JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
·
2026
·
IF 2.4
Wenlong Hui,Yanan Zhao,Meiqi Ren,Qiang Wei,Zhiqiang Dai,Lin Zhu,Lili Zhang,Xiaosheng Zhao
This study used excess sludge from urban wastewater treatment plants as a raw material to prepare sludge-based activated carbon (SAC) via ZnCl2 activation and high-temperature carbonization. The structure of SAC was characterized using XRD, SEM, and FTIR, and the adsorption performance of SAC toward Cr(VI) in wastewater was systematically investigated. The results showed that, under the conditions of a ZnCl2 activator concentration of 1 mol/L, a carbonization temperature of 550°C, and a heating rate of 10 ℃/min, the prepared SAC had a maximum adsorption capacity of 57.90 mg/g for Cr(VI) in wastewater, and could achieve 100% removal of Cr(VI) at an initial concentration of 10 mg/L. The adsorption process conformed to the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating that chemical adsorption was the rate-controlling step, and Cr(VI) was mainly adsorbed in a uniform monolayer on the SAC surface. This study provides a feasible technical route for sludge resource utilization and Cr(VI) wastewater treatment.Implications:In this study, activated carbon was prepared using sludge as the raw material, realizing the reduction and resource utilization of sludge. This method not only solves the problems of land occupation and secondary pollution caused by sludge storage and landfilling, but also reduces the preparation cost of activated carbon, which conforms to the environmental protection policies for solid waste recycling.To address the pollution of highly toxic Cr(VI) in wastewater, the as-prepared sludge-based activated carbon shows excellent adsorption performance, which can efficiently remove Cr(VI) from aqueous solution and significantly reduce the biological toxicity and environmental risks of heavy metals.This work constructs a cyclic utilization pathway of “sludge disposal–functional carbon preparation–heavy metal wastewater treatment,” providing an economically feasible technical scheme for the treatment of chromium-containing industrial wastewater. It has important theoretical value and practical application significance for promoting solid waste resource utilization, improving the water ecological environment and ensuring water environmental safety.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yimin Huang,Xueyan Li,Yan Peng,Hua Zhang,Anxian Shi,Xiujun Deng,Baoling Wang,Yingtang Zhou,Bing Wang,Guangzhi Hu
The discharge of hexavalent chromium [Cr(VI)] in industrial wastewater into the natural environment can seriously cause harm to the environment and human health. We modified chitosan (CS) with Co and polydopamine (PDA) to synthesize a spherical adsorbent (CS–Co/PDA HCl ) for Cr(VI) removal from wastewater. Co doping can help CS–Co/PDA HCl maintain a high adsorption capacity (666.7 mg g -1 ) for Cr (VI) while retaining a complete bead shape after multiple recycling. In addition, CS–Co/PDA HCl can maintain 96% of its initial adsorption capacity after five adsorption cycles, demonstrating a strong regeneration ability. Under competitive conditions, the adsorption capacity of CS–Co/PDA HCl for Cr(VI) greatly exceed its adsorption capacity for Ni (II) and Mn (II). Because of the high selectivity of CS–Co/PDA HCl for Cr(VI), 1 kg of CS–Co/PDA HCl (cost approximately $31) could reduce the concentration of Cr(VI) in 87 m 3 of secondary electroplating wastewater containing various complex components to the drinking water standard. Owing to the high selective adsorption capacity of CS–Co/PDA HCl for Cr(VI) and its good regeneration ability and expected economic feasibility, CS–Co/PDA HCl can find potential applications in removing Cr(VI) from real wastewater .
