JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2019
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IF 4.865
Jizhou Zhang,Xianfa Ma,Lei Yuan,Dongxing Zhou
Cd 2+ pollution in aquatic environments can pose a serious threat to human health. Biochar can remove Cd 2+ from aquatic environments, but the Cd 2+ adsorption capacity of conventional biochar is low, therefore, we focused on exploring the Cd 2+ adsorption capacity of modified biochar. In this study, KMnO 4 was used to modify vermicompost biochar (VBC), and static adsorption tests for Cd 2+ were carried out. The biochar properties and its adsorption efficiency toward Cd 2+ before and after modification were studied by kinetics and isotherm model fitting, scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). Additionally, an adsorption mechanism was discussed. The results showed that the KMnO 4 -modification resulted in a successful loading of the vermicompost biochar with MnO 2 , which greatly improved its adsorption capacity for Cd 2+ . The adsorption of Cd 2+ by VBC and MVBC was a spontaneous, endothermic, and monolayer chemical adsorption process . Mineral precipitation mechanism accounted for the largest proportion, and CdCO 3 was the main precipitate. After modification the proportion of surface precipitation and other mechanisms (π-electron coordination and the inner/outer sphere surface coordination) increased，while adsorption via cation exchange, oxygen-containing functional groups, physical adsorption and electrostatic attraction reduced. Hence, KMnO 4 modification has a significant effect on the Cd 2+ adsorption behavior of vermicompost biochar.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
PLoS One
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2014
·Vol. 9
·期 4
·e95242
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IF 3.534
Hui-Xi Zou,Nan Li,Li-Hua Wang,Ping Yu,Xiu-Feng Yan
A fundamental investigation of the biosorption of Cd 2+ from aqueous solution by the edible seaweed Sargassum fusiforme was performed under batch conditions. The influences of experimental parameters, such as the initial pH, sorption time, temperature, and initial Cd 2+ concentration, on Cd 2+ uptake by S. fusiforme were evaluated. The results indicated that the biosorption of Cd 2+ depended on the initial Cd 2+ concentration, as well as the pH. The uptake of Cd 2+ could be described by the Langmuir isotherm model, and both the Langmuir biosorption equilibrium constant and the maximum biosorption capacity of the monolayer decreased with increasing temperature, thereby confirming the exothermic character of the sorption process. The biosorption kinetics follows the pseudo-second-order kinetic model, and intraparticle diffusion is the sole rate-limiting step for the entire biosorption period. These fundamental equilibrium and kinetic results can support further studies to the removal of cadmium from S. fusiforme harvested from cadmium-polluted waters.
研究领域:
环境科学
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海洋生物学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS RESEARCH
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2025
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IF 2.9
Ji Xinyuan,Han Yuliang,Fang Jiahui,Tian Dating,Hu Sheng
In this study, a novel ion-imprinted polymer (IIP) was synthesized using attapulgite (ATP) and chitosan (CS) as the substrates and methyl methacrylate (MMA) as the monomer. The IIP (MMA) was characterized by FTIR, XRD, SEM, TEM, BET, and XPS. Orthogonal experiments were analyzed to show that when initial concentration of Cd 2+ was 100 mg/L, and the adsorption time was 20 min, under the condition of IIP (MMA) and NIP (MMA) on Cd adsorption capacity, were 57.56 mg/g and 52.03 mg/g, at the same time, the adsorption capacity of Se were 17.14 mg/g and 15.86 mg/g, far below the Cd adsorption capacity. The results showed that IIP(MMA) synthesized with ATP and CS as substrates and MMA as functional monomer has been successfully synthesized and can be used for selective adsorption of Cd 2+ in water. Graphical abstract
Illustration of the imprint polymerization process
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 HAZARDOUS MATERIALS
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2020
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IF 9.038
Meiqing Chen,Juan Liu,Yingzhi Bi,Saeed Rehman,Zhi Dang,Pingxiao Wu
A multifunctional magnetic composite (0.3Ma-MgMnLDO-a) with the function of Cd 2+ adsorption and paracetamol (PAM) degradation was successfully fabricated. Surface morphology showed that Fe 3 O 4 agglomeration was overcome on composite. The composite had high specific surface area of 105.32 m 2 g −1 and saturation magnetization of 40 emu∙g -1 . 0.3Ma-MgMnLDO-a could reach Cd 2+ adsorption equilibrium within 5 min with 99 % removal rate. The maximum adsorption capacity was 3.76 mmol·g -1 (422.62 mg g -1 ), which apparently higher than that of Fe 3 O 4 -a and MgMnLDO-a, indicating that the Fe/Mn synergism results in excellent ability for Cd 2+ adsorption. Moreover, the composite could efficiently activate peroxymonosulfate (PMS) to rapid degrade PAM with the highest first-order rate constants (k obs = 0.116 min -1 ) and total organic carbon (TOC) removal rate (67.7 %), which also due to the contribution of Fe/Mn synergism in PMS activation. The cycling of Mn III /Mn IV and Fe II /Fe III played an important role in activating PMS to generate O 2 − • , 1 O 2 and OH for degradation. The composite exhibited both stable adsorption and catalytic performance on wide pH (3–9) and five reuse cycles. Notably, there was mutual promotion between Cd 2+ and PAM adsorption, while the coexistence of Cd 2+ had slight inhibition on PAM degradation. Overall, the magnetic composite had promising application for purifying heavy metals and pharmaceuticals.
