WATER RESEARCH
·
2018
·
IF 7.051
Yuanfeng Wei,Hui Liu,Chengbin Liu,Shenglian Luo,Yutang Liu,Xingwen Yu,Jianhong Ma,Kai Yin,Haopeng Feng
Although oxidation of As(III) to As(V) is deemed necessary to promote arsenic removal, the oxidation process usually involves toxic byproducts, well-defined conditions, energy input or sludge generation. Moreover, extra operations are required to remove the resulting As(V). A heterogeneous catalytic process of CuFe 2 O 4 with peroxymonosulfate (PMS) is established for As(III) oxidation and adsorption. The PMS can be activated by CuFe 2 O 4 to generate radical species for As(III) oxidation. The CuFe 2 O 4 /PMS has a stronger affinity for arsenic than CuFe 2 O 4 alone. Oxidation and adsorption promote each other. As a result, the heterogeneous catalytic process is more efficient for As(III) removal than a preoxidation of As(III) followed by adsorption. The adsorption capacity for As on CuFe 2 O 4 /PMS reached up to 63.9 mg/g, which is much higher than that of As(III) (36.9 mg/g) or As(V) (45.4 mg/g) on CuFe 2 O 4 alone. The process can work effectively over a wide range of pH values (3–9) and temperatures (10–40 °C). Coexisting ions such as sulfate, carbonate, silicate and humic acid have an insignificant effect on As(III) removal. The As(III) (1415 μg/L) can be completely oxidized to As(V) and rapidly removed to below 10 μg/L (less than 15 min) using CuFe 2 O 4 (0.2 g/L)/PMS(100 μM). Moreover, the As(III) (50 μg/L) can be completely oxidized and removed within 1 min. The proposed process is easily applicable for the remediation of As(III)-contaminated water under ambient conditions.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Tiantian Nie,Pulin Hao,Zhendong Zhao,Wenjun Zhou,Lizhong Zhu
The bamboo biochars pyrolyzed at 400 °C and 600 °C (BC400 and BC600) were modified by hydrogen peroxide (H 2 O 2 ) to obtain the oxidized biochars. Biochar stability and the effect of oxidation treatment on the adsorption and co-adsorption of tetracycline (TC) and Cu 2+ onto biochars were investigated. The calculated carbon loss of biochars after oxidation treatment indicated that BC600 presented higher carbon stability than BC400 due to the condensed aromatic structure of biochar. Moreover, oxidation treatment introduced O-containing functional groups on biochar surface, but destructed the aromatic structures of oxidized biochars, which in turn affected the adsorption capacity of biochars for TC and Cu 2+ . Oxidation treatment obviously enhanced the adsorption of TC and Cu 2+ onto BC400 owing to the increase of O-containing functional groups, but significantly decreased TC and Cu 2+ adsorption onto BC600 because of the decreased π - π dispersive forces between biochar and adsorbate. The promotion effect of Cu 2+ on TC adsorption onto BC400 changed into inhibition effect after chemical oxidation owing to the pore blockage. However, the promotion degree of Cu 2+ for TC adsorption onto BC600 was enhanced through oxidation treatment due to electrostatic attraction and complexation. Meanwhile, oxidation treatment reduced the inhibition degrees of TC for Cu 2+ adsorption onto biochars, which was attributed to the increased amount of electron-rich groups. The results are helpful for the application of biochars in the soils remediation .
研究领域:
环境科学
·
土壤修复
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Dong Yang,Peng Gao,Xin Ren,Yifan Niu,Zhenfen Wu,Zhenggang Gu,Hongbo Peng
The wide application of endocrine disruptors (EDs) has recently created great public concerns because of their toxicities. Previous studies have stated that the effect of oxygen-containing functional groups of carbon nanotubes (CNTs) for Bisphenol A (BPA) sorption, but no study has been quantified the exact contribution of the oxygen-containing functional groups. Moreover, the role of solvents on the adsorption of BPA should be considered. Considering the well properties of CNTs, graphitized (MG), carboxylated (MC) and hydroxylated (MH) multi-walled CNTs were selected as model adsorbents, BPA was used as model adsorbate. Solubility and single point adsorption coefficient (logKd) of BPA were n-hexadecane > water > methanol, suggesting that hydrophobic interaction was the main mechanism for BPA sorption on CNTs. For different functional groups of CNTs, π-π interaction between MH and BPA may be stronger than that of MC, and thus the sorption of BPA on MH was higher than that of MC. Moreover, hydrogen bond resulted in the higher adsorption of BPA on MH when compared with MC. The oxygen-containing functional groups of CNTs played a key role for BPA sorption in methanol because the values of contribution were 20%–45% for -OH and were 5%–25% for -COOH. In n-hexadecane, other factors such as hydrophobic interactions should be considered because the contribution percentages of -OH were ca.15% and the values for -COOH were ca.10%. The results are expected to provide important information on the interaction of EDs and CNTs.
