CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Mingliang Zhang,Qian Ye,Qianqian Yi,Hanbin Wu,Chao Liu,Bingjie Zhang,Xinyi Li,Bin Yan
Extensive studies have been conducted on advanced oxidation processes (AOPs) for the removal of antibiotics in water environments. However, the separation and recovery of powdered catalysts from water at the end of the reaction remains a great challenge, which hinders the large-scale application of powder photocatalysts. Inspired by the high sustainability, energy efficiency, and cleanliness of photocatalytic technique in antibiotic degradation, we have developed a stable and efficient ultra-thin porous g-C 3 N 4 /β-phase polyvinylidene fluoride (CA-CNS/β-PVDF) membrane for antibiotics removal. Under the optimal reaction conditions, the tetracycline (TC) removal rate of the membrane reached 93.12 % within 2 h due to the synergistic effect of the embedded ultra-thin porous g-C 3 N 4 and β-phase polyvinylidene fluoride (PVDF). The CA-CNS/β-PVDF membrane still maintained excellent photocatalytic performance after five cycles, showing good stability and reusability. The electron paramagnetic resonance (EPR) and free radical quenching analyses suggest that the TC degradation efficiency is enhanced by the synergistic effect of free radical-non-free radical mixed pathways (•O 2 , •OH, h + , 1 O 2 ) and 1 O 2 plays an important role in the degradation process. The excellent photocatalytic antibiotics degradation performances of CA-CNS/β-PVDF membrane were still obtained in actual water samples under natural sunlight, suggesting its great application potentials. The photocatalytic mechanism, possible degradation intermediates, and degradation pathways are elucidated based on the theoretical calculations and experiments. The toxicity analysis by QSAR shows that the CA-CNS/β-PVDF membrane successfully reduces the biological toxicity of three antibiotics (TC, OTC, CIP) during the photocatalysis. In all, our work provides a universal immobilization technique of powdered photocatalysts to improve their wastewater purification efficiencies.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RSC Advances
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2024
·Vol. 14
·期 17
·12049-12057
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IF 3.9
Xiaofan Su,Yaqi Lin,Xingyu Hu,Xinzhi Tan,Yao Mai,Minyan Jiang,Ruitao Zhang,Fangjun Huo,Lei Liu,Weidong Tian,Li Xie
A novel sustained chlorine-releasing polydimethylsiloxane/Ca(ClO)2 (PDMS/Ca(ClO)2) material was fabricated by encapsulating Ca(ClO)2 in a PDMS matrix due to its high hydrophobicity and high chemical stability, which showed immediate-responsive and long-lasting antibacterial capabilities in aqueous conditions. Free chlorine could be released from the PDMS/Ca(ClO)2 after immersion in water for 2 min and could also be sustainedly released for 2 weeks, while the released concentration is negatively related to the duration time and positively with the initial Ca(ClO)2 contents. Additionally, Ca(ClO)2 powder as a filler significantly affects the crosslinking and pore size of PDMS. The PDMS/Ca(ClO)2 materials exhibited enduring antibacterial performance against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) in both planktonic and multispecies-biofilm status. It is expected that this PDMS/Ca(ClO)2 material and its similar composite would be promising candidates for wide sustainable disinfection applications in biomedical and industrial fields.
研究领域:
材料科学
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生物医学工程
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微生物学
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化学工程
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DOI
PubMed
高影响因子
ACS Omega
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2024
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IF 3.7
Yuqian Zhou,Yuhe Zhou,Renlong Liu,Guocan Zheng,Changyuan Tao,Benjun Xi
The resource utilization of phosphogypsum (PG) is the key to promote the green development of the phosphorus chemical industry. The natural environment and public safety are significantly threatened by the enormous volume of PG storage. In this study, Ca and S were successfully recovered from the PG via a multistep precipitation in the NaOH–BaCO3 system. The alkali solution can be recycled five times, with a first recovery ratio of about 97.9%, and the decomposition ratio of PG remained above 70% after five cycles. In addition, the recovery ratios of Ca and S in PG are 99.9 and 82.5%, respectively. The product of BaSO4 can be used as a weighting agent for oil and natural gas drilling mud. The BaSO4 can also be used as wave-absorbing materials, and its reflection loss value reaches 97.8% of the analytical purity BaSO4. This work provides a new idea for the efficient recycling of Ca and S in PG with an outstanding application prospect.
