Article
Engineering, Environmental
Yuliang Tu, Dongye Zhao, Yanyan Gong, Zhiliang Li, Hong Deng, Xueming Liu
Summary: Soil contamination by heavy metals and metalloids is a significant environmental challenge. This study tested a novel remediation technology using a ternary amending agent to immobilize arsenic and lead in contaminated soil. The results show that the amending agent effectively reduced the leachable concentrations of arsenic and lead in the soil.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Kunyan Qiu, Linlin Zhao, Yongsheng An, Xiaohong Li, Zhijun Zhang
Summary: A mercapto iron complex functionalized nanosilica (RNS-SF) was prepared to improve the stability and immobilization efficiencies in Pb/Cd-contaminated soil. The results showed that RNS-SF had a stable immobilization efficiency for Pb and Cd, reducing environmental risks effectively.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Agronomy
Guodong Yuan, Dongxue Bi, Jing Wei, Liang Xiao
Summary: Soil acidification in the subtropical region reduces soil productivity and increases the bioavailability of heavy metal(loid)s in soil. This study aimed to remediate an acidic soil contaminated by cadmium (Cd) and arsenic (As) using a Ca-humic complex formed from 800 degrees C-calcined oyster shell and leonardite-derived humic substance, for safe vegetable production. Results showed that a 2.0% dose of the complex significantly reduced Cd and As contents in vegetables, reducing the human health risk. The complex also lowered the bio-accessibility of Cd and As in soil, reducing the human health risk from soil ingestion. The use of oyster shell waste to produce Ca-humic complex as a soil amendment has agronomic and environmental benefits.
Article
Agronomy
Ping Liao, Shan Huang, Yongjun Zeng, Hua Shao, Jun Zhang, Kees Jan van Groenigen
Summary: Lime application significantly increases rice yield and soil pH, while reducing Cd concentrations in grains. The effects of lime on rice yield vary depending on soil pH and lime application rates, with higher lime application leading to greater reduction in Cd concentrations. Lime application at rates exceeding 1.0 and 6.0 t ha(-1) can effectively reduce Cd concentrations in grains to meet food safety standards.
Article
Environmental Sciences
Lizhi He, Jun Meng, Yan Wang, Xianjin Tang, Xingmei Liu, Caixian Tang, Lena Q. Ma, Jianming Xu
Summary: The study demonstrated that attapulgite and processed oyster shell powder were cost-effective agents in reducing Cd accumulation in rice grains in a paddy field contaminated by Cd, while the mixed soil conditioner showed less effectiveness.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Environmental Sciences
W. Tefera, W. Seifu, S. Tian
Summary: This study shows that the application of biochar and oyster shells effectively reduces extractable Cd in soil, enhances soil biochemical properties, reduces Cd uptake and accumulation in rice grains, and improves rice crop productivity.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Haodong Zhao, Liyu Du, Yan Wu, Xiaonan Wu, Wei Han
Summary: This study developed a practical scoring method to assess the remedial effectiveness of Cd passivators, analyzing data on metal pollution, soil fertility, cost-effectiveness, and crop profit to provide numerical scores for remedial effectiveness. The study suggested the design of a passivator database structure composed of soil information, remediation effectiveness, and evaluation method, offering more comprehensive information for guiding improved soil remediation and contamination control.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Shaojun Jiang, Tao Chen, Junhao Zhang, Lian Xin Duan, Bo Yan
Summary: This study explores the use of highly active silicon modified tailings (HAST) as sorbents and passivators to address the environmental risks of lead-zinc tailings. The results show that HAST has high stability and adsorption capacity, particularly for Cd ions. The main mechanisms for Cd adsorption onto HAST are ion exchange, complexation, precipitation, and electrostatic interaction. Additionally, HAST can facilitate the conversion of exchangeable Cd fractions into stable fractions in soil. Overall, this study provides a practical strategy for recycling lead-zinc tailings and treating wastewater and soil.
