PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Bing Wang,Wei Ma,Yuan Chen,Yujia Gao,Guojun Hu,Guochuan Luo
Drilling solid waste (DSW) is a typical byproduct of drilling operations in oil and gas fields. The characteristics of DSW are influenced by both the background soil properties and any added additives. Heavy metal (HM) contamination, particularly cadmium (Cd 2 + ), poses a significant environmental challenge due to its toxicity to nearly all living organisms, including plants. DSW samples from the Tarim Oilfield, Xinjiang, China, were analyzed for HM content and its form distribution. The total Cd content was 48 mg/kg, with 41.1 % as unstable HM and 58.9 % as stable HM, exceeding the standard (DB 65/T 3997–2017). Conventional methods for remediating HM-contaminated soil, such as chemical washing and adsorption, are commonly used. X-ray diffraction (XRD) analysis revealed that the DSW has a crystalline carbonate structure, which is disrupted when treated with strong acids. Thus, in this study, a modified self-floating magnetic hollow glass microsphere (FHGM) was employed to remediate HM-contaminated DSW without the use of acidic washing agents. FHGM has a hollow structure, floats within 30 s, and possesses a saturation magnetization near 9, allowing for effective self-flotation and magnetic response, which facilitate its separation from the DSW. The results show that when the solution pH was 8, contact time was 240 min, the dosage of Fe 3 O 4 was 0.6 g and the proportion of heavy metals to FHGM= 100:1, the removal efficiency of Cd from DSW using FHGM reached 78.8 %. Notably, the removal rate of HMs from the FeMn and OM fractions was high, indicating that FHGM enhances the migration of stable HMs. Furthermore, using centrifugal force at 17,232 x g, Cd and FHGM were effectively separated, with the material being recycled up to five times, FHGM still retain approximately 73.2 % of their initial adsorption capacities. Therefore, enhanced separation of stable-state Cd from DSW using FHGM presents an effective new treatment technology. The preparation of FHGM also means that it provides a new green and economic treatment method for the remediation of heavy metal pollution in the solid phase (not limited to DSW).
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Jianbo Zhang,Zhijun Zhou,Bo Ge,Guina Ren,Tonghui Zhang,Zhaozhu Zhang
The discharge of industrial wastewater and the shortage of fresh water resources are increasingly endangering human daily life. In this experiment, bismuth oxychloride with oxygen vacancies was attached to a fabric surface using the solution deposition method, and then perfluoro-trichlorosilane was grafted on the surface to prepare a multifunctional superhydrophobic fabric. After mechanical stability testing, the fabric retained a water contact angle that consistently exceeded 150°, which could realize the selective adsorption of insoluble oil such as cyclohexane. Through a capture experiment of active species, the conclusion drawn was that holes (h + ) and superoxide free radicals (·O 2 − ) were primary active species for the photocatalytic degradation process. After 4 cycles of photodegradation, the degradation efficiency could still reach 92.8 %, showing excellent cyclic degradation stability. An interfacial solar steam generator (ISSG) was assembled using the superhydrophobic fabric as the support layer and a polypyrrole sponge as the photothermal layer, whose evaporation efficiency under one sun reached 2.8376 kg·m −2 ·h −1 , with a photothermal conversion efficiency of 92.255 %. This ISSG demonstrates excellent wastewater purification capabilities. Interfacial evaporation devices show promising prospects in solar-powered wastewater purification, which further expand the use of interfacial evaporation to solve the problem of water scarcity.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yanyan An,Mengxin Han,Huaili Zheng,Wei Ding,Qiang Sun,Chao Hu,Liushi Zheng
In heterogeneous reactions, efficient solid–liquid separation of catalyst from water after oxidation is a significant approach to reduce possible secondary pollution of aquatic environments. In this work, a hollow-structured self-floating copper-loaded catalyst (HSM-N-Cu) was fabricated using copper ammonia complexes and hollow glass microsphere as the copper source and supporter, respectively. The SEM, TEM, BET, XPS, and XRD characterization results suggested ideal specific surface area and stability of HSM-N-Cu. The prepared HSM-N-Cu in conjunction with sulfite have been successfully applied for As(III) oxidation in near-neutral conditions. In general, HSM-N-Cu effectively activating S(IV) process involved Cu(II)/Cu(I) conversion and chain reactions of oxysulfur radicals, where the S(IV) acted as a complexing ligand to Cu(II) surface and precursor of oxysulfur radicals. SO 4 − was verified as the dominant contributor to As(III) oxidation, the apparent reaction rate constant ( k obs ’ ) for SO 4 − generation was 1.81 ± 0.12 M −1 s −1 , and the reaction rate constant ( k 12 ) of SO 5 − + As(III) → As(IV) + SO 5 2− was first calculated as 2.6 × 10 6 M −1 s −1 by kinetic study. The apparent activation energy ( E a ) was 48.6 ± 0.1 kJ mol −1 at 100 mg L −1 HSM-N-Cu. Additionally, self-floating HSM-N-Cu could be easily separated, and its great stability was proven after six-cycle test. Furthermore, the HSM-N-Cu/S(IV) system can work effectively in broad range of geochemical conditions. In summary, the established process is feasible for remediation of As(III)-contaminated water, the collection of self-floating catalysts by surface separation from water provides a new idea to reduce secondary pollution of water by catalysts.