研究领域:
化学工程
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环境科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Shuzhuang Sun,Bocheng Yu,Yanmei Shen,Yu Liu,Hongman Sun,Xuan Bie,Mengna Wu,Yongqing Xu,Chunfei Wu,Hui Zhou
Integrated CO 2 capture and utilization (ICCU) using “capture-conversion” dual functional materials (DFMs) paves a cost-effective path for restricting CO 2 emissions by eliminating the energy-intensive intermediate processes. The interactions between catalysts and absorbents are believed pivotal in ICCU; however, there is a lack of environment-friendly strategy to fabricate the interaction for industrial applications. Here, we propose a solvent-free mechanochemical approach to promote the interaction by improving the proximity between natural calcium and iron sources. The interaction was systemically investigated and confirmed using XRD, XPS, TEM, TPR, etc. As a result, the mechanochemical approach derived DFM achieved 5.5 mmol g −1 CO 2 capacity, 87 % CO 2 conversion, and 100 % CO selectivity at 650 °C, significantly outperforming the CaO-alone benchmark (CO 2 capacity < 4.5 mmol g −1 , CO 2 conversion < 73 %). Further incorporating MgO would alleviate the sintering and promote the CO 2 capture stability (< 15 % decrease after 20 cycles) by acting as a thermal-stable barrier. Based on in situ XRD, it is further confirmed that Fe-Ca interaction exhibits a dynamic looping mechanism in ICCU. The techno-economic analysis strongly supports the superiority of ICCU catalyzed by naturally sourced DFMs on eliminating the energy and H 2 consumption for CO 2 capture and upgradation. As a result, producing CO via ICCU using mechanochemical derived DFMs exhibits 20 % and 10 % cost decrease compared to the conventional CCU and ICCU using CaO alone scenarios, pointing out the potential of ICCU technology in industrial applications.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
ACS ES&T Water
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2024
·
IF 4.8
Fanglin He,Yuhang Cao,Yehang Wu,Hang Chen,Fu Huang,Ming Chang,Chaohai Wei,Guanglei Qiu
Effective and sustainable removal of low-concentration phosphate is imperative but challenging for advanced wastewater treatment. Additionally, an eco-friendly and cost-effective treatment and reuse of waste activated sludge is critical. To address these problems, sludge-biochar-based phosphate adsorbents were developed by pyrolyzing waste activated sludge and then functionalizing with Ca–La layered double hydroxide (LDH). The LDH’s structure and adsorption characteristics were optimized by substituting the intercalated ion CO32– with NO3–. A maximal phosphorus adsorption capacity of 78.24 mg of P/g was achieved. Adsorption kinetics showed that 0.2 g/L functionalized sludge biochar effectively lowered PO43––P concentration from 7.0 to <0.02 mg/L within 2 h. The functionalized sludge biochar showed desirable phosphate (7 mg/L) selectivity toward coexisting anions such as sulfate (120 mg/L) and carbonate (250 mg/L), resulting in barely impacted adsorption capabilities. After 4 repetitive adsorption-regeneration experiments, 65.1% adsorption capacity remained. The functionalized sludge biochar was used to remove phosphate from a local wastewater treatment plant. The PO43––P concentration effectively decreased from 1.29 to <0.02 mg/L within 1 h. The promising selectivity and stability of the functionalized sludge biochar are due mostly to selective chemisorption, ion exchange, and phosphate complexation in the inner layer.
研究领域:
环境科学
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废水处理
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
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IF 9.6
Meihui Li,Mingkai Fu,Yanwei Huang,Tingxuan Ran,Gongao Peng,Qiaowen Yang,Lu Shang,Tierui Zhang
Ca-based thermochemical energy storage (TCES) systems are critical for large-scale green energy utilization, as they bridge the gap between intermittent solar supply and stable energy demand, and stand out for their high energy density and economic advantages. However, their practical application is limited by persistent challenges, including CaO sintering and weak solar absorption. In this study, Fe/Mn co-doped CaCO 3 microspheres were synthesized by co-precipitation method, followed by coating with SiO 2 or TiO 2 shells to construct two core@shell composites, namely CaCO 3 (Fe, Mn)@SiO 2 and CaCO 3 (Fe, Mn)@TiO 2 . The introduction of Fe/Mn doping markedly improved the solar absorption capacity of the CaCO 3 matrix. High temperature cyclic tests (800 °C, 100 calcination/carbonation cycles) further demonstrated that the core@shell structure significantly improved the cyclic stability. Notably, CaCO 3 (Fe, Mn)@TiO 2 maintained 96.2% of its initial energy storage density (1046.1 kJ kg −1 ) after 100 cycles, corresponding to a final density of approximately 1006.1 kJ kg −1 . In contrast, CaCO 3 (Fe, Mn)@SiO 2 retained 752.4 kJ kg −1 (from an initial 1178.7 kJ kg −1 ) after 100 cycles, while uncoated CaCO 3 (Fe, Mn) dropped to 481.1 kJ kg −1 (from an initial 1817.9 kJ kg −1 ). This superiority is attributed to the higher Tammann temperature and stronger Ti O bond dissociation energy of TiO 2 , which endow the TiO 2 shell with robust thermal stability and structural integrity, effectively suppressing particle sintering and pore collapse. The results validate that the core@shell protection strategy provides a viable design paradigm for developing high performance TCES materials, thereby promoting progress in the field of TCES.
