Processes
·
2021
·Vol. 9
·期 10
·1829
·
IF 2.847
Liwen Zheng,Yongchao Gao,Jianhua Du,Wen Zhang,Yujie Huang,Qingqing Zhao,Luchun Duan,Yanju Liu,Ravi Naidu,Xiangliang Pan
The chitosan–EDTA modified magnetic biochar (E–CMBC) was successfully used as a novel adsorbent to remove heavy metals. The adsorption behaviour and mechanisms of E–CMBC to Cd2+, Cu2+and Ni2+were performed in single and binary system in aqueous solutions. In single–metal system, the adsorption process of Cd2+, Cu2+and Ni2+on E–CMBC fitted well with the Avrami fractional–order kinetics model and the Langmuir isotherm model. The measured maximum adsorption capacities were 61.08 mg g−1, 48.36 mg g−1and 41.17 mg g−1for Cd2+, Cu2+and Ni2+, respectively. In binary–metal system, coexisting ions have obvious competitive adsorption behaviour on E–CMBC when the concentration of heavy meal beyond 20 mg L−1. The maximum adsorption capacities of the heavy metals were found to be lower than that in single–metal system. The order of the competitive adsorption ability was Cu2+> Ni2+> Cd2+. Interestingly, in Cd2+–Cu2+system the earlier adsorbed Cd2+could be completely replaced by Cu2+from the solution. Different competitive adsorption ability of those heavy metal were due to the characteristics of heavy metal and resultant affinity of the adsorption sites on E–CMBC. The adsorption mechanism indicated that chemical adsorption played a dominating role. Therefore, E–CMBC could be a potential adsorbent for wastewater treatment.Keywords:modified biochar;heavy metals;competitive adsorption;mechanisms
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Weiqing Liu,Haiyan Jiang,Jing Shi,Bingjun Lu,Hongfeng Cai,Zhimin Mao,Fantai Kong
The photoanode of a dye-sensitized solar cell is composed of titanium dioxide and a dye adsorbed on the surface. Dye molecules, such as N719 dye, usually agglomerate due to H bond and other factors, forming a multilayer adsorption structure, leading to light loss and electron injection loss. Adding a co-adsorbent to the dye, such as chenodeoxycholic acid (CDCA) molecule, is an effective method to prevent the aggregation of the dye. However, the mechanism of interaction between CDCA and N719 is still unclear. Therefore, in this paper, the mechanism of interaction of CDCA and N719 was studied in detail using quartz crystal microbalance (QCM) combined with UV–vis absorption spectrum. The adsorption kinetics constant of the co-adsorbent CDCA was obtained, and it was found that the adsorption process of CDCA on the surface of TiO2 was more consistent with the Freundlich isothermal adsorption model. Under the condition of continuous adsorption and desorption, the dynamic constants of CDCA adsorption did not change obviously, but molecular rearrangement might occur. In the process of sequential competitive adsorption, pretreatment with CDCA had a small influence on the adsorption kinetic constants of N719. There is competitive adsorption between CDCA and N719 on the surface of TiO2. In the process of mixed adsorption, the interaction mechanism between CDCA and N719 is a cooperative mechanism in the solution and competitive mechanism on the TiO2 surface. In addition, the results of this experiment also showed that CDCA could accelerate the adsorption time of N719. The experimental results in this paper may be helpful for understanding the mechanism of CDCA.
