Processes
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2022
·Vol. 10
·期 7
·1359
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IF 3.352
Xiaoyu Huo,Chao Jia,Shanshan Shi,Tao Teng,Shaojie Zhou,Mingda Hua,Xiangdong Zhu,Shicheng Zhang,Qunjie Xu
Potassium thiocyanate (KSCN), a highly efficient “three birds with one stone” activator, might work with inorganic activators to produce excellent N/S co-doped porous carbon (NSC) materials for environmental remediation. However, the effects of inorganic activators on cooperative activation are unclear. As a result, the influence of inorganic activators on the synthesis of NSC materials was investigated further. This study shows that the surface areas of the NSC materials acquired through cooperative activation by potassium salts (KOH or K2CO3) were considerably higher than those acquired through KSCN activation alone (1403 m2/g). Furthermore, KSCN could cooperate with K2CO3to prepare samples with excellent specific surface area (2900 m2/g) or N/S content. The as-prepared NSC materials demonstrated higher adsorption capability for chloramphenicol (833 mg/g) and Pb2+(303 mg/g) (pore fitting, complexation). The research provides critical insights into the one-step synthesis of NSC materials with a vast application potential.Keywords:N/S co-doping;porous carbon;chloramphenicol adsorption;Pb2+removal
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
·
IF 2.829
Zhe Wang,Keyan Tan,Jingyi Cai,Shitian Hou,Yue Wang,Peng Jiang,Minghui Liang
The removal of trace heavy metals from water is of great importance for human’s health, and it is highly desirable to develop efficient adsorption material to reach this target. SiO 2 encapsulated natural zeolite (SiEZ) was prepared as the adsorption material, which was characterized with TEM , SEM, XRD and BET. The adsorption capacitance of Pb 2+ , Cd 2+ , Cu 2+ , Zn 2+ , and Mn 2+ over SiEZ are 186, 10.3, 12.3, 9.0, and 4.2 mg g −1 , respectively. The highest removal percentages of Pb 2+ , Cd 2+ , Cu 2+ , Zn 2+ , and Mn 2+ over SiEZ can reach 99%, 98%, 98%, 98%, and 97%, respectively, at the initial heavy metals’ concentrations of 10 ppm. SiEZ is highly selective for the removal of Pb 2+ when five metals co-exist. SiEZ can be recycled for heavy metal removal ; at the first cycle, the removal percentage of Pb 2+ can reach 99%; after SiEZ is repeatedly used for four times, the removal percentage of Pb 2+ can still remain 83.8%. More importantly, elemental distribution measurement technology reveals that Pb 2+ and Zn 2+ in SiEZ can move from SiO 2 to NZ, which is helpful to understand the heavy metal transport in the composite.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
·
IF 2.829
Zhan-fang Cao,Xin Wen,Jing Wang,Fan Yang,Hong Zhong,Shuai Wang,Zai-kun Wu
In this work, a kind of magnetic graphene oxide composite material (TI/GO@Fe 3 O 4 ) for Pb 2+ removal was successfully synthesized through in situ growth method. Briefly, metal ions (Fe 3+ ) were fixed on GO surface by oxygen-containing functional groups and acted as growth centers of Fe 3 O 4 . Furthermore, the surface of GO and Fe 3 O 4 nanoparticles were strengthened by the triisopropanolamine and its oxidation products (TI), which can promote the removal of Pb 2+ ions. The mass percentage of Fe 3 O 4 particles in TI/GO@Fe 3 O 4 was 54.31% by EDS datas. Average particle size of TI/GO@Fe 3 O 4 is 19.03 nm. The adsorption experiments indicated that the adsorption capacity of TI/GO@Fe 3 O 4 can reach 461.00 mg/g under optimized conditions (10 mg TI/GO@Fe 3 O 4 , 50 mL 500 mg/L Pb 2+ , pH 5.0, 293 K, 120 min). The XPS analysis results indicated that the TI/GO@Fe 3 O 4 can adsorb the Pb 2+ through the complexation between nitrogen and oxygen-containing functional groups and Pb 2+ ions. Hence, the composite material is a superior material for the adsorption of Pb 2+ . Moreover, the synthesized adsorbent can be recycled by magnet quickly after adsorption.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Lumin Chen,Houyong Yu,Christopher Deutschman,Ting Yang,Kam Chiu Tam
We report a facile method to prepare a novel composite based on Fe-Cu alloy decorated cellulose nanocrystals (Fe-Cu@CNC) via simple oxidation-reduction reaction. Spherical zero-valent iron nanoparticles (NZVI) and sheet-like copper nanoparticles were serially anchored on the CNC surface, and the generated composite exhibited excellent antibacterial activities and highly efficient Pb 2+ removal. The composites had high antibacterial ratios of 95.9 %–99.9 %, because superoxide radicals can cause irreversible damage to the bacteria, eventually leading to apoptosis and bacterial death. Meanwhile, the Fe-Cu@CNC composite showed quick Pb 2+ ion removal, reaching a 70.76 % removal within 5 min, a total removal of 93.98 % after 1 h, and excellent reusability (retaining removal efficiency of 80.41 % after six cycles). The adsorption kinetics demonstrated that the adsorption behavior can be described by pseudo-second-order kinetic model (R 2 >0.99). This study offers a new strategy to prepare a promising composite with advanced antibacterial and heavy metal removal properties for wastewater treatment.
