Urea-modified grass ash activated sludge carbon: structure and adsorption properties towards H<sub>2</sub>S and CH<sub>3</sub>SH

Li, Fen; Meng, Fanzhu; Wang, He; Ge, Baocai; Zhang, Yanping; Yu, Cailian

doi:10.1039/c9nj03836a

Cited by 8 publications

(4 citation statements)

References 11 publications

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“…However, more unusual is the excellent CO2 capacity for complex 1 despite its two-dimensional structure; many similar systems have previously been implicated in structural collapse following evacuation. 27 The poor gas uptake performance for compound 2 may be rationalised by a combination of the restricted pore size as well as, conceivably, a greater freedom of ligand flexibility bought about from the discrete cadmium-carboxylate cluster nodes, compared to the more inter-connected cadmium-carboxylate columns in complex 1. Both complexes were prepared in a substantially hydrated form, evidenced by resolved hydrogen-bonded solvent networks in both crystal structures.…”

Section: Discussionmentioning

confidence: 99%

Coordination chemistry of flexible benzene-1,3,5-tricarboxamide derived carboxylates; notable structural resilience and vaguely familiar packing motifs

et al. 2018

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Flexible benzene-1,3,5-tricarboxamides (BTAs), organic species well-known for their tendencies to form functional soft-materials by virtue of their complementary hydrogen bonding, are explored as structurally reinforcing supramolecular building blocks in porous coordination polymers. We report the synthesis and characterisation of two related, carboxylate-terminated BTA derivatives, and the structure and functionality of their polymeric Cd(ii) complexes. The polycarboxylate ligand benzene-1,3,5-tricarboxamide tris(phenylacetic acid) H3L1 was prepared, and the analogous trimethyl benzene-1,3,5-tricarboxamide tris acetate Me3L2 was prepared and its single crystal structure elucidated. On reaction with cadmium nitrate in a DMF/H2O mixture, each BTA compound yielded coordination polymer species with columnar packing motifs comparable to the familiar BTA triple helix seen in purely organic systems. In the case of Me3L2, this transformation was achieved through a convenient in situ ester hydrolysis. Complex 1 is a 2-dimensional layered material containing tubular intralayer pores, in which amide-amide hydrogen bonding is a notable structural feature. In contrast, the structure of 2 contains no amide-amide hydrogen bonding, and instead a columnar arrangement of ligand species is linked by trinuclear Cd(ii) cluster nodes into a densely packed three-dimensional framework. The crystal structures revealed both materials exhibited significant solvent-accessible volume, and this was probed with thermal analysis and CO2 and N2 adsorption experiments; complex 2 showed negligible gas uptake, while compound 1 possesses an unusually high CO2 capacity for a two-dimensional material with intralayer porosity and surprising structural resilience to guest exchange, evacuation and exposure to air.

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Section: Discussionmentioning

confidence: 99%

Coordination chemistry of flexible benzene-1,3,5-tricarboxamide derived carboxylates; notable structural resilience and vaguely familiar packing motifs

et al. 2018

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“…7 In recent years, exploring raw materials with wide sources and low cost to prepare efficient adsorbents has attracted much attention. A variety of carbon-based adsorbents have been synthesized, utilizing resources such as biomass waste, 8 sludge, 9,10 or a combination of multiple wastes. 11,12 Oil sludge is a primary solid waste derived from the oil industry.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, exploring raw materials with wide sources and low cost to prepare efficient adsorbents has attracted much attention. A variety of carbon-based adsorbents have been synthesized, utilizing resources such as biomass waste, sludge, , or a combination of multiple wastes. , Oil sludge is a primary solid waste derived from the oil industry . As environmental protection requirements continue to increase, the harmless and resourceful treatment of oil sludge has become an inevitable trend. , The pyrolysis process can not only dispose sludge but also recover oil, gas, and solid residue, which has good economic and environmental benefits.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Oil-Sludge-Based Adsorbents for the Treatment of Toxic H₂S in Oilfield Gases: Preparation, Modification, Characterization, and Adsorption Mechanism

