MOLECULES
·
2024
·Vol. 29
·期 22
·5251
·
IF 4.2
Yangyang Xie,Honglei Fan,Mingyang Che,Ya Liu,Chunjing Liu,Xin Hu,Botao Teng
Adsorbing and recycling alcohols and acids from industrial wastewater is of great significance in wastewater treatment; establishing the possible quantitative relationship of alcohol–acid adsorption capacity with the struct0ures of adsorbents and exploring the key factors determining their adsorption performance is very important and challenging in environment science. To solve this difficult problem, the adsorption of C1-5 alcohols, C2-4 acids, and Fischer–Tropsch synthesis (FTS) wastewater on zeolites with similar hydrophobicity and pore structures (β and MFI), similar hydrophilicity but different pore structures (Y and MOR), and similar pore structures but significant differences in hydrophobicity (MOR vs. β and MFI) was systematically investigated. It was found that: (1) For materials with similar pore structures, increased hydrophobicity correlates with enhanced adsorption capacities for alcohols and acids. (2) For materials with similar hydrophobicity, a higher content of ultramicropores leads to increased adsorption of alcohols and acids. (3) Between pore structure and hydrophobicity, it is hydrophobicity that ultimately plays a decisive role in adsorption capacities. The adsorption behavior of zeolites in FTS wastewater exhibits a consistent trend, with β-zeolite demonstrating the highest hydrophobicity (contact angle of 105°) and the greatest adsorption capacity in FTS wastewater, achieving 103 mg/g. Following five adsorption–desorption cycles, the zeolites retained their adsorption capacity without significant degradation, indicating their excellent stability and reusability. The findings identify the critical factors determining adsorption performance and provide a solid foundation for the design and development of high-performance adsorbents for alcohol–acid 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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Chuan Yu,Hongxu Liu,Jiafei Lyu,Zixing Xiao,Peng Bai,Xianghai Guo
A series of alkoxy groups are introduced to the UiO-66 structure to enhance its adsorption performance toward acetic acid in water. The adsorption kinetics, isotherm, thermodynamics, and regeneration of these adsorbents have been investigated, and the excellent adsorption capacity of n-propyloxy-substituted adsorbent (UiO-66-3) is illustrated. The adsorption of acetic acid on UiO-66-3 was a complex multistep process, and the close contact between O of the ether bond of the adsorbent and H of the carboxyl group of acetic acid played an important role in adsorption. The kinetic results could be fitted well to the pseudo-second-order model. The adsorption isotherm followed the Langmuir isotherm, which indicated that the adsorption process involved a strong interaction between adsorbate and adsorbent. The thermodynamic parameters (ΔG, ΔH, and ΔS) had also been calculated, which verified that acetic acid adsorption on UiO-66-3 was a spontaneously endothermic process. The adsorbent exhibited good stability under specified experimental conditions, which consolidated its potential as a solution to wastewater containing dilute acetic acid.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Tingting Zhang,Yi Li,Xudong Zhao,Weihua Li,Xiuyun Sun,Jiansheng Li,Rui Lu
During the boronic acid production process, boronic acid emission causes considerable loss of resources and water pollution. At present, adsorption is the preferred technology to treat boron pollution. Although conventional adsorbents are simple and effective, their regeneration and recovery are challenging, which hinder their wide-scale application. Considerable research efforts have been devoted to resolving the two issues mentioned above. Herein, a novel boron-adsorbing magnetic material with a cis -diol structure possessing boronate affinity was prepared. 3-Hydroxytyramine hydrochloride auto-polymerization (PDA), magnetic graphene oxide (GO) synthesis, polyethylenimine (PEI) self-assembly, and a 3,4-dihydroxyphenylpropionic acid (DHHA) covalent bonding procedure were conducted to synthesize a Fe 3 O 4 /PDA/GO/PEI/DHHA nanocomposite. This nanocomposite exhibited excellent adsorption performance and was easily recycled using an external magnetic force. The boronic acid was separated and recovered by simply adjusting the pH of the solution. The nanocomposite’s adsorption capacity reached 91.46 mg g - 1 at 30 °C with 4-formylphenylboronic acid (FPBA) as a model compound. Besides, the adsorption capacity of the nanocomposite was maintained at >89% of its original value even after five cycles. It was confirmed that the adsorption was primarily a thermochemical reaction controlled by entropy change. Thus, this novel adsorbent can be used for boron removal because it exhibits significant boronate affinity and high regeneration ability and is easy to recycle.