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 SOLID STATE CHEMISTRY
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2021
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IF 3.498
Jie Ding,Xiaoxuan Yuan,Jinfeng Wang,Wenfeng Mao,Jianzhong Huo,Jingbo Zhang
Metal-Organic Frameworks (MOFs) have attracted much attention due to its large specific surface, flexible porosity and unsaturated coordination bonds. Cathodic deposition is a unique in-situ potential-driven synthesis method for the deposition of thin film MOFs; however, the gradually consumption of reactants during cathodic deposition might lead to unstable and uncontrollable reaction during thin-film MOF deposition. Herein, oxygen is selected as the initial reactant for the formation of OH − , which can result in gradually and successive formation of thin-film MAF-66 (Metal azolate framework-66), and the particle size and film thickness of the MAF-66 film can be easily tuned by the deposition time. Furthermore, the cathodic deposited thin-film MAF-66 show good adsorption property for heavy metal ions , with Cd 2+ as a representative species. The adsorption capacity can reach 32.3 mg/g (removal ratio: 69%) and the deposited MAF-66 film can achieve a satisfactory recovery degree with structural and morphological stability. In this way, a novel, environmental-friendly, and controllable cathode deposition method is developed for preparation of thin-film MAF-66, which also show great promise as a candidate for heavy metal ions adsorbent.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Zi-Xiong Zhou,Jun-Jie Yang,Nan-Dan Zhao,Yan Wang,Wen-Xiu Zheng,Yuan-Ru Guo,Qing-Jiang Pan,Shujun Li
To address the issue of toxic cadmium pollution and meet the need for rapid separation from water body, a magnetic bio-composite material, marked as CFeMg, was prepared via a facile method. It explicitly includes components of cellulose nanofiber (CNF), Fe 3 O 4 and Mg (OH) 2 . The microstructures and morphology were characterized and analyzed using XRD, FT-IR, SEM, and TEM. CNF was chemically coupled by Fe 3 O 4 , which together constructed the overall layered structure. Between layers were Mg(OH) 2 flakes attached. While dealing with Cd 2+ , q max of the best sample reached 361.5 mg g −1 with high adsorption efficiency. The roles of three components were explored and the adsorption mechanism was proposed. Assisted by magnetic CNF, it only took 3 min to efficiently and completely salvage the spent CFeMg sample from water after adsorption. Due to its high adsorption capacity and facile recovery performance, the prepared composite has promising application as water treatment.
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
CHEMOSPHERE
·
2020
·
IF 5.778
Hang Liu,Hua Yin,Shaoyu Tang,Hui Peng,Xiaolong Yu,Guining Lu,Zhi Dang
In this work, the prepared mesoporous TiO 2 was employed to eliminate the environmental risk induced by the combined pollution (tris-(2-chloroisopropyl) phosphate (TCPP) and Cd 2+ ). The prepared material was characterized by X-ray diffraction (XRD), UV–vis diffuse reflectance spectra (UV-DRS), Raman imaging spectrometer (Raman), N 2 adsorption/desorption isotherm and X-ray photoelectron spectroscopy (XPS). In the combined pollution system, the prepared TiO 2 simultaneously exhibited a higher adsorption and photocatalytic activity for Cd 2+ and TCPP at neutral condition, respectively. The adsorption of Cd 2+ and photo-degradation of TCPP by mesoporous TiO 2 followed pseudo-second-order and pseudo-first-order kinetics model, respectively. The removal efficiency of TCPP was improved from 67% to 100% when the concentration of co-existed Cd 2+ increased from 0.5 mg L −1 to 2 mg L −1 , due to the fact that the adsorbed Cd 2+ on the surface of TiO 2 scavenged electron and thus inhibited the photo-generated electron-hole pairs recombination. In addition, six degradation intermediates were determined by high resolution mass spectrum (HRMS) and potential transformation pathways of TCPP under the co-existence of Cd 2+ were proposed. The results suggested that rapid and high-efficient simultaneous removal of Cd 2+ and TCPP was feasible, which laid the basis for the remediation of other combined pollution in the future.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
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2023
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IF 4.6
Minwang Laipan,Qingze Chen,Ziyu Wang,Min Zhang,Mengyao Yuan,Runliang Zhu,Luyi Sun
Layered double hydroxides (LDHs) have been considered important sinks for ionic contaminants in nature and effectively engineered adsorbents for environmental remediation. The availability of interlayer active sites of LDHs is critical for their adsorptive ability. However, inorganic LDHs generally have a nano-confined interlayer space of ca. 0.3–0.5 nm, and it is unclear how LDHs can utilize their interlayer active sites during the adsorption process. Thus, LDHs intercalated with SO42–, PO43–, NO3–, Cl–, or CO32– were taken as examples to reveal this unsolved problem during Cd2+ adsorption. New adsorption behaviors and pronounced differences in adsorption performance were observed. Specifically, SO42–/PO43– intercalated LDHs showed a maximum Cd2+ adsorption capacity of 19.2/9.8 times higher than other LDHs. The ligand exchange of H+ (on the surface −OH) by Cd2+ and formation of Cd-SO42–/PO43– complexes led to the efficient removal of Cd2+. Interestingly, interlayer SO42– was demonstrated to be able to move to the edges/outer surfaces of LDHs, providing abundant movable adsorption sites for Cd2+. This novel phenomenon made the SO42– intercalated LDH a superior adsorbent for Cd2+ among the tested LDHs, which also suggests that LDHs with a nano-confined interlayer space can also highly utilize their interlayer active sites based on the mobility of interlayer anions, offering a new method for constructing superior LDH adsorbents.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
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