International Journal of Environmental Research and Public Health
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2022
·Vol. 20
·期 1
·671
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IF 4.614
Yameng Ma,Jia Zhu,Jianghua Yu,Yicheng Fu,Chao Gong,Xiao Huang
Phosphorus widely existing in rainfall and wastewater impacts the water environment. In this study, sludge, cement block, and coal fly ash were employed as ceramsite material to synthesize Al-doped waste ceramsite (Al-ceramsite) for removing phosphate (PO43−-P) from aqueous solutions. Batch static adsorption–desorption experiments were designed to investigate the effect of various parameters such as Al-ceramsite dosage, PO43−-P concentration, temperature, initial pH, coexisting ions, and desorbents on the removal of PO43−-P. Also, the fate of PO43−-P removal efficiency in actual rainwater was studied through dynamic adsorption column experiments using Al-ceramsite. Results showed that Al-ceramsite could remove PO43−-P efficiently under the optimum parameters as follows: Al-ceramsite dosage of 40 g/L, initial PO43−-P concentration of 10 mg/L, temperature of 25 °C, and pH of 5. Besides that, the Al-ceramsite could completely remove PO43−-P in actual rainwater, and the effluent PO43−-P concentration was lower than the environmental quality standards for surface water Class Ⅰ (0.02 mg/L). The adsorption characteristics of Al-ceramsite on PO43−-P by X-ray photoelectron spectroscopy (XPS) were further explained. As a result, ligand exchange and complexation were confirmed as the main PO43−-P removal mechanism of Al-ceramsite. Thus, Al-ceramsite was prepared from industrial waste and has shown excellent potential for phosphorus removal in practical applications.Keywords:phosphate;ceramsite;adsorption;desorption;column experiment
研究领域:
环境科学
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水处理工程
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
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IF 11.3
Shichao Cai,Jiawei Zhao,Yurou Tan,Zhongkuan Wu,Bo Chen,Feng He
In this study, we synthesized microscale sulfidated zerovalent iron (S-mZVI) with controllable mackinawite (FeS) content up to nearly 100 wt % and investigated the roles of FeS and Fe0 for arsenite (As(III)) sequestration under aerobic conditions. Batch experiments show that FeS and Fe0 contents determine the kinetics and longevity of As removal by S-mZVI, respectively. The Fe0/FeS galvanic cell accelerates the consumption of Fe0 by dissolved oxygen (DO) while preserving FeS to preferentially remove As as sulfide, which is protected from oxidation by Fe0. In column studies, mZVI and S0 were mixed in sand to form S-mZVI in situ. Results of sequential extraction of reacted S-mZVI particles from different column zones and run stages further indicate that As formed as sulfide by S-mZVI, which was then oxidized by DO after Fe0 depletion to form As-iron (hydr)oxides. X-ray absorption near-edge structure characterization confirmed that As sulfide is mainly in the form of realgar (As4S4). S-mZVI (2 wt % of column sand) reduces total As from 2 mg/L to 10 μg/L, up to 300 bed volumes, with a residence time of 70 min. In situ synthesis and cost advantages make S-mZVI a promising method to address As contamination issues worldwide.
