ACS ES&T Engineering
·
2024
·
IF 7.4
Huiwen Zhang,Runhao Zhang,Wenya Li,Shiying Pan,Ming Li
Large amounts of agricultural waste that are not properly disposed of will result in resource wastage and environmental pollution. Herein, a series of agricultural waste hydrochars (AWHs) were prepared from hydrothermal cogasification of rice husk and chicken manure and used as a phosphorus (P) and heavy metal (HM) stabilizer for improving soil quality. Crop growth could be promoted at 1% AWH addition. AWH-V provided a renewable alternative for poor and hardening soil, and the available phosphorus effectively increased from 29 to 85 mg/kg. AWH-III was especially suitable for application in Cd-contaminated soil. The accumulation of Cd in crops also decreased by 46.10% under HM stress. An increased abundance of HM-tolerant rhizosphere microbial communities combined with adsorption of AWHs promoted HM passivation and stabilization. Interaction effects on phosphate and HMs could be summarized as competitive adsorption, cation and anion balance, and P & HM retention. This work provides a promising multiobjective pathway for agricultural waste management, soil quality improvement, and crop growth promotion.
研究领域:
环境科学
·
农业科学
·
微生物学
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2019
·
IF 4.527
Huanlong Peng,Yukun Wu,Tong Guan,Wei He,Liang Xu,Yongmei Liang,Wei Liu
In this study, we analyzed the effects of sludge aging pre-treatment on the stabilization mechanisms of heavy metals during sludge pyrolysis . First, the form of copper (Cu) and chromium (Cr) was conducted using the sequential extraction procedure proposed by the European Community Bureau of Reference (BCR). The stabilization mechanisms for the sludge pyrolysis of Cu and Cr were then analyzed using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Results indicate the following: 1) with aging pre-treatment, the improvement in adsorption performance and the formation of newly crystallized materials, like polyhydroxy copper phosphate and chromium phosphate minerals , occur concurrently with the stabilization of heavy metals during pyrolysis; 2) after four weeks of aging, active functional groups like amino and carboxyl groups were significantly sharpened, and caused sustained complexation of the heavy metals. Results suggested that the aging pre-treatment aided the stabilization of heavy metals during sludge pyrolysis. Notably, the aging effect can decrease the potential ecological risk of heavy metals.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
PubMed
高影响因子
WASTE MANAGEMENT
·
2022
·
IF 8.816
Zhikun Zhang,Yanli Wang,Yuqi Zhang,Boxiong Shen,Jiao Ma,Lina Liu
The environmental risk of heavy metals in hazardous municipal solid waste incineration fly ash (FA) is one of the most important concerns for its safely treating and disposing. This study investigated the stabilization behavior of heavy metals in FA using coal fly ash (CFA) as an additive via hydrothermal treatment. The effects of water washing pre-treatment and FA/CFA ratio on leaching behavior, speciation evolution, and risk assessment of heavy metals were studied. The results showed that 96.6–98.0 % of Cl can be effectively removed by water washing pre-treatment and hydrothermal treatment. Most heavy metals (Cr, Cu, Ni, Pb and Zn) (>91.5 %) were stabilized in the hydrothermal product, rather than transferred to liquid phase. Tobermorite can be synthesized by adjusting Ca/Si ratio with the addition of CFA. The heavy metals were transferred into more stable residue fractions with increasing CFA addition, which resulted in the significant reduction of leaching concentrations and risk assessment code (RAC) of heavy metals. Among, the product with 30% CFA exhibited the most superior performance with the lowest leaching concentrations of heavy metals and RAC was at no risk level (<1). In addition, the economic performance of hydrothermal treatment exhibited a potential advantage by comparing with FA-to-cement, FA-to-glass slags and FA-to-chelating agent & cement solidification/stabilization. Therefore, the hydrothermal treatment coupled with water washing pre-treatment would be a promising method for the detoxification of FA, as well as synergistic treatment of FA and CFA.
