Selective adsorption of Pb2+ and Cu2+ on amino-modified attapulgite: Kinetic, thermal dynamic and DFT studies

Xu, Lei; Liu, Yani; Wang, Jingang; Tang, Ying; Zhang, Zhe

doi:10.1016/j.jhazmat.2020.124140

Cited by 151 publications

(57 citation statements)

References 57 publications

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“…The (200) and (040) diffraction reflection of ATT still existed, which suggested that the silicon–oxygen tetrahedral chains still remained . In the meantime, all profiles exhibited a strong reflection at 2θ = 26.18° ( d = 3.34 Å), which indicated the pristine ATT had some impurity of quartz . Notable reflection peaks were observed in series samples of P-ATT-MEL at 2θ = 17.76° (−110), 2θ = 26.27° (102), 2θ = 21.75° (012), 2θ = 28.87° (112), and 2θ = 22.15° (111), which indicated that the MEL (JCPDS no.…”

Section: Resultsmentioning

confidence: 96%

Highly Stable and Recyclable Sequestration of CO₂ Using Supported Melamine on Layered-Chain Clay Mineral

Peng

Sun

Jian

et al. 2021

ACS Appl. Mater. Interfaces

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A type of highly stable and recyclable clay-based composite was developed for sequestration of CO2, which was synthesized by loading melamine (MEL) onto attapulgite (ATT) via a wet impregnation method. The synthesized materials were characterized by N2 adsorption–desorption, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), and transmission electron microscopy (TEM). By means of thermal and acidic treatments more active sites of ATT were exposed, and large surface areas were obtained. The MEL molecules were well combined with those exposed sites, which enhanced stability and cyclability for CO2 sequestration. On the basis of CO2 adsorption–desorption measurements, the composite of ATT-MEL was found to have a higher CO2 adsorption capacity (4.91 cm3/g) which was much higher than that of CO2 absorption on bare MEL (1.30 cm3/g) at 30 °C. After ten cycles of reusing, the composite exhibited even higher capacity for CO2 adsorption by an increased percentage of 5.91% (30 °C) and 5.77% (70 °C) compared to the capacity in the first cycle. The reason lies in the strong interaction between melamine and attapulgite matrix which was further confirmed by DFT calculations. The MEL was validated to have advantages over aliphatic amines (TEPA) in modifying ATT to get high stability of CO2-adsorbents.

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Section: Resultsmentioning

confidence: 96%

Highly Stable and Recyclable Sequestration of CO₂ Using Supported Melamine on Layered-Chain Clay Mineral

Peng

Sun

Jian

et al. 2021

ACS Appl. Mater. Interfaces

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“…The wheat straw was cleaned successively with tap water and deionized water, then cut into small sections of about 2 cm, dried and pyrolyzed in a tube furnace under limited oxygen (under the protection of N 2 ) at 350 • C for 2 h. After naturally cooling to room temperature, the pristine biochar was obtained, grounded, sieved through 100 mesh sizes (0.150 mm) and named as BC. Based on the results of previous studies [29,30], BC was modified successively with KOH (2 mol/L), HNO 3 (1 mol/L) and ammonia solution (5%, w/w), then washed repeatedly with deionized water until neutral. After drying, the aminomodified biochar was obtained and named as HNC.…”

Section: Synthesis Of Bc and Hncmentioning

confidence: 99%

Simultaneous Removal of Cu2+, Cd2+ and Pb2+ by Modified Wheat Straw Biochar from Aqueous Solution: Preparation, Characterization and Adsorption Mechanism