研究领域:
环境科学
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化学工程
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Yongjian Wang,Xiaogang Luo
The high electronegativity and solubility of fluoride ions (F - ) in water at low concentrations pose challenges for their treatment and recovery. To effectively adsorb F - , cellulose beads with trapped CeO 2 nanoparticles (CeO 2 @CBs) were fabricated from a NaOH/urea aqueous solution by the optimal extrusion dropping technology. The CeO 2 @CBs exhibited a maximum removal efficiency of 99.15 % for 10.0 mg L −1 F - at 45°C, pH=3.0 and an adsorbent dose of 1.0 g. The CeO 2 @CBs were characterized using SEM-EDS, FT-IR, XRD , and XPS . These findings demonstrate that CeO 2 nanoparticles were uniformly entrapped in cellulose beads and reveal that the removal mechanism involves anionic exchange and electrostatic attractions between protonated hydroxyl on CeO 2 @CBs surface and F - . The results show that the anion competition sequence that affects the F - adsorption efficiency was Cl −
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
ENVIRONMENTAL TECHNOLOGY
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2024
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IF 2.2
Tianwen Zheng,Wenbo Fei,Daibing Hou,Peizhong Li,Naijin Wu,Moxi Wang,Yangfan Feng,Huilong Luo,Nan Luo,Wenxia Wei
nZVI has attracted much attention in the remediation of contaminated soil and groundwater, but the application is limited due to its aggregation, poor stability, and weak migration performance. The biological CaCO3 was used as the carrier material to support nZVI and solved the nZVI agglomeration, which had the advantages of biological carbon fixation and green environmental protection. Meanwhile, the distribution of nZVI was characterised by SEM-EDS and TEM carefully. Subsequently, the dispersion stability of bare nZVI and CaCO3@nZVI composite was studied by the settlement experiment and Zeta potential. Sand column and elution experiments were conducted to study the migration performance of different materials in porous media, and the adhesion coefficient and maximum migration distances of different materials in sand columns were explored. SEM-EDS and TEM results showed that nZVI could be uniformly distributed on the surface of biological CaCO3. Compared with bare nZVI, CaCO3@nZVI composite suspension had better stability and higher absolute value of Zeta potential. The migration performance of nZVI was poor, while CaCO3@nZVI composite could penetrate the sand column and have good migration performance. What’s more, the elution rates of bare nZVI and CaCO3@nZVI composite in quartz sand columns were 5.8% and 51.6%, and the maximum migration distances were 0.193 and 0.885 m, respectively. In summary, this paper studies the stability and migration performance of bare nZVI and CaCO3@nZVI composite, providing the experimental and theoretical support for the application of CaCO3@nZVI composite, which is conducive to promoting the development of green remediation functional materials.
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
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2017
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IF 2.31
Liang Du,Shicheng Li,Xiaolong Li,Ping Wang,Zhaoya Huang,Zhaoyi Tan,Chunli Liu,Jiali Liao,Ning Liu
Humic acid (HA) 1 is ubiquitous in the environment and is an important factor in the migration behavior of U(VI) in the geological medium. The present work investigated the effect of HA on the migration behavior of U(VI) using quartz column experiments at different pH values and in the presence of various anions. The U(VI) adsorption characteristics and speciation were also studied to illuminate further the migration behavior of U(VI). Our results indicated that, at pH 6.0, HA slightly increased the migration velocity of U(VI) during the initial phase and reduced the quantity of eluted U(VI) because of the formation of HA-U(VI). The relative concentration ( c / c 0 ) of U(VI)was higher in the HA-U system at pH 8.0 than that at pH 5.0 because of the higher solubility of HA in basic solutions and the difference in charge of HA-U(VI). In the U-HA-anion system at pH 6.0, the breakthrough pore volumes (PVs 2 ) of U(VI) in electrolytes containing Cl − and SO 4 2− anions (PV = 8) are much higher than for solutions containing phosphate (PV = 3), while the HA migration behavior was not significantly affected by the type of anion. Thus, the fast migration of U(VI) under HA and phosphate was attributed to phosphate rather than HA. This result suggests that phosphate should be given more attention in predictions of U(VI) migration, especially in regions with high groundwater phosphate content.
研究领域:
环境科学
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放射化学
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PubMed
高影响因子
RSC Advances
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2017
·Vol. 7
·期 64
·40227-40236
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IF 3.108
Ran Li,Qing-Da An,Zuo-Yi Xiao,Bin Zhai,Shang-Ru Zhai,Zhan Shi
In view of the sustainable character and high-density of reactive sorption sites, a new kind of poly(ethylenimine)/chitosan (PEI/CS) aerogel beads were successfully synthesized using controllable sol–gel and freeze drying methods, with the aim of using them for efficient Cr(VI) removal from aqueous acid solutions. Compared with the reported CS-based sorbents for hexavalent chromium [Cr(VI)], not only is the synthetic process used simple but the bead-like samples could be easily separated from solutions for recycling. Structural characterization and batch experiments were compared to illustrate the adsorption performance of the aerogel beads which were synthesized using various processes. Out of the three samples (CS–glutaraldehyde (GA), CS–GA–PEI and CS/PEI–GA beads), the one referred to as CS–GA–PEI exhibited the highest adsorption capacity and the maximum amount of Cr(VI) removal was 402.9 mg g−1 at pH 2.0 and 298 K. The pseudo-second-order and Langmuir model preferably fitted the adsorption process best. After five cycles of desorption–regeneration tests, more than 80% of Cr(VI) could still be removed by these newly designed CS–GA–PEI beads. Adsorption mechanisms could be explained using electrostatic attraction and reduction reaction theories, on the basis of comprehensive analysis. More importantly, taking advantage of the micrometer sized particles and three-dimensional network that developed, fixed-bed column tests were also conducted on the resultant bead-like sample, which also exhibited excellent sorption performance under testing conditions. These superiorities of CS–GA–PEI beads make them a potential candidate for use in remediating the pollution caused by Cr(VI) ions.