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jun Shang,Yanni Guo,Deliang He,Wei Qu,Yining Tang,Lei Zhou,Rilong Zhu
A novel graphene oxide-dicationic ionic liquid composite (GO-DIL) was prepared by modifying graphene oxide (GO) with a dicationic ionic liquid (DIL), 3,3′-(butane-1,4-diyl) bis (1-methyl-1H-imidazol-3-ium) chloride ([C 4 (MIM) 2 ]Cl 2 ). GO and GO-DIL were characterized by SEM, BET, FTIR, and XPS, and the materials were used for Cr(VI) adsorption. Batch adsorption studies showed that adsorption reached equilibrium within 40 min, and the optimal pH was 3, where the electrostatic attraction between GO-DIL and Cr(VI) was maximized. The maximum theoretical Cr(VI) adsorption capacity ( q m ) was 271.08 mg g −1 , and q m remained above 228.00 mg g −1 after five cycles. The adsorption data were fitted well by both the pseudo-first-order kinetic model and the Langmuir model. Furthermore, thermodynamics calculations revealed that adsorption was a spontaneous endothermic process. Importantly, electrostatic attraction between Cr(VI) and the protonated imidazole N + of GO-DIL played a critical role in Cr(VI) adsorption, and Cr(VI) was reduced to Cr(III). Thus, GO-DIL is predicted to be an effective adsorbent for Cr(VI) and other heavy metal ions in wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 8
·4713-4722
·
IF 3.361
Zhenyu Yan,Ting Wu,Guigan Fang,Miao Ran,Kuizhong Shen,Guangfu Liao
Recently, research interest in the application of lignin is growing, especially as adsorbent material. However, single lignin shows unsatisfactory adsorption performance, and thus, construction of lignin-based nanocomposites is worth considering. Herein, we introduced graphene oxide (GO) into lignin to form lignin/GO (LGNs) composite nanospheres by a self-assembly method. FTIR and 1H NMR spectroscopy illustrated that lignin and GO are tightly connected by hydrogen bonds. The LGNs as an environmental friendly material, also exhibit excellent performance for Cr(VI) removal. The maximum sorption capacity of LGNs is 368.78 mg g−1, and the sorption efficiency is 1.5 times than that of lignin nanospheres (LNs). The removal process of Cr(VI) via LGNs mainly relies on electrostatic interaction, and it also involves the reduction of Cr(VI) to Cr(III). Moreover, LGNs still have high adsorption performance after repeating five times with the sorption capacity of 150.4 mg g−1 in 200 mg g−1 Cr(VI) solution. Therefore, the prepared lignin–GO composite nanospheres have enormous potential as a low-cost, high-absorbent and recyclable adsorbent, and can be used in wastewater treatment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2021
·
IF 4.837
Zhongxuan Xu,Diandi Li,Yuping Tan,Qinyu Yang,Han Xiong,Jiguang Li,Hong Deng,Zhang Lin
Microbial treatment of heavy metals is a low-cost and environmentally friendly method. During the treatment of chromium pollution, environmental media has a great impact on the efficiency of bacteria Cr immobilization. However, when Cr(VI) coexist with different metal cations , the reduction of Cr(VI) and the immobilization of Cr by bacteria are still unclear. In our research, although bacteria were significantly promoted the reduction of Cr(VI) with the coexistence of Mn(II), the bacteria produced the maximum of soluble organic Cr(III). In the performance of immobilization Cr, Mg(II) group has the highest chromium immobilizing rate. In addition, Cd(II) has the strongest inhibitory effect on Cr(VI) reduction and Cr immobilization. The SEM results show that Cr were stored in the cells. However, XRD analysis did not demonstrate the crystal structure. Our research investigated the ability of bacteria to reduce and immobilize Cr with the coexistence of 9 different metal ions, and provided a reference for a deeper understanding of the relationship between bacteria and metal ions.
✓ 已验证
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 8
·942
·
IF 3.52
Zhiying Yan,Zijuan He,Mi Li,Lin Zhang,Yao Luo,Jiao He,Yongjuan Chen,Jiaqiang Wang