Wang

Zheng

Jiao

et al. 2022

Toxics

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As an eco-friendly and efficient adsorbent for removal of potential toxic metals from aqueous solution, biochar has received widespread attention. In the present study, wheat straw biochar (BC) and corresponding modified biochar (HNC) were used to remove Cu2+, Cd2+ and Pb2+ from an aqueous solution. The influence of the environment factors on metals adsorption and adsorption mechanism were discussed in detail. The results showed that the HNC had porous structures and owned ample functional groups (−OH, −COOH and C−N groups) compared with the BC. In the single system, the adsorption capacities of HNC for Cu2+, Cd2+ and Pb2+ at a pH of 5.5 were 18.36, 22.83 and 49.38 mg/g, which were 76.89%, 164.36% and 22.75% higher than that of the BC, respectively. In addition, the adsorption process of Cu2+ and Cd2+ on BC and HNC fitted to the Langmuir isotherm model and pseudo-second-order kinetics, but the adsorption of Pb2+ on BC and HNC fitted to the Langmuir isotherm model and pseudo-first-order kinetics. Adsorption isotherms indicated that the adsorption of Cu2+, Cd2+ and Pb2+ by BC and HNC was a spontaneous endothermic process. The competitive adsorption of mixed metal ions (Cu2+, Cd2+ and Pb2+) revealed that HNC was more preferential to adsorb Cu2+ compared with Cd2+ and Pb2+. Furthermore, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses revealed that the main adsorption mechanisms were surface complexation and precipitation, and the adsorbed Cu2+, Cd2+ and Pb2+ on HNC mainly exist as CuO, Cd(OH)2, Pb3O4 and Pb(OH)2.

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“…So there is a reason why the leaching concentration of copper is increased when the amount of doping increases in the later period. In an environment where both Pb 2+ and Cu 2+ exist, the Cu 2+ absorption sites of attapulgite will be preempted by Pb (Xu et al 2021). A further explanation comes from the study of Du et al (Du et al 2016).…”

Section: The Leaching Concentration Of the Solidi Ed Bodymentioning

confidence: 99%

Study on Solidification of Chromium-Containing Sludge With Alkali Slag Combined With Attapulgite

Lin¹,

Zeng²,

Zhang³

et al. 2021

Preprint

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In order to solve the harm of hazardous waste chromium-containing sludge to humans and the environment, this paper uses attapulgite to strengthen alkali slag to prepare cementitious materials to solidify/stabilize chromium-containing sludge. Single-factor and orthogonal experiments were used to optimize the preparation parameters of alkali slag cementitious materials. The compressive strength, heavy metal leaching toxicity, and microscopic characterization of chromium-containing sludge solidified body were tested to investigate the solidification effect and mechanism of chromium-containing sludge. The results show that: The best content of attapulgite is 4%. The compressive strength of the solidified body decreased with the increase of chromium sludge content, and the leaching concentration of Cr and Cu increased with the rise of chromium-sludge content. The addition of attapulgite enhanced the compressive strength. Compared with the original chromium-containing sludge, the leaching concentration of heavy metals in the solidified body is significantly reduced. The XRD and FTIR analysis showed that the solidified body might solidify/stabilize heavy metals by physical encapsulation of amorphous form and chemical immobilization. This research realizes the use of waste to treat waste and provides the possibility for the application of solidified products in construction.

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Selective adsorption of Pb2+ and Cu2+ on amino-modified attapulgite: Kinetic, thermal dynamic and DFT studies

Cited by 151 publications

References 57 publications

Highly Stable and Recyclable Sequestration of CO₂ Using Supported Melamine on Layered-Chain Clay Mineral

Highly Stable and Recyclable Sequestration of CO₂ Using Supported Melamine on Layered-Chain Clay Mineral

Simultaneous Removal of Cu2+, Cd2+ and Pb2+ by Modified Wheat Straw Biochar from Aqueous Solution: Preparation, Characterization and Adsorption Mechanism

Study on Solidification of Chromium-Containing Sludge With Alkali Slag Combined With Attapulgite

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Selective adsorption of Pb2+ and Cu2+ on amino-modified attapulgite: Kinetic, thermal dynamic and DFT studies

Cited by 151 publications

References 57 publications

Highly Stable and Recyclable Sequestration of CO2 Using Supported Melamine on Layered-Chain Clay Mineral

Highly Stable and Recyclable Sequestration of CO2 Using Supported Melamine on Layered-Chain Clay Mineral

Simultaneous Removal of Cu2+, Cd2+ and Pb2+ by Modified Wheat Straw Biochar from Aqueous Solution: Preparation, Characterization and Adsorption Mechanism

Study on Solidification of Chromium-Containing Sludge With Alkali Slag Combined With Attapulgite

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Product

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Highly Stable and Recyclable Sequestration of CO₂ Using Supported Melamine on Layered-Chain Clay Mineral

Highly Stable and Recyclable Sequestration of CO₂ Using Supported Melamine on Layered-Chain Clay Mineral