Wang,

Li,

Wang

et al. 2023

Energy Fuels

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The mitigation of toxic hydrogen sulfide (H2S) in oil field gas is crucial as a result of its significant health and environmental repercussions. This research developed an efficient H2S adsorbent using oil sludge, a hazardous waste of oil production, by adding the alkaline activator KOH before pyrolysis. The performance of the adsorbent was assessed with a fixed bed in humid gas conditions. The adsorption kinetics were characterized theoretically, and reaction pathways were subsequently proposed. Results showed that the adsorbent activated by KOH presented a higher desulfurization capacity than those activated by NaOH, Na2CO3, and K2CO3. The addition of KOH increased the volume of the mesopores and the content of surface active sites. However, an optimal KOH concentration emerged when assessing the desulfurization capacity concerning the mass of the adsorbent or activator. The kinetic investigations revealed that the H2S adsorption process obeyed the Langmuir model and was modulated by both external diffusion and internal diffusion. In addition, the role of KOH during the H2S adsorption process was identified through the analysis of desulfurization products on the deactivated adsorbent. As a result of being catalyzed by KOH, elemental sulfur was oxidized to high-valent sulfuric acid and neutralized to sulfate. This research provides innovative perspectives on devising economical oil-sludge-based adsorbents, facilitating the concurrent processing of oil field gas and oil sludge in oilfield operations.

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“…Generally, excess sludge (ES) was applied for biochar preparation ( Li et al, 2019b ; Hu et al, 2019 ). ES is mainly generated by wastewater treatment plant (WWTP) with large yield ( Ghosh, 2009 ; Ali et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Dual Effect of Acetic Acid Efficiently Enhances Sludge-Based Biochar to Recover Uranium From Aqueous Solution

et al. 2022

Front. Chem.

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Excess sludge (ES) treatment and that related to the uranium recovery from uranium-containing wastewater (UCW) are two hot topics in the field of environmental engineering. Sludge-based biochar (SBB) prepared from ES was used to recover uranium from UCW. Excellent effects were achieved when SBB was modified by acetic acid. Compared with SBB, acetic acid-modified SBB (ASBB) has shown three characteristics deserving interest: 1) high sorption efficiency, in which the sorption ratio of U(VI) was increased by as high as 35.0%; 2) fast sorption rate, as the equilibrium could be achieved within 5.0 min; 3) satisfied sorption/desorption behavior; as a matter of fact, the sorption rate of U(VI) could still be maintained at 93.0% during the test cycles. In addition, based on the test conditions and various characterization results, it emerged as a dual effect of acetic acid on the surface of SBB, i.e., to increase the porosity and add (−COOH) groups. It was revealed that U(VI) and −COO− combined in the surface aperture of ASBB via single-dentate coordination. Altogether, a new utilization mode for SBB is here proposed, as a means of efficient uranium sorption from UCW.

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Urea-modified grass ash activated sludge carbon: structure and adsorption properties towards H₂S and CH₃SH

Abstract: The deodorization structure of H2S and CH3SH adsorbed by sludge carbon was studied, and the deodorized product was analyzed.

Cited by 8 publications

References 11 publications

Coordination chemistry of flexible benzene-1,3,5-tricarboxamide derived carboxylates; notable structural resilience and vaguely familiar packing motifs

Coordination chemistry of flexible benzene-1,3,5-tricarboxamide derived carboxylates; notable structural resilience and vaguely familiar packing motifs

Optimization of Oil-Sludge-Based Adsorbents for the Treatment of Toxic H₂S in Oilfield Gases: Preparation, Modification, Characterization, and Adsorption Mechanism

Dual Effect of Acetic Acid Efficiently Enhances Sludge-Based Biochar to Recover Uranium From Aqueous Solution

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Urea-modified grass ash activated sludge carbon: structure and adsorption properties towards H2S and CH3SH

Abstract: The deodorization structure of H2S and CH3SH adsorbed by sludge carbon was studied, and the deodorized product was analyzed.

Cited by 8 publications

References 11 publications

Coordination chemistry of flexible benzene-1,3,5-tricarboxamide derived carboxylates; notable structural resilience and vaguely familiar packing motifs

Coordination chemistry of flexible benzene-1,3,5-tricarboxamide derived carboxylates; notable structural resilience and vaguely familiar packing motifs

Optimization of Oil-Sludge-Based Adsorbents for the Treatment of Toxic H2S in Oilfield Gases: Preparation, Modification, Characterization, and Adsorption Mechanism

Dual Effect of Acetic Acid Efficiently Enhances Sludge-Based Biochar to Recover Uranium From Aqueous Solution

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Urea-modified grass ash activated sludge carbon: structure and adsorption properties towards H₂S and CH₃SH

Optimization of Oil-Sludge-Based Adsorbents for the Treatment of Toxic H₂S in Oilfield Gases: Preparation, Modification, Characterization, and Adsorption Mechanism