IRANIAN POLYMER JOURNAL
·
2016
·Vol. 25
·期 3
·277-284
·
IF 1.684
Li He-ping,Li Hui,Liu Yi
The development of new environment-friendly and efficient adsorbents has attracted a great interest in recent years. In this study, ethylene diamine-grafted chitosan copolymer (CS–MAA–EN) and triethylene tetramine-grafted chitosan copolymer (CS–MAA–TN) were synthesized to remove heavy metal ions from water. The influence of pH, adsorbents dosage and initial metal concentration were investigated to study the adsorbing effect of CS–MAA–EN and CS–MAA–TN for the removal of Cu 2+ from aqueous solutions. The equilibrium adsorption capacities of CS–MAA–EN and CS–MAA–TN were 85.91 and 102.67 mg/g, respectively. The adsorption process was fitted better by the Langmuir isotherm model ( R
2 = 0.9993, 0.9991) than the Freundlich isotherm model ( R
2 = 0.8781, 0.8775). The adsorption kinetics confirmed that the adsorption mechanism could be better described by the pseudo-second-order equation. Two adsorbents showed excellent desorption efficiency ( D
e ) and reuse ratio ( R
u ). D
e and R
u of CS–MAA–EN were evaluated as 95.2 and 89.35 %, respectively, and those values of CS–MAA–TN were 92.73 and 83.25 %. The competitive adsorption results of the two adsorbents indicated that the rate sequence was Fe 3+ > Cu 2+ > Cr 6+ > Ni 2+ > Zn 2+ .
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 7
·4417-4427
·
IF 4.036
Baoquan Jia,Dingna Liu,Chengyu Niu,Qili Yu,Jie Ren,Qingye Liu,Haiqiang Wang
The development of adsorbents by using the byproducts or waste from large-scale industrial and agricultural production is of great significance, and is considered to be an economic and efficient strategy to remove the heavy metals from polluted water. In this work, a novel chitin/EM@Fe3O4 nanocomposite hydrogel was obtained from a NaOH/urea aqueous system, where the proteins of egg shell membrane and Fe3O4 nanoparticles were chemically bonded to chitin polymer chains with the help of epichlorohydrin. Due to the existence of a large number of –NH2, –OH, –CONH–, –COOH and hemiacetal groups, the adsorption efficiency for Pb2+ into the absorbent was dramatically enhanced. The experimental results revealed that the adsorption behavior strongly depends on various factors, such as initial pH, initial Pb2+ concentration, incubation temperature and contact time. The kinetic experiments indicated that the adsorption process for Pb2+ in water solution agreed with the pseudo-second-order kinetic equation. The film diffusion or chemical reaction is the rate limiting process in the initial adsorption stage, and the adsorption of Pb2+ into the nanocomposite hydrogel can well fit the Langmuir isotherm. Thermodynamic analysis demonstrated that such adsorption behaviors were dominated by an endothermic (ΔH° > 0) and spontaneous (ΔG° < 0) process.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2024
·Vol. 221
·期 12
·2300874
·
IF 1.9
Jie Yang,Zhengkun Cai,Dong Li
In this experiment, ZSM-5 molecular sieves are prepared by hydrothermal synthesis and modified by impregnation with Fe, La, and Ce loading. X-ray diffraction, X-ray photon-electron spectroscopy, and scanning electron microscopy show that Fe, La, and Ce elements are successfully loaded onto the surface of the material, and the surface area of Fe-La-Ce-ZSM-5 is 241.66 m 2 g −1 . A systematic study on the adsorption of Congo red solution is carried out using Fe-La-Ce-ZSM-5 molecular sieves and it is found through the adsorption data that the adsorption process is more in line with Langmuir and the proposed second-order kinetic model, and the theoretical saturated adsorption capacity is 2669.19 mg g −1 . The adsorption process is recycled four times and still has more than 60 % removal performance for high-concentration Congo red solution. The results of this experiment show that Fe-La-Ce-ZSM-5 molecular sieves show excellent removal performance for Congo red dye in wastewater.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Aoyun Shen,Xinrong Liao,Yongqiang Li
