-temperature conditions, SC-CO2 can selectively separate undesirable components, reducing coke formation and simplifying subsequent refining stages. The comprehensive analysis, conducted using gas chromatography–mass spectrometry and high-resolution mass spectrometry, revealed the selectivity of SC-CO2 toward saturates with a smaller molecular weight. On the basis of this analysis, the optimal extraction condition was determined. Implementing a two-stage process at 70 °C and 10–20 MPa, we effectively eradicated residual small molecules and large polar compounds, yielding an intermediate fraction rich in isoparaffins and 1–4 ring naphthenes with a carbon distribution of C25–40. Notably, the recovery rate of saturates was 60%. Critically, the removal rate of undesirable components in recycled lubricating oil is remarkably high, reinforcing the practical viability and exceptional advantages of SC-CO2 extraction for lubricating oil recycling as a sustainable and economically rewarding solution to pressing global energy and environmental predicaments.
研究领域:
化学工程
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环境科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Huan Wang,Hui Zhang,Dagan Zhang,Jie Wang,Hui Tan,Tiantian Kong
Excessive urea causes poor stress resistance in plants as well as severe environmental issues . In this work, novel structural color hydrogel particles that can degrade and detect urea simultaneously were developed. Inverse opal hydrogel particles (IOHPs) with abundant carboxyl groups and immobilized urease were used. The particles could hydrolyze urea in a solution to determine the concentration of urea. Moreover, because the detection and elimination relied on specific enzyme catalysis and the pH responsiveness of the sensors, the particles displayed high specificity and sensitivity. When the proper ratio of crosslinker and monomer was chosen, the IOHP sensors responded to the urea solution with a concentration range of 0–30 mM and exhibited a linear range of 1–5 mM with a detection limit of 0.48 mM, which matched the actual demands. The IOHP sensors were applied to practical samples, and it was demonstrated that the recoveries reached ideal percentages of 94.7%–102%. All the results indicate that IOHP sensors are promising for opening a new route for the detection and elimination of urea.
研究领域:
生物技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2021
·
IF 6.475
Lisha Xie,Qiang Zeng,Qingya Li,Shurong Wang,Linhong Li,Zhenyu Li,Fangyang Liu,Xiaojing Hao,Feng Hao
Lead is widely used as a crucial elemental for lead acid batteries (LABs) and emerging halide perovskite solar cells (PSCs). However, the use of soluble lead will raise environmental concerns. For the purpose of Pb recycling, herein, we report a reactant-recycling strategy to extract Pb from used LABs and synthesize high-purity PbI2. The recycled PbI2 shows smaller grain size, higher crystallinity, and higher thermal stability compared to the commercial sources. Perovskite films deposited with the high-quality PbI2 show larger grain size and fewer defects than the commercial ones. Consequently, the synthesized PbI2 enables a power conversation efficiency of 20.45% for the inverted MAPbI3 (MA= methylammonium) PSCs with excellent air stability. This work offers a novel strategy for lead recovery from LABs and a green path for the realization of high-performance PSCs with high defect tolerance.
研究领域:
材料科学
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环境科学
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能源技术
·
纳米技术
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Shuainan Ni,Qianwen Chen,Yun Gao,Xiangguang Guo,Xiaoqi Sun
Unlike the classic separation technologies, an extraction-precipitation strategy has been developed for the recovery of rare earth (RE) and from industrial wastewater using a novel phenoxycarboxylic acid of 2-(4-butoxyphenoxy) acetic acid (BPAA). Compared with 4-(4-butoxyphenoxy) butanoic acid (BPBA) and 2-(4-(benzyloxy) phenoxy) acetic acid (BZAA), BPAA enabled minimal reagent/equipment/energy uses in each step of the sustainable process. It was successfully used to enrich REEs with the concentration of 159 mg/L, and the enrichment factor of 189 times was reached. The formed precipitate sizes were bigger than the REEs precipitates from industrial precipitants, i.e., oxalic acid , ammonium hydrogencarbonate, CaO and MgO, which could be settled quickly within 1 min. Compared with COD value of 432 mg/L and 725 mg/L in traditional liquid-liquid extraction using P507 and NA, the COD value of 45 mg/L from BPAA using extraction-precipitation strategy were much lower. It is worthwhile mentioning that BPAA has revealed some advantages in the extraction-precipitation process, i.e., higher efficiency, larger processing capacity, lower energy consumption and simple process. The extraction-precipitation strategy may be suitable for large-scale applications.