研究领域:
材料科学
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环境科学
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生物学
✓ 已验证
DOI
高影响因子
Applied Water Science
·
2021
·Vol. 11
·期 9
·1-8
·
IF 3.874
Song Fuxiang,Wang Na,Hu Zezhou,Zhang Zhen,Mai Xiaoxue,Jie Weibo,Bin Liu
Oral medical wastewater with heavy metal ions (such as plumbum, Pb 2+ ) is regarded as the main pollutant produced in the oral cavity diagnosis, and the treatment process can pose a serious threat to human health. The removal of Pb 2+ from oral medical wastewater facing major difficulties and challenges. Therefore, it is of great significance to take effective measures to remove Pb 2+ by using effective methods. A new activated three-dimensional framework carbon (3D AFC), regarded as the main material to remove Pb 2+ in the oral medical wastewater, has been fabricated successfully. In this experiment, the effects of 3D AFC absorbing Pb 2+ under different conditions (including solid-to-liquid ratio, pH, ionic strength, contact time, and initial concentration, etc.) were discussed. And the result revealed that the adsorption kinetics process of Pb 2+ on 3D AFC conformed to the pseudo-second-order model and the adsorption isotherm conformed to the Freundlich model. Under the condition that pH = 5.5 and T = 298 k, the calculated maximum adsorption capacity of 3D AFC for Pb 2+ was 270.88 mg/g. In practical application, it has strong adsorption ability for Pb 2+ in oral medical wastewater. Thus, 3D AFC shows promise for Pb 2+ remove and recovery applications because of high adsorption capacity for Pb 2+ in oral medical wastewater due to its high specific surface area, outstanding three-dimensional network structure.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Qiushi Jiang,Chaoyue Zhao,Zhaolian Han,Guixia Yang,Nan Qu,Lianzhi Sun,Weiping Li,Mingyu Wang,Zhiqiang Cheng
The synthesis of three amino-functionalized polyacrylonitrile/bentonite (PAN/BT) composite membranes and the removal strategies of Pb 2+ and Congo Red (CR) from water were put forward. The successful synthesis of PAN/BT was confirmed by scanning electron microscopy, X-ray energy spectrum, differential thermogravimetric analysis, specific surface area and contact angle tests. In addition, although having a similar composition to PAN/BT, the functionalized membrane materials have more N-H and C = N groups and stronger wettability. The influences of the optimal contaminant type, adsorbent dosage, temperature, contaminant concentration and contact time on the adsorption process of the modified membrane materials were systematically investigated. The adsorption processes were in good agreement with the Langmuir model, in which the theoretical maximum adsorption capacities of γ-aminopropyl triethoxysilane (KH550)-modified PAN/BT (K-PAN/BT), diethylenetriamine (DETA)-modified PAN/BT (D-PAN/BT) and hydroxylamine hydrochloride (NH 3 OHCl)-modified PAN/BT (N-PAN/BT) for Pb 2+ were 200.1, 332.9 and 182.8 mg/g, and the theoretical maximum adsorption of CR was 346.9, 156.2 and 579.2 mg/g, respectively, which were higher than 88 and 149 mg/g of bentonite, exhibiting excellent component synergy. The adsorption equilibrium was reached within 100 min for both Pb 2+ and CR, and the adsorption processes were in accordance with the pseudo-second-order kinetics, involving chelation, cation exchange and ‘π-π’ interactions. It is worth mentioning that the N-PAN/BT membranes can remove high concentrations of anionic and cationic dyes with a difference of up to 100 times, with selective adsorption potential and excellent contaminant indicating ability, which has an application prospect in the field of environmental protection.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 31
·20062-20073
·
IF 4.036
Lingkai Zhu,Yuyuan Yao,Dingzhou Chen,Ping Lan
Herein, we developed a low-cost fabrication route to prepare chemically grafted activated carbon fibers, which effectively removed Pb2+ from solution. Multiple characteristic results indicated that L-cyst-ACF had abundant nitrogen-containing and sulfur-containing functional groups. Based on the XPS and EDS analyses, the capture of Pb2+ was attributed to the abundant adsorption sites on the fiber surface. According to the analysis of the pseudo-second-order kinetic model and the Langmuir isotherm model, the adsorption process could be interpreted as monolayer adsorption and chemisorption, and the equilibrium adsorption capacity was determined to be 136.80 mg g−1 by fitting the pseudo-second-order kinetic model. The maximum adsorption capacity of L-cyst-ACF for Pb2+ was calculated to be 179.53 mg g−1 using the Langmuir model. In addition, the adsorption reaction was endothermic and spontaneous, as evidenced by the thermodynamic parameters. The outcomes of this study provide a low-cost and feasible strategy for the remediation of Pb2+ pollution in the environment.
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 SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Heng Zhao,Junhua Sun,Yanjie Du,Miaomiao Zhang,Zhen Yang,Jianhui Su,Xiujing Peng,Xiaolei Liu,Guoxin Sun,Yu Cui
Lead is a toxic heavy metal that is highly harmful to humans. Developing fast, efficient, and separable materials to treat lead-contaminated wastewater is challenging. In this paper, Cu-based MOF composite (SCC-CuMOF) was prepared by in-situ growth method and used for the removal of Pb 2+ from aqueous solutions. The obtained materials were characterized by field emission scanning electron microscope (FESEM), energy dispersive spectroscopy (EDS) mapping, Brunauer-Emmett-Teller (BET) specific surface area, X-ray diffraction (XRD) and infrared spectroscopy (IR). The effects of pH, coexisting ions, contact time, initial ion concentration, and temperature on the removal of Pb 2+ were investigated. SCC-CuMOF exhibited excellent adsorption performance on Pb 2+ . Adsorption of Pb 2+ on SCC-CuMOF were in accordance with the pseudo-second-order model and Langmuir model. The adsorption thermodynamic study suggested that the adsorption process was spontaneous and endothermic. The results revealed that Pb 2+ might be adsorbed onto SCC-CuMOF via ion exchange and coordination interaction. In general, SCC-CuMOF has the potential to remove Pb 2+ from wastewater rapidly and efficiently.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 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）