Article
Engineering, Environmental
Weihua Wang, Tao Lu, Lihu Liu, Xiong Yang, Xuecheng Sun, Guohong Qiu, Dangling Hua, Dongmei Zhou
Summary: The study showed that the use of zeolite-supported Mn oxides had a significant impact on reducing Cd accumulation in wheat plants by transforming exchangeable Cd into more stable fractions. The zeolite-supported Mn oxides exhibited high chemical stability and effectively immobilized Cd in alkaline upland soils over two successive years of experiments. These findings suggest great potential for the remediation of Cd-contaminated soils.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Ali El-Naggar, Zhihao Chen, Wenting Jiang, Yanjiang Cai, Scott X. Chang
Summary: This meta-analysis evaluates the effect of biochar application on soil cadmium (Cd) bioavailability using data from 84 peer-reviewed articles. The results show that biochar can reduce Cd bioavailability in contaminated soils, with the greatest reduction in urban/anthropogenically contaminated soils. The effect of biochar varies among soil types, and it is most effective in acidic or coarse- and medium-textured soils, but should be avoided in fine-textured soils.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Environmental Sciences
Haonan Jing, Wentao Yang, Yonglin Chen, Liyu Yang, Hang Zhou, Yang Yang, Zhenjie Zhao, Pan Wu, Muhammad Zia-ur-Rehman
Summary: Cadmium contamination is a severe global agro-environmental issue in rice fields. More research and understanding are needed on the environmental behavior, uptake, and translocation of Cd in soil-rice systems. Environmental factors that affect the bioavailability of Cd and effective remediation strategies should be explored. Scientific planting methods and rice varieties with low Cd accumulation are important measures for ensuring the safety of rice consumption.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Song Gao, Yun Wang, Zhuoqun Wang, Xinyuan Tong, Ruilian Sun
Summary: This study proposed a combination technique of coupled EDTA washing and electrochemical reduction, which can improve the efficiency of Cd and Pb removal from heavy metal-contaminated soil. The research found that increasing the current value and EDTA concentration can enhance the removal efficiency, and pulse current mode is more effective than continuous current.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Xing Yang, Zhinan Dai, Chengjun Ge, Huamei Yu, Nanthi Bolan, Daniel C. W. Tsang, Hocheol Song, Deyi Hou, Sabry M. Shaheen, Hailong Wang, Joerg Rinklebe
Summary: In this study, the effects of functionalized biochars (PBC and FePBC) and different irrigation regimes (CF and IF) on rice yield and the accumulation of As and Pb in rice grain were investigated. The results showed that FePBC increased rice yield under both CF and IF conditions. The concentration of As in grain was higher under CF conditions, whereas the concentration of Pb was higher under IF conditions. Therefore, the application of multiple-functionalized biochar can effectively increase rice yield and reduce As accumulation, particularly under IF conditions, but it is not applicable for Pb remediation in paddy soils.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Feiyue Li, Andrew R. Zimmerman, Yulin Zheng, Yicheng Yang, Jinsheng Huang, Yue Zhang, Xin Hu, Zebin Yu, Jun Huang, Bin Gao
Summary: The study successfully synthesized a novel P-enriched hydrochar using a one-step method, which showed superior Pb stabilization efficacy in contaminated soil compared to pristine hydrochar.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Xing Yang, Ergang Wen, Chengjun Ge, Ali El-Naggar, Huamei Yu, Shengsen Wang, Eilhann E. Kwon, Hocheol Song, Sabry M. Shaheen, Hailong Wang, Joerg Rinklebe
Summary: The use of functionalized biochar amendments can reduce the accumulation of potentially toxic elements (PTEs) in rice grains. Specifically, silicon (Si)-rich and phosphorus (P)-rich biochars can decrease the concentration of arsenic (As) in rice grains, while iron-modified biochars can enhance rice grain yield. Additionally, P-rich biochar can increase the activity of beneficial bacteria in the soil and decrease lead (Pb) concentration in rice grains. However, iron-modified P-rich biochar can increase cadmium (Cd) and Pb concentration in rice grains.
JOURNAL OF HAZARDOUS MATERIALS
(2023)