Cotton fiber was functionalized with polyamine polymer PEI by a facile and eco-friendly method. The structural and chemical characteristics of the resulting PEI@cotton were investigated using various analysis techniques and the adsorption performance of the PEI@cotton was tested by removing organic dye pollutant from aqueous solutions. The incorporation of polyamine groups on the cotton fiber surface enabled PEI@cotton to selectively remove negatively charged organic dye pollutants from aqueous solution, and significantly outperformed, in terms of rate and capacity, untreated cotton fiber. The isotherm study indicated that the absorption of MO and XO by PEI@cotton obeyed the Langmuir model, and the maximum adsorption values were 755.7 mg/g and 303.4 mg/g, respectively. Kinetic experiments confirmed that the pseudo-second-order model was more suitable for describing the adsorption data. The possible adsorption mechanism of PEI@cotton to negatively charged dye contaminants has been provided. Furthermore, PEI@cotton can be regenerated multiple times through a simple operation with no significant loss of performance. Overall results of adsorption indicated that the PEI@cotton was a promising material for rapid and efficient adsorption of negatively charged dyes from aqueous solution. It is hoped that the facile and scalable methodology described in this work can provide ideas for the production of environmentally friendly water treatment materials.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Xiaojun Jv,Xiaowei Zhao,Hucheng Ge,Jingyi Sun,Hai Li,Qiusheng Wang,Hongguang Lu
At present, synthetic dyes have been widely used in several industries such as textiles, rubber, paper, plastic, and leather tanning. The dyes in effluents are among the most aggressive pollutions of all the industrial sectors and can lead to severe water contamination as well as resource waste without proper treatment and recovery. In the present work, magnetic poly(aspartic acid)-poly(acrylic acid) hydrogels (PAsp-PAA/Fe3O4) with semi-interpenetrating networks are successfully prepared. Their physicochemical properties are systematically characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, the Brunauer–Emmett–Teller method, thermogravimetric analysis, and vibrating sample magnetometry. Organic dye methylene blue (MB) and neutral red (NR) adsorption onto the PAsp-PAA/Fe3O4 hydrogel are studied for the first time, and the maximum adsorption capacities of MB and NR are calculated by using the Langmuir model as 357.14 and 370.37 mg·g–1, respectively. The adsorption kinetics can be well described by a pseudo-second-order kinetic model. Furthermore, reusability tests indicate that the hydrogel has good reproducibility. In conclusion, the results demonstrate that the PAsp-PAA/Fe3O4 hydrogel can used as an excellent adsorbent material for removing dye pollutants from wastewater.
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
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2019
·
IF 4.978
Zhenjiang He,Yuxi Yang,Peng Bai,Xianghai Guo
Selective adsorption and separation of three xylene isomers of seven stable metal-organic frameworks (MOFs) were investigated, where MIL-53(Cr) manifested the highest adsorption capacity and apparent preference for o -xylene. Further detailed studies with MIL-53(Cr) showed that pseudo-second-order model fit best with adsorption kinetics of xylene isomers, and the isotherms were perfectly fitted by Langmuir isotherm model. The adsorption was proved to be a quick process, and both the changes of entropy and enthalpy contributed to the o -xylene selectivity, but which mainly resulted from the entropy effect. The adsorption capacity of preferable isomer o -xylene, on account of better packing efficiency, was record-breaking 8.19 mmol/g, and selectivity of OX/PX, OX/MX and MX/PX were 13.75, 8.01 and 1.72, respectively. Both the adsorption capacity and OX selectivity on MIL-53(Cr) in liquid phase adsorption and breakthrough experiments were super high, which discriminated it from zeolites and other materials reported so far. Combined with extremely short equilibrium time and high stability, MIL-53(Cr) can be a promising adsorbent for separation of xylenes in industrial process.
