查找使用阿拉丁产品的科研文献

Development of attapulgite based catalytic membrane for activation of peroxymonosulfate: A singlet oxygen-dominated catalytic oxidation process for sulfamethoxazole degradation

Lei Zhou,Yubo Yan,Hengyang Mao,Shouyong Zhou,Jiayu Hui,Haodong Li,Meisheng Li,Yijiang Zhao,Qi Zhang,Shanshan Xia

Antibiotic contamination of aquatic ecosystems has attracted growing concern over the past few years. As a novel and low-cost catalytic membrane, attapulgite-based ceramic membrane (ATPCM) impregnated with Co 3 O 4 (Co-ATPCM) was successfully prepared for the degradation of sulfamethoxazole (SMX) under peroxymonosulfate (PMS) activation. The physical and chemical properties of ATPCM and Co-ATPCM were characterized by SEM-EDS, XRD, XPS, zeta potential, contact angle and the three-point bending test. Co was stably anchored on ATPCM via X-O-Co (X denotes Al, Si or Mg) bonds during the catalytic process, avoiding Co leaching. Approximately 70 % SMX could be removed by the optimized Co-ATPCM in batch experiments over a wide pH range from 4.0 to 10.0. Furthermore, 58 % SMX degradation was observed during filtration experiments with a high water flux of up to 774 L m −2 h −1 (LMH). According to the quenching experiment and electron paramagnetic resonance (EPR) spectroscopy, SO 4 − , OH and 1 O 2 were involved in the SMX degradation process, while 1 O 2 played a dominant role. Density functional theory (DFT) calculation successfully predicted that the sits on SMX molecules with high Fukui index were more susceptible to attacks by free radicals, confirmed by liquid chromatography-Quadrupole-time of flight mass spectrometer (LC-MS). Consequently, a possible pathway for the catalytic oxidation process was proposed based on the results of DFT and LC-MS. This study provided a promising strategy using natural magnesium aluminum silicate clay minerals to prepare cost-effective, efficient, and eco-friendly catalytic membranes for wastewater treatment.

A novel ceramic microfiltration membrane fabricated by anthurium andraeanum-like attapulgite nanofibers for high-efficiency oil-in-water emulsions separation

Zhaoru Fan,Shouyong Zhou,Hengyang Mao,Meisheng Li,Ailian Xue,Yijiang Zhao,Weihong Xing

Anthurium andraeanum-like Fe 3 O 4 -attapulgite (FATP) fibers were prepared by anchoring nano-Fe 3 O 4 particles on the surface of attapugite (ATP) via chemical coprecipitation . Then a novel ceramic microfiltration membrane with superhydrophilic and underwater superoleophobic performance was fabricated based on the FATP fibers. Ascribed to the hydrophilic performance of Fe 3 O 4 and micro-nano structure of FATP fibers, the underwater oil contact angles of the FATP membrance for various types of oils are larger than 158° and the membrane also possesses rather low adhesion force with oil droplets. After 3 cycles of oil-in-water (O/W) emulsion separation, the steady flux of FATP membrane is 209 L m −2  h −1 , 44% higher than that of ATP membrane. Moreover, the FATP membrane is stable and easy to clean, its oil rejection maintains at 98.7% and flux can recover by 86.5% using hot water as cleaning agent. The as-developed anthurium andraeanum-like structure in membrane surface provides promising guidance to improve the O/W purification performance of membrane.

Highly efficient sorption and immobilization of gaseous arsenic from flue gas on MnO2/attapulgite composite with low secondary leaching risks

Kai-Qiang He,Chun-Gang Yuan,Yang-Hong Jiang,Yan Li,Xue-Lei Duan,Qi Guo

Some sorbents have been developed for arsenic (As) compounds capture from flue gas . However, most of the conventional sorbents have cost constraints and can cause secondary pollution due to the leaching of arsenic after use. To solve this problem, a new and highly efficient adsorbent for gaseous arsenic was successfully developed in this paper with excellent immobilization performance and low-cost. A series of Mn-supported attapulgite (ATP) composites were fabricated, characterized, and investigated for arsenic capture. The modification of ATP with Mn not only considerably enhanced the adsorption efficiency but also stabilized the adsorbed As in the spent sorbents. SO 2 in flue gas promoted the adsorption performance through As-sulfate binding, whereas NO was beneficial for the oxidation of As(III) to As(V) on the surface of Mn-modified ATP. The incorporation of Mn with ATP generated abundant hydroxylate (OH − ) from hydration and accelerated the formation of As-sulfate compounds, which was beneficial for physical encapsulation. The results of the toxicity characteristic leaching procedure and sequential extraction test revealed that adsorbed As could be considerably immobilized by the sorbent with low leaching ability. Mn modification changed more As into inert fractions and consequently inhibited release from spent sorbents, which considerably reduced the risks of secondary pollution. The developed composite can be potentially used as a new efficient sorbent for gaseous arsenic capture in flue gas.

