Article
Engineering, Chemical
Guoping Hu, Yue Wu, Desheng Chen, Yong Wang, Tao Qi, Lina Wang
Summary: Metal ion removal, especially Fe(3+), is crucial for the recovery of nickel and cobalt in the leaching solution of laterite-nickel ores. D2EHPA exhibits high extraction rate and selectivity for Fe(3+), with an extraction efficiency of over 99% under optimized conditions after a three-stage solvent extraction process. Different stripping reagents have varying effects on iron removal, with H(2)C(2)O(4) being the most effective in achieving over 99% iron stripping efficiency under the optimized conditions.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2021)
Article
Environmental Sciences
Meihaguli Ainiwaer, Tuo Zhang, Nan Zhang, Xianxiang Yin, Shiming Su, Yanan Wang, Yang Zhang, Xibai Zeng
Summary: A simple scheme for synthesizing modified nanoscale zero-valent iron (S-nZVI) was established for simultaneous removal of arsenic (As) and cadmium (Cd) from water. Batch experiments showed that S-nZVI had better adsorption capacities for As and Cd compared to other materials, and a possible underlying mechanism was illuminated.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Leonor Zapien Serrano, Noemi Ortiz Lara, Rafael Rios Vera, Diana Cholico-Gonzalez
Summary: The study proposed a combined precipitation-flotation system for the removal of metal ions in acid mine drainage, achieving high removal efficiency. Adjusting pH values, metal ion concentrations, and precipitating agent dosages can achieve efficient removal, while flotation can further remove precipitates.
Article
Engineering, Environmental
Zulqarnain Haider Khan, Zhongyang Li, Minling Gao, Md. Shafiqul Islam, Ling Xiao, Weiwen Qiu, Zhengguo Song
Summary: A novel magnesium-manganese modified biochar composite (Mg/Mn@BC) was prepared for simultaneous elimination of Cd(II) and As(III) from water. The Langmuir sorption capacity of Mg/Mn@BC for As(III) and Cd(II) in the mixed sorption system was 164 and 316 mg g-1, respectively, higher than that in the single adsorption system (75 and 295 mg g-1). The results suggest that Mg/Mn@BC composite has the potential to be used in wastewater treatment.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Weiquan Li, Xueying Lin, Sihao Lv, Weizhao Yin, Zhanqiang Fang, Jingling Huang, Ping Li, Jinhua Wu
Summary: This study investigated the effect of hydrogenotrophic denitrification on cadmium (Cd(II)) removal and column life-span using hydrogen-autotrophic microorganisms and zero-valent iron (Fe-0) filled columns. The results showed that the nitrate-mediated bio-Fe-0 column had a higher Cd(II) removal efficiency and longer service life compared to the bio-Fe-0 and Fe-0 columns. This improvement was attributed to hydrogenotrophic denitrification, which caused more iron corrosion and more secondary mineral generation, providing more reaction sites for Cd(II) adsorption and immobilization. The distribution of reactive zone along the bio-Fe-0 column mediated by nitrate was found to be uneven, with the latter half part identified as a more active region for Cd(II) immobilization.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Chemical
Guiyong Zhou, Ning Wang, Wei Xu, Guotao Hu, Hannian Gu
Summary: In this study, selective sequential extraction and microanalysis methods were used to investigate the distribution and occurrence modes of arsenic in phosphate ore. It was found that arsenic mainly existed in carbonate minerals, oxides/hydroxides, and sulfide minerals fractions, with a small portion in the exchangeable and soluble fraction. Microanalysis revealed that iron oxides/hydroxides, rhodochrosite particles, and pyrite were the main arsenic-containing minerals. These findings provide valuable insights for developing techniques to remove arsenic from phosphate ores.
MINERALS ENGINEERING
(2023)
Article
Metallurgy & Metallurgical Engineering
Chengjin Xu, Ling Li, Miaomiao Zhang, Xiao Meng, Xiujing Peng, Shah Zeb, Yongqiang Lu, Dan Qiao, Yu Cui, Guoxin Sun
Summary: In this study, the selective separation and recovery of iron(III) from phosphate ore leach liquor was achieved using two novel extractants. The results showed that both extractants exhibited good separation ability even at high sulfuric acid concentrations, and oxalic acid was effective in stripping iron(III) from the organic phase.
