SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Jingling Huang,Weizhao Yin,Ping Li,Huaitian Bu,Sihao Lv,Zhanqiang Fang,Mingjia Yan,Jinhua Wu
In this study, nitrate mediated biotic zero-valent iron (Fe 0 ) corrosion was employed to enhance cadmium (Cd) removal from groundwater . In comparison with a 17.5% Cd(II) removal treated with abiotic Fe 0 , a 3.9 times higher Cd(II) removal of 86.2% was recorded in the nitrate-mediated biotic Fe 0 system. Solids phase characterization confirmed that biogenic minerals such as green rust and iron sulfide could be formed in the nitrate-amended biotic Fe 0 system, offering large amount of adsorption sites for Cd(II) removal. The decrease of nitrate concentration and the competition with cathodic hydrogen for biological nitrate reduction by extra organic substance such as sodium acetate both showed significant inhibition on Cd(II) removal, further proving that hydrogenotrophic denitrification was the main mechanism for enhanced Cd(II) removal. Besides, a relatively high Cd(II) removal efficiency was observed over a pH range of 5–8, and it increased with declining pH values. These results demonstrated that the bio-amended iron corrosion technology coupled Fe 0 -assisted H 2 production with hydrogenotrophic denitrification exhibited excellent Cd(II) removal capacity, which enabled this technology a promising potential for Cd(II)-contaminated groundwater treatment and an alternative strategy for Cd(II) and nitrate co-contaminated groundwater remediation .
研究领域:
环境科学
·
环境工程
·
微生物学
·
水污染治理
·
生物地球化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Lan Zhang,Junyu Liu,Keli Zhang,Xiang Dong,Yan Zhao,Qihong Cen
Solid waste derived ceramsites are a typical representative of the “treat waste by waste” concept, however, they have not been given enough attention due to high energy consumption, large carbon emissions and low efficiency. In this work, a hypoxic roasting method was used to prepare industrial solid derived ceramsite for the removal of heavy metal Cd(II) from aqueous solution. Compared with conventional ceramsite (CC), the novel hypoxic ceramsite (HC) exhibited higher specific surface area, more hydroxyl and aromatic functional groups, and more developed pore structure. It could effectively adsorb Cd(II) from aqueous solution in a wide pH range of 2–8, and the adsorption rate was 3 times that of CC. The maximum adsorption capacities of Cd(II) by CC and HC were 22.9 and 32.2 mg/g at 25 °C respectively. The adsorption mechanisms included electrostatic interaction, hydrogen bond reaction and complexation reaction. After five regeneration cycles, the removal efficiency of HC maintained 86.9 %. Furthermore, about 60 % of carbon was retained in HC, largely reducing carbon emissions. These findings reveal the energy conversation and environmental friendliness of this ceramsite, which strongly supports the development and popularization of hypoxic preparation methods for ceramsites.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2018
·Vol. 11
·期 2
·299
·
IF 2.467
Shiqiu Zhang,Xue Yang,Le Liu,Meiting Ju,Kui Zheng
Biochar is an excellent absorbent for most heavy metal ions and organic pollutants with high specific surface area, strong aperture structure, high stability, higher cation exchange capacity and rich surface functional groups. To improve the selective adsorption capacity of biochar to designated heavy metal ions, biochar prepared by agricultural waste is modified via Ionic-Imprinted Technique. Fourier transform infrared (FT-IR) spectra analysis and X-ray photoelectron spectroscopy (XPS) analysis of imprinted biochar (IB) indicate that 3-Mercaptopropyltrimethoxysilane is grafted on biochar surface through Si–O–Si bonds. The results of adsorption experiments indicate that the suitable pH range is about 3.0–8.0, the dosage is 2.0 g·L−1, and the adsorption equilibrium is reached within 960 min. In addition, the data match pseudo-second-order kinetic model and Langmuir model well. The computation results of adsorption thermodynamics and stoichiometric displacement theory of adsorption (SDT-A) prove that the adsorption process is spontaneous and endothermic. Finally, IB possesses a higher selectivity adsorption to Cd(II) and a better reuse capacity. The functionalized biochar could solidify designated ions stably.