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DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
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2018
·Vol. 25
·期 7
·1-8
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IF 1.434
Song Hai-ming,Zhu Li-jing,Zeng Zhi-xiang,Xue Qun-ji
Cellulose acetate (CA) is a low cost and readily available material widely used in forward osmosis (FO) membranes. However, the performance of pure CA membranes is not good enough in salt separation and the traditional modification methods are generally multistep and difficult to control. In this paper, we reported high performance cellulose acetate (CA) composite forward osmosis (FO) membranes modified with polyvinyl alcohol (PVA) and polydopamine (PDA). PVA was first cross-linked onto the surface of CA membranes, and then PDA was coated with a rapid deposition method. The membranes were characterized with respect to membrane chemistry (FTIR and XPS), surface properties comprising wettability (by water contact angle), and osmosis performance. The modified membrane coated by PVA and PDA shown better hydrophilicity and exhibited 16.72 LMH osmotic water flux and 0.14 mMH reverse solute flux with DI water as feed solution and 2.0 M NaCl as draw solution and active layer facing the feed solution. This simple and highly effective modification method makes it as an excellent candidate for further exploration for FO.
研究领域:
材料科学
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化学工程
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环境工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2019
·Vol. 102
·期 10
·6194-6201
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IF 3.094
Shunhang Wei,Shu Jin,Guoxiang Pan,Zuxin Li,Gang Liu,Xiaoxiang Xu
Although BaNbO 2 N has visible light absorption as far as 740 nm, its photocatalytic activity is generally very poor under ordinary conditions, being incommensurate to its light absorption properties. In this work, we introduce Ca into the B site of BaNbO 2 N to form a complex perovskite BaNb 1− x /3 Ca x /3 O 2+ y N 1− y (0 ≤ x , y ≤ 1). The presence of Ca in BaNbO 2 N has great impact on a number of important properties such as band gap value, nitrogen content, surface hydrophilicity, and defects levels. In particular, defects such as Nb 4+ species are effectively suppressed in Ca-modified BaNbO 2 N. More importantly, photocatalytic activity of BaNbO 2 N for water oxidation reactions is substantially improved after Ca modifications. Compared with pristine BaNbO 2 N, more than twofold enhancement in photocatalytic oxygen evolution is observed for BaNb 0.8 Ca 0.2 O 2+ y N 1− y ( x = 0.6). Such improvements probably stem from the suppression of Nb 4+ species in the structure as well as enhanced surface hydrophilicity after Ca modification. The facile approach by incorporating alkaline earth cations into crystal structure can be well extended to other perovskite oxynitrides whose photocatalytic activity is subject to those defective species.
研究领域:
材料科学
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光催化化学
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DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2019
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IF 4.527
Peng Gu,Qi Li,Weizhen Zhang,Zheng Zheng,Xingzhang Luo
Eastern China is a typical region that suffers from harmful cyanobacterial blooms. Numerous studies have focused on bloom formation mechanisms; however, the detailed mechanisms remained unclear. Our study explored the influence of four metal ions (Ca, Cu, Pb and Cd) on Microcystis aeruginosa to determine their effects on bloom formation. We found that Ca concentrations higher than 100 mg L −1 contributed to cyanobacterial bloom formation. The presence of Ca triggered the anti-oxidation process and promoted the secretion of extracellular polysaccharides , thus inducing aggregation of algal cells and enhancing their buoyancy 2.1-fold more than the control ( p ＜0.05). The reverse regulation of dissolved CO 2 to bicarbonate by carbonic anhydrase formed a large amount of carbonate and decreased the growth rate by 38–56%. Cu (>0.1 mg L −1 ) presented significant toxicity to algal cells while Pb (>1 mg L −1 ) suppressed the algal growth rate due to the acidic condition. Cd (<0.1 mg L −1 ) exhibited no apparent toxicity to the algae. Furthermore, as the buoyancy increased, Cd was likely to facilitate the formation of cyanobacterial blooms, which needs further research. These findings can provide a theoretical basis for eutrophic lake management and contribute to the development of water quality and wastewater discharge standards.