Article
Chemistry, Analytical
Mor Mbodji, Nadia Baskali-Bouregaa, Frederique Barbier-Bessueille, Linda Ayouni-Derouiche, Cheikh Diop, Mamadou Fall, Nicole Gilon
Summary: This paper investigates heavy metal pollution in agricultural fields near the largest landfill in Senegal by comparing total concentrations and speciation of heavy metals. The majority of heavy metals are bound to the residual fraction, making them less likely to be released into the environment. The metal pollution is more severe in certain sampling sites, and the exchangeable fraction in the soil suggests that some elements may be easily released. Some vegetables analyzed had high concentrations of certain heavy metals, but consuming them does not pose significant health risks except for cassava and cassava leaves.
Article
Engineering, Environmental
Jiajiang Lin, Fengxin He, Gary Owens, Zuliang Chen
Summary: The addition of phytogenic iron oxide nanoparticles reduced the availability of cadmium in flooded soil and decreased its uptake by rice plants. Microbial community shifts were observed with an increase in certain bacteria and a decrease in others after the application of phytogenic iron oxide nanoparticles. Overall, this study provides valuable insights into a potential low-cost remediation strategy for cadmium-contaminated paddy soils.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Biotechnology & Applied Microbiology
Peng Fu, Xin Wang, Jing Shi, Lixiang Zhou, Qingjie Hou, Weiqian Wang, Yu Tian, Junmei Qin, Wenlong Bi, Fenwu Liu
Summary: In this study, a composite Schwertmannite@Biochar (Sch@BC) was synthesized and modified by alkali for the removal of As(III) and Cd(II) from wastewater. The alkali-modified Schwertmannite@Biochar (AM-Sch@BC) showed significantly improved adsorption capacity. Under certain conditions, the removal efficiency of As(III) and Cd(II) increased by 1.1 and 7.5 times, respectively, compared with Sch@BC. AM-Sch@BC could effectively remove As(III) and Cd(II) at pH 6.00-8.00, with a 100% removal efficiency for As(III) within 1 hour and a 70% removal efficiency for Cd(II) after 12 hours. The increased -OH content and specific surface area (SSA) in the adsorbent after alkali modification may contribute to its efficient removal of As(III) and Cd(II).
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Environmental Sciences
Jing Feng, Gang Lang, Tingting Li, Jing Zhang, Tengyue Li, Zhenju Jiang
Summary: In this study, a facile Fe-tannin coating method was developed to enhance the removal of heavy metal ions by zero-valent iron (ZVI). The modified ZVI materials demonstrated excellent performance in removing various heavy metal ions, with improved removal reactivity compared to unmodified ZVI materials. The surface modification also provided advantages in resisting interference and simultaneous removal of different heavy metal ions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Ruosong Xie, Ziying Li, Guangfei Qu, Yingjie Zhang, Chenpeng Wang, Yingda Zeng, Yiting Chen
Summary: This study proposes a new selective and efficient extraction-recovery strategy for Cd purification using C6MimT/[C6Mim]PF6 as a green extractant. The high compatibility between C6MimT and [C6Mim]PF6 enables efficient separation of C6MimT-Cd from the aqueous phase, with an extraction rate of 99.9% at a Cd(II) concentration of 1000 mg/L. The extraction system of C6MimT/[C6Mim]PF6 remains stable after multiple extraction-stripping cycles, overcoming the problems of extractant loss and organic pollution.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2023)
Article
Chemistry, Multidisciplinary
A. B. Abdallah, Ehab A. Abdelrahman, Adel M. Youins, Wesam A. Ibrahim, Magdi E. Khalifa
Summary: Modified aluminum scrap waste was used for the selective extraction of Hg(ii) and Cd(ii) ions. The modified aluminum sorbents exhibited high adsorption capacity and selectivity for the target ions.
Article
Engineering, Chemical
Mohamed M. Elnagar, Mohamed A. Hashem, Mohamed M. Hassanien, Mohamed A. Ismail
Summary: The new green mixed-micelle cloud point extraction method can effectively remove trace iron contaminations from various geological samples to obtain highly-pure metals; based on the ternary complex of Fe(III) with ECR and CTAB, the method achieves a high extraction efficiency of over 98.50% at 35 degrees C using Triton X-114, accompanied by a 100-fold enrichment factor.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Jun Liu, Baihua Chen, Yunnu Liu, Jun Ma, Xingliang Li, Yanqiu Yang
Summary: The article presents a novel tridentate ligand ETPhenAm with selective extraction properties for americium and curium, demonstrating promising experimental results and potential applications.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