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
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Yu Deng,Jingfan Chen,Ailun She,Fuquan Ni,Wenqing Chen,Tianqi Ao,Ying Zhang
The novel Fe-loaded porous hydrothermal biochars (FeKHCs) were successfully prepared by two-step synthesis of hydrothermal pretreatment and pyrolysis at different temperatures and used to remove tetracycline (TC) from wastewater. The biochar synthesized at 900 °C (FeKHC900) showed the highest specific surface area (SSA) (1487.55 m 2 /g) and porosity volume (V total ) (0.9951 cm 3 /g), which was significantly affected by hydrothermal pretreatment and K 2 C 2 O 4 activation. K 2 C 2 O 4 favored the micropores formation, which was beneficial to TC adsorption. Thus, FeKHC900 had the largest sorption amount of 606.52 mg/g for TC and outstanding performance for the other three antibiotics. Moreover, Fixed-bed column adsorption experiments proved that FeKHC900 has good dynamic adsorption performance (425.93 mg/g). The slightly reduced sorption amounts in different initial pH, coexisting ions, and humic acid (HA) indicated that FeKHC900 has a high resistance to interference and selective adsorption ability. Batch experiments revealed that TC adsorption was dominated by chemisorption, and the main mechanism referred to π-π interactions, pore-filling, H-bonding, and complexation. This work shares a simple and effective strategy for fabricating magnetic porous hydrothermal biochar as an efficient adsorbent to treat antibiotics.
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
Journal of Water Process Engineering
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2024
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IF 6.3
Yixin Pan,Yingying Zhou,Lujia Chen,Liping Deng,Yue Zeng,Peng Sha
In this study, mordenite-supported nanoscale zero-valent iron (nZVI@MOR) composites were prepared for the in-situ remediation of Cr(VI) from groundwater. Batch experiments and dynamic column tests were conducted to investigate the adsorption mechanism and long-term removal performance. The batch results revealed that the optimum pH for Cr(VI) adsorption was ∼3 with a capacity of 101.52 mg/g, following an endothermic adsorption process. The dynamic column test results showed that higher seepage velocities resulted in rapid remediation failure, but an increase in adsorption capacity which increased from 9.61 to 15.53 mg/g with the increase of seepage velocity from 3.9 to 15.6 mL/h at Cr(VI) initial concentration of 20 mg/L, which due to the establishment of dominant seepage channels at elevated velocities, facilitating flow circumvention of the nZVI@MOR composites. The experimental breakthrough curve was best fitted by the Thomas model, with the agreement of fit positively correlated with effective remediation time. The mechanism underlying Cr(VI) removal involves the electrostatic attraction of Cr(VI) to the surface of nZVI@MOR, subsequent reduction to Cr(III) by nZVI as an electron donor to form a complex precipitation for remediation. This result suggests that nZVI@MOR can effectively achieve long-term remediation of Cr(VI)-contaminated groundwater by appropriately controlling the flow rate and material filling methods.