研究领域:
材料科学
·
光化学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·
IF 3.5
Yu Fengqin,Xie Qiang,Zhang Zhijun,Yang Shuai,Liu Jinchang,Ren Qiang,Liang Dingcheng
Zeolites are widely used for removing volatile organic compounds (VOCs) in industrial processes. However, the understanding of the competitive adsorption behavior of multicomponent VOCs on zeolites remains insufficient. This study employed grand canonical Monte Carlo simulation to investigate the adsorption behaviors of nonpolar benzene and polar ethyl acetate in both pure and mixed forms on FAU, LTA and MFI zeolites. The effects of zeolite topology, Si/Al ratio, and compensating cations on competitive adsorption were explored. The results revealed that the adsorption capacities of benzene and ethyl acetate on FAU and LTA zeolites gradually increased with increasing Si/Al ratio, consistent with the increasing trends in their specific surface areas and pore volumes. However, the MFI zeolite shows no significant change in these properties with varying Si/Al ratios. Zeolites modified with Ca 2+ significantly improved the benzene and ethyl acetate adsorption capacities, while impact on ethyl acetate adsorption is minimal. Zeolites modified with K + reduced the adsorption capacities for both benzene and ethyl acetate. For binary mixtures, Na-FAU-1, Na-LTA-1, and Na-MFI-15 exhibited high selectivity for ethyl acetate. Increasing the Si/Al ratio and K + -modification reduced the adsorption selectivity of these zeolites for ethyl acetate. Ca 2+ -modification reduces the selectivity of LTA-1 toward ethyl acetate, with minimal impact on FAU-1 and MFI-15. Dynamic adsorption experiments with commercial zeolites confirm the reliability of the simulation results in predicting benzene and ethyl acetate adsorption performance. This study is expected to provide guidance for selecting appropriate zeolites for VOCs mixtures in practical applications. Graphical abstract
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2025
·
IF 8.5
Shiyao Du,Dongfang Jia,Xin Guo,Jinke Wang,Zhibin Chen,Lingwei Ma,Dawei Zhang
The coupling effect of adipic acid and Cl - on the corrosion of SAC305 solder alloy is systematically investigated. Electrochemical measurements prove that Cl - could completely destroy the protectiveness of adipic acid and accelerate metal corrosion. Morphology characterizations and XPS analyses verify that the amount of adsorbed adipic acid on the metal surface is largely reduced due to competitive adsorption of Cl - . TEM and Mott-Schottky tests further reveal that the defect density of the oxide film developed in Cl - environment is three times higher than that in adipic acid, which is responsible for the faster anodic dissolution.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Mi Wu,Shifeng Zhao,Ruisen Jing,Yifei Shao,Xijuan Liu,Fengzhu Lv,Xinxin Hu,Qian Zhang,Zilin Meng,Aiju Liu
As antibiotics continue to be released into soils, it poses a potential threat to human and animal health. The migration-transformation of contaminants in soils is strongly affected by adsorption on clay. Tetracycline (TC) and ciprofloxacin (CIP) which are extensively used have been attracted attention recently. Based on adsorption kinetics, isotherm, FT-IR, XRD and molecular simulation, the intercalation and environmental behavior of TC or CIP by montmorillonite (Mt) as single or mixed substance were studied and the adsorption mechanism was also proved. In the mixed system, the relationship between TC and CIP was a competition, but no preferential adsorption. The interaction between antibiotics in interlayer and the adsorption energies were simulated and calculated by molecular simulation to reveal the experimental results.
研究领域:
环境科学
·
土壤学
·
分子生物学
✓ 已验证
DOI
高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2019
·Vol. 42
·期 9
·1435-1445
·
IF 2.371
Cao Hanfei,Ji Yingchun,Zhou Jingwei,Zhuang Wei,Niu Huanqing,Gao Nan,Chen Yong,Liu Dong,Zhu Chenjie,Chen Xioachun,Ying Hanjie,Wu Jinglan
Vanillin and syringaldehyde are widely used as flavoring and fragrance agents in the food products. The potential of a macro-mesoporous adsorption resin was assessed for separation of these binary mixtures. This work focuses on modeling of the competitive adsorption behaviors and exploration of the adsorption mechanism. The characterization results showed the resin had a large BET surface area and specific pore structure with hydrophobic properties. By analysis of the physicochemical properties of the solutes and the resin, the separation mechanism was mainly contributed by hydrophobic effect. Subsequently, the competitive Langmuir isotherm model was used to fit the competitive adsorption isotherms. The pore diffusion coefficient was obtained by macropore diffusion model. Afterwards, a mathematical model was established to predict the breakthrough curves of the binary mixture at various operating conditions. The data and model presented are valuable for design and simulation of the continuous chromatographic separation process.
