Optimization of Mixed-Based Biochar Preparation Process and Adsorption Performance of Lead and Cadmium

Author:

Yuan Xiaoxian1,Wang Qiang2,Wang Zhipu1,Wu Sikai1,Zhai Yawei1,Zhang Haibing1,Zhou Lisong3,Lu Bei1,Chen Kefan1,Wang Xinwei4

Affiliation:

1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China

2. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

3. Karamay Shuntong Environmental Technology Co., Ltd., Karamay 834000, China

4. College of Chemical Engineering and Environment, China University of Petroleum, Beijing 102249, China

Abstract

Irreversible pollution by heavy metals such as lead (Pb) and cadmium (Cd) adversely affects the ecological environment and human health. Due to its high adsorption, microporosity, and specific surface area, biochar possesses excellent potential for use in heavy metal pollution remediation. The preparation of mixed-based biochar from sludge and cotton stalk can solve the problems inherent to pure sludge biochar, such as undeveloped pore structure and a small specific surface area, while resourcefully utilizing both waste biomass types. This study investigated the adsorption capacity for Pb2+ and Cd2+ of mixed-based biochar prepared at different pyrolysis temperatures, different pyrolysis residence times, and different cotton stalks percentages. Response surface experiments revealed the optimum process conditions for preparing mixed-based biochar, which included a pyrolysis temperature of 638 °C, a pyrolysis residence time of 86 min, and an addition ratio of 50% for cotton stalks. The isothermal adsorption experiments revealed that the maximum adsorption capacities of mixed-based biochar for Pb2+ and Cd2+ were 111.11 and 86.21 mg/g, respectively. Our findings suggest the co-pyrolysis of sludge and cotton stalk as a green and sustainable method for safely disposing of Pb and Cd.

Funder

the Natural Science Foundation of Xinjiang Uygur Autonomous Region

the Karamay Innovative Environment Construction Plan Project

the Third Xinjiang Comprehensive Scientific Investigation Project

the Karamay School Enterprise Cooperative School-running Project

Publisher

MDPI AG

Subject

Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment,Geography, Planning and Development,Building and Construction

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