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Qianjun Liu,Jiepeng Tang,Xiang Li,Qintie Lin,Rongbo Xiao,Min Zhang,Guangcai Yin,Yangmei Zhou
Lignin is a precursor of humus in soil and sediment. Lignin can be separated from vascular plants in the form of lignosulfonate via pulping processes. On the other hand, composites of iron oxide and organic matter can adsorb heavy metals, and thus influence the migration of these heavy metals in the environment. In this paper, a hematite/lignosulfonate composite (HLS) was prepared via coprecipitation to compare the adsorption performance of hematite (α-Fe 2 O 3 ) toward Cd(II) before and after the incorporation of lignosulfonate (LS). The HLS is found to exhibit a weakly crystalline structure and possess a large number of nanoscale particles . Specific surface area of HLS (291.97 m 2 /g) is about 11 times that of α-Fe 2 O 3 , and the pore volume of HLS (0.22 cm 3 /g) is twice that of α-Fe 2 O 3 . The adsorption of Cd(II) is well illustrated by the pseudo-second-order adsorption kinetics and the initial adsorption rate ( h ) of HLS is 13.83 times that of α-Fe 2 O 3 . The maximum adsorption capacities are significantly improved from 4.89–6.35 mg/g (α-Fe 2 O 3 ) to 39.03–53.65 mg/g (HLS). A greater affinity and more favorable association between Cd(II) and HLS is observed via fitting models. The incorporation of LS provides HLS with significantly better adsorption properties toward Cd(II) than α-Fe 2 O 3 , as is further confirmed by FT-IR and XPS characterization. Fe-O-O-H and Fe-O-H structures as well as more hydroxyl groups are observed, which promote the adsorption performance since the process are mainly influenced by complexation via coordination bonds.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 44
·38430-38436
·
IF 3.289
Changkun Liu,Xiaoyan Liang,Ji'an Liu,Yuying Liu,Jingjing Luo,Hong Zhu
A new type of cotton fiber with double functions of visual detection and efficient adsorption of cadmium (Cd(II)) ions in aqueous solutions was successfully prepared via the surface immobilization of 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin tetra(p-toluenesulfonate) (TPTP). The prepared multi-functional cotton fibers (denoted as C-TPTP fiber) were able to exhibit efficient capture ability for Cd(II) ions with obvious color changes, which confirmed the sensitive detection capability for Cd(II) in the adsorption process. The pH effect, the adsorption kinetics and isotherms of the C-TPTP fiber were also investigated, together with the corresponding color detections for the Cd(II) adsorption performances. The results showed that the C-TPTP fiber reached adsorption equilibrium within 1 hour with a maximum adsorption capacity of 0.4265 mmol g−1 as determined from the Langmuir isotherm model. The color of the C-TPTP fiber changed from brownish to dark green with the increase of the Cd(II) adsorption capacity. The C-TPTP fiber prepared in this paper shows great potential for the early warning and efficient removal of heavy metal ions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Hanghang Zhao,Peiyue Li,Fengmei Su,Xiaodong He,Vetrimurugan Elumalai
Microplastics (MPs) are one of the emerging classes of pollutants that can be infiltrated into any aqueous solutions from disposed toxic metals and antibiotics, further exacerbating the potential biotoxicity of MPs. However, the research on the interaction between MPs and various pollutants is limited. Therefore, in this study, the changes in toxicity of polybutylece terephthalate (PBT) MPs were assessed following adsorption of heavy metals and antibiotics. The adsorption behavior of Cd(II) and tetracycline (TC) on ultraviolet (UV) light-aged PBT was investigated. The results demonstrated that the Cd(II) adsorption behavior could be described by the pseudo-second-order kinetic and Langmuir isothermal models, while the TC adsorption behavior has well fitted using Elovich and Sips models. The whole adsorption process occurred via either external diffusion or internal diffusion. The interactions between aged PBT and pollutants were evaluated under different environmental conditions, such as solution pH and the concentrations of dissolved organic matter and cations. The amounts of Cd(II) and TC adsorbed were higher in the competitive systems than the single solution, which might attribute to the formation of Cd(II)–TC complexes and aged PBT functional group changes. The results of two-dimensional correlation spectroscopy (2D-COS) describes the sequence of functional group transformation during the uptake of Cd(II)–TC by aged PBT in binary systems. These findings identify a strong interaction between aged PBT and contaminants, establishing the potential fate of aged MPs under natural aquatic environment conditions.