研究领域:
食品科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 96
·93894-93904
·
IF 3.289
Jianming Pan,Jialu Luo,Jun Cao,Jinxing Liu,Wei Huang,Wenli Zhang,Lili Yang
Hydrophilic urea-formaldehyde macroporous foams (UFMF) were simply synthesized by templating oil-in-water Pickering high internal phase emulsions (HIPEs) solely stabilized by lignin particles. Morphology and structure of the UFMF can be easily tailored by varying the experimental compositions of Pickering HIPEs and polymerization time. Due to their porous matrix, hydrophilic surface, and high content of binding groups (such as hydroxyl groups and carbonyl groups), as-prepared UFMF was adopted for the removal of three phenolic compounds (PCs) from aqueous solution. The influences of pH, solution temperature, contact time, and initial concentration of 2,4,5-trichlorophenol (2,4,5-TCP), 2,4,6-trichlorophenol (2,4,6-TCP) and 4-nitrophenol (4-NP) on adsorption capacity and competitive adsorption of multi PCs were investigated via the batch mode experiments. The adsorption kinetics and adsorption isotherms fit well by a pseudo-second-order model and Langmuir model, respectively. The max adsorption capacity of 2,4,5-TCP, 2,4,6-TCP and 4-NP at 25 °C are 116.3 mg g−1, 78.74 mg g−1, 29.41 mg g−1, respectively, and their adsorption rate follows the order 2,4,5-TCP > 2,4,6-TCP > 4-NP. Moreover, the group type and position effects both influence the adsorption, and follow the order: 2,4,5-position substitution of chloride > 2,4,6-position substitution of chloride > 4-position substitution of nitro-group, showing that the substitution with the more groups has the higher adsorption affinity.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Shuran He,Yongtao Li,Liping Weng,Jinjin Wang,Jinxian He,Yonglin Liu,Kun Zhang,Qihong Wu,Yulong Zhang,Zhen Zhang
In present study, the feasibility of applying a natural adsorbent with Fe 3+ modification (Fe 3+ -modified argillaceous limestone, FAL) on the competitive adsorption of heavy metals (i.e., Cd 2+ , Pb 2+ and Ni 2+ ) was evaluated. The current results revealed an efficient adsorption on Cd 2+ , Pb 2+ and Ni 2+ in mono-metal system. Further experiments demonstrated a high selectivity of Pb 2+ during the competitive adsorption of Cd 2+ , Pb 2+ and Ni 2+ . The adsorption selectivity of the metal ions followed the order of Pb ≫ Cd > Ni. In addition, both pH and ionic strength are important factors affecting the metal adsorptions. It is interestingly that various NOMs (i.e., humic acid (HA) and glycine (Gly)) exerted different effects on the adsorption behaviors, probably due to the different affinities for Pb 2+ , Cd 2+ and Ni 2+ and the redistribution of newly-formed metal-DOM complexes. X-ray photoelectron spectroscopy (XPS) analysis together with X-ray diffraction (XRD) and energy dispersive spectrometer (EDS) analysis revealed that the metal adsorptions were mainly regulated via the synergistic mechanisms of ion exchange by Na + , Ca 2+ , and Al 3+ , precipitation to form CdCO 3 and Pb 2 (OH) 2 (CO 3 ) 2 , as well as complexes of FAL-OPb and FAL-ONi by hydroxyl groups on the surface of FAL. The application of FAL would be a promising option in leading to an efficient heavy metal removal.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2018
·
IF 3.886
Fuping Tian,Qiaofeng Ru,Chenxia Qiao,Xin Sun,Cuiying Jia,Yu Wang,Yifu Zhang
This work presented the synthesis of Ni-based metal-organic framework material with a paddle-wheel structure Ni 3 (BTC) 2 (Ni-BTC) and its application in thiophene (TP) adsorption from gasoline distillate by batch method. Adsorption isotherms of TP, cyclohexene , and toluene in cyclohexane onto Ni-BTC were conducted at 298–308 K to interpret the different effect of cyclohexene and toluene on TP adsorption. The results showed that, compared with cyclohexene, toluene addition in model gasoline led to a more evident decline in sulfur capacity of Ni-BTC, which is opposite to isostructural HKUST-1. The adsorption isotherms of TP, cyclohexene and toluene fit Langmuir model, S-type model and Temkin model well, respectively, indicating that the adsorption mechanisms of TP and the two competitors are different from one another. The adsorption capacities on Ni-BTC followed the order of cyclohexene < toluene < TP at the same equilibrium concentrations , implying the order of the adsorption affinities, which is in good agreement with the different extent of influence by the two competitors. The enthalpy of TP adsorption on Ni-BTC was estimated to be −80.01 kJ/mol, almost twice that on HKUST-1. The poor reusability of Ni-BTC in batch experiment, which is owing to its sensitivity to the air, can be prevented from regenerating used Ni-BTC in fixed-bed reactor by N 2 flow. The difference between Ni-BTC and HKUST-1 in maximum adsorption capacity ( q 0 ), Δ H of TP adsorption, and stability demonstrates that the central metal in isostructural MOFs plays a key role in adjusting the desulfurization performance, which may open up a potential avenue for the development of MOF-based adsorbents with superior desulfurization performance.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Quan Chen,Peng Yi,Wei Dong,Yihui Chen,Liping He,Bo Pan