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
International Journal of Mining Science and Technology
·
2021
·
IF 4.084
Jinpeng Cai,Peilun Shen,Dianwen Liu,Xiaolin Zhang,Jianjun Fang,Chao Su,Xingcai Yu,Jiangli Li,Han Wang
In this work, the growth of copper sulfide crystal onto azurite surfaces during sulfurization and its response to flotation are investigated. Filed emission scanning electron microscopy-energy dispersive X-ray spectroscopy (FESEM) and X-ray diffraction (XRD) studies confirmed that the sulfurization of azurite is not limited to the mineral surface, but rather penetrates into the bulk to form covellite crystal (syn-CuS), creating favorable conditions for the stable adsorption of xanthate and greatly promoting the azurite flotation. Additionally, as demonstrated by X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (TOF-SIMS) analyses, a redox reaction occurred during this process, and Cu(Ⅱ) onto the mineral surface was reduced to Cu(I). Correspondingly, reduced S 2- was oxidized to (S 2 ) 2- , (S n ) 2- , and even to deeper oxidation state S 0 , (S x O y ) n- and SO 4 2- . Excess sodium sulfide strengthens copper sulfide to form onto the azurite surface, and provides enough raw material for crystal copper sulfide to grow, resulting in the formation of “flake-like” covellite with a better crystallinity. However, the floatability of azurite decreased dramatically under this condition, because the generated massive colloidal copper sulfide in flotation pulp deteriorates the flotation environment, resulting in a decreased effective adsorption of collector onto azurite surfaces.
研究领域:
矿物学
·
浮选化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Huiling Wu,Huangzhao Wei,Xu Yang,Chengyu Jin,Wenjing Sun,Kai Deng,Xin Rong,Gu Bin,Chenglin Sun
Separation of small-molecule carboxylic acids , especially acetic acid, from wastewater is challenging due to its high-water solubility, acidity, and low concentration. In this work, resin-derived spherical activated carbon (RSAC) was directly prepared from resin spheres through facile pre-oxidation and carbonization processes. RSAC was characterized by SEM, N 2 physisorption , XRD, Raman, element analysis and XPS. RSAC showed high removal rates (> 95.8 %) for a variety of small-molecule carboxylic acids. The initial adsorption capacity of acetic acid over RSAC was 23.4 mg/g and 94 % of the removal rate was retained after five successive adsorption-desorption cycles for 1000 mg/L acetic acid. In addition, RSAC showed a high total organic carbon removal rate (> 80 %) for the high-salinity effluent of catalytic wet air oxidation (CWAO) process. The adsorption of acetic acid over RSAC complied with the pseudo-second-order model and Langmuir model ideally, through Vander Waals force and pore-filling effect. Furtherly, discarded resin microspheres were used to prepare spherical active carbon, which showed 88.2 % removal of acetic acid (1000 mg/L). The benign scheme of “treating wastes by wastes” from economical and environmental aspects was realized.
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
Journal of Cleaner Production
·
2022
·
IF 11.072
Changwei Zhang,Zhihao Si,Lihe Zhang,Jieyi Wen,Changsheng Su,Huidong Chen,Jianbo Zhao,Di Cai,Xu Zhang,Peiyong Qin
The treatment of high chemical oxygen demand (COD) organic wastewater is one of the major technical bottlenecks for the industrialization of second-generation biobutanol production . An effective strategy to decrease the wastewater discharge in biobutanol fermentation process is broth recycling (BR). Nevertheless, the conventional BR process suffered from server organic-acid by-products inhibition, causing low butanol yield. In this study, to solve the barrier, active carbon (AC) adsorption system was hybrid with the acetone-butanol-ethanol (ABE) fermentation and ex - situ product separation (ESPR) units. After fermentation and pervaporation , organic acids that remaining in the ABE-separated broth were partially adsorbed onto AC so that improve the continuity and efficiency of the BR process. The physicochemical characterizations of different types of commercial ACs and the organic acids adsorption efficiency was evaluated by analyzing the static and dynamic adsorptions kinetics. When adopting the DD-type AC (code C299105), the better adsorbent for organic acids removal, 87.50% of fermentative wastewater can be saved whilst the ABE concentrations were also kept constantly at 15.22 ± 0.45 g L −1 in the following cycles of fermentation, and the ABE productivity was almost no changed (0.21 ± 0.01 g L −1 h −1 ) after 3 cycles of operation. Therefore, the AC assisted ESPR process is an attractive method for ABE production with low wastewater discharge.