研究领域:
化学工程
·
材料科学
·
物理化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 23
·24062-24074
·
IF 2.914
Xu Sheng,Jiang Xinde,Liu Lingli,Wang Zhenxi,Zhang Xiaohang,Peng Yong,Cao Meng
Polyvinyl alcohol (PVA) filled with different kinds of ZnO whisker was prepared by chemical cross-linking reaction. It was found that the ZnO whiskers dispersed uniformly after being modified by 3-aminopropyltriethoxysilane (APTES). The PVA/tetrapod-shaped ZnO (PVA/tetra-ZnO) composites showed better adsorption performance than other kinds of PVA/ZnO composites. The framework-supported pore-channel structure was beneficial for the transmission and adsorption of heavy metal ions, and the formation of “brush” pore-channel of PVA/tetra-ZnO composites can effectively retain and capture the heavy metal ions. The PVA/tetra-ZnO composites presented well adsorption on Pb(II), Cd(II), and Cr(III) ions than Ni(II) and showed relatively selective removal on Pb(II) and Cr(III) ions. The adsorbed heavy metal ions presented gradient distribution with high content in the out layer and low content in the inner layer. Pb(II) adsorption capacity q e increased gradually with the increase of initial solution concentration and contact time which tended to be stable at 400 mg/L and 800 min. The maximal adsorption capacity q m obtained by nonlinear fitting reached to about 116 mg/g which was very close to the experiment data. Adsorption isotherm results indicated the monolayer adsorption process of the Langmuir model and the adsorption kinetics data fitted well to the pseudo-second-order model. The adsorption process was spontaneous and the high temperature was in favor of adsorption. The adsorption mechanism was explored as the combination of coordination and ion exchange. Besides, the PVA/tetra-ZnO composites exhibited better stress stability, thermo stability, and favorable regeneration than neat PVA.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Fang Chengqian,Liu Wanbing,Dai Yimin,Wang Zhiheng,Li Yaqi,Cai Ling,Liu Bo,Yang Siwen,Wang Junlong,Ding Xianglong,Zhang Yue-Fei,Li Yan,Wan Li
A novel magnetic hierarchically pillared Sep@Fe 3 O 4 /ZnAl-LDH composite was successfully synthesized via co-precipitation methods. The prepared Sep@Fe 3 O 4 /ZnAl-LDH composite were characterized via FTIR, XRD , XPS , SEM, TEM , BET and VSM . The results show that the Sep@Fe 3 O 4 /ZnAl-LDH composite have a hierarchical columnar structure with nanoscale structural unit (Fe 3 O 4 /ZnAl-LDH) and overall micron-scale morphology, and the obtained graded adsorbent has a large pore capacity and pore size distribution . The maximum adsorption capacities of the obtained samples for methyl orange ( MO) and Congo red ( CR) were 430 mg·g −1 and 832 mg·g −1 , respectively. Kinetic data of MO and CR adsorbed on as-prepared samples can well fit with pseudo-second-order model. The isothermal data of MO and CR adsorbed on Sep@Fe 3 O 4 /ZnAl-LDH match well with the Langmuir model. The thermodynamic results indicate that the adsorption process is spontaneous and endothermic. Besides, the adsorbent shows good stability and reproducibility in a reusable cycle. This study demonstrated that Sep@Fe 3 O 4 /ZnAl-LDH provides a new idea for the development of a novel hierarchical magnetic pillared adsorbent for the efficient removal of anionic dyes.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Xiaodi Li,Shan Ren,Lian Liu,Xiangdong Xing,Lin Chen,Jiangling Li,Jian Yang,Qingcai Liu
The serious deactivation of denitration catalysts caused by heavy metals still a thorny issue in the practical application of selective catalytic reduction of NO x with NH 3 . Herein, we proposed a novel anti-poisoning strategy by designing SO 4 2− /ZrO 2 superacid supported CeO 2 /ZrO 2 catalyst, and the effect of SO 4 2− /ZrO 2 supported CeO 2 /ZrO 2 for PbO-resistance NO x catalytic reduction was investigated. It was worthy to note that the introduction of solid superacid SO 4 2− /ZrO 2 significantly enhanced catalytic performance over the entire temperature range, with an exceptionally high NO x removal efficiency over 98 % during 250–500 °C. When 2 wt% PbO was deposited on the fresh catalyst, the catalytic activity of CeO 2 /ZrO 2 catalyst decreased obviously, while CeO 2 /ZrO 2 -S catalyst can still maintain a higher NO x conversion over 90 % from 275 to 500 °C. The characterization results confirmed that the introduction of solid superacid SO 4 2− /ZrO 2 enhanced the surface acidity and promoted the transformation from Ce 4+ to Ce 3+ . The results of in situ DRIFTS implied that the Eley-Rideal (E-R) mechanism was obeyed over CeO 2 /ZrO 2 catalyst, and both Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) mechanisms were followed over CeO 2 /ZrO 2 -S catalyst in the SCR process. With regard to poisoned catalysts, the NH 3 adsorption was inhibited to some extent, while the reaction mechanism wasn’t changed by PbO poisoning.