The discharge and consequent occurrence of antibiotics in the environment has led to increasing concerns because their presence can promote the development of resistance genes, which in turn pose a significant health risk. A key process to control the transport and risk of antibiotics is adsorption. Thus, we investigated the adsorption mechanisms of six typical antibiotics onto a MnFe 2 O 4 @cellulose activated carbon (CAC) hybrid combining batch adsorption experiments and quantum chemical calculations. In the single-adsorbate adsorption systems, the solid-phase concentrations of the adsorbates varied from 152.8 to 395.7 mg/g, which were dependent on the adsorption affinity and molecular structures or sizes of the antibiotics. Chemisorption was the main adsorption mechanism, and it was driven by p-d electronic conjugation and cation-π interactions. In the competitive adsorption systems, the solid-phase concentrations of both primary (sulfamethazine, SMT) and secondary (the other five antibiotics) adsorbates decreased significantly. The decrease ratio of SMT varied from 15.42% to 67.28% while that of the secondary adsorbates varied from 14.13% to 52.74%. The “competition” strength was depended on the adsorption energy and the overlapping of adsorption sites. We believe that these findings will provide a better understanding of the adsorption characteristics of typical antibiotics and facilitate the strategy developing for the removal of antibiotics from the aqueous phase.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Hongjuan Bai,Junhang Chen,Zhantao Wang,Liujie Wang,Edvina Lamy
Simultaneous adsorption of coexisting organic dyes from industrial wastewater is challenging, and the mechanisms of the coadsorption of these dyes remain unclear. Herein, renewable alginate hybridized with graphene oxide composites were used to investigate adsorption properties of methylene blue (MB) and neutral red (NR) in both single and binary systems. In the monocontaminant system of MB or NR, the adsorption isotherm followed the Langmuir model. Both pseudo-first-order and pseudo-second-order models could well describe the adsorption kinetics of MB and NR. With regards to the adsorption process for both dyes, a diffusion process with two stages was observed. However, in the coadsorption system, competitive adsorption of MB and NR occurred. The adsorption isotherm could be also well described by the Langmuir model, while adsorption kinetics was better fitted by the pseudo-second-order model. Compared to the single system, a one-stage diffusion process occurred in binary systems for both adsorption processes of MB and NR.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Limin Huang,Qiang Jin,Puja Tandon,Aimin Li,Aidang Shan,Jiajie Du
Investigating competitive adsorption on river/lake sediments is valuable for understanding the fate and transport of heavy metals. Most studies have studied the adsorption isotherms of competitive heavy metals, which mainly comparing the adsorption information on the same concentration. However, intrinsically, the concentration of each heavy metal on competitive adsorption sites is different, while the adsorption energy is identical. Thus, this paper introduced the site energy distribution theory to increase insight into the competitive adsorption of heavy metals (Cu, Cd and Zn). The site energy distributions of each metal with and without other coexisting heavy metals were obtained. It illustrated that site energy distributions provide much more information than adsorption isotherms through screening of the full energy range. The results showed the superior heavy metal in each site energy area and the influence of competitive metals on the site energy distribution of target heavy metal. Site energy distributions can further help in determining the competitive sites and ratios of coexisting metals. In particular, in the high-energy area, which has great environmental significance, the ratios of heavy metals in the competitive adsorption sites obtained for various competitive systems were as follows: slightly more than 3:1 (Cu-Cd), slightly less than 3:1 (Cu-Zn), slightly more than 1:1 (Cd-Zn), and nearly 7:2:2 (Cu-Cd-Zn). The results from this study are helpful to deeply understand competitive adsorption of heavy metals (Cu, Cd, Zn) on sediment. Therefore, this study was effective in presenting a general pattern for future reference in competitive adsorption studies on sediments.
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
危险品化学品经营许可证（带存储）