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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2022
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IF 14.224
Gongduan Fan,Chenjian Cai,Zhuoyi Chen,Jing Luo,Banghao Du,Shangwu Yang,Jiaxin Wu
The poor light transmittance , low recycling rate and potential secondary pollution problems of powder photocatalysts limit the practical application of photocatalytic technology. Therefore, there is an urgent need to develop stable floating photocatalysts to alleviate the problem of harmful algal blooms (HABs). In this work, a floating Ag 2 MoO 4 /TACN@LF composite was synthesized for the inactivation of Microcystis aeruginosa ( M. aeruginosa ) by employing a simple oscillatory impregnation method. The Ag 2 MoO 4 /TACN@LF floating photocatalyst exhibited stable algae removal performance under various conditions, and 100% chlorophyll a removal rate could be achieved within 4 h of visible light irradiation under the optimal photocatalyst loading of 6 g/L. The effects of Ag 2 MoO 4 /TACN@LF floating catalyst on algal cell membrane permeability, phycobiliprotein, intracellular antioxidant enzyme activities and algal organic matter were further studied. Moreover, the scavenging experiments demonstrated that •OH was the predominant reactive oxygen species (ROSs). Ag0 and 3 g-C 3 N 4 * also made a non-negligible contribution to the inactivation of algal cells. What's more, the Ag 2 MoO 4 /TACN@LF still exhibited 92% inactivation efficiency for M. aeruginosa after 5 cycles reused experiments, indicating its promising potential for practical application of alleviating HABs.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 30
·期 4
·2279-2288
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IF 6.123
Duan Xia,Zhang Shouwei,Liu Qingtao,Yu Zhicai,Cui Yongming,Tang Bin,Zhang Qian,Wang Jinfeng
The nanostructure of materials plays a key role in interfacial solar vapor generation. Traditional approaches for optimizing interfacial evaporation rely on the external devices to enable floating on water. However, how to unlock the self-floating ability of absorbers for solar interfacial evaporation have not been taken into account. Here, we propose a self-floating absorber based on kapok fibers, which possess large hollow structure and hydrophobicity to enable this absorber float on water without assistance. Gold nanoparticles (AuNPs) were loaded on kapok fibres by in-situ synthesis and showed an extended adsorption (74.7%) wavelength ranging from 280 to 2500 nm. Both the hollow structure of kapok fibres and the thermal localization effect of AuNPs sustaintially enhance the solar interfere vapor generation effect (4 kW m −2 , up to 89%). Also, Each cycle test was carried out under 1 h irradiation. The AuNPs/kapok membrane exhibited stable cycling performance, which maintained an evaporation rate of 6.98 kg m −2 h −1 over 10 times without performance decrease. These results provide new insights for design of advanced photothermal conversion materials with biomass as supporting material, We expect this as-prepared membrane can be used for a range of applications, such as solar interference steam generation, desalination and disinfection, to name a few.