研究领域:
生物工程
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环境科学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Juanjuan Cai,Leilei Jiang,Huaming Wei,Chongqing Wang,Liang Yu,Lixiong Zhang
In the present work, a carbon/cobalt composite was prepared and evaluated for adsorption of ecologically harmful tannic acid (TA). The composite was prepared by simply mixing phenolic resin with ZIF-67 and following by carbonization . TEM and SEM images showed that ZIF-67 was etched by phenolic resin and cobalt nanoparticles were formed and evenly distributed in carbon. Macroporous structure was generated between the carbonized phenolic resin and ZIF-67. N 2 adsorption-desorption isotherms results exhibited that the composite also had both micro- and meso-pores (average pore size of 5 nm) with a high surface area of 393 m 2 g −1 . Porous structure and evenly distributed cobalt nanoparticles facilitated the diffusion and adsorption of TA due to the formation of the complex between TA macromolecules and cobalt. The highest observed adsorption amount was as high as 2778 mg g −1 , significantly higher than that of the carbon prepared from carbonization of phenolic resin (205 mg g −1 ) and ZIF-67 (1375 mg g −1 ). The carbon composite material is easy to recover and reuse due to the magnetic property . The reuse experiment also showed high stability of the composite. All of the results indicated a great potential of the developed carbon composite material in wastewater treatment in the industry.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Fu Yang,Wenhao Li,Xiu Zhong,Wenlong Tu,Jie Cheng,Lei Chen,Jun Lu,Aihua Yuan,Jianming Pan
The adsorption separation of volatile organic compounds affords an efficient potential solution to address VOC emission. In this work, we reported alkaline sites-modified biomass-carbon adsorbents through in situ implanting MgO for reinforcing the adsorption abatement of polar VOCs. We revealed that the dispersed MgO alkaline sites in situ formed over the activated carbon during the KOH activation process by placing the magnesium acetate and KOH into grapefruit peel-based biochar together, which avoids the repeated postmodification. By tuning the mass proportion of Mg precursor and KOH activator, the optimized loading of magnesium oxide in AC was explored and compared with the MgO post-modified AC using a two-step procedure. The physicochemical properties of MgO-modified AC were characterized by various techniques. Impressively, MgO occupied a higher surface formation ratio (82.6%) in whole Mg species of the in-situ synthesized 10MgO/C compared to that (51.4%) in postimpregnated 10MgO/C-P. The adsorption properties of polar acetic acid and nonpolar benzene over the above comparative adsorbents were systematically studied by the gas-static adsorption method. The results revealed that the optimal sample of 10MgO/C afforded excellent structural properties (S BET = 2646 m 2 g −1 , V total = 1.59 cm 3 g −1 ) and a large adsorption capacity of polar acetic acid reaching 16.64 mmol g −1 at 30 °C. More importantly, compared to unmodified and nitrogen-doped AC, 10MgO/C showed improved acetic acid adsorption capacity, reversible desorption behavior, and lower adsorption heat. The calculation of Ideal Adsorption Solution Theory (IAST) for selective adsorption separation of the CH 3 COOH/C 6 H 6 binary mixture(50/50) over 10MgO/C showed the highest selectivity (3.42). This work offers new insight into the in-situ modification of AC and polar VOCs selective adsorption separation.
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
Journal of Environmental Sciences
·
2024
·
IF 5.9
Xiao Liu,Xiaolong Zhang,Chunyu Geng,Qinglan Hao,Jie Chang,Xin Hu,Yongwang Li,Botao Teng
Fischer-Tropsch synthesis (FTS) wastewater retaining low-carbon alcohols and acids are organic pollutants as a limiting factor for FTS industrialization. In this work, the structure-capacity relationships between alcohol-acid adsorption and surface species on graphene were reported, shedding light into their intricate interactions. The graphene oxide (GO) and reduced graphene oxide (rGO) were synthesized via improved Hummers method with flake graphite (G). The physicochemical properties of samples were characterized via SEM, XRD, XPS, FT-IR, and Raman. The alcohol-acid adsorption behaviors and adsorption quantities on G, GO, and rGO were measured via theoretical and experimental method. It was revealed that the presence of COOH, C=O and C O species on graphene occupy the adsorption sites and increase the interactions of water with graphene, which are unfavorable for alcohol-acid adsorption. The equilibrium adsorption quantities of alcohols and acids grow in pace with carbon number. The monolayer adsorption occurs on graphene was verified via model fitting. rGO has the highest FTS modeling wastewater adsorption quantity (110 mg/g) due to the reduction of oxygen species. These novel findings provide a foundation for the alcohol-acid wastewater treatment, as well as the design and development of high-performance carbon-based adsorbent materials.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhongming Wang,Xiaoqian Huang,Yong Jia,Lina Guo,Hong Wang,Wenxin Dai