研究领域:
催化
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Zi-jian Shao,Xue-lian Huang,Fan Yang,Wei-feng Zhao,Xin-zhi Zhou,Chang-sheng Zhao
Sodium alginate (SA) beads with ultrahigh adsorption capacity were prepared via hydrogen bonds between SA and 2-acrylamido-2-methylpropa-1-propanesulfonic acid (AMPS), and the AMPS was then post-cross-linked to manufacture SA/PAMPS beads. The equilibrium adsorption capacities of methylene blue (MB) and Pb 2+ for the SA/PAMPS10 beads were 2977 and 2042 mg/g, respectively. Although the SA beads exhibited higher equilibrium adsorption capacities of MB and Pb 2+ than those of the SA/PAMPS10 beads, the SA/PAMPS10 beads had better mechanical property and higher stability. The pseudo-second-order kinetic model and the Langmuir isotherm described the adsorption processes of the SA/PAMPS10 beads for MB well. In addition, the SA/PAMPS10 beads could be reused with stable adsorption capacity for at least three cycles. The beads also had excellent performances on absorbing methylene violet and other heavy metal ions (Cu 2+ , Cd 2+ and Ni 2+ ). Therefore, the SA-based beads with high adsorption capacity might be good candidates for industrial pollutant treatments.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2024
·Vol. 31
·期 2
·673-684
·
IF 2.5
Zhao Dongliang,Zhou Peng,Li Xiangzhou,Song Ke
Mesoporous carbon has become a research hot spot due to its excellent properties and broad application prospects. In this study, mesoporous carbon was synthesized simply by carbonizing a composite of chitosan (CS) and nano-barium carbonate, taking advantage of the excellent flocculability of CS. The structure and morphology of chitosan-based mesoporous carbon (CSMC) were characterized using BET, SEM, FT-IR, XRD, XPS and Raman techniques. The results revealed that CSMC possessed a graphitic and diamond-like structure consisting of C (92.8%), O (6.9%) and N (0.3%). The mass ratio of BaCO 3 /CS played an important role in pore formation, with CSMC5 exhibiting a specific surface area and mesoporous surface area up to 2211 and 1119 m 2 /g, respectively. The adsorption performance of CSMC was tested with chlorogenic acid (CA) as the adsorption object. The saturated adsorption capacity of CSMC for CA was up to 742.52 mg/g and the adsorption rate was rapid. The adsorption behavior of CA by CSMC conformed to Langmuir isothermal adsorption model and pseudo-second-order kinetic model. Thermodynamic parameters indicated that the adsorption of CA by CSMC was exothermic and reversible. This study provides a promising approach for the synthesis of chitosan-based mesoporous carbon materials and potential applications in sustainable technologies.
研究领域:
材料科学
·
环境科学
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Junwen Li,He Li,Qiao-e Wang,Haiming Cheng
ABSTRACT A novel adsorbent ion-imprinted polymer–silica clay (IIP@SC) was prepared via surface ion imprinting technology by using silica clay (SC) as the support matrix and methacrylic acid as the ionic imprinting monomer. The adsorbent was characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The prepared IIP@SC was applied for recovery of Cr(III) ions from aqueous solution. The selectivity properties of IIP@SC are evaluated. The results showed that the maximum adsorption capacity reached 157.98 mg/g in 30 min when the initial concentration of metal ions was 100 mg/L at pH 6.0. Adsorption kinetic and adsorption equilibrium studies demonstrated that the experimental data fitted well with the pseudo-second-order model and the Langmuir isotherm model. Competitive adsorption study showed that the prepared IIP@SC exhibits an efficient selectivity for Cr(III) ions.The prepared IIP@SC adsorbent can be a promising adsorbents for Cr(III) recovery from aqueous solutions with high selectivity.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）