研究领域:
环境科学
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材料科学
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 33
·34345-34356
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IF 2.914
Liu Lili,Chen Xin,Wang Zhiping,Lin Sen
Fluoroquinolones (FQs) occur broadly in natural media due to its extensive use, and it has systematic effects on our ecosystem and human immunity. In this study, long-root Eichhornia crassipes was reclaimed as a multi-functional activated carbon (MFAC) to remove fluoroquinolones (FQs) from contaminated water. To get insight into the adsorption mechanism, multiple measurements, including FTIR and XPS analyses, were employed to investigate the adsorption processes of ciprofloxacin and norfloxacin as well as the experiments of effect of exogenous factors on adsorption performances. The results confirmed that the adsorption of FQs by MFAC was mainly attributed to the electrostatic interaction, hydrogen bond interaction, and electronic-donor-acceptor (EDA) interaction. In addition, the kinetics and thermodynamics experiments demonstrated that the MFAC possessed great adsorption performance for FQs. According to the Langmuir model, the saturated adsorption capacities exceeded 145.0 mg/g and 135.1 mg/g for CIP and NOR at 303.15 K, respectively. The column experiments were conducted to explore the application performance of MFAC on the advanced treatment of synthetic water at different flow rates and bed depths. The adsorption capacity of CIP on MFAC was estimated by the Thomas models and the bed-depth service time (BDST) models, reaching 127.56 mg/g and 11,999.52 mg/L, respectively. These results also provide a valid approach for the resource recycling of the redundant long-root Eichhornia crassipes plants.
Graphical abstract
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2022
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IF 11.889
Chengyou Sun,Heng Cao,Chao Huang,Ping Wang,Jinglin Yin,Hao Liu,Haoran Tian,Haiyin Xu,Jian Zhu,Zhiming Liu
Development of an efficient and green adsorbent is of great significance for phosphorus removal and recovery from eutrophic water. This work prepared an eggshell modified biochar (ESBC) by co-pyrolysis of eggshells and corn stalk. ESBC exhibited an excellent performance for phosphorus adsorption over a wide pH range (5–13), and achieved a maximum adsorption of 557.0 mg P/g. The adsorption process was well fitted by pseudo-second-order model (R 2 > 0.962) and Sips model (R 2 > 0.965), and it was endothermic (ΔH 0 > 0) and spontaneous (ΔG 0 < 0) according to thermodynamic analysis. The column experiment confirmed the feasibility of ESBC as a filter media for phosphorus removal in flow condition, and obtained a P removal of 460.0 mg/g. Soil burial tests indicated P-laden ESBC has a good P slow-release performance (maintained for up to 25 days). Overall, ESBC has a promising application potential as an efficient adsorbent for phosphorus recovery and subsequently as a slow-release fertilizer.
研究领域:
环境科学
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农业科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Rui Zhang,Yihong Guo,Jianguo Yu,Sen Lin
Lithium/aluminum layered double hydroxide imprinted with SO 4 2- (ILDH) was prepared to enhance the lithium adsorption performance in low grade sulfate-type brines. The systematical characterization confirmed the ILDH had a morphology of two-dimensional lamella that was less randomly arranged than the traditional lithium/aluminum layered double hydroxide (TLDH). ILDH demonstrated a significantly enhanced adsorption performance in the long-term adsorption–desorption cycle replying on the excellent structural stability from the imprinting effects compared to TLDH. The adsorption capacity of ILDH was about 3.0 mg/g after 10 cycles, and the column experiments manifested that the Mg 2+ /Li + mass ratio could be significantly declined from 57.99 in the Yiliping sulfate-type brine to 2.36 in the desorption solution with 2.77 mg/g Li + adsorption capacity at room temperature .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL SPECIATION AND BIOAVAILABILITY
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2018
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IF 1.362
Xiaoqing Zhao,Shengze Yi,Shunan Dong,Hongxia Xu,Yuanyuan Sun,Xin Hu
Adsorption of levofloxacin (LEV) onto four types of magnesium (Mg)-impregnated biochars, fabricated via thermal pyrolysis of wood chips pretreated with MgSO4 was investigated. The Mg-impregnated biochars were characterized with various tools and techniques. Batch sorption experiments were conducted to determine the sorption kinetics and isotherms of LEV onto the Mg-impregnated biochars. The pseudo-second order kinetic model described the adsorption kinetic data better than the pseudo-first order kinetic model and the Elovich equation. Due to multi-mechanisms, the Freundlich model described the experimental isotherms better than the Langmuir model. The Langmuir maximum adsorption capacities of the Mg-impregnated biochars to LEV ranged from 7.38 to 25.2 mg g−1. In the fixed-bed column experiment, higher bed height and lower flow rate led to greater LEV removal. Findings from this work indicate that Mg-impregnated biochars can be used as an alternative adsorbent to effectively remove LEV from aqueous solutions.
研究领域:
环境科学
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水处理技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）