Photocatalytic hydrogen production from formic acid (FA) is a daunting challenge, yet an essential task for the development of hydrogen energy. In this study, a p-NiO/n-TiO 2 heterojunction incorporating 7-nm metallic Ni was fabricated, which demonstrated a remarkable localized surface plasmon resonance (LSPR) effect. Notably, 5 wt% Ni/TiO 2 exhibited 1271-fold higher photocatalytic activity (2416 μmol⋅g −1 ⋅h −1 ) than TiO 2 alone under light radiation at room temperature. The experimental investigations revealed the excitation of distinct components via irradiation by different light sources. Visible light-driven hydrogen production was predominantly influenced by the LSPR-induced hot electrons and holes effects of Ni. Further, FA molecules simultaneously lost and accepted electrons at the Ni 0 –Ti 3+ and Ni 0 –O 2− sites, respectively, generating a bidirectional electron transfer behavior with “valley-shaped” gas-sensitive responses, which was crucial to boost the activity. Moreover, the photocatalytic activity was mainly attributed to the heterojunction and defects structure under UV light irradiation, and Ti 3+ , V O s, and O 2− as adsorption sites for FA. Thus, the synergistic interplay among different light sources could effectively boost the photocatalytic hydrogen production performance. Significantly, this research reveals that the LSPR effect of metallic Ni can effectively regulate electron transfer behavior and enhance visible light-driven photocatalytic activity.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Shiqi Weng,Ming Jin,Decheng Wan
A facile way to fabricate a pH-stable, durable, and porous material with active amines (NHx, x= 1,2)-derived diol groups on a pore surface is reported. Branched polyethyleneimine (PEI) in water forms a supramolecular complex with sodium dodecyl benzene sulfonate (SDBS), and this complex acts as an emulsifier . For the microcrystal cellulose (MC)-dispersed aqueous solution of PEI, SDBS is charged to turn the mixture into a medium internal phase air–in–water (A/W) emulsion upon oscillation. The emulsion is solidified by the partial crosslinking of PEI with polyethylene glycol diglycidyl ether (0.2 eq. of PEI NH groups) and further developed into an open-cellular monolith by removing the SDBS and water in the system. Under optimized conditions [pH 10, PEI at 20 % in water, and MC/PEI (50 % mass ratio)], the porous monolith (MC@PEI) shows a specific surface area of up to 14.9 m 2 g −1 . The amino groups are easily transformed into diols by treating with glycidol , and the resulting MC@PEI-diol can act as a scavenger to extract the trace boric acid in water. The adsorption follows the Langmuir model and shows chemical adsorption character with a boron-loading capacity of up to 2.68 mmol g −1 . Presaturing the scavenger with anionic dyes (488 mg g −1 ) exerts limited impact on the loading ability of BA. Additionally, the scavenger combines chemical stability in the absence of pH-labile bonds and mechanical durability for the composite structure with rigid MC skeleton and flexible PEI muscle.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 23
·期 1
·351-365
·
IF 2.828
Wang Changhui,Jiang He-Long,Xu Huacheng,Yin Hongbin
The use of phosphorus (P) inactivating agents to reduce internal P loading from sediment for lake restoration has attracted increasing attention. Reasonably, the physicochemical properties of P inactivating agents may vary with the interference of various environmental factors, leading to the change of control effectiveness and risks. In this study, the effect of fulvic acid (FA) adsorption on the properties of two agents, drinking water treatment residuals (DWTRs) and Phoslock®, was investigated. The results showed that after adsorption, there was little change for the main structures of DWTRs and Phoslock®, but the thermostability of Phoslock®, as well as the particle size and settleability of the two agents decreased. The specific surface area and pore volume of DWTRs also decreased, while those of Phoslock® increased. Further analysis indicated that aluminum and iron in DWTRs were stable during FA adsorption, but a substantial increase of lanthanum release from Phoslock® was observed, in particular at first ( P < 0.01). Moreover, the P immobilization capability of DWTRs had little change after FA adsorption, while the capability of Phoslock® after FA adsorption decreased in solutions ( P < 0.001) and sediments ( P < 0.1); interestingly, from the view of engineering application, the performance of Phoslock® was not substantially affected. Overall, each P inactivating agent had its own particular responses of the physicochemical properties to environment factors, and detailed investigations on the applicability of each agent were essential before practical application.
研究领域:
环境科学
·
湖泊修复
·
水处理技术
✓ 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）