In order to further improve the photocatalytic performance of the SiO2/TiO2composite under visible light irradiation, curcumin-doped SiO2/TiO2nanocomposites were synthesized via directly incorporating it into the structure of SiO2/TiO2during the synthesis using an inexpensive and readily available natural pigment (curcumin) as doping agent. The physicochemical properties of SiO2/TiO2nanocomposites were characterized in detail by X-ray diffraction, transmission electron microscopy, Fourier transform-infrared spectroscopy, N2adsorption–desorption isotherms, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectroscopy. The results indicate that all SiO2/TiO2nanocomposites exhibited an anatase phase with a typical mesoporous structure. It was found that the dope of curcumin in the SiO2/TiO2composite could decrease the crystal size, slightly improve the specific surface areas, significantly enhance the visible light absorption, and effectively narrow the band gap energy from 3.04 to 10(eV). Compared with bare SiO2/TiO2, the curcumin-doped SiO2/TiO2resulted in enhanced photocatalytic reduction activity for Cr(VI) under visible light irradiation, and the CTS (12) sample with the appropriate content of curcumin of 12 wt % shows the photocatalytic yield reaching 100% within 2.5 hours, which is larger than CT (12) without silica. This could be attributed to the curcumin doping and the synergetic effects of SiO2and TiO2in SiO2/TiO2nanocomposites.Keywords:curcumin pigment;SiO2/TiO2nanocomposites;visible photocatalyst;reduction of Cr (VI)
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Yueying Wang,Xuetao Hu,Wenting Li,Xiaowei Huang,Zhihua Li,Wen Zhang,Xinai Zhang,Xiaobo Zou,Jiyong Shi
A novel fluorescent probe based on the static quenching and the inner filter effect between boron nitrogen co-doped carbon quantum dots (B, N-CDs) and Cr(VI) was developed for the quantitative determination of Cr(VI) in real water samples. B, N-CDs were prepared using the hydrothermal method with ammonium citrate and bis(pinacolato) diboron as raw materials. Compared with undoped CDs, the fluorescence properties of the B, N-CDs were improved. The fluorescence quantum yield of the B, N-CDs was as high as 59.01%. After optimization of the experimental parameters, the B, N-CDs could be used as a fluorescence probe to detect Cr(VI). Strong linear correlation ( R 2 = 0.9986) was established in the Cr(VI) concentration range 0.3–500 μM, and a detection limit of 0.24 μM was achieved. Moreover, the B, N-CDs successfully detected Cr(VI) in real water samples, indicating that they have broad application prospects in the sensitive detection of Cr(VI).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hang Yang,Siyu Huang,Yi Zhang,Boxun Zhou,Sanjrani Manzoor Ahmed,Huamin Liu,Yaowen Liu,Yong He,Shibin Xia
In this study, secondary pyrolysis oil-based drilling cuttings ash (OBDCA-sp) was used to remediate chromium (Cr)-contaminated soil. The effects of the OBCDA-sp mesh, OBCDA-sp dosage and soil moisture content on the removal of Cr (VI) were investigated. Subsequently, a kinetic experiment was conducted where the pseudo-first-order and pseudo-second-order kinetic models both fitted well on OBDCA-sp with the adsorption process of Cr (VI) in soil. The change of the chromium form indicated that the addition of OBCDA-sp transformed Cr from an effective state to a stable form, reducing its mobility and bioavailability . X-ray diffraction and Fourier transform infrared spectroscopy analysis were used to verify the potential mechanism of Cr (VI) removal; Ba, Fe, S, and P elements in OBCDA-sp were observed to play a significant role in the reduction of Cr (VI). The results from this study indicate that OBCDA-sp could be an emergent and promising alternative for the remediation of Cr-contaminated soil.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Peng Wang,Cong Xie,Tong Song,Ping Yang
Amorphous SnO 2 was coupled on the surface of mixed-phase TiO 2 nanoflowers (NFs) by a solvothermal synthesis. Various characteristics confirms the formation of SnO 2 /TiO 2 heterostructures. As-prepared amorphous SnO 2 /TiO 2 heterostructures revealed uniform morphology and enhanced photoelectrochemical performance. Underfull-spectrum light irradiation, the SnO 2 /TiO 2 heterostructures with an optimized SnO 2 ratio revealed the best photoreduction performance, in which Cr(VI) of 99% was removed within 30 min. This is ascribed to the introduction of amorphous SnO 2 , which adjusted the band gap structure, increased specific surface area of TiO 2 NFs, and greatly enhanced the photoelectric conversion efficiency. The mechanism of the heterostructure formation and enhanced photoreduction for Cr(VI) ions were discussed. The TiO 2 NFs with a mixture phase helps to improve the separation efficiency of photogenerated carriers. This result provides an unique idea for the construction of heterostructures.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL QUALITY
·
2021
·Vol. 50
·期 5
·1123-1134
·
IF 2.751
Li Liu,Jinxin Zhao,Weizhao Yin,Sihao Lv,Mei Su,Ping Li,Xiangyu Zheng,Penchi Chiang,Jinhua Wu