The preparation of cerium nitrate and attapulgite based superhydrophobic epoxy coatings for the corrosion protection of Q355 mild steel surface

Adeel Moid Butt,Yunpeng Wang,Haitao Ma,Hongjie Li

The current research focus is to design a robust micro/nano-structured superhydrophobic epoxy coating to improve the wetting and anti-corrosion behavior of Q355 mild steel in harsh environment and obtain desired properties of self-healing and self-cleaning. Modified attapulgite (APT) and cerium nitrate based high-performance corrosion inhibitor ODA/PDA/APT-Ce 3+ (OPA Ce 3+ ) coatings were synthesized by the addition of dopamine (DA) and octadecylamine (ODA) which resulted in excellent corrosion inhibition by enhancing the corrosion protection performance of metal alloy and improving the water contact angle of the synthesized epoxy based OPA Ce 3+ coating to more than 160°. While wettability and corrosion protection were strongly associated with cerium nitrate and DA content, the surface microstructure of coated steel samples were relevant to attapulgite quantity. Moreover, the OPA Ce 3+ surface coating demonstrated good self-healing properties to counter chemical deterioration in harsh environment after being exposed for several hours to 3.5 wt% sodium chloride, acidic and alkaline solution. It was able to regain its superhydrophobic properties following hot air flow over the coating surface. The OPA Ce 3+ epoxy coatings displayed long-lasting and outstanding self-healing performance in terms of its wettability and electrochemical stability.

A composite mesoporous ceramsite derived from activated carbon and attapulgite clay for efficient removal of methylene blue from aqueous solution

Liu Yani,Xu Lei,Feng Runtian,Zou Tong,Wang Yongcheng

The adsorptive removal of methylene blue (MB) from aqueous solution is often executed by attapulgite (ATP) due to its unique one-dimensional nanoscale structure and low-cost, abundant, eco-friendly advantages. Another commonly used material for this job is activated carbon. In this study, a novel composite porous ceramsite was prepared by combining activated carbon and ATP clay to remove MB from an aqueous solution. The composite porous ceramsite, calcined at 450 °C (CPC-450), was characterized by SEM, FT-IR, XRD, and BET specific surface area measurements. It possessed a high specific surface area of 313.606 m 2 /g and exhibited superior adsorption capacity toward MB than that of raw ATP. Consequently, a 99.6% MB removal efficiency was achieved at adsorption equilibrium. Moreover, the maximum adsorption capacity of CPC-450 increased compared to the raw ATP, with a value of 50.68 mg/g, and it could be reused more than 6 times. The adsorption experiment was executed at different conditions, and the Langmuir isotherm model and pseudo-second-order kinetic equation fitted the obtained data very well. The main driving forces for the adsorption process were found to be hydrogen-bonding interaction, electrostatic attraction, and chemical association.

Porous materials prepared from eco-friendly attapulgite and gallnut stabilized aqueous foam templates for high-efficient removal of organic pollutants

H. Yu,Y. Zhu,F. Duan,A. Wang

To date, whether it is the fabrication or adsorption process or the regeneration of adsorbent materials , cleanliness and environmental friendliness have been pursued by researchers. Herein, a novel and eco-friendly porous material was fabricated via the Pickering aqueous foam and applied to remove organic pollutants of brilliant green and chlortetracycline. The Pickering foam showed excellent stability and was synergistically stabilized by natural nanomaterials—attapulgite and botany—gallnut. The characterization result revealed that the attapulgite was modified by the organic molecular leached from the gallnut, and then adsorbed and formed a rigid shell at the water-air interface to prevent the coalescence and drainage of the bubble. The as-prepared porous adsorbent possessed excellent adsorption capacities of 939.83 and 465.85 mg/g for brilliant green and chlortetracycline and could be utilized cyclically at least 10 times by the carbonization regeneration at 400 °C under N 2 atmosphere. Overall, this work provided a sustainable and eco-friendly approach to fabricate porous material, and the material might have huge potential in practical applications as it has the excellent adsorption performance and the reusability .