研究领域:
环境科学
·
废物处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Qiang Xian,Xin Xiao,Jiaping Yu,Yi Gan,Li Chen,Xinmiao He,Enchao Wang,Hui Dan,Lin Zhu,Yi Ding,Tao Duan
The immobilization of iodine waste suffers from serious iodine loss during heat treatment. Herein, we reported on the high iodine retention immobilization of simulated radioiodine-contaminated Bi0–SiO2 sorbent in B–Bi–Zn oxide glass using Bi2O3 as a stabilizer under a N2 atmosphere. The effects of the Bi2O3 content and sintering atmosphere on the iodine immobilization behaviors (iodine retention ratio, phase composition, microstructure, and chemical stability) were investigated. It was found that the decomposition of BiI3 was prevented by adding Bi2O3 and sintering in a N2 atmosphere. The iodine retention ratio in the obtained glass waste form was significantly enhanced with increasing Bi2O3 content and sintering in the N2 atmosphere due to the synergistic effect. The achieved record-high iodine retention (92.22 ± 2.6%) was much higher than that of conventional heat treatment route (18.01 ± 3.5%). The results demonstrated that iodine was effectively immobilized through the formation of stable BixOyI (Bi5O7I and BiOI). Furthermore, the obtained iodine waste form exhibited excellent compactness and chemical stability. Owing to its high iodine retention ratio, this route can be employed to effectively immobilize radioactive iodine.
研究领域:
材料科学
·
核废料管理
✓ 已验证
DOI
高影响因子
RESOURCES CONSERVATION AND RECYCLING
·
2020
·
IF 8.086
Wei Ma,Fanling Meng,Dong Qiu,Yuanyuan Tang
The release and migration of heavy metals from the industrial sludge has become one of the most serious environmental threats, which is urgently required to be relieved. Heavy metals can be stabilized by using ceramic precursors, via interactions with aluminum (Al), silicon (Si) and iron (Fe) as the major components. The sewage sludge incineration ash (SSA) can be recognized as a type of ceramic raw materials due to the abundant content of Al, Si and Fe, which make it possible to be beneficially used for heavy metal stabilization. This study investigated the stabilization of lead (Pb), zinc (Zn), and copper (Cu) after ceramic sintering with the SSA as ceramic precursors, and further explored the influences of heavy metal types and contents on phase transformation and immobilization effect. Results show that the heavy metals could achieve co-stabilization by the SSA in reaction series with different metal types and contents (Pb-Zn and Pb-Cu). Pb tends to combine with Al, Si and P to form PbAl 2 Si 2 O 8 and Pb 3 (PO 4 ) 3 , while Zn was finally incorporated into a spinel solid solution (ZnFe x Al 2-x O 4 ). Meanwhile, Cu is more likely to combine with Fe with the generation of CuFe 2 O 4 which will be transformed to CuFeO 2 with elevated temperatures. In both Pb-Zn and Pb-Cu series, the Zn and Cu were distributed in crystal grains while Pb was in regions around the grains. Moreover, the leachability of Pb, Zn and Cu can be substantially decreased with the eventual incorporation of the heavy metals into different product phases by the SSA. Therefore, through this study the coimmobilization of heavy metals in the simulated industrial waste can be realized by the utilization of sewage sludge incineration ash as ceramic precursors.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
HYDROMETALLURGY
·
2020
·
IF 3.338
Xi Chen,Xincun Tang,Zhihao Rong,Liping Wu,Pin Deng,Yang Wang,Xing Li,Liuchun Huang,Wei Dang
This paper presents an eco-friendly method for recovery of cadmium by solvent extraction and stabilization of arsenic through one-pool treatment on arsenic-rich flue dust. The morphology-controlled scorodite can be realized by adjusting reaction temperature. It is worth emphasizing that the arsenic-immobilized scorodite precipitates have superior crystallinity which exhibit excellent safety for long-term storage. In addition, the advantage brought about by taking hydrogen peroxide as leaching agent is that leachate is weakly acidic, which removes the need to add a large amount of neutralizing agent and facilitates the synthesis of scorodite. The results show that 97.3% of arsenic was leached from arsenic-rich flue dust and then 92.8% of the leached arsenic was transferred into scorodite with the recovery of 81.5% of cadmium under the optimal conditions. We hope that this work will provide a facile and environmentally friendly protocol for those interested in developing a new strategy for simultaneously recovering and stabilizing toxic heavy metal ions from industrial dust.