研究领域:
环境科学
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化学工程
·
资源回收
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 22
·52268
·
IF 3.057
Zhixiang Cui,Yue Fan,Xiaolong Liu,Junhui Si,Qianting Wang
Nowadays, the environmental problems caused by industrial oily wastewater and offshore oil leakage are becoming more and more serious. Here, the 3-D porous polyurethane/deacetylated acetate cellulose (TPU/d-CA) composite foam with outstanding mechanical property and oil/water separation performance was successfully prepared. The morphology, wettability, mechanical properties, and oil/water separation performances had been systematically studied. The results showed that TPU/d-CA composite foam could be used as water and oil removing material, respectively, for a series of oil/water mixture only under gravity force, due to its lipophilicity and hydrophilicity. It has high-separation flux, which can reach up to 43,000 L/m 2 ·h and 85,000 L/m 2 ·h for water and oil, respectively and all the separation efficiency exceeds 98%. It also can be used as adsorbent material to absorb various oils, and the absorption capacity for carbon tetrachloride reached up to 34 g/g. Moreover, it can selectively, rapidly, and continuously separate oil or water by assisted peristaltic pump. After 15 cycle times, its separation efficiency is still as high as 98%. It has excellent comprehensive mechanical properties and antifouling ability. These results indicated that 3-D TPU/d-CA composite foam has broadly application prospects in oil/water separation field.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2021
·Vol. 7
·期 1
·203-214
·
IF 2.347
Tang Zujian,Guan Xiaofei
Abstract Lithium is a critical metal with a wide range of applications in energy, electronics, and chemical industry. Currently, the industrial method for Li metal extraction relies on electrolysis of molten LiCl and suffers from various safety, cost, and environmental issues. In this work, we report electrochemical extraction of Li from molten LiOH by using a liquid tin (Sn) cathode. The use of liquid Sn cathode offers various advantages, such as lowering the dissociation potential of LiOH and easy collection of the metallic Li. Electrochemical and materials characterization results reveal that a plunge of electrolysis current occurs in the electrolyser without using a porous alumina membrane, due to the formation of a Li 2 O passivation layer at the cathode/electrolyte interface. In the electrolyser with a porous alumina membrane, continuous electrolysis has been achieved, and the side surface of the liquid Sn is identified to be the effective interface for Li electrodeposition. In addition, we demonstrate the use of the Li–Sn product for the synthesis of acetylene (C 2 H 2 ), a widely used fuel and chemical feedstock. Graphical Abstract
研究领域:
材料科学
·
电化学
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能源技术
·
化学工程
✓ 已验证
DOI
高影响因子
Science Advances
·
2024
·Vol. 10
·期 37
·
IF 11.7
Ruifen Jiang,Gan Luo,Guosheng Chen,Yuhong Lin,Linjing Tong,Anlian Huang,Yang Zheng,Yong Shen,Siming Huang,Gangfeng Ouyang
Continuous industrialization has raised daunting environmental concerns, and there is an urgent need to develop a sustainable strategy to tackle the contamination issues. Here, we report a supramolecular photoenzyme ensemble enabling the harvest of solar energy to remove contaminations in water. The well-sourced oxidoreductase, laccase, is confined into a photoactive hydrogen-bonded organic framework (PHOF) through an in situ encapsulation method. The direct electron migration between the oxidation center in a PHOF and the reduction center in laccase facilitates synergistic photoenzyme-coupled catalysis, showing two orders of magnitude higher activity than free laccase for pollutant degradation under visible light, without the need for sacrificial agents or costly co-mediators. Such high decontamination efficiency also surpasses the reported catalysts. The structure and decontamination function of this supramolecular photoenzyme ensemble remain highly stable in complex environment matrices, presenting desirable reusability and almost 100% conversion efficiency of pollutants for real sewage samples. Our conceptual photoenzyme hybrid catalyst offers important insights into green and sustainable water decontamination.
研究领域:
环境科学
·
材料科学
·
化学
·
可持续性
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Junjie Yu,Wenping Li,Qingxue Li,Pingyun Li,A. V. Rogachev,Xiaohong Jiang,Jiazhi Yang
With the development of society and the growing concern about environmental issues, continuous flow catalytic reactors have gained significant interest due to their resource-efficient advantages over traditional batch devices. In this study, we employed a facile one-step in situ reduction approach to construct highly dispersed gold nanoparticles loaded on regenerable bacterial cellulose nanofiber (BCN) heterogeneous catalysts. These catalysts, in combination with a nanoceramic membrane with a pore size of 1 nm, formed a fully mixed system that was favorable for the efficient continuous flow catalysis of selective reduction reactions of nitrophenol. The reaction system demonstrated remarkable catalytic activity toward nitrophenol reduction reactions at low reductant dosages (<5 equiv), achieving over 95% conversion and 99% selectivity for the aniline product in 10 min under room temperature conditions. Furthermore, continuous flow operations maintained stable catalytic activity with minimal catalyst loss after a 120-h test and were 3 times more time-efficient than batch operations. Additionally, continuous monitoring could be conducted through ultraviolet (UV) spectroscopy. A highly efficient and environmentally friendly strategy was present for designing continuous flow reactions in future applications.