研究领域:
材料科学
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能源技术
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Huiying Bai,Panpan He,Liang Hao,Ning Liu,Zifen Fan,Bingyu Chen,Ran Niu,Jiang Gong
Interfacial solar-driven water evaporation is an appealing technology to mitigate freshwater crisis mainly caused by increasingly aggravated water pollution. Unfortunately, when polluted water is used, toxic organic pollutants might remain or even get enriched, leading to more serious water pollution. Herein, a self-floating bifunctional Fe 2 O 3 /N,O-doped carbon foam (FCF) evaporator is easily prepared by carbonization of waste polyester for simultaneous interfacial solar-driven water production and photocatalytic degradation of organic pollutants. The as-prepared FCF possesses low heat conductivity (0.074 W m −1 K −1 ), 3D interconnected pores, abundant functional groups as well as super-hydrophilicity, which impart FCF with fast water transport, high light absorptivity (98%), good photothermal conversion, and low vaporization enthalpy . Therefore, FCF presents high evaporation performance, e.g., 2.50 kg m −2 h −1 under 1 Sun irradiation, outperforming many advanced solar evaporators. Furthermore, the synergistic effect of heteroatom-doped carbon foam, Fe 2 O 3 nanoparticle , and interfacial thermal energy is certified on the activation of peroxymonosulfate (PMS) to form diverse reactive oxide species (e.g., SO 4 •− ), which promote the degradation of diverse organic dyes or mixed dyes. Compared with FCF and PMS systems, the rate constant of FCF + PMS system (3.79 ×10 −2 min −1 ) is enhanced by 173.8 and 1.6 times, respectively. In outdoor experiments, the amount of freshwater production from per meter square (13 kg) satisfies with 5 adults’ daily water demand, and the dye degradation efficiency reaches 99.8%. The integration of advanced oxidation process into interfacial solar evaporation offers a promising strategy to simultaneously solve freshwater scarcity and sewage disposal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yutong Wen,Chunlong Xue,Deluo Ji,Ye Zhang,Meng Zhang,Weiqian Gong,Zhiqi Li,Ying Li
This study employed an anionic heteropolysaccharide extracted from overgrown Enteromorpha and homopolysaccharide pullulan to fabricate a self-floating hydrogel by introducing bubble templates. Subsequently, green in-situ reduction and immobilization of silver nanoparticles (Ag NPs) in the hydrogel were successfully achieved without additional reducing agents. The heteropolysaccharide from Enteromorpha provides carboxyl and sulfate groups for Ag + ions complexation, which is beneficial for the in-situ reduction of Ag NPs and inhibits their aggregation. The incorporation of bubble templates facilitates the creation of a hierarchical pore structure in the hydrogel, giving it self-floating properties for easy recycling, while the hierarchical network with rich anchor sites ensuring adequate traction for Ag NPs dispersion and stabilization. By adjusting polysaccharide content and using bubble templates, Ag NPs smaller than 10 nm can be obtained. The composite hydrogel exhibits tunable catalytic activity and excellent degradation towards Rhodamine B, Methyl Orange, and 4-Nitrophenol, with the normalized rate constant ( k nor ) of 78.89, 59.08, and 30.42 min −1 g −1 , respectively. Notably, the reduction efficiency remained above 98 % after 6 recycles with little leaching of Ag NPs, benefiting from its self-floating ability for easy recovery in practical applications.
研究领域:
环境科学
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Bao Bing,Hu Chao,Zheng Qiquan,Huo Guoyou,Jiang Junyi,Zhang Yuxin,Zheng Huaili,Li Hong
The co-contamination of dyes and heavy metal ions often used as mordants poses potential risks to environment and public health, and is a challenging problem that needs to be solved in water treatment. Meanwhile, improving the solid–liquid separation capability of adsorbents is of great significance for the application of adsorption technology. Herein, amidation modified hollow composite microspheres were prepared using hollow glass microsphere (HGM) as matrix through hydrolysis and condensation of silane coupling agent (A-1100) and subsequent amidation reaction. The material (HGMNE) not only exhibited good adsorption performance for DB86 and Ni 2+ but also had stable self-floating capability. The adsorption of DB86 by HGMNE is mainly carried out by the electrostatic interaction between positively charged quaternary amine nitrogen and negatively charged DB86, while the adsorption of Ni 2+ is achieved by the carboxyl group in EDTA group through complexation interaction to adsorb Ni 2+ to form Ni complex. This research not only is devoted to the utilization of HGMNE to achieve the co-removal of DB86 and Ni 2+ and flexible self-floating solid–liquid separation but also verifies the feasibility and applicability of the modification method of introducing organic adsorption functional groups through amidation reaction, so as to expand the preparation path of HGM-based adsorbents. Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Yanyan An,Huaili Zheng,Qiang Sun,Xinyu Zheng,Wangqing Liu,Xiaomin Tang,Zikang Xiong