One-step synthesis of magnetic attapulgite/carbon supported NiFe-LDHs by hydrothermal process of spent bleaching earth for pollutants removal

Jie Tang,Bin Mu,Li Zong,Aiqin Wang

Magnetic attapulgite/carbon supported NiFe layered double hydroxides (APT/C@NiFe-LDHs) were fabricated based on the spent bleaching earth via a facile and green hydrothermal approach. Multiple characterizations were conducted to illustrate that NiFe-LDHs was successfully anchored on the surface of APT during the preparation process. The magnetic response and adsorption properties of as-prepared composites could be facilely controlled by varying the Ni/Fe molar ratio . As expected, the coating of NiFe-LDHs significantly increased the adsorption ability to pollutants, the resultant composites prepared at the Ni/Fe molar ratio of 1:1 exhibited excellent adsorption capacities for methylene blue , Pb(II), and chlortetracycline hydrochloride of 271.28, 180.90, and 308.21 mg/g, respectively. The high adsorption capacity of the obtained adsorbents could be ascribed to the synergetic effect of the carbon species and NiFe-LDHs. In addition, the adsorbent could be easily separated by magnetic separation technology, and exhibited a stable recyclability after six adsorption-desorption cycles. This work provided a feasible pathway to design and fabricate adsorption materials for wastewater treatment taken into account both high-performance adsorption and cost-effective way.

Effervescence-assisted β-cyclodextrin/attapulgite composite for the in-syringe dispersive solid-phase extraction of pyrethroids in environmental water samples

Xiaoling Yang,Panjie Zhang,Xiaobing Li,Lu Hu,Haixiang Gao,Sanbing Zhang,Wenfeng Zhou,Runhua Lu

In this research, an effervescence-assisted β-cyclodextrin/attapulgite composite (β-CD/ATP) for the in-syringe dispersive solid-phase extraction (EAIS-DSPE) of pyrethroids in environmental samples was developed for the first time. A syringe was used to conduct the extraction procedure and a small amount of β-CD/ATP was dispersed into the solution with the release of carbon dioxide when the effervescent tablet components dissolved in water. Then, the sorbent was recovered using a filter membrane , and the analytes were directly eluted using acetonitrile . In the process, the β-CD/ATP sorbent resulted in an excellent extraction efficiency compared to commercially available sorbents such as C 18 and HLB. Moreover, in the extraction procedure, both the β-cyclodextrin inclusion interactions (especially the hydrophobic effects) and the special structure of the ATP contributed to the efficient enrichment of pyrethroids in aqueous media. The amount of β-CD/ATP sorbent, the volume of desorption, the ratio of NaH 2 PO 4 /Na 2 CO 3 , the volume of the sample, and the pH were screened using a Plackett–Burman design. All factors affecting the procedure were optimized by applying a central composite design. Under the optimized conditions, a good repeatability (RSDs) ranging from 1.7 to 2.3, linearity (2.5–500   μg   L −1 ), limits of detection (LODs) (0.15–1.03   μg   L −1 ), and an acceptable recoveries (76.8–86.5%) were achieved. Finally, the proposed method was successfully applied for the determination of pyrethroids in environmental samples including river water, reservoir water and lake water.

High-efficiency extraction of nucleosides based on the combination of self-assembly ionic liquid layer and boronic acid-functionalized attapulgite

Huihui Li,Ting Cheng,Shuxia Wang,Xinyue Zhu,Haixia Zhang

Boronate affinity materials have been widely used for selective capture of cis-diol-containing molecules, but most do not have sufficient extraction efficiency. We have prepared boronic acid-functionalized attapulgite, and then it was coated with imidazolium-based ionic liquid , 1-dodecyl-3-methylimidazolium bromide (C 12 mimBr), via physical self-assembly process. The extraction efficiency of the material increased dramatically after coated with C 12 mimBr, and its enrichment ratios for nucleosides increased by 9- to 282-fold. Besides, the C 12 mimBr-coated adsorbent did not lose selectivity and was able to capture cis-diols in the presence of a 100-fold excess of interferences. C 12 mimBr-coated material was applied to selective enrichment of nucleosides from human urine. The limits of detection and the limits of quantification were in the range of 0.06–0.46   ng   mL −1 and 0.20–1.53   ng   mL −1 , respectively. Reproducibility of the method was determined with relative standard deviations≤9.9%. The recoveries of the target nucleosides from spiked human urine were in the range of 87.8–109.6%. In our preception, self-assembly ionic liquid layer can serve as a promising alternative to improve the extraction efficiency of boronate affinity materials.