研究领域:
化学工程
·
环境科学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Peng Zhao,Rui Wang,Jun Xiang,Jinwei Zhang,Xiaodong Wu,Chaojian Chen,Gongyan Liu
Functional face masks that can effectively remove particulate matter and pathogens are critical to addressing the urgent health needs arising from industrial air pollution and the COVID-19 pandemic. However, most commercial masks are manufactured by tedious and complicated network-forming procedures (e.g., meltblowing and electrospinning). In addition, the materials used (e.g., polypropylene) have significant limitations such as a lack of pathogen inactivation and degradability, which can cause secondary infection and serious environmental concerns if discarded. Here, we present a facile and straightforward method for creating biodegradable and self-disinfecting masks based on collagen fiber networks. These masks not only provide superior protection against a wide range of hazardous substances in polluted air, but also address environmental concerns associated with waste disposal. Importantly, collagen fiber networks with naturally existing hierarchical microporous structures can be easily modified by tannic acid to improve its mechanical characteristics and enable the in situ production of silver nanoparticles. The resulting masks exhibit excellent antibacterial (>99.99%, 15 min) and antiviral (>99.999%, 15 min) capabilities, as well as high PM 2.5 removal efficiency (>99.9%, 30 s). We further demonstrate the integration of the mask into a wireless platform for respiratory monitoring. Therefore, the smart mask has enormous promise for combating air pollution and contagious viruses, managing personal health, and alleviating waste issues caused by commercial masks.
研究领域:
材料科学
·
生物医学工程
·
环境科学
·
医疗技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 2
·785-792
·
IF 3.502
Jinhua Zhang,Si Xiong,Jingran Wang,Yue’e Ni,Changming Ke
Phase pure and nano-sized hafnium diboride (HfB 2 ) fine powder was prepared via a novel sustainable silicothermic route at 1100°C from inexpensive raw materials HfO 2 , Na 2 B 4 O 7 and Si. By introducing sodium oxysalts as source of Na 2 O into the batch mixtures, the SiO 2 / Na 2 O modulus in the melt were reduced from 5:1 to 2:1, and the original water-insoluble byproduct SiO 2 was taken by the melt at test temperature and converted into water soluble sodium silicate (Na 2 Si 2 O 5 ) which was easily removed from the reacted mass via simple hot water washing. Consequently, the aqua sodium silicate could be readily recycled and used as a precursor for preparing many other valuable materials due to absence of foreign salts (eg halides, especially in the molten salt-assisted synthesis process) in the synthesis process, and the relevant environmental concerns could be alleviated. Using excessive amount of 20 wt% Si and 15 wt% Na 2 B 4 O 7 as compensation for the evaporation loss of silicon, in the form of SiO (g), and B 2 O 3 in the reduction process, a high reaction extent was achieved and HfO 2 and Na 2 B 4 O 7 were completely converted into HfB 2 at 1100°C.
研究领域:
材料科学
·
化学工程
·
可持续化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Haojie Ni,Huatao Li,Wenna Hou,Jian Chen,Song Miao,Yanbo Wang,Huan Li
The widespread use of disposable plastic straws has caused a long-lasting environmental problem. Potential alternatives for plastic straws are far from satisfactory due to the low utility, poor water stability, and non-ideal natural degradability. In this work, an edible, hydrostable, and degradable straw was developed from the economically significant seaweed. Seaweed-derived insoluble cellulose fibers were used as the building block of the straw, and the soluble polysaccharide extracts were explored as the natural glue through the chelation with Ca 2+ . Repeated freeze-thawing was introduced to strengthen the molecular interactions, which further improved its mechanical stability and hydrostability. The straw exhibited remarkable natural degradability in open environments, particularly in marine-mimicking conditions. By incorporating pH-sensitive food pigments, the straws could indicate acid-base property of a beverage or even discriminate the freshness of milk. The versatile seaweed-derived straw adhered to the biocycle concept of “from sea to sea” to alleviate the burden of white pollution on oceans.
研究领域:
环境科学
·
材料科学
·
生物技术
·
可持续发展
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）