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
WATER RESEARCH
·
2022
·
IF 13.4
Yanji Jiang,Shi Zhou,Jiao Fei,Zhiming Qin,Xianqiang Yin,Huimin Sun,Yuebing Sun
The adhesion of surfactant molecules on the microplastics surface is affected by the surface structure of the microplastics. Little is known about the mobility of different microplastics in the medium under surfactants. In order to reveal the migration of different microplastics under the action of surfactants, the study selected five kinds of microplastics (polyethylene (PE), polypropylene (PP), polystyrene (PS), polytetrafluoroethylene (PTFE), polymethyl methacrylate (PMMA)) and two kinds of surfactants (cetyltrimethylammonium bromide, CTAB and sodium dodecyl benzene sulfonate, SDBS) as the research objects. The column experiment was used to explore the transport behavior of microplastics under different concentrations of surfactants and the convection dispersion model was used to simulate. The dynamic contact angle of the surfactant solution on the microplastics was measured and the adhesion work was calculated by the Young-Dupre equation to reveal the underlying mechanism of microplastics retention in the presence of surfactants. The results showed that the transport ability of microplastics followed the order of PTFE
研究领域:
环境科学
·
化学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
·
2022
·Vol. 73
·期 7
·1153-1162
·
IF 1.832
Cunhua Wei,Ge Xu,Jin Yu
A novel triazine derivative, 2, 4-diamino-6-dodecamido-1, 3, 5-triazine (DT), is synthesized by the dehydration condensation of melamine and lauric acid, and its inhibitive performances for the corrosion of Q235 carbon steel in 1 mol/L HCl solution is investigated by electrochemical polarization, electrochemical impedance spectroscopy, scanning electron microscopy, and atomic force microscope. The results reveal that its best inhibition efficiency reaches 96.98% at a concentration of 2.5 g/L. The calculation results of kinetic and thermodynamic parameters indicate that the adsorption of DT on carbon steel surface obeys Langmuir adsorption isotherm with both physical and chemical adsorption. It is demonstrated that long-chain amide (>8C) substituted 1, 3, 5-triazine derivative has the synergistic corrosion inhibition effect of the surface fixation on metal iron and the hydrophobic adsorption layer.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Zhangzhen Wu,Zhi Guo,Dazhuang Dong,Feiyan Wu,Jie Li,Xue Yang
Microorganisms easily colonize microplastics in aquatic environment, forming microplastic circles with a high affinity for contaminants. However, the mechanism of antibiotic adsorption by biodegradable and non-biodegradable microplastics under biofilm loading is unclear. Here, virgin polyethylene (V-PE) and virgin polylactide (V-PLA) are non-biodegradable and biodegradable microplastics, respectively, and we investigated their biofilms formation in an aquatic environment. And the adsorption interaction of tetracycline hydrochloride (TCH) or ciprofloxacin (CIP) using biofilm covered polyethylene (B-PE) and compared it with biofilm covered polylactic acid (B-PLA). The biofilms changed the surface properties and morphology of the microplastics and enhanced their adsorption capacity for antibiotics. The order of adsorption capacity was B-PE > B-PLA > V-PE > V-PLA. Compared with V-PE and V-PLA, the adsorption capacity of B-PE and B-PLA for TCH increased by 0.346 and 0.267 mg/g, and adsorption capacity for CIP increased by 0.308 and 0.111 mg/g, respectively. The adsorption behaviors of B-PE and B-PLA fitted the pseudo-second-order kinetic equation well, and also fitted the Langmuir isotherm equation and the Freundlich isotherm equation, respectively. In addition, hydrogen-bond interaction, electrostatic interaction and hydrophobic interaction were found to dominate the adsorption of antibiotic by biofilm covered microplastics. Our study revealed the adsorption interaction between biofilm covered microplastics and antibiotics and provided basic information for ecological risk assessment of different biofilm covered microplastics.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 128
·期 6
·3925-3932
·
IF 1.289
Shenghua Lv,Haobo Ju,Chaochao Qiu,Yujuan Ma,Qingfang Zhou
Preparation and characterization of polycarboxylate superplasticizers of IPCs ( copolymer of itaconic acid and allyl polyoxyethylene ether) and MPCs (copolymer of maleic anhydride and allyl polyoxyethylene ether) are shown. The difference between IPCs and MPCs is that half of the carboxyl groups of IPCs indirectly connect to the main chains through methylene. The effects of the carboxyl group-main chain connection mode on the properties of IPCs and MPCs were investigated by assessing the paste fluidity and the pore diameters and compressive strength. The interaction between IPCs (MPCs) and cement were revealed by zeta-potential and the adsorption amount. The results indicated that the indirect connection mode favorably improved paste fluidity, decreased pore diameters, and increased the compressive strength compared with the direct connection mode. This is likely because that when carboxyl groups are connected to the main chains indirectly, more moving space allows easier adsorption on cement particles. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2016
·Vol. 39
·期 3
·755-761
·
IF 2.004
Haijun Xu,Shenmei Sun,Qijun Yu,Jiangxiong Wei