Study on preparation of a pizza-like attapulgite-based composite membrane and its performance on methylene blue and ciprofloxacin removal

Ting Zhang,Yang Liu,Jingjing Zhang,Jiaojiao Qiao,Xiaohui Yang,Tingting Li,Yi Wang

In this study, attapulgite (ATP) was made to unfolded in two-dimension on the surface of graphene oxide (GO) and metal oxides were loaded on it as active substances to prepare a multifunctional membrane material (Fe-Cu/ATP-GO) through an innovative pizza-like preparation method. The fabrication process of this composite membrane has undergone rigorous optimization to ensure optimal performance. In order to get insights into its structural and compositional features, the composite membrane was thoroughly investigated by XRD, FTIR, SEM, BET analysis, XPS, and TG, which showed ATP was uniformly dispersed on the surface of GO membrane and both Fe and Cu were successfully and uniformly loaded on the surface of ATP-GO membrane. The application of the Fe-Cu/ATP-GO membrane in treating wastewater contaminated with methylene blue (MB) or ciprofloxacin (CIP) showed over 90 % removal ratio of MB and over 70 % removal ratio of CIP after 10 min dynamic treatment experiments under optimal conditions, revealed its exceptional ability to effectively eliminate organic contaminants from water. Further mechanistic studies have shed light on the multifaceted treatment mechanisms employed by the composite membrane, including filtration, adsorption, and catalytic oxidation, etc. These mechanisms synergistically contribute to the membrane’s remarkable performance in removing refractory organics from water.

A novel hybrid hydrogel bead of sodium alginate/attapulgite/zeolitic imidazolate framework-8 for efficient adsorption of norfloxacin from water

Na Li,Shaobai Wen,Chunwei Yu

Sodium alginate (SA) hydrogels have been extensively utilized for pollutant removal from wastewater due to the distinct properties of hydrophilicity, biocompatibility and reusability. However, the limited functional groups and poor adsorption capacity have hindered their applications. In this study, a novel hybrid hydrogel bead, composed of sodium alginate, attapulgite, and zeolitic imidazole framework-8 (SA/ATP/ZIF-8), was synthesized using a one-pot blending and ion cross-linking method for adsorptive removal norfloxacin (NOR) from aqueous solutions. The incorporation of ATP and ZIF-8 significantly enhanced the thermal stability and anti-swelling properties of the SA hydrogel beads. The effects of solution pH, contact time, initial NOR concentration, temperature, and the presence of coexisting substances on NOR uptakes were systematically investigated. The results demonstrated that the NOR uptake on SA/ATP/ZIF-8 hybrid hydrogel beads was significantly higher than that of the pure SA and SA/ATP hydrogel beads, and the maximum theoretical adsorption capacity of SA/ATP/ZIF-8 for NOR was 1360.67 mg/g at pH 5.0. Furthermore, the adsorption kinetic was well-described by a pseudo-second-order model, while the adsorption isotherm was most accurately represented by the Langmuir-Freundlich model. In tests conducted with Nandu River water, the SA/ATP/ZIF-8 exhibited removal efficiencies of 100 % for NOR at an initial concentration of 0.0015 mmol/L and 71 % at 0.015 mmol/L. Spectroscopic characterization and adsorption performance experiments indicated that the adsorption of NOR onto SA/ATP/ZIF-8 involved multiple mechanisms, including hydrogen bonding, electrostatic adsorption, cation exchange, π-π electron donor-acceptor interaction (EDA), and coordination. Consequently, the remarkable features of SA/ATP/ZIF-8 hydrogel beads highlight their great potential and promising practicability for separation and removal of lower-concentration antibiotics from wastewater.

Flocculation synergistic with nano zero-valent iron augmented attapulgite @ chitosan as Fenton-like catalyst for the treatment of landfill leachate

Yongyao Xu,Wangqing Shen