|
1
|
Wang F, Hu X, Tang C, Liu C, Zhu Z. Phosphate-functionalized ramie stalk adsorbent for efficient removal of Zn 2+ from water: adsorption performance, mechanism, and fixed-bed column treatment of real wastewater. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:6245-6261. [PMID: 35989403 DOI: 10.1007/s11356-022-22590-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 08/13/2022] [Indexed: 06/15/2023]
Abstract
A highly efficient adsorbent functionalized with phosphate groups made from a local agricultural waste, ramie stalk, was designed for Zn2+ removal from water. SEM, EDS, FTIR, zeta potential, and XPS tests were used to study the morphology and properties of modified ramie stalk (RS-P). The results showed that the phosphate groups were successfully grafted to the surface of the ramie stalk, which has a multilayered and porous structure and can provide large adsorption sites. Adsorption performance and mechanism were investigated in the static and dynamic adsorption experiments. The adsorption kinetics of Zn2+ by RS-P were better fitted by the pseudo-second-order model, indicating chemical adsorption. Adsorption isotherm was better described by Redlich-Peterson isotherm, which suggested heterogeneous and multi-site adsorption, with a maximum adsorption capacity of 0.558 mmol g-1. The characterization of adsorbents before and after adsorption indicated that a combined action of electrostatic interaction and ion exchange was the primary mechanism of adsorption. Dynamic adsorption experiments with fixed-bed column displayed excellent water treatment capabilities. RS-P exhibited good reusability in 5 cycles without much deterioration in its adsorption performances. Complex co-existing ions impaired Zn2+ adsorption during real wastewater treatment. This research benefits agricultural waste recycling and provides safe water to ensure economic, social, and environmental sustainability.
Collapse
Affiliation(s)
- Fen Wang
- School of Chemistry and Chemical Engineering, Sichuan University of Arts and Science, Dazhou, 635000, People's Republic of China.
| | - XiaoLi Hu
- School of Chemistry and Chemical Engineering, Sichuan University of Arts and Science, Dazhou, 635000, People's Republic of China
| | - Cheng Tang
- School of Chemistry and Chemical Engineering, Sichuan University of Arts and Science, Dazhou, 635000, People's Republic of China
| | - Changlu Liu
- School of Chemistry and Chemical Engineering, Sichuan University of Arts and Science, Dazhou, 635000, People's Republic of China
| | - Zhaoju Zhu
- School of Chemistry and Chemical Engineering, Sichuan University of Arts and Science, Dazhou, 635000, People's Republic of China
| |
Collapse
|
|
2
|
Lignocellulosic materials as adsorbents in solid phase extraction for trace elements preconcentration. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
|
3
|
Taxonomic Diversity of Fungi and Bacteria in Azoé-NP® Vertical Flow Constructed Wetlands. WATER 2022. [DOI: 10.3390/w14050698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Plants, fungi, bacteria and protozoa are highly interconnected in constructed wetlands. These heterogeneous groups of organisms constitute a single system with complex internal trophic interactions. Thus, the joint activity of micro- and macroorganisms in constructed wetlands provides highly efficient wastewater treatment: both nutrients and complex organic substances can be effectively removed in branched trophic chains. The bacterial community of constructed wetlands has recently received much attention, while the fungal component remains less studied, particularly saprotrophic fungi. This paper reveals a taxonomic analysis of the cultivated saprotrophic fungi combined with the bacterial community in vertical flow constructed wetlands (VSCWs) operated by the Azoé-NP® process. These systems have unique features to affect the microbial community, which results in a high treatment efficiency and nitrogen removal. There are very few studies of saprotrophic fungi in VFCWs, while this work shows their abundance and diversity in VFCWs. We found 62 species of cultivated microscopic fungi and described the taxonomic composition of bacterial and fungal community at all wastewater treatment stages. In the studied VFCWs, we identified the species of micromycetes, which proved effective in the removal of contaminants. The data obtained can provide a deeper insight into the characteristics of Azoé-NP® systems and the treatment processes occurring in constructed wetlands.