研究领域:
环境科学
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水生生态学
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水资源管理
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2015
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IF 2.752
Na Zhao,Siwen Li,Xin Zhang,Xinyue Huang,Jinyi Wang,Ruimin Gao,Jianshe Zhao,Junlong Wang
Photocatalytic oxidative desulfurization of dibenzothiophene (DBT) with H 2 O 2 (30%) and Ag/ALa 4 Ti 4 O 15 (A = Ca, Sr and Ba) as the photocatalysts were studied. Ag cocatalyst-loaded ALa 4 Ti 4 O 15 (A = Ca, Sr and Ba) were synthesized by incipient wetness. Reaction time, temperature and the amount of hydrogen peroxide were investigated as the important parameters for optimization of the reaction and a potential removal mechanism of photocatalytic oxidation was proposed. Ag (2 wt%)/CaLa 4 Ti 4 O 15 and Ag (1 wt%)/BaLa 4 Ti 4 O 15 were found to give remarkable catalytic activity and high selectivity for catalytic experiments. Actually, 99.0% and 98.0% of DBT were converted respectively according to the desulfurization tests. Moreover, these two catalysts were characterized by infrared spectroscopy (IR), X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray photoelectron spectrum (XPS).
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 5
·3613-3627
·
IF 1.674
Sun Zhiguo,Feng Run,Zhang Li,Xie Hongyong
A new method of carbon capture and sequestration (CCS) by sodium humate (HA–Na) and Ca(OH) 2 from carbide slag (CS) solution was proposed. The effects of various operating parameters, such as the additive amount of HA–Na, pH, temperature, gas flow rate, CO 2 inlet concentration, and stirring rate on both the Ca ion concentration and Ca conversion rate were investigated in a lab-scale bubbling reactor. The synergistic mechanism of HA–Na and Ca(OH) 2 from CS on CCS is also put forward and demonstrated. The experimental results indicate that HA–Na may improve significantly the CCS capability of CS since the Ca conversion rate of CS is increased 10% by HA–Na additive. The pH is a key factor for the CO 2 absorption process and HA–Na may lower the rate of pH decrease of Ca(OH) 2 solution. The increasing temperature, stirring rate, and CO 2 inlet concentration are favorable to CO 2 capture, as well as low gas flow rate. Ca(OH) 2 from CS mixed with HA–Na solution shows good performance in CO 2 uptake, and the Ca conversion rate reaches 99% with 100 mL of Ca(OH) 2 (1.5 g/L) solution mixed with 0.1 g HA–Na at 40 °C, a gas flow rate of 0.1 L/min, and an inlet CO 2 concentration of 100% at ambient pressure. Moreover, calcite CaCO 3 is is identified as the main product of CO 2 capture by X-ray diffraction and scanning electron microscopy analysis.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
Nanoscale
·
2023
·
IF 6.7
Yaqing Liu,Zongzhang Wang,Yiru Wang,Yushuo Feng,Mengjiao Xu,Xiaoqian Ma,Qianqian Shi,Huaping Deng,Fangfang Ren,Yong Chen,Hongmin Chen
Rheumatoid arthritis (RA) is a common autoimmune disease, and the inflammatory response during its development can lead to joint cartilage and bone damage up to disability. Dexamethasone (DEX) can effectively alleviate the inflammatory response in RA, but the severe adverse effects that occur after long-term administration limit its clinical development. Herein, we propose a Ca-DEX biomineralization-inducing nut (CaCO3-DEX) with controlled-release properties for mitigating the toxic side effects of DEX in RA treatment, especially the damage to cartilage and bone. CaCO3-DEX releases the drug and Ca2+ preferentially in an inflammatory environment. Both in vitro and in vivo studies demonstrate that CaCO3-DEX significantly reduces the secretion of pro-inflammatory factors and inhibits ROS production in vitro, as well as demonstrates superior pro-biomineralization and osteogenic differentiation potential. In the collagen-induced rheumatoid arthritis model (CIA model), CaCO3-DEX significantly reduces the clinical score of arthritis in mice, and imaging results show a noticeable relief of edema and bone erosion in CIA model mice treated with CaCO3-DEX, while inflammatory factors at the injury areas are significantly reduced, which provides favorable protection to cartilage and bone.
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PubMed
高影响因子
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