研究领域:
环境科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Junjun Ma,Tao E,Shuyi Yang,Liang Chen,Ying Cheng,Jia Yu,Yun Li
Stabilizing Cr(III) in tannery sludge (TS) via harmless method has always been the goal of environmental pollution treatment. In this study, a simple method to stabilize Cr(III) in TS is proposed via adding kaolin, based on the fact a large amount of organic matter contained in TS. Comprehensive characterizations confirm that kaolin can stabilize Cr(Ⅲ) via its abundant –OH and lamellar structure. Moreover, there are hydrogen bond interactions and ligand exchange-surface complexation between organic matter and kaolin, which is more conducive to form a stable ternary complex with Cr(III), in a state of organic matter-Cr(III)-kaolin. Simultaneously, the BCR sequential extraction experiment shows that the unstable water and acid soluble state of Cr(III) are reduced (from 0.61% to 0.35%), which further indicates that the stabilization of Cr(III) is successful.
研究领域:
环境科学
·
污染治理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Silan Zhao,Lifang Gong,Guangzhao Guo,Huimin Liu,Shuai Li,Lu Dong,Shuang Deng,Hongyun Hu
A large number of fly ash samples from mechanical grate furnaces at a municipal solid waste incineration (MSWI) plant were examined including Se speciation and content. Se leaching behaviors before and after solidification/stabilization(S/S) treatment were comparatively studied. The results showed that Se in the MSWI fly ash was present mainly in the form of selenite with small amounts of physically adsorbed SeO 2 (s). Se in the low alkalinity ash (pH ∼ 7) tended to be more leachable than that in the high alkalinity ash (pH ∼ 12). The chelation treatment would further raise the risk of Se leaching into the environment from the low alkalinity ash (pH ∼ 7). Three Fe-containing additives (zero-valent iron (ZVI)、α-Fe 2 O 3 and Fe 3 O 4 ) were introduced, respectively in attempt to immobilize Se in the low alkalinity MSWI fly ash. A strong positive effect was found with ZVI addition in terms of Se leaching from low alkalinity chelated MSWI ash. Comparatively, iron oxides showed no obvious effect. The adjustment to ash alkalinity (CaO addition) exhibited a comparable effect to ZVI addition, which provided another option to control Se leaching from low alkalinity chelated ash.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Zhiwen Xu,Zhiyuan Liang,Huaishuang Shao,Qinxin Zhao
The dioxins and leachable heavy metals in municipal solid waste incineration (MSWI) fly ash made it a hazardous waste. Microwave hydrothermal with four common additives, Na 2 S, Na 2 SiO 3 , Na 2 B 4 O 7 or H 3 BO 3 , was researched at different temperatures, L/S ratios, time and additive concentrations by single factor and orthogonal methods to achieve effective heavy metal stabilization and waste reuse of MSWI fly ash. The samples were investigated by XRD, BET, SEM, ICP-MS to determine the influence of additive-assisted microwave hydrothermal on heavy metals stabilizing. According to the results of the orthogonal study, the degree of influence of each parameter heavy metals stabilization was in the order of additive, temperature, additive concentration, time and L/S ratio. Single-factor experiments suggested that the conditions of 125 °C, 10 min, 3 mol/L Na 2 S and 2 mL/g were enough for the leaching concentration of heavy metals meeting the specified limitation of China. The results of analyses confirmed that microwave hydrothermal treatment with Na 2 S could enhance heavy metals stabilizing by forming zeolites for adsorption, precipitation and convert heavy metals to a more stable state. Microwave hydrothermal with Na 2 S was a promising method to manage MSWI fly ash, which greatly decrease the reaction time and realize wastes utilization.