研究领域:
环境科学
·
污染生态学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Hui Cao,Pu Yang,Tai Ye,Min Yuan,Jinsong Yu,Xiuxiu Wu,Fengqin Yin,Yan Li,Fei Xu
A novel monodispersed Cd(II) ion-imprinted polymer (IIP) was synthesized inside core-shell mesoporous silica (C-SMS) particles to improve the diffusion kinetics of the polymer. The synthesized IIP@C-SMS was characterized and subsequently used in solid-phase extraction (SPE) for the selective adsorption of Cd(II) in aquatic samples. The results indicated that IIP had been successfully assembled inside the C-SMS particles with a high specific surface area (546.3 m 2 g −1 ) and uniform mesoporous size (2.07 nm). The obtained IIP@C-SMS takes only 15 min to reach the adsorption equilibrium due to the highly developed mesoporous structure. IIP@C-SMS also presented a maximal adsorption capacity (201.9 μmol g −1 ) for Cd(II), which was much higher than that of NIP@C-SMS (80.3 μmol g −1 ). The relative selectivity coefficient of IIP@C-SMS for Cd(II)/M(II) (M = Cu(II), Pb(II), Cr(II), and Ni(II)) were 7.15, 8.70, 7.18, and 7.36, respectively, further confirming the satisfactory selectivity of IIP@C-SMS. The adsorption isotherms of IIP@C-SMS toward Cd(II) could be described by Langmuir model; whereas the adsorption kinetics could be fitted by the pseudo-second-order model, indicating chemisorption was the rate-limiting step. The FT-IR, ITC and XPS analysis further confirmed that the Cd(II)-induced cavities during the ion-imprinting process and the coordination between Cd(II) and –SH groups were the main adsorption mechanism. Furthermore, in real samples, IIP@C-SMS-SPE adsorbed approximately 93–104% of Cd(II). This work provides new insights for the design of novel macroporous sorbents for Cd(II).
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
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Jiujiang Ji,Guo Chen,Jun Zhao
To explore the effect of coexisted amino and thiol groups on adsorption of heavy metal, a novel magnetic nanoparticle was prepared by sequentially modification with (3-Chloropropyl) trimethoxysilan, polyetherimide, epichlorohydrin and thiourea. Subsequently, it was characterized by TEM, N 2 adsorption/desorption, FTIR Spectroscopy, zeta potential, and VSM. The maximum adsorption capacity for Pb 2+ , Cd 2+ and Cu 2+ reached 110.13 mg·g −1 , 40.23 mg·g −1 and 29.37 mg·g −1 , respectively. The adsorption of the magnetic nanoparticles with different surface group for heavy metals were compared, which indicated that the amino and thiol group played an important role in the adsorption of heavy metals. Especially, the adsorption capacity increased dramatically after modification with the thiol group, which was attributed to the synergistic coordination of −NH 2 and −SH. The adsorption kinetics is consistent with the quasi-second-order kinetics equation, and the adsorption thermodynamic process is consistent with the Langmuir isotherm equation. The effects of experimental conditions, such as pH, the concentration of metals, adsorption time and temperature, on adsorption of Pb 2+ were studied in detail. In addition, over 90% of removal rate was remained after 6 cycles. The magnetic nanoadsorbents was a promising nanoadsorbent with high adsorption speed, simultaneous adsorption of various heavy metals, strong anti-interference ability and reusability.
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
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Xiaofei Liu,Hua Yin,Hang Liu,Yuhao Cai,Xin Qi,Zhi Dang
Due to the coexistence of various heavy metals in the contaminated environment, it is essential to comprehensively study the multicomponent adsorption of heavy metals in order to tackle these combined pollutants. Herein, the adsorption processes of Pb(Ⅱ), Cu(Ⅱ) and Cd(Ⅱ) by biogenic hydroxyapatite (BHAp) were investigated in single and multicomponent systems. The maximum adsorption capacity for Pb(Ⅱ), Cu(Ⅱ) and Cd(Ⅱ) by BHAp in single system reached 311.16, 82.05 and 92.54 mg g −1 , respectively, while adsorption capacity for Cu(Ⅱ) and Cd(Ⅱ) in multicomponent system decreased more obviously than that of Pb(Ⅱ). Furthermore, the stability of Cu(Ⅱ) and Cd(Ⅱ) adsorbed on BHAp was indeed influenced in multicomponent system. By means of the characterization analysis, it was found that ion exchange was more instrumental in the adsorption processes of Cu(Ⅱ) and Cd(Ⅱ) in single system than in multicomponent system. Significantly, it was observed that the proportion of generally stable Pb(II) adsorbed on BHAp exceeded 95% in both single and multicomponent systems. This result might be due to the in-site growth of stable crystals of Pb x Ca 10–x (PO 4 ) 6 (OH) 2 , which was synergistically induced by surface functional groups and inorganic mineral of BHAp, and was unaffected by the coexistence of Cu(Ⅱ) and Cd(Ⅱ).