Collapse
|
|
4
|
An Y, Zhang W, Liu H, Zhong Y, Hu Z, Shao Y, Chen Z, Ren Y, Wang B, Wang S, Zhang X, Wang X. Lignocellulose-Based Superabsorbent Polymer Gel Crosslinked with Magnesium Aluminum Silicate for Highly Removal of Zn (II) from Aqueous Solution. Polymers (Basel) 2021; 13:polym13234161. [PMID: 34883663 PMCID: PMC8659497 DOI: 10.3390/polym13234161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 11/21/2021] [Accepted: 11/25/2021] [Indexed: 11/22/2022] Open
Abstract
Lignocellulose (LCE) was ultrasonically treated and intercalated into magnesium aluminum silicate (MOT) clay to prepare a nano-lignocellulose magnesium aluminum silicate polymer gel (nano-LCE-MOT) for the removal of Zn (II) from aqueous solution. The product was characterised using nitrogen adsorption/desorption isotherm measurements, Fourier-transform infrared spectroscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The conditions for the adsorption of Zn (II) on nano-LCE-MOT were screened, and adsorption kinetics and isotherm model analysis were carried out to explore the adsorption mechanism and achieve the optimal adsorption of Zn (II). Optimal adsorption was achieved at an initial Zn (II) concentration of 800 mg/L at 60 °C in 160 min at a pH of 4.52. The adsorption kinetics were explored using a pseudo-second-order model, with the isotherm adsorption equilibrium found to conform to the Langmuir model. The maximum adsorption capacity of the nano-LCE-MOT polymer gel toward Zn (II) is 513.48 mg/g. The materials with adsorbed Zn (II) were desorbed using different media, with HCl found to be the most ideal medium to desorb Zn (II). The optimal desorption of Zn (II) was achieved in 0.08 mol/L HCl solution at 65 °C in 60 min. Under these conditions, Zn (II) was almost completely desorbed from the adsorbents, with the adsorption effect after cycling being slightly different from that of the initial adsorption.
Collapse
Affiliation(s)
- Yuhong An
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (Y.A.); (W.Z.); (H.L.); (Y.Z.); (Y.S.)
| | - Wanqi Zhang
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (Y.A.); (W.Z.); (H.L.); (Y.Z.); (Y.S.)
| | - Hui Liu
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (Y.A.); (W.Z.); (H.L.); (Y.Z.); (Y.S.)
| | - Yuan Zhong
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (Y.A.); (W.Z.); (H.L.); (Y.Z.); (Y.S.)
| | - Zichu Hu
- College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China; (Z.H.); (B.W.)
| | - Yali Shao
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (Y.A.); (W.Z.); (H.L.); (Y.Z.); (Y.S.)
| | - Zhangjing Chen
- Department of Sustainable Biomaterials, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060, USA;
| | - Yukun Ren
- Bioimaging Research, Sanofi Global R&D, Framingham, MA 01702, USA;
| | - Boyun Wang
- College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China; (Z.H.); (B.W.)
| | - Sunguo Wang
- Sungro Bioresource & Bioenergy Technologies Corp., Edmonton, AL T6R3J6, Canada;
| | - Xiaotao Zhang
- College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China; (Z.H.); (B.W.)
- Inner Mongolia Key Laboratory of Sandy Shrubs Fibrosis and Energy Development and Utilization, Hohhot 010018, China
- Correspondence: (X.Z.); (X.W.)
| | - Ximing Wang
- College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China; (Y.A.); (W.Z.); (H.L.); (Y.Z.); (Y.S.)
- Inner Mongolia Key Laboratory of Sandy Shrubs Fibrosis and Energy Development and Utilization, Hohhot 010018, China
- Correspondence: (X.Z.); (X.W.)
| |
Collapse
|