研究领域:
环境科学
·
废物管理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Wuming Xie,Fengping Zhou,Jingyong Liu,Xiaolin Bi,Zijun Huang,Yuhui Li,Dongdong Chen,Haiyuan Zou,Shuiyu Sun
A large amounts of red mud (RM) and spent pot lining (SPL) produced during aluminum extraction and electrolysis are restricting the sustainable development of aluminum industry. In this study, an integrated route for synergistic reutilization of RM and SPL was proposed to deal with this dilemma. To improve the recovery efficiency of metallic Fe, Si and Al were firstly extracted from RM to synthesize 4A-zeolite. Afterwards, reductive roasting process was employed for iron recovery using SPL as reducing agent. Metallic Fe obtained from the reductive roasting were collected by wet magnetic separation to yield valuable iron concentrate from nonmagnetic residues. Thermodynamic studies using Factsage 7.1 software were implemented to determine the transformation of mineral phases, and orthogonal design experiments containing various parameters like SPL blend ratio, temperature, and retention time were investigated to optimize the conditions. The reductive process performed at blend ratio of 7 wt%, temperatures of 900 °C and 240 min retention time under N 2 atmosphere induced higher conversion yield of metallic Fe (88.84 wt%). Soluble fluorides in SPL resulted in its hazardous properties, but the formation of cuspidine (Ca 4 Si 2 F 2 O 7 ) in nonmagnetic residues suggested that the route not only reutilized valuable components, but also stabilized the hazardous element.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2012
·
IF 5.167
Chuanzhuang Zhao,Guangcui Yuan,Charles C. Han
Poly(N-isopropylacrylamide) (PNIPAM) microgels are adsorbable to the surface of polystyrene (PS) microspheres in the experimental temperature range (25–40 °C) and can induce aggregation of microspheres through the bridging mechanism. The bridging mechanism proceeds in two elementary steps: the first is an adsorption (negligible desorption relatively) of free microgel to one microsphere surface, and the next is a reversible connection of the adsorbed microgel to another microsphere surface. The surface coverage is found as an important factor in triggering the stabilization, aggregation, and gelation of the mixtures. And most importantly, the nonnegligible dynamic disconnection of a bridge is the essential prerequisite for structure or state transition. For mixtures with the same concentration of microsphere, depending on the concentration of microgel, various transitions can be induced by changing temperature, including the transition from a weaker gel to a stronger gel, from a fluid to a bridging gel and from a depletion gel to a bridging gel.
研究领域:
材料科学
·
胶体化学
✓ 已验证
DOI
高影响因子
ELECTROPHORESIS
·
2020
·Vol. 41
·期 15
·1273-1279
·
IF 3.081
Litao Zhao,Fanghong Luo,Anting Wang,Jing Zhang,Yuanhang Wang,Liangtao Zhao,Zhaoyan Wang,Qiaosheng Pu
Mutations in the potassium channel genes may be linked to the development of epilepsy and affect the blood potassium levels. Therefore, accurate determination of potassium in the blood will be critical to diagnose the cause of epilepsy. CE is a competent technique for the fast detection of multiple ions, but complicated matrices of a blood sample may cause significant variation of migration times and the peak shape. In this work, a procedure for rapid stabilization of the capillary inner surface through preflushing of a blood sample was employed. The process takes only 40 min for a capillary and then it can be used for more than 2 weeks. No pretreatment of the blood sample or other surface modification of the capillary is needed for the analysis. The RSDs of the migration time and peak area were reduced to 1.5 and 5.1% from 12.6 and 14.5%, respectively. The proposed method has been successfully applied to the determination of the potassium contents in the blood sample of patients with epilepsy at different stages. The recoveries of potassium ions in these blood samples are in a range from 86.5 to 104.5%.
研究领域:
医学诊断
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）