In the case of a sharp increase in the price of dyes, the dyes concentration of in wastewater is important for environmental protection and industrial costs reduction. In this study, we grafted single-layer amino groups onto the surface of the hollow glass microspheres by a two-step simple synthesis, and the anionic dyes adsorption process reaches equilibrium within 10 min. The as-synthesized adsorbent has self-floating ability to achieve high-efficiency surface solid-liquid separation with water. SEM, EDS, S BET , FT-IR, XPS, TGA characterizations results demonstrated the successful grafting of amino groups and the important role of the pretreatment process in the two-step synthesis. The results of adsorption isotherms and kinetics show the adsorption process belongs to single-layer adsorption with equal adsorption sites, and the adsorption capacities for acid orange 7 and amaranth reach 428.99 mg g −1 and 145.62 mg g −1 , respectively. Regeneration of the adsorbent and concentration of the dye solutions can be achieved by dispersing the separated adsorbent in alkaline solution, the maximum concentrated concentration of acid orange 7 and amaranth was 6321.57 mg L −1 and 2431.84 mg L −1 , respectively. This study provides new insights for the solid-liquid separation of water treatment agents and the resource regenerating of dyeing wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Technology
·
2024
·
IF 3.6
Lingxue Kong,Ye Jia,Ke Zeng,Yuping Wang,Tengdi Zhang,Anmin Liu,Liguo Gao,Tingli Ma
Solar-driven interfacial evaporation is one of the most promising technologies to address global freshwater shortages. Compared with the integrated structure, monolithic system with asymmetric wettability can be used alone to reduce the structural complexity without sacrificing the localized management of heat. Herein, a monolithic structure of Janus Fe 3 O 4 @IF evaporator with asymmetric wettability has been fabricated via a simple in situ hydrothermal method. The low-cost Janus Fe 3 O 4 @IF evaporator can be self-floating with a sizable surface area, high porosity, and low density, which presents excellent light absorption features of 98.1% within a broadband wavelength range of 200–2500 nm. Due to the strong capillarity action and Janus wettability, the evaporation is efficient (1.64 kg m −2 h −1 ) and stable even treating with highly concentrated brine of 20 wt%. This work demonstrates an effective strategy for achieving high-performance solar-driven interfacial evaporation and superior salt rejection capability, which can be potentially utilized in seawater desalination.
研究领域:
材料科学
·
环境科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Kai Wang,Zhongfa Cheng,Pengfei Li,Yiwei Zheng,Zhen Liu,Liang Cui,Jiangtao Xu,Jingquan Liu
A promising approach to resolving insufficient freshwater resources is utilizing solar energy for steam generation. Although various types of photothermal conversion materials have been developed, there are still some obstacles, such as complicated system structure fabrication and low energy utilization, that severely hinder their practical application. Herein, we designed and produced a self-floating porous carbon/polyaniline foam (PCPF) evaporator via impregnating melamine foam with porous carbon generated following the bottom-up pyrolytic method and polyaniline , followed by thermal treatment, for efficient solar steam generation. The PCPF obtained with a porous carbon (PC) to polyaniline (PAN) mass ratio of 3:5 (PCPF-3) exhibited a rich pore structure , good hydrophilicity , low thermal conductivity (0.0413 W m −1 K −1 ), and excellent light absorption (96.1%). Our results show that, without additional thermal insulators , the evaporation rate of PCPF-3 reached 1.496 kg m −2 h −1 , and the photothermal conversion efficiency reached 87.3% under one sun irradiation. Furthermore, it also exhibited good durability and desalination performance. This type of environmentally friendly, low-cost, and stable photothermal conversion material could be used in water treatment and seawater desalination.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Yanyan An,Huaili Zheng,Zhishuang Yu,Yongjun Sun,Yili Wang,Chun Zhao,Wei Ding
Rapid, high-efficient adsorbents with efficient solid-liquid separation ability has broad application prospects in the treatment of dye wastewater. In this study, polydopamine and methacryloyloxyethyltrimethyl ammonium chloride were grafted onto hollow glass microspheres to prepare the enhanced polydopamine shell structure adsorbent with self-floating ability. Furthermore, the adsorbent achieves high-efficiency surface solid-liquid separation, which overcomes the disadvantages of the traditional separation methods. Characterizations of the as-synthesized microspheres were performed using various techniques such as SEM, EDS, BET, XPS, FT-IR, TGA and XRD. The adsorbent achieved rapid and high-efficient adsorption of alizarin cyanine green F via the interactions of electrostatic attracting and π-π stacking, and under the optimal experimental conditions, the removal efficiency of 0.10 m mol L −1 dye solution reaches 94.51%, and the adsorption process reaches equilibrium within 60 min. Adsorption isotherms and kinetics data of the adsorbent were well fitted by Langmuir isotherm and pseudo-second-order kinetic models, respectively. The as-synthesized adsorbent has excellent recyclability, and its adsorption performance can be maintained after 5 cycles of reuse. The self-floating adsorbent has great potential for the removal of dissolved contaminants and cost-effective separation.
研究领域:
环境科学
·
材料科学
✓ 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）