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Hong Zeng,Yue Tang,Wenying Zou,Chunxiao Wang,Han Tao,Yuangen Wu
V6O13 nanobelts with good crystallinity and distinct facets were prepared by a facile one-pot hydrothermal method and were first found to possess the peroxidase-mimicking activity. A simple colorimetric sensor using V6O13 nanobelts as catalyst was established for detecting Cd(II) and Pb(II) simultaneously in actual water samples. It was confirmed that V6O13 nanobelts could generate hydroxyl radicals (·OH) from H2O2 to oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a blue product. Heavy metals such as Cd(II) or Pb(II) could inhibit the peroxidase-mimicking activity of V6O13 nanobelts, making the sensing solution light blue or even colorless. The catalytic reaction of V6O13 nanobelts was exhibited to be a ping-pong mechanism, and the effect of heavy metals on V6O13 nanobelts was consistent with noncompetitive inhibition. The absorbance variation of a colorimetric sensor is relevant to the amount of heavy metals, which enabled us to easily discriminate whether Cd(II) or Pb(II) exceeded the maximum permissible quantity within 20 min. The limit of detection (LOD) of the constructed colorimetric sensor was determined to be 1.89 μg·L–1 for Cd(II) and 2.11 μg·L–1 for Pb(II). The colorimetric sensor showed distinguished selectivity for other competitive metal ions and was validated for detecting heavy metals in several types of actual water samples.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Yu Huang,Jiangnan Peng,Mingyan Qin,Wen Xiong,Chao Wang,Yaxin Qin,Wei Liu
The valorization of construction solid wastes into functional materials presents a dual opportunity for environmental remediation and sustainable infrastructure development. Herein, we successfully repurposed asphalt-based solid waste into calcium-enriched carbonaceous adsorbent through sequential pyrolysis (C Asp ) and ball-milling (C Asp, bm ) techniques for 4 h at a constant rotational speed of 550 rpm. It was noteworthy that both the C Asp and C Asp, bm demonstrated an ultrafast adsorption efficiency for Cd(II), achieving equilibrium within 5 min. The maximum adsorption capacity (207.54 mg/g) was obtained through pyrolysis at 900 ℃ followed by ball-milling (C Asp, bm -900). The adsorption process closely followed the pseudo-second-order kinetic model and Freundlich isotherm, characterized by an ultrafast adsorption phase succeeded by a slower equilibrium stage. The adsorption process was spontaneous and involved multilayer adsorption, primarily governed by chemisorption mechanisms. The analysis of ions species and characterizations revealed that both pyrolysis and ball-milling processes enhanced the removal efficiency of Cd(II) by altering the surface composition and functional groups, specific surface area, and surface defects of C Asp and C Asp, bm . The primary mechanisms for Cd(II) adsorption on C Asp, bm -900 included ion exchange with Ca(II), precipitation in conjunction with CO 3 2- , and electrostatic attraction. Unfortunately, the presence of Cu(II) and Pb(II) significantly inhibited the removal of Cd(II), attributed to their markedly higher electronegativity. This study proposes a promising strategy for fabricating cost-effective and high-efficiency adsorbents through the upcycling of waste asphalt into functional materials, thereby enabling the effective removal of heavy metals from wastewater.
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Shiyu Cao,Lin Zhang,Cancan Ling,Furong Guo,Meiqi Li,Chuan Liang,Jundi Cheng,Yanbiao Shi,Hongwei Sun,Lizhi Zhang
Mackinawite (FeS) is an excellent Cd(II) removal material but suffers from rapid reactivity loss. Herein, we demonstrate that rational surface preoxidation could enhance the single maximum adsorption capacity of mackinawite from 625.0 to 666.7 mg g–1 and also promote its air stability and reusability for long-term application. The Cd(II) removal processes were carefully characterized with a multifunctional in situ electrochemical device, theoretical calculation, and extended X-ray absorption fine structure (EXAFS) spectroscopy. Characterization results revealed that surface preoxidation treatment changed the Cd(II) removal mechanism from ion exchange to ion-exchange coupled surface adsorption because surface preoxidized FeS possessed abundant surface −OH sites. This extra surface adsorption process offered surface preoxidized FeS a superior long-term Cd(II) removal performance of 1290.5 mg g–1 in 5 successive cycles, much higher than that of pristine FeS (842.4 mg g–1). This study highlights the importance of surface oxidation on the Cd(II) removal performance of mackinawite and also opens a new strategy to design and produce high-performance mackinawite nanocrystals for pollutant control and environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）