In this study, a collaborative system of Fe 0 and mixed anaerobic microorganisms was established for remediating chromium (Cr)-contaminated soil and restraining the translocation of Cr from soil to swamp cabbage ( Ipomoea aquatica Forssk.). Solid phase characterization demonstrated that more reactive secondary minerals such as green rust, magnetite, and lepidocrocite were generated in the composite system as compared with the Fe 0 -only system. Hence, the Fe 0 –microorganisms composite system achieved a remarkably higher aqueous Cr(VI) removal of 85.6%, 2.9 times higher than that in the Fe 0 -only system. After 14 d remediation, easily available Cr(VI) and Cr total species such as water-soluble, exchangeable, and bound-to-carbonates were converted to less available Cr(III) and Cr total species (e.g., Fe–Mn oxides-bound and organic matter-bound species) because of the production of Cr–Fe hydroxides and oxides [Cr x Fe 1−x (OH) 3 or Cr x Fe 1−x OOH] on the Fe 0 surface. A pot experiment showed that Cr uptake by swamp cabbage after the composite system remediation was suppressed by 69.1%, two times higher than that after the Fe 0 -only system remediation. Excessive Fe uptake by swamp cabbage also was efficiently inhibited by the composite system treatment due to enhanced Fe hydroxides and oxides production on the Fe 0 surface because of biological corrosion and mineralization. These results indicated that Fe 0 –microorganisms composite system remediation could efficiently enhance Cr(VI) immobilization and decrease its bioavailability and bioaccumulation by plants, which is a promising technology in Cr-contaminated soil remediation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Bo Ma,Jun Yao,Zhihui Chen,Bang Liu,Jonghyok Kim,Chenchen Zhao,Xiaozhe Zhu,Victor G. Mihucz,Tatiana Minkina,Tatjana Šolević Knudsen
In this study, a polydopamine (PDA) modified attapulgite (ATP) supported nano sized zero-valent iron (nZVI) composite (PDA/ATP-nZVI) was rapidly synthesized under acidic conditions, and employed to alleviate Cr(VI) toxicity from an aqueous solution. Kinetic studies revealed that Cr(VI) adsorption process followed the pseudo-second order model, suggesting chemisorption was the dominant adsorption mechanism. Liu isotherm adsorption model was able to better describe the Cr(VI) adsorption isotherm with the maximum adsorption capacity of 134.05 mg/g. The thermodynamic study demonstrated that the adsorption process occurred spontaneously, accompanied by the increase in entropy and endothermic reaction . Low concentrations of coexisting ions had negligible effects on the removal of Cr(VI), while high concentrations of interfering ions were able to facilitate the removal of Cr(VI). Reactive species test revealed that Fe 2+ played a key role in Cr(VI) reduction by PDA/ATP-nZVI. PDA enhanced the elimination of Cr(VI) via donation of electrons to Cr(VI) and acceleration of Fe 3+ transformation to Fe 2+ . Furthermore, PDA was able to effectively inhibit the leaching of iron species and generation of ferric hydroxide sludge . Mechanistic study revealed that 72% of Cr(VI) elimination was attributed to reduction/precipitation, while 28% of Cr(VI) elimination was due to the surface adsorption.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advances in Materials Science and Engineering
·
2021
·
IF 1.726
Wenjuan Zhang,Yaxian Wang,Yulong Fei,Youliang Wang,Zhaoxiong Zhang,Miao Kou,Qiancheng Feng,Sheng Wang,Xueyan Du
A novel and efficient route is proposed to fabricate Fe3O4/polypyrrole (Fe3O4/PPy) nanotubes via a one-pot process. The one-pot strategy involves the synthesis of Fe3O4/PPy nanotubes by oxidative polymerization of pyrrole (Py) monomer using Fe3+ as an oxidant in the presence of methyl orange (MO) and Fe3+ used as iron source to form Fe3O4 simultaneously in basic conditions without adding any additional iron source and oxidant. The effects of Fe3+ concentration on the morphology and adsorption capacity of the Fe3O4/PPy nanotubes were investigated. The Fe3O4/PPy nanotubes exhibit a tubular structure. Fe3O4 nanoparticles are well dispersed among the PPy nanotubes. The Fe3O4/PPy nanotubes exhibit excellent magnetic property, which make them easy to separate from wastewater by magnetic separation. The diameter of the PPy nanotubes decreased with the increase of the Fe3+ concentration. The Fe3O4/PPy nanotubes showed strong adsorption capability for Cr(VI) with the maximum adsorption capacity of about 451.45 mg·g−1, which is significantly higher than bare Fe3O4 nanoparticles. Cr(VI) was adsorbed on Fe3O4/PPy nanotubes by ion exchange and chelation, where Cr(VI) was partially reduced to Cr(III) due to the existence of −NH+ on the Fe3O4/PPy nanotubes. Furthermore, the Fe3O4/PPy nanotubes are recyclable, retaining 90% of the initial removal efficiency after 5 adsorption/desorption cycles.
✓ 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）