Two types of polycarboxylate superplasticizers (PCEs) with β-cyclodextrin (β-CD) as pendant groups were synthesized by different methods to employ monovinyl β-CD monomer (MA-β-CD), and their dispersion robustness toward clay was evaluated by the dosage to achieve the specific spread value of the cement paste in the presence of 3 wt% kaolin. The interaction mechanism was investigated by X-ray diffraction analysis and adsorption measurement, and it was proposed that the sorption of PCEs on the surfaces of kaolin particles was weakened by β-CD pendants due to their pronounced steric hindrance effect. The results demonstrated that PCE with higher contents of β-CD pendants, which was synthesized via partially replacing poly(ethylene oxide) monomer by MA-β-CD, was more tolerant toward kaolin. POLYM. COMPOS., 39:755–761, 2018. © 2016 Society of Plastics Engineers
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Kai Jiang,Yuexin Han,Jie Liu,Yan Wang,Wencheng Ge,Deju Zhang
This study concentrated on a thorough surface investigation to ascertain how pH affected the surface characteristics and floatability of pyrite. To assess the impact of pH on the adsorption of collector on the surface of pyrite, a special computational model was also created. Although it varied at various medication dosages, the flotation recovery of pyrite indicated a reduction with rising pH, according to the results of the flotation studies. Contact angle and other tests revealed that as pH rose, the surface of pyrite slightly oxidized to expose corrosion pits, hydrophilic oxidation products (Fe(OH) 3 , SO 4 2- , etc.) gradually deposited on the surface, the surface hydrophilicity of pyrite increased rapidly, and the adsorption of xanthate was inhibited. In accordance with the experiments, the adsorption strength trend of xanthate on the surface of pyrite was supported by the findings of DFT calculations. As pH rose, the interaction distance between xanthate and surface gradually widened and the force gradually decreased. Additionally, the hydroxylation of surface became increasingly significant and its oxidation trend sharpened with increasing pH. The findings of this investigation open the door for future research on related sulphide minerals by illuminating the variations in surface properties of pyrite at various pH levels and its interaction with xanthate.
研究领域:
矿物学
·
计算化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 10
·1429
·
IF 4.034
Yuehua Deng,Yani Li,Wenjie Nie,Xiang Gao,Shentan Liu,Xiaochun Tan,Mingming Chen,Dongzhuang Hou
As a nano-adsorbent, magnetic graphene oxide (GO/Fe3O4) was synthesized to potentially adsorb propranolol (PRO) from water. The synthetic material was characterized by SEM, TEM, VSM, FTIR, XRD, zeta potential, and XPS. The environmental factors, such as pH, humic acid concentration, PRO concentration, and contact time, were investigated regarding their effect on the adsorption process. The kinetics data fitted the pseudo first-order and second-order kinetics equations. The Langmuir equation, the Freundlich equation, and the Sips equation were used to analyze the adsorption isotherms. Electrostatic attraction, hydrogen bonding, and the π–π interaction all contributed to the adsorption process of PRO onto GO/Fe3O4. The discovery of this study emphasized the feasibility of GO/Fe3O4removal of PRO and expanded the scope of the application of GO.Keywords:magnetic graphene oxide;propranolol;Fe3O4;adsorption
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
RSC Advances
·
2016
·Vol. 6
·期 108
·106921-106927
·
IF 3.289
Guobing Xing,Wenping Wang,Jie Xu
A monomer containing a tertiary amine group was employed to synthesize polycarboxylate superplasticizers (PCEs) preparing from acrylic acid (AA), itaconic acid (IA) and 2-(dimethylamino) ethyl methacrylate (DMAM). The terpolymers were characterized and tested for their dispersion performance in the absence and presence of montmorillonite (Mmt). These novel PCEs displayed better dispersion performances in cement in the presence of Mmt than did conventional PCE. Adsorption measurements and X-ray diffraction analysis suggested that these novel PCEs interacted with Mmt only via surface adsorption, in contrast to the interaction of conventional PCE with Mmt by both surface adsorption and chemical intercalation.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Jackson Nkoh Nkoh,Zhineng Hong,Hailong Lu,Jiuyu Li,Renkou Xu
The adsorption of glycine, cysteine and glutamic acid by gibbsite and montmorillonite was studied as a function of amino acid concentration and solution pH. Zeta potential measurements, X-ray diffraction (XRD), and attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopic analysis were performed to deduce the mechanism(s) of adsorption and to observe changes in the basic structure of the minerals after interaction with amino acids. The ATR-FTIR analysis revealed that both NH 3 + and COO − groups of amino acids were very vital for interactions with the surface of gibbsite and montmorillonite. XRD analysis revealed that the formation of mineral-amino acid composites decreased the d 001 value of montmorillonite from 17.95 to 14.2 (glycine), 15.49 (cysteine), and 15.22 Å (glutamic acid). This observation suggests that amino acid adsorption induced structural stress on montmorillonite and expanded its interlayer space . Also, the adsorption of glycine and cysteine to gibbsite and montmorillonite increased their zeta potentials at pH 5.0 while glutamic acid decreased the zeta potentials. Thus, amino acid-induced increase/decrease in the surface positive/negative charge of the minerals indicates that chemical bonds were formed between glycine, cysteine, glutamic acid and the minerals. The findings of this study can serve as a reference for studies related to understanding the bonding interactions and distribution of different amino acids in soils.
研究领域:
土壤科学
·
生物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）