Water is a vital natural source that needs fortification from wastes and pollutants. However, effluent from manufacturing plants is the main noxious cause of dirt, which can abolish the environmental marine structure. It has turned out to be a root cause of water contamination. Organic and inorganic matters in the water are a main problem and reason for water contamination: over fifty thousand tons of organic matters are squared in environmental sewages yearly[1, 2]. Along with organic contaminants, the effluents released from industries contain heavy metals such as lead, copper, cadmium, chromium, and iron in large proportions[3, 4]. Worldwide, the existence of lead (Pb) in marine environments has been a significant environmental issue. It poses a significant danger to human health, living species, and marine habitats because of its non-degradable property and propensity for bio-accumulation in the food chain, potentially impacting the entire environment. Most of these heavy metals are hazardous to the environment and healthiness, for example, lead and cadmium contaminants from the fabric manufacturers cause skin epidemics, deteriorated immune systems, respirational illness, modification of hereditary material, and lung tumor[5–6]. The USEPA has listed lead and cadmium as carcinogenic to humans and is considered to have deleterious effects on health and bone de-mineralization by direct bone injury or renal problems[7–9]. Several approaches for eliminating heavy metals from wastewaters have been established, such as sorption[10], degradation [11], ion exchange[12], oxidation[13], and electrocoagulation[14]. Amongst these existing technologies, the sorption process has been extensively used due to its comfort of usage, low cost, no secondary contaminants, selectivity, specificity, easy mode of operation, simple operation and exhibit a great potential for the elimination, retrieval, and reprocessing of heavy metals from wastewater[15, 16]. Modern methods for water treatment, such as absorption, membranes, it has been observed that isolation, sorption, flocculation, and ion exchange are effective in reducing the concentration of Pb2+. However, each of these systems may be correlated with elevated running costs and/or sludge disposal. Biochar is a by-product that is formed under oxygen-limited conditions by the thermal decay of leftover carbon-rich residuals. For heavy metal remediation, Biochar is a relatively low-cost, renewable, and efficient adsorbent. Compared to traditional commercially manufactured activated charcoal, on the basis of its high practical applicability and its useful physico-chemical properties, with versatile surface area, proven porosity and surface functional groups with a fair ability to absorb different compounds. To that end, various forms of chemical modification, with acid and alkali, are used. In order to improve their appearance, activation, metal salt activation, and nanoparticle charging materials have been developed. A one-pot hydrothermal chemical system was used to synthesize manganese ferrite/biochar composites; these composites also demonstrated good efficiency in heavy metal-contaminated wastewater remediation. While most methods of chemical alteration used to achieve real biochar composite materials are moderately simple and specific, these techniques have various disadvantages, such as high costs, rigid laboratory requirements, and several standards for dangerous chemical use[17–19]. Furthermore, in order to make biochar a suitable material for engineering use, a wider surface area and reduced size of the material must be obtained. Therefore, a renewable, reliable, and low-cost method of producing usable biochar is essential for the realistic removal of heavy metals. For fuel and chemical processing, lignocellulosic biomass is an essential feedstock for thermo-conversion. Moreover, a sustainable and green source of energy is the goods produced from it. Cellulose, hemicellulose, and lignin are the major biomass elements, with cellulose being the most abundant. Therefore, the pyrolysis activity of cellulose is more important in understanding the complex lignocellulosic biomass pyrolytic activity. In this study, heavy metal cations (Pb2+, Cd2+ are introduced to systematically investigate the sorption behavior of biochar derived from rice husk(a source of cellulose) under a wide range of concentrations. The microstructure of the biochar was characterized by TEM and SEM. The sorption properties of the prepared MBC adsorbent towards Pb2+, Cd2+ were elucidated by a batch sorption method. Also, the belongings of contact time, initial metal concentrations, and pH on the sorption performance of Pb2+ by MBC adsorbent were sensibly examined. Due to its high potential for sorption, recyclability, and fast recovery, it could be suggested that Pb2+, Cd2+ should be considered as a suitable candidate to be extracted from wastewater.