COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Nan Zhou,Yifan Wang,Liyang Huang,Jingang Yu,Huanli Chen,Jiajie Tang,Fengjuan Xu,Xiangyang Lu,Mei-e Zhong,Zhi Zhou
Surface modification of biochar is significant to obtain more functionalized material for contaminants immobilization. In situ modification, modifying the biochar while the conversion process, was applied by a novel wet pyrolysis system. By using phosphoric acid as working medium, liquid/air interface was created to introduce low content of oxygen, under the control of appropriately settled reaction temperature. Followed with the addition of sodium carbonate to neutralize the system and increase mineral species, effective biochar adsorbent attached with large quantity of acidic oxygenic and phosphoric groups, and carbonate anions was finally produced. The biochar showed excellent decontamination performance of lead with a high adsorption capacity of 316 mg·g −1 and removal efficiency larger than 95%. The alteration of the characteristics after the adsorption confirmed the adsorption mechanism is the bi-function of surface coordination and precipitation. This novel route is easy handling and energy saving, promising it to be a reliable way to produce biochars with attractive surface properties for environmental decontamination.
研究领域:
环境科学
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土壤修复
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2018
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IF 3.849
Tao Li,Shaoyu Lü,Shaofei Zhang,Chunmei Gao,Mingzhu Liu
Excessive application of fertilizers and their losses have exerted a great threat on soil environment. Slow- or controlled-release fertilizers have been widely produced to alleviate the problem. However, most of them can not remedy contaminated soil environment, and even make it worse. To improve nutrient use efficiency and reduce soil environmental pollution, lignin, an extensive biomass source, was used to synthesize a lignin-based superabsorbent (LPA), which was then introduced into the fertilizer as an outer coating material to obtain lignin-based multifunctional fertilizer (LMF). Results showed that the introduction of LPA can improve water-holding and water-retention capacity of soil and nutrients release behavior of fertilizers. The cumulative release rates of nitrogen, phosphorus and zinc were 79.5%, 46.7% and 60.1% after 25 days, respectively. Additionally, LMF can efficiently immobilize and restrict the migration of bivalent lead (Pb(II)) by complexation with lignin. About 91.7% of Pb(II) was immobilized after soil-sand mixture with Pb(NO 3 ) 2 was treated by LMF. The pot experiments indicated that the LMF exhibited a positive effect on the growing of corn in Pb(II)-contaminated soil. Therefore, this work provides a promising fertilizer to improve the utilization efficiency of water, sustained release of nutrients, and immobilization of Pb (II) in contaminated soil.
研究领域:
环境科学
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农业科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
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IF 8
Qi Li,Xiaolei Yang,Changning Li,Aolei He,Shanmu He,Xuemei Li,Ying Zhang,Tuo Yao
Phosphate materials (PMs) combine with phosphate solubilizing bacteria play an essential roles in lead (Pb) immobilization, but their resulting ability to reduce Pb bioavailability may vary depending on PMs used. In this study, Pseudomonas edaphica GAU-665 and three PMs: tricalcium phosphate, calcium phytate and nano-hydroxyapatite were respectively encapsulated into bio-beads by sodium alginate, which immobilization efficiency of Pb 2+ were 99.11%, 97.76% and 99.02% at initial Pb 2+ concentration of 200 mg L −1 , respectively. The Pb 2+ immobilization performance of bio-beads under different conditions and their organic acids secreted were examined. Most Pb 2+ was immobilized by bio-beads through combined functions of adsorption, precipitation, ion exchange and biomineralization, accompanied by the formation of more stable compounds such as Pb 3 (PO 4 ) 2 , Pb 5 (PO 4 ) 3 OH and Pb 5 (PO 4 ) 3 Cl. Meanwhile, pot experimental results indicated that the inoculation of CPhy (calcium phytate) bio-beads with PSB have highest biomass and root growth of oat ( Avena sativa L.) in Pb-stressed compared with CK, which increased the content of chlorophyll b (167.51%) in shoot. In addition, the CPhy bio-beads enhance the peroxidase, catalase activities and reduce the malondialdehyde content to alleviating lead physiological toxicity in oat, which reductions the Pb accumulation in shoot (52.06%) and root (81.04%), and increased the residual fraction of Pb by 165.80% in soil. These findings suggest the bio-beads combined with P. edaphica GAU-665 and calcium phytate is an efficient Pb immobilization material and provided feasible way to improve safety agricultural production and Pb-contaminated soil remediation.
研究领域:
环境科学
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农业
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土壤学
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植物生理学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Ziwei Chen,Weiyi Ji,Xiangping Xian,S. Thomas Ng,Chi Sun Poon
Vitrification technology is an effective solution for rapid stabilization and resource utilization of heavy metal-containing hazardous waste. Waste soda-lime-silica (SLS) glass is an abundantly available vitrification flux and can contribute to the sustainable waste-treating-waste strategy. Understanding the interactions between the SLS glass network and heavy metals is vital for optimizing the vitrified composition systems. This study adopted molecular dynamics simulations and various experimental techniques to comprehensively elucidate the immobilization mechanism of the representative heavy metal ion of Pb 2+ in SLS glass. Our results indicated Pb ions were incorporated into the glass matrix primarily as three forms, namely, [PbO 3 ] triangles, [PbO 4 ] tetrahedra, and highly coordinated [PbO n ] ( n > 4) polyhedra. With the increasing amount of Pb ions immobilized, the dominant role of Pb ions transformed from the network modifiers of highly coordinated [PbO n ] units to the network formers of [PbO 3 ] and [PbO 4 ] units. As a result, the degree of network polymerization first decreased and then increased with the turning point of 7.5 wt% PbO content. Different from regular [SiO 4 ] tetrahedra, the [PbO 3 ] and [PbO 4 ] units were less stable and prone to deformation, resulting in the small inter-polyhedral bond angle Pb-O-Si. The structural transformations significantly affected the macroscopic thermal and chemical stability of the vitrification products. Generally, the vitrification products with a PbO content of below 11 wt% were allowed to be recycled in construction materials according to the Chinese standard. This study has a high value for tuning vitrification chemistry and developing green Pb-containing vitrification materials.
研究领域:
材料科学
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环境工程
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固态化学
